Detection and identification method and device of pass-type detection device, pass-type detection device and security check door

Abstract

The invention provides a detection and identification method and device of a pass-type detection device, the pass-type detection device and a security check door, is applied to the technical field of pass-type detection devices, and aims to solve the problem that the existing pass-type detection device cannot identify the type of a detection object. Acquiring detection signals of each receiving coil of the pass-type detection device in different modes; amplitude data and phase data of the receiving coils in different modes are determined according to the detection signal of each receiving coil; according to the amplitude data and the phase data of each receiving coil in different modes, identifying the type of the detection object; according to the invention, articles carried by people passing through the pass-type detection device can be classified and identified, and the identification accuracy and safety can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pass-through detection devices, and in particular to a detection and identification method and device for a pass-through detection device, a pass-through detection device and a security door. Background Art

[0002] A pass-through detection device is a detection device that detects whether a person is carrying a target object, also known as a pass-through detector (such as a security gate). At present, at the entrances and exits of important places such as subway entrances, airports, stations, prisons, etc. where security checks are required, pass-through detection devices are usually used to detect the objects carried by people passing through. However, currently, pass-through detection devices can only alarm for detected metals and cannot identify the type of objects carried by people passing through.

[0003] In view of this, how to identify the types of items carried by people has become a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide a detection and identification method and device for a pass-through detection device, a pass-through detection device and a security door, which can realize the classification and identification of the detected object during use, thereby improving the identification accuracy and safety.

[0005] To solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0006] On the one hand, a detection and identification method of a pass-through detection device is provided, comprising:

[0007] When the detected object passes through the through-type detection device, the detection signals of each receiving coil of the through-type detection device in different modes are obtained;

[0008] Determine amplitude data and phase data of the receiving coil in different modes according to the detection signal of the receiving coil in different modes;

[0009] The type of the detected object is identified according to the amplitude data and phase data of each receiving coil in different modes.

[0010] On the other hand, a detection and identification device of a pass-through detection device is provided, the detection and identification device comprising:

[0011] An acquisition module, used for acquiring detection signals of each receiving coil of the through-type detection device in different modes when the detected object passes through the through-type detection device;

[0012] A determination module, used to determine the amplitude data and phase data of the receiving coil in different modes according to the detection signal of the receiving coil in different modes;

[0013] The identification module is used to identify the type of the detection object according to the amplitude data and phase data of each receiving coil in different modes.

[0014] On the other hand, a pass-through detection device is provided, the pass-through detection device comprising a memory, a processor, and a plurality of transmitting coils and a plurality of receiving coils arranged on each side door panel of the pass-through detection device, wherein:

[0015] The memory is used to store computer programs;

[0016] The processor is used to implement the steps of the detection and identification method of the pass-through detection device as described above when executing the computer program.

[0017] On the other hand, a security door is provided, the security door comprising a memory, a processor, and a plurality of transmitting coils and a plurality of receiving coils arranged on each side door panel of the pass-through detection device, wherein:

[0018] The memory is used to store computer programs;

[0019] The processor is used to implement the steps of the detection and identification method of the pass-through detection device as described above when executing the computer program.

[0020] The detection and identification method of the pass-through detection device provided in the embodiment of the present invention is that when the detection object passes through the pass-through detection device, each receiving coil generates a corresponding detection signal in different modes, and the corresponding amplitude data and phase data can be obtained according to the detection signal of each receiving coil in different modes. By analyzing the amplitude data and phase data of each receiving coil, the category of the detection object can be identified, thereby realizing the classification and identification of the detection object carried by the person passing through the pass-through detection device, which is beneficial to improving the identification accuracy and safety.

[0021] In addition, the embodiments of the present invention also provide corresponding implementation devices, pass-through detection devices and security gates for the detection and identification method of the pass-through detection device, further making the method more practical, and the devices, pass-through detection devices and security gates have corresponding advantages.

[0022] It is to be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the prior art and the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic flow chart of a detection and identification method of a pass-through detection device provided by an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the distribution of receiving coils on a pass-through detection device provided by an embodiment of the present invention;

[0026] Figure 3 A schematic flow chart of another detection and identification method of a pass-through detection device provided by an embodiment of the present invention;

[0027] Figure 4 A schematic diagram of a process for determining a target receiving coil provided by an embodiment of the present invention;

[0028] Figure 5 A schematic diagram of a flow chart of a through-type detection device for detecting and identifying the type of an object provided by an embodiment of the present invention;

[0029] Figure 6 A schematic diagram of a flow chart of another method of detecting and identifying the type of an object by a through-type detection device provided in an embodiment of the present invention;

[0030] Figure 7 A schematic diagram of a flow chart of identifying the type of an object detected by a pass-through detection device provided in an embodiment of the present invention;

[0031] Figure 8 An amplitude data curve and a phase data curve of a mobile phone without charging function detected by a single receiving coil;

[0032] Fig. 9 A schematic diagram of a calculation flow of a multi-element multi-mode amplitude of a single receiving coil provided in an embodiment of the present invention;

[0033] Fig.10 A schematic diagram of the distribution of adjacent receiving coils of a through-type detection device provided by an embodiment of the present invention;

[0034] Fig.11 A schematic diagram of the distribution of adjacent receiving coils of another through-type detection device provided by an embodiment of the present invention;

[0035] Fig.12 A schematic diagram of a module of a detection and identification device of a pass-through detection device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The embodiments of the present invention provide a detection and identification method and device of a pass-through detection device, a pass-through detection device and a security door, which can realize the classification and identification of objects during use, thereby improving the identification accuracy and safety.

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Please refer to Figure 1 , Figure 1 A flow chart of a detection and identification method of a pass-through detection device provided in an embodiment of the present invention. The detection and identification method of the pass-through detection device can be executed by a main control unit (such as a CPU, a controller, or other chip) inside the pass-through detection device, or by a server (the pass-through detection device and the server can communicate by wire or wirelessly), all of which are included in the protection scope of this application. The detection and identification method includes:

[0039] S110: When the object to be detected passes through the through-type detection device, detection signals of each receiving coil of the through-type detection device in different modes are obtained.

[0040] It should be noted that a transmitting coil and a receiving coil may be installed on the through-type detection device. When no metal object passes through the through-type detection device, after the transmitting coil generates an electromagnetic field, the receiving coil will not generate an induction signal. When a metal object passes through the through-type detection device, the metal object will interfere with the electromagnetic field generated by the transmitting coil, causing the magnetic field to change, and the receiving coil can obtain the detection signal generated by the change in the magnetic field. In order to reduce the detection blind area range of the through-type detection device in the embodiment of the present invention, a multi-mode solution is proposed, that is, the through-type detection device will be in different modes during operation, and each mode may include but is not limited to mode one, mode two and mode three. Different transmitting coils can be used to work in different modes, or the current direction in the transmitting coil is different in different modes. Different modes have their own emphasis (for example, mode one has a good detection effect in the x-axis direction, and mode two has a good detection effect in the y-axis and z-axis directions; or, the detection blind area of ​​mode one and the detection blind area of ​​mode two are located at different positions), so different modes can complement each other, thereby improving the detection effect through multiple modes. The pass-through detection device will cycle through various modes during operation. When the pass-through detection device is in different modes, the detection signal sensed by each receiving coil is also different. Therefore, in order to accurately identify the type of the detected object in the embodiment of the present invention, the detection signal of each receiving coil of the pass-through detection device in different modes can be obtained.

[0041] In practical applications, the through-type detection device can be a security door or other device. In order to reduce the detection blind area of ​​the through-type detection device, multiple groups of transmitting coils and multiple groups of receiving coils can be respectively set on each side door panel of the through-type detection device. For example, two groups of transmitting coils can be set on each side door panel of the through-type detection device, for example, a first transmitting coil and a second transmitting coil are set on each side door panel, that is, a group of first transmitting coils and a second transmitting coil are set on the first side door panel, and a group of first transmitting coils and a second transmitting coil are also set on the second side door panel. And the mode of the through-type detection device can be controlled by controlling the current direction of the two groups of transmitting coils on each side door panel. The magnetic fields generated by the transmitting coils in different modes are also different, so that different modes can complement each other to improve the detection and recognition effect. For example, when the current directions of the first transmitting coils on the two side door panels are opposite, the through-type detection device is in mode one; when the current directions of the first transmitting coils on the two side door panels are the same, the through-type detection device is in mode two; when the current directions of the second transmitting coils on the two side door panels are opposite, the through-type detection device is in mode three. Among them, when the current directions of the corresponding transmitting coils on the door panels on both sides are the same, a superposition field is formed, which can mainly generate magnetic flux lines in the x-axis direction; when the current directions of the corresponding transmitting coils on the door panels on both sides are opposite, a repulsive field is formed, which can mainly generate magnetic flux lines in the y-axis and z-axis directions. In this way, by setting the above three modes, the detection objects passing through in different postures can be detected. Therefore, for each receiving coil, the detection signal in each mode can be obtained respectively. Of course, in practical applications, it is not limited to the above three modes. The specific modes can be determined according to actual needs, and the embodiment of the present invention does not make special limitations on this.

[0042] It is understandable that, since each detection object may enter the through-type detection device in a different posture, in order to ensure that there is a large magnetic flux passing through the detection object, the through-type detection device can be operated in the above three different modes in turn, and the detection signals of each receiving coil of the through-type detection device in different modes are obtained. Among them, the detection signal can be the data directly output by the receiving coil, or it can be the data obtained after the output data of the receiving coil is processed by subsequent related circuits (such as amplification, filtering, etc.).

[0043] S120: Determine amplitude data and phase data of the receiving coil in different modes according to the detection signals of the receiving coil in different modes.

[0044] It should be noted that, in practical applications, each receiving coil on the through-type detection device can be respectively arranged on the door panels on both sides of the through-type detection device. The number of receiving coils on the door panels on both sides is the same. For example, there are 12 receiving coils in total. Then, their distribution is as follows: Figure 2 As shown, Figure 2Coil 1 to coil 12 in the figure are all receiving coils. For each receiving coil, the detection signal of the receiving coil in different modes includes corresponding IQ (In-phase and Quadrature, orthogonal amplitude component) data. The IQ data can be the data obtained after the signal induced by the receiving coil is IQ demodulated by the receiving circuit. Therefore, the amplitude data and phase data can be obtained based on the IQ data.

[0045] For example, according to the detection signal of the receiving coil in mode 1, the amplitude data and phase data of the receiving coil in mode 1 are obtained; according to the detection signal of the receiving coil in mode 2, the amplitude data and phase data of the receiving coil in mode 2 are obtained; according to the detection signal of the receiving coil in mode 3, the amplitude data and phase data of the receiving coil in mode 3 are obtained. Assuming there are 12 receiving coils, the amplitude data and phase data of the 12 receiving coils in each mode are obtained.

[0046] S130: Identify the type of the detected object according to the amplitude data and phase data of each receiving coil in different modes.

[0047] Since the transmitting coil generates a certain electromagnetic field, when the detection object carrying the metal object passes through the through-type detection device, the metal object will generate an eddy current magnetic field in the original electromagnetic field generated by the transmitting coil. The eddy current magnetic field interacts with the original electromagnetic field, and the electromagnetic field changes caused by different types of metal objects are different. Therefore, the receiving coil can detect different magnetic field changes to obtain corresponding detection signals, so that the amplitude data and phase data of each receiving coil in different modes can be obtained according to the detection signal of each receiving coil in different modes. Therefore, the corresponding amplitude data and phase data of different types of detection objects will also be different. After obtaining the amplitude data and phase data of each receiving coil in different modes, the type of the detection object can be further identified according to the amplitude data and phase data of each receiving coil in different modes, thereby determining the type of the detection object.

[0048] It can be seen that in the embodiment of the present invention, when the detected object passes through the pass-through detection device, the corresponding amplitude data and phase data can be obtained according to the detection signals of each receiving coil in different modes, and by further analyzing the amplitude data and phase data of each receiving coil, the category of the detected object can be identified, thereby realizing the classification and identification of the detected object carried by the person passing through the pass-through detection device, which is beneficial to improving the identification accuracy and safety.

[0049] Based on the above embodiments, the technical solution is further explained and optimized as follows:

[0050] In one embodiment, see Figure 3 , Figure 3 A flow chart of another detection and identification method of a pass-through detection device provided by an embodiment of the present invention. The method comprises:

[0051] S210: When the object to be detected passes through the through-type detection device, detection signals of each receiving coil of the through-type detection device in different modes are obtained.

[0052] It should be noted that the implementation process of S210 in the embodiment of the present invention is the same as the implementation process of S110 in the above embodiment, and reference may be made to the relevant introduction in the above embodiment, which will not be described in detail in the embodiment of the present invention.

[0053] S220: Determine amplitude data and phase data of the receiving coil in different modes according to the detection signals of the receiving coil in different modes.

[0054] It should be noted that the detection signal of the receiving coil includes corresponding IQ (In-phase and Quadrature, orthogonal amplitude components) data. Among them, the I value is the projection of the detection signal on the cosine wave of the carrier, which represents the amplitude change of the detection signal in one dimension; the Q value is the projection of the detection signal on the sine wave of the carrier, which represents the amplitude change of the detection signal in another dimension orthogonal to the I component. In the embodiment of the present invention, the corresponding amplitude data and phase data can be obtained according to the IQ data of the receiving coil in different modes. Specifically as follows:

[0055] For each set of IQ data, the inverse tangent function can be used to convert the IQ data into radians, and then the radians can be converted into angles using the radian to angle relationship to obtain the corresponding phase data. That is, the phase data can be obtained according to the following phase calculation relationship:

[0056] ,

[0057] .

[0058] in, Indicates radians, represents the inverse tangent function, Q represents the Q value of the IQ data, I represents the I value of the IQ data, Indicates the phase, Represents the angle-to-arc conversion function.

[0059] For each set of IQ data, the corresponding amplitude data can be calculated according to the Q value and I value in the IQ data. That is, the amplitude data can be obtained by using the following amplitude calculation relationship:

[0060] .

[0061] in, Indicates amplitude.

[0062] S230: Determine a target receiving coil according to the amplitude data of each receiving coil in different modes.

[0063] It should be noted that when the detected object passes through the through-type detection device, in order to accurately identify the type of the detected object, it is possible to determine which receiving coil the detected object is close to based on the amplitude data of each receiving coil in different modes, and use the determined receiving coil that the detected object is close to as the target receiving coil. In one implementation, S230 in the embodiment of the present invention can be implemented in the following manner, for details, please refer to Figure 4 , Figure 4 A schematic diagram of a process for determining a target receiving coil is provided in an embodiment of the present invention. The process includes the following contents from S310 to S330.

[0064] S310: Based on the amplitude data of each receiving coil in all modes, obtain the unit multi-mode amplitude of each receiving coil.

[0065] It should be noted that, for each receiving coil in the embodiment of the present invention, the unit multi-mode amplitude of the receiving coil can be further obtained based on the amplitude data of the receiving coil in all modes, for example, when the modes include mode one, mode two and mode three, based on the amplitude data of the receiving coil in mode one, the amplitude data in mode two and the amplitude data in mode three. For the unit multi-mode amplitude, the unit multi-mode amplitude of the receiving coil closest to the metal detection object is the largest. Therefore, the unit multi-mode amplitude can be used to identify the receiving coil closest to the metal detection object. The following is a detailed description of the process of obtaining the unit multi-mode amplitude of each receiving coil based on the amplitude data of each receiving coil in all modes:

[0066] First, according to the amplitude data of the ith receiving coil in the jth mode, the amplitude average value of the ith receiving coil in the jth mode is calculated, where i∈[1,N], j∈[1,M], N is the total number of receiving coils, M is the total number of modes, and both N and M are integers greater than 1.

[0067] Secondly, the average amplitudes of the i-th receiving coil in the M modes are summed to obtain the unit multi-mode amplitude of the i-th receiving coil.

[0068] It can be understood that, for example, the total number of modes M=3, and the modes are mode 1 M3, mode 2 M4, and mode 3 M5, respectively. Then, the unit multi-mode amplitude in the embodiment of the present invention refers to the sum of the average amplitudes of a single receiving coil in the three modes M3, M4, and M5, respectively, which can be expressed by the formula:

[0069] .

[0070] in, represents the unit multimode amplitude of the i-th receiving coil, represents the average amplitude of the i-th receiving coil in M3 mode, represents the average amplitude of the i-th receiving coil in M4 mode, Represents the average amplitude of the i-th receiving coil in M5 mode.

[0071] The amplitude average value refers to the amplitude value after calculating the average value of all amplitude data of a single receiving coil in the corresponding mode. .For example: , represents the amplitude value after the average value of all amplitude data of the i-th receiving coil in the M3 mode is calculated. Among them, the same receiving coil will have multiple detection signals in one mode, and these detection signals are acquired at different times. For example: in the process of detecting an object passing through a through-type detection device, the through-type detection device will cyclically execute each mode. In this way, for each receiving coil, each mode will have multiple detection signals in the entire detection process.

[0072] For N receiving coils, N unit multi-mode amplitudes can be obtained by the above method. For example, if N=12, coils 1 to 12 are respectively denoted as a1, a2, ... a12, then the unit multi-mode amplitude set of these 12 receiving coils can be obtained:

[0073] [ , ,……, ].

[0074] S320: Determine the maximum unit multi-mode amplitude from the unit multi-mode amplitudes of all receiving coils.

[0075] S330: Use the receiving coil corresponding to the largest unit multi-mode amplitude as the target receiving coil.

[0076] For example: Assume the unit multimode amplitude of coil 2, that is The maximum unit multi-mode amplitude is used as the target receiving coil. It should be noted that the unit multi-mode amplitude in the embodiment of the present invention can be used to indicate the degree of proximity of the detected object to the receiving coil. The larger the value of the unit multi-mode amplitude is, the closer the detected object is to the receiving coil. Therefore, the maximum unit multi-mode amplitude can be determined from the unit multi-mode amplitudes of all receiving coils, and the receiving coil corresponding to the maximum unit multi-mode amplitude is used as the target receiving coil. Since the detected object is closest to the area where the target receiving coil is located when passing through the through-type detection device, the detection signal obtained by the target receiving coil can most accurately reflect the characteristics of the detected object, so that the type of detected object can be accurately identified based on the amplitude data and / or phase data of the target receiving coil in different modes.

[0077] S240: Identify the type of the detected object according to the amplitude data and / or phase data of the target receiving coil in different modes.

[0078] It is understandable that after determining the target receiving coil that the detected object is close to, the type of the detected object can be identified based on the amplitude data and / or phase data of the target receiving coil in different modes. Among them, since the detection signal of the target receiving coil that the detected object is close to can more accurately reflect the situation of the detected object, the embodiment of the present invention uses the amplitude data and / or phase data of the target receiving coil that the detected object is close to in each mode to identify the type of the detected object, which can improve the accuracy of type identification.

[0079] It should be noted that, since different types of metal objects will have different degrees of influence on the electromagnetic field of the transmitting coil when passing through the pass-through detection device, the receiving coil will detect detection signals of different changes. Therefore, for different types of metal objects, the process of identifying the type of the detection object is different. The following embodiments of the present invention will respectively describe in detail the identification process of different types of metal objects:

[0080] In one embodiment, see Figure 5 For the first type of metal object, the process of identifying the type of the detected object according to the amplitude data and / or phase data of the target receiving coil in different modes in the above S240 may include the following contents from S410 to S420.

[0081] S410: Obtaining a unit multi-mode amplitude of the target receiving coil based on the amplitude data of the target receiving coil in all modes.

[0082] It should be noted that, for each mode, all amplitude data of the target receiving coil in the mode are calculated to obtain the amplitude average of the target receiving coil in the mode, so that the amplitude average of each mode of the target receiving coil can be obtained. Then, the amplitude averages of each mode of the target receiving coil are added together to obtain the unit multi-mode amplitude of the target receiving coil. The implementation process of the unit multi-mode amplitude in the embodiment of the present invention can refer to the implementation process of S310 in the above embodiment, and the embodiment of the present invention will not be repeated here.

[0083] S420: Identify whether the type of the detected object is a first type of metal object according to the unit multi-mode amplitude of the target receiving coil and the corresponding unit multi-mode amplitude threshold.

[0084] In practical applications, the corresponding unit multi-mode amplitude threshold can be set in advance for the first type of metal object, or the unit multi-mode amplitude threshold can be updated in real time. For example, if the unit multi-mode amplitude threshold includes a third unit multi-mode amplitude threshold, then the type of the detected object can be further determined to be the first type of metal object according to the unit multi-mode amplitude of the target receiving coil and the third unit multi-mode amplitude threshold. Specifically, the unit multi-mode amplitude of the target receiving coil can be compared with the third unit multi-mode amplitude threshold. When the unit multi-mode amplitude of the target receiving coil is greater than or equal to the third unit multi-mode amplitude threshold, the type of the detected object is determined to be the first type of metal object. If it is the first type of metal object, a first alarm message can be issued. In practical applications, the first type of metal object in the embodiment of the present invention can be an object with a metal material, for example, including life-type metals (i.e., metals with a small volume, keys, watches, belt buckles, etc.), mobile electronic devices (such as mobile phones), and contraband (such as metal knives). In this embodiment, since the first type of metal objects all have metal characteristics and metals will have an impact on the receiving coil, it is only necessary to determine the degree of impact of the detected object on the receiving coil to identify the first type of metal object. In this embodiment, since the unit multi-mode amplitude can directly reflect the influence of the detection object on the target receiving coil, the first type of metal object can be identified only based on the unit multi-mode amplitude, thereby improving the identification speed.

[0085] In one embodiment, see Figure 6 In practical applications, for other metal types (such as second-type metal objects and third-type metal objects), the process of identifying the type of the detected object in the above S240 according to the amplitude data and / or phase data of the target receiving coil in different modes may include the following contents of S510 to S530.

[0086] S510: Obtain the single-mode multiplication mode coefficient corresponding to the amplitude data of the target receiving coil in each mode.

[0087] It should be noted that, in the embodiment of the present invention, the single-mode multiplication mode coefficient of each mode of the target receiving coil can be obtained according to the amplitude data of the target receiving coil in each mode. Among them, the single-mode multiplication mode coefficients in different modes can reflect the amplitude response of the target receiving coil in the corresponding mode. If the magnetic field directions of different modes are different, when the detected object passes in the same posture, the amplitude response of the receiving coil in different modes will be different. For example: if the magnetic field of mode one is horizontal and the magnetic field of mode two is vertical, if the detected object is a mobile phone, when the mobile phone passes with the display screen parallel to the ground, the amplitude response of the receiving coil in mode one is lower, while the amplitude response of the receiving coil in mode two is higher. Therefore, the single-mode multiplication mode coefficient can be used to determine in which mode the detected object has the greatest impact on the target receiving coil.

[0088] In one embodiment, the process of obtaining the single-mode multiplication mode coefficient corresponding to the amplitude data of the target receiving coil in each mode in S510 may include:

[0089] The amplitude data of the target receiving coil in the jth mode is corrected by using the mode coefficient of the target receiving coil in the jth mode to obtain the single-mode multiplication mode coefficient of the target receiving coil in the jth mode. The mode coefficient is used to reflect the proportional relationship between the detection signals of the receiving coil in different modes, j∈[1,M], M is the total number of modes, and M is an integer greater than 1.

[0090] In other words, each receiving coil has a corresponding mode coefficient in each mode. Figure 2 As shown, in the receiving coil Figure 2 In the case where the receiving coils are distributed on the door panels on both sides of the pass-through detection device in the manner shown, the number of receiving coils on each door panel is the same. In addition, the heights of the two receiving coils at the relative positions of the door panels on both sides are the same, and the mode coefficients of the two receiving coils with the same heights are the same, such as the mode coefficients of coil 1 and coil 2 are the same. Among them, the mode coefficient of the receiving coil is a coefficient that is pre-normalized to a similar value by normalizing the amplitude data of the receiving coil in different modes to reduce the difference in amplitude response of the same detection object in different modes of the same receiving coil. That is, the mode coefficient can be used to reflect the proportional relationship between the detection signals of the receiving coils in different modes.

[0091] One method of obtaining the mode coefficient is, for example, to pass the test sample (such as an aluminum ball) through a through-type detection device at different heights in advance, and obtain the amplitude data of each receiving coil in different modes, and then calculate the mode coefficient based on the acquired amplitude data. In this way, each time the test sample passes through the through-type detection device at a height, the mode coefficient of the receiving coil at the height in each mode can be calculated based on the collected amplitude data. When calculating the mode coefficient, in different modes, it can be calculated based on the detection signals of all receiving coils in the mode and the detection signals of all receiving coils in the reference mode. Among them, the reference mode can be one of the modes. Specifically, when calculating the mode coefficient of each mode of each receiving coil, the amplitude data of all receiving coils are summed when the test sample passes through the corresponding area of ​​the receiving coil in the mode to obtain the sum of the first amplitude. In the reference mode, the amplitude data of all receiving coils are summed when the test sample passes through the corresponding area of ​​the receiving coil to obtain the sum of the reference amplitude. The ratio of the sum of the reference amplitude to the sum of the first amplitude is used as the mode coefficient corresponding to the receiving coil in the mode, so that the mode coefficient corresponding to the receiving coil in each mode can be obtained.

[0092] Next, an example is given: Assume that there are three modes M3, M4, and M5, and mode M5 is used as the reference mode. If the mode coefficients of coil 1 and coil 2 in mode M3 are to be calculated, when the test sample passes through the area corresponding to the height of coil 1 and coil 2, the amplitude data obtained by all receiving coils in each mode during this process are obtained. The sum of the amplitude data of all receiving coils under mode M3 (recorded as sum1) and the sum of the amplitude data of all receiving coils under mode M5 (recorded as sum2) are calculated, and the mode coefficients of coil 1 and coil 2 under mode M3 are sum2 / sum1. Specifically, in an embodiment of the present invention, after determining the target receiving coil, the mode coefficient of the target receiving coil in the jth mode can be obtained for the jth mode, and the mode coefficient of the target receiving coil in the jth mode can be used to correct the amplitude data of the target receiving coil in the jth mode. Specifically, the amplitude average value of the target receiving coil in the jth mode can be corrected (for example, the amplitude average value of the target receiving coil j mode is multiplied by the mode coefficient of the target receiving coil j mode), and the single-mode multiplication mode coefficient of the target receiving coil in the jth mode is obtained. The calculation relationship of the single-mode multiplication coefficient is, for example:

[0093] .

[0094] in, represents the single-mode multiplication coefficient of the target receiving coil y in the xth mode, represents the average amplitude of the target receiving coil y in the xth mode, represents the mode coefficient of the target receiving coil y in the xth mode. For example, when the target receiving coil y is coil 1, the single-mode multiplication mode coefficient of coil 1 in mode M3 is:

[0095] .

[0096] represents the single-mode multiplication coefficient of coil 1 in mode M3, represents the average amplitude of coil 1 in mode M3, It represents the mode coefficient of the receiving coil 1 in the mode M3.

[0097] For the target receiving coil y, the set of single-mode multiplication mode coefficients corresponding to each mode (M3, M4 and M5) is as follows:

[0098] [ , , ].

[0099] S520: Determine a target mode from all modes according to the single-mode multiplication mode coefficient.

[0100] It is understandable that, due to the different postures of the detected object, the amplitude response of the receiving coil in different modes may also be different. The larger the amplitude value of the receiving coil, the larger the amplitude response, and the more accurately the phase data can reflect the characteristics of the detected object. Therefore, in order to determine more accurate phase data in the embodiment of the present invention, the target mode can be determined from each mode according to the single-mode multiplication mode coefficient of the target receiving coil in each mode, so that the type of the detected object can be identified according to the amplitude data of the target receiving coil in all modes and the phase data in the target mode.

[0101] Specifically, in the process of determining the target mode from all modes, the largest single-mode multiplication mode coefficient can be determined from the single-mode multiplication mode coefficients corresponding to the M different modes. The mode corresponding to the largest single-mode multiplication mode coefficient is used as the target mode. For example, assuming that the target receiving coil is coil 3, and in the single-mode multiplication mode coefficients corresponding to each mode (M3, M4 and M5) of coil 3, if the unit single-mode multiplication mode coefficient amplitude of coil 3 under mode M3 is The value of is the largest, then mode M3 is used as the target mode.

[0102] S530: Identify the type of the detected object according to the amplitude data of the target receiving coil in all modes and the phase data of the target receiving coil in the target mode.

[0103] It should be noted that, since the amplitude data can reflect the response strength of the receiving coil when the detection object passes, and the phase data can reflect the material of the detection object, this embodiment uses the amplitude data and the phase data to further identify the type of the detection object. After determining the target receiving coil and the target mode, since the phase value in the target mode is more accurate, the type of the detection object can be identified in combination with the phase data of the target receiving coil in the target mode, so as to more accurately identify the type of the detection object.

[0104] In one embodiment, see Figure 7 , Figure 7 The present invention provides a schematic diagram of a specific implementation process of identifying the type of a detected object based on the amplitude data of a target receiving coil and the phase data in a target mode. The implementation process of the above S530 may include the following contents of S610 to S640.

[0105] S610: Obtaining a phase average value and a phase slope average value corresponding to the phase data of the target receiving coil in the target mode.

[0106] It should be noted that the phase average value refers to the average value of all phase data of a single receiving coil in each mode, which is recorded as The phase average value can reflect the material of the detected object. The phase average values ​​of detected objects of different materials are different. For example, the phase average values ​​of mobile phones and metal knives are different. The phase slope average value refers to the average value of the phase slope set of a single receiving coil in each mode, which is recorded as The average phase slope sample can reflect the material of the detected object, and because it can also reflect the law of phase change, it can further distinguish two detected objects with similar phases. For example, the phases of a mobile phone equipped with magnetic accessories and an iron knife are relatively close, but the phase slopes of the two are different, so the two detected objects can be distinguished by the phase slope.

[0107] Please refer to Figure 8 The phase data curve of a receiving coil in a mode shown provides a method for calculating the average phase slope. Figure 8Curve A in the figure is the phase data curve, and curve B is the amplitude data curve. The horizontal axis represents the acquired frames, ranging from 0 to 8, and the vertical axis represents the amplitude value and phase value respectively. In each mode, each receiving coil continuously receives the detection signal. Since the relative position relationship and distance between the detection object of the through-type detection device and each receiving coil change, the phase values ​​of the detection signals of the acquisition frames corresponding to different times will be different. The phase slope is equal to the phase value corresponding to the next acquired frame minus the absolute value of the phase value corresponding to the current acquired frame (because the horizontal axis corresponding to the phase value corresponding to the next acquired frame and the phase value corresponding to the previous acquired frame differ by 1, it can be ignored). The calculation formula for the phase slope is as follows:

[0108] .

[0109] in, represents the phase slope of the nth frame acquired, Indicates the phase value of the acquired n+1th frame, Indicates the phase value of the nth frame collected, represents the absolute value function.

[0110] It can be understood that after calculating the phase slopes of every two adjacent frames, the phase slopes of each frame are averaged to obtain the average phase slope value. Figure 8 The phase data curve shown in FIG. 8 can be used to calculate 8 phase slopes by this method, and then the 8 phase slopes are averaged to obtain the phase slope average value.

[0111] S620: Obtaining a unit multi-mode amplitude of the target receiving coil based on the amplitude data of the target receiving coil in all modes.

[0112] It should be noted that the implementation process of S620 in the embodiment of the present invention is the same as the implementation process of S410 in the above embodiment, and reference may be made to the relevant introduction in the above embodiment, which will not be described in detail in the embodiment of the present invention.

[0113] S630: Obtain the amplitude average corresponding to the amplitude data of the target receiving coil and other receiving coils in the set area in all modes, and obtain the multivariate multi-mode amplitude of the target receiving coil according to the amplitude average of the target receiving coil and other receiving coils in the set area.

[0114] It should be noted that the multivariate multimode amplitude is used to reflect the degree of influence of the detected object on multiple receiving coils, and can reflect the volume of the detected object. The set area is determined based on the location of the target receiving coil, for example, the area near the target receiving coil, that is, the multivariate multimode amplitude is obtained based on the amplitude data of the target receiving coil and its adjacent receiving coils. In one embodiment, the process of obtaining the multivariate multimode amplitude of the target receiving coil based on the amplitude average of the target receiving coil and other receiving coils in the set area in S630 above may include:

[0115] First, the multivariate and multimode amplitudes of the target receiving coil and the other receiving coils in the set area are determined according to the average amplitudes of the target receiving coil and the other receiving coils in the set area.

[0116] Secondly, the maximum multi-multi-mode amplitude is determined from the multi-multi-mode amplitudes of the target receiving coil and other receiving coils in the set area.

[0117] Finally, the maximum multivariate multimode amplitude is taken as the multivariate multimode amplitude of the target receiving coil.

[0118] It should be noted that when the detection object is in a z-axis posture (for example, the detection object is a mobile phone, and the z-axis posture is that the mobile phone passes with the screen parallel to the horizontal direction), in the corresponding mode (for example, the current directions of the corresponding transmitting coils on the door panels on both sides are opposite), magnetic flux lines in the z-axis direction will be generated, and the magnetic flux of the magnetic flux lines in the z-axis direction passing through the detection object is the largest, and the amplitude response received by the receiving coil is also the largest. In this case, among all the receiving coils in the set area, the largest unit multi-mode amplitude and the largest multi-multi-mode amplitude may not be the same receiving coil (for example, the target receiving coil), which may cause the possibility of missed reports. In order to overcome this problem, in this embodiment, for the target receiving coil, several receiving coils adjacent to the target receiving coil can be determined according to the position of the target receiving coil, and then the multi-multi-mode amplitude of the target receiving coil and the multi-multi-mode amplitude of each adjacent receiving coil are calculated, and the largest multi-multi-mode amplitude is found from these multi-multi-mode amplitudes as the final multi-multi-mode amplitude of the target receiving coil. In this way, even if the detected object is in the z-axis posture, it can ensure that the target receiving coil has the maximum unit multi-mode amplitude and the multi-element multi-mode amplitude at the same time, avoiding the multi-element multi-mode amplitude corresponding to the target receiving coil not being the maximum and not meeting the threshold, resulting in the omission of, for example, the second and third category metal objects.

[0119] In one embodiment, the calculation process of the multivariate multimode amplitude of each receiving coil (which may be a target receiving coil or other receiving coil) in the above embodiment can refer to Fig. 9 , including the following contents of S710 to S750.

[0120] S710: Obtain the coil coefficient corresponding to the receiving coil and the mode coefficient of the receiving coil in each mode. The coil coefficient is used to reflect the proportional relationship between the detection signals of the receiving coils at different positions, and the mode coefficient is used to reflect the proportional relationship between the detection signals of the receiving coils in different modes.

[0121] It should be noted that each receiving coil has a coil coefficient corresponding to it. Among them, the coil coefficient can be used to reflect the proportional relationship between the detection signals of the receiving coils at different positions when the same detection object passes through, and is a coefficient that reduces the difference in the amplitude response of the detection object to different receiving coils. The coil coefficient can also be pre-measured by using test samples (such as aluminum balls) to pass through the through-type detection device at different heights, and collect the amplitude data of each receiving coil, and then align the amplitude corresponding to each receiving coil to the receiving coil with the highest amplitude. A coefficient table is obtained by calculation, and the coefficient table includes the coil coefficients corresponding to each receiving coil, wherein the receiving coils at the same horizontal position can share a coil coefficient, that is, the coil coefficients of two receiving coils (such as coil 1 and coil 2) at the same height on the door panels on both sides are the same. Specifically, when calculating the coil coefficient of each receiving coil, the test sample is passed through the through-type detection device at different heights, and the amplitude data of all receiving coils when the test sample passes through the through-type detection device each time are recorded, and summed, which is recorded as the sum of the amplitude data. Next, the maximum value of the sum of all the amplitude data is screened out. Thus, the coil coefficient of each receiving coil is the ratio of the sum of the amplitude data when the test sample passes through the height at which the receiving coil is located to the maximum value.

[0122] Next, an example is given: As an example, Figure 2 For example, if you want to calculate the coil coefficients of coil 1 and coil 2, you can select a mode (such as the above-mentioned mode M5) as the test mode. First, count the amplitude data of all receiving coils in each passing process when the test sample passes through 6 areas of different heights in the test mode. For example, when passing through the first height area (that is, the area between coil 1 and coil 2), sum the amplitude data of all receiving coils, and the sum of the amplitude data is sum1. The other 5 height areas are calculated in the same way to obtain sum2, sum3, sum4, sum5, and sum6, so as to obtain the sum of the 6 amplitude data from sum1 to sum6. Next, find the maximum value (recorded as max1) from sum1, ..., sum6. In this way, the coil coefficients of coil 1 and coil 2 are both sum1 / max1. The coil coefficients of other coils are calculated according to the same principle.

[0123] In addition, for the introduction of mode coefficients, please refer to the above Figure 6The corresponding embodiment part of the present invention will not be described in detail here.

[0124] S720: Determine one or more adjacent receiving coils corresponding to the receiving coil according to the position of the receiving coil.

[0125] It should be noted that, in the embodiment of the present invention, for each receiving coil, at least one adjacent receiving coil adjacent to the receiving coil can be determined according to the position of the receiving coil, wherein the area where the adjacent receiving coil is located is the set area. In practical applications, two receiving coils located above the current receiving coil, two receiving coils located below the current receiving coil, and a receiving coil at the same height as the current receiving coil on the door panels on both sides can be used as adjacent receiving coils of the current receiving coil.

[0126] Specific as Fig.10 and Fig.11 As shown, for example, for coil 1, since there is no adjacent receiving coil above coil 1, the receiving coils adjacent to coil 1 include, for example, coil 2, coil 3, and coil 4 (since coil 5 and coil 6 are far away from coil 1, the data of these two receiving coils are less meaningful, so coils 5 and 6 are not selected as adjacent receiving coils). For coil 2, its adjacent receiving coils include, for example, coil 1, coil 3, and coil 4. For coil 3, its adjacent receiving coils include, for example, coil 1, coil 2, coil 4, coil 5, and coil 6. As shown Fig.11 As shown, for the middle coils 3 to 10, each receiving coil may correspond to 5 adjacent receiving coils. Fig.10 As shown, for the receiving coils at both ends, such as coil 1, coil 2, coil 11, and coil 12, there may be three corresponding adjacent receiving coils. Therefore, in the embodiment of the present invention, the adjacent receiving coils corresponding to the receiving coils may be determined according to the positions of the receiving coils.

[0127] S730: Calculate the amplitude average value of the receiving coil in the jth mode and the sum of the amplitude average values ​​of each adjacent receiving coil of the receiving coil in the jth mode to obtain the cumulative amplitude of the receiving coil in the jth mode.

[0128] It should be noted that when the type of detected object is identified based on the amplitude value of a single receiving coil, it is not possible to distinguish between daily life metals and mobile devices (such as mobile phones) and contraband. Since the volume of daily life metals is small, while the volume of mobile devices and contraband is usually large, the larger the volume of the metal, the stronger the response of the receiving coil. Therefore, when daily life metals are placed at a position close to the door panel and the mobile devices and contraband are placed in the middle between the two door panels, the amplitude value of a single receiving coil is similar. Therefore, it is necessary to combine the amplitude and the volume of the detected object to identify the type of detected object. Among them, the volume of the detected object can be identified by the cumulative amplitude. It can be understood that for the receiving coil, the amplitude average value of the receiving coil in the jth mode and the amplitude average value of each adjacent receiving coil in the jth mode can be summed to obtain the cumulative amplitude of the receiving coil in the jth mode. For example, mode mx can be one of M3, M4 and M5. For coil 1, its adjacent receiving coils are coil 2, coil 3 and coil 4, then the cumulative amplitude of coil 1 in mode x is:

[0129] .

[0130] in, Indicates the accumulated amplitude of coil 1 in mode mx, represents the average amplitude of coil 1 in mode mx, represents the average amplitude of coil 2 in mode mx, represents the average amplitude of coil 3 in mode mx, represents the average amplitude of coil 4 in mode mx. For coil 3, its adjacent receiving coils are coil 1, coil 2, coil 4, coil 5 and coil 6. Let coil 1 to coil 6 be denoted as a1, a2, ... a6 respectively, then the cumulative amplitude of coil 3 in mode mx is:

[0131] .

[0132] in, represents the accumulated amplitude of coil 3 in mode mx, represents the average amplitude of coil 5 in mode mx, represents the average amplitude of coil 6 in mode mx. mx represents the corresponding mode.

[0133] Each other receiving coil can calculate based on this process and obtain the corresponding cumulative amplitude in each mode. Since the cumulative amplitude is related to the amplitude response of multiple adjacent receiving coils, it can reflect the size of the detected object.

[0134] S740: Calculate the product of the coil coefficient of the receiving coil, the mode coefficient of the receiving coil in the jth mode, and the accumulated amplitude of the receiving coil in the jth mode to obtain the multivariate single-mode amplitude of the receiving coil in the jth mode.

[0135] It should be noted that after obtaining the cumulative amplitude of the receiving coil in each mode, for any mode j, the coil coefficient of the receiving coil and the mode coefficient in the jth mode can be used to correct the cumulative amplitude of the receiving coil in the jth mode to obtain the multivariate single-mode amplitude of the receiving coil in the jth mode. Specifically, the coil coefficient of the receiving coil, the mode coefficient in the jth mode, and the cumulative amplitude of the receiving coil in the jth mode can be multiplied, and the product can be used as the multivariate single-mode amplitude of the receiving coil in the jth mode.

[0136] For example, for mode mx, the multivariate single-mode amplitude of the receiving coil ay (can be any receiving coil) can be obtained based on the following multivariate single-mode amplitude calculation relationship:

[0137] .

[0138] in, represents the multivariate single-mode amplitude of the receiving coil ay in mode mx, It represents the cumulative amplitude of the receiving coil ay in mode mx, represents the mode coefficient of the receiving coil ay in mode mx, Indicates the coil coefficient of the receiving coil ay.

[0139] S750: Add the multivariate single-mode amplitudes of the receiving coil in all modes to obtain the multivariate multi-mode amplitude of the receiving coil.

[0140] It should be noted that the multivariate single-mode amplitude of the receiving coil in each mode can be obtained through the above process. For example, the multivariate single-mode amplitude of the receiving coil ay in mode M3 is , the multivariate single-mode amplitude of the receiving coil ay in mode M4 is , the multivariate single-mode amplitude of the receiving coil ay in mode M5 is , the multivariate single-mode amplitudes in each mode can be added together to obtain the multivariate multi-mode amplitude of the receiving coil , the calculation relationship is as follows:

[0141] .

[0142] It can be understood that the above S710 to S750 introduce the multivariate multimode amplitude calculation process of any receiving coil. In practical applications, the target receiving coil can be determined and the multivariate multimode amplitude of the target receiving coil can be calculated in the above manner.

[0143] In order to further improve the recognition accuracy in the embodiment of the present invention, the multivariate multimode amplitudes corresponding to each adjacent target receiving coil corresponding to the target receiving coil can be further calculated, and the largest multivariate multimode amplitude can be selected from the multivariate multimode amplitude of the target receiving coil and the multivariate multimode amplitudes corresponding to each adjacent target receiving coil as the final multivariate multimode amplitude of the target receiving coil for subsequent identification of the type of detected object.

[0144] S640: Identify the type of the detected object based on the comparison result between the unit multi-mode amplitude threshold and the unit multi-mode amplitude of the target receiving coil, the comparison result between the multi-element multi-mode amplitude threshold and the multi-element multi-mode amplitude of the target receiving coil, the comparison result between the phase average value benchmark and the phase average value of the target receiving coil in the target mode, and the comparison result between the phase slope average value benchmark and the phase slope average value of the target receiving coil in the target mode.

[0145] It should be noted that the unit multimode amplitude threshold, the multivariate multimode amplitude threshold, the phase average value reference and the phase slope average value reference can be preset or received in real time. In this embodiment, the unit multimode amplitude is compared with the unit multimode amplitude threshold, and the comparison result of the unit multimode amplitude threshold and the unit multimode amplitude is obtained. The multivariate multimode amplitude threshold is compared with the multivariate multimode amplitude to obtain the comparison result of the multivariate multimode amplitude threshold and the multivariate multimode amplitude. The phase average value reference is compared with the phase average value to obtain the comparison result of the phase average value reference and the phase average value. The phase slope average value reference is compared with the phase slope average value to obtain the comparison result of the phase slope average value reference and the phase slope average value. Finally, the type of the detection object is identified based on each comparison result to obtain the type of the detection object. Among them, the unit multimode amplitude can reflect the response strength of the receiving coil, the multivariate multimode amplitude can reflect the size of the detection object, the phase average value can reflect the material of the detection object according to the size of the phase, and the phase slope average value can further distinguish the material of the detection object according to the phase change. Since the above parameters can reflect the characteristics of different dimensions of the detection object, a more accurate recognition effect can be achieved by comprehensively using the above parameters to identify the category of the detection object.

[0146] In practical applications, different types of metals correspond to different unit multi-mode amplitude thresholds, multi-element multi-mode amplitude thresholds, phase average benchmarks, and phase slope average benchmarks. Therefore, for different types of metals, corresponding benchmarks can be obtained for comparative analysis to further identify whether the detected object is the corresponding metal type.

[0147] The following is an introduction to the identification process of the second and third category metal objects:

[0148] In one embodiment, the unit multimode amplitude threshold in the above S640 includes a first unit multimode amplitude threshold, the multivariate multimode amplitude threshold includes a first multivariate multimode amplitude threshold, the phase average value reference includes a first phase average value reference, and the phase slope average value reference includes a first phase slope average value reference.

[0149] Accordingly, the above S640 may include:

[0150] When the unit multi-mode amplitude of the target receiving coil is greater than or equal to the first unit multi-mode amplitude threshold, and the multi-component multi-mode amplitude of the target receiving coil is greater than or equal to the first multi-component multi-mode amplitude threshold, if the phase average value of the target receiving coil in the target mode satisfies the first phase average value criterion, and the phase slope average value of the target receiving coil in the target mode satisfies the first phase slope average value criterion, the type of the detected object is determined to be a second-class metal object.

[0151] It should be noted that the first unit multimode amplitude threshold, the first multi-element multimode amplitude threshold, the first phase average value reference and the first phase slope average value reference for the second type of metal object can be pre-set, or these thresholds and references can be updated in real time. When performing detection, according to the above corresponding embodiments, after obtaining the unit multimode amplitude, multi-element multimode amplitude of the target receiving coil, and the phase average value and phase slope average value corresponding to the phase data of the target receiving coil in the target mode, the amplitude response is first judged, that is, firstly judged whether the detected object is a metal object. If it is judged that the unit multimode amplitude of the target receiving coil is greater than or equal to the first unit multimode amplitude threshold and the multi-element multimode amplitude of the target receiving coil is greater than or equal to the first multi-element multimode amplitude threshold, the phase response is further judged, that is, the category of the detected object is further confirmed. If it is judged that the phase average value of the target receiving coil in the target mode meets the first phase average value reference, and the phase slope average value of the target receiving coil in the target mode meets the first phase slope average value reference, it can be determined that the type of the detected object is a second type of metal object. Among them, if the result of the amplitude response judgment does not meet the above standards (that is, one of the unit multi-mode amplitude and the multi-element multi-mode amplitude of the target receiving coil does not reach the corresponding threshold), it can be considered that it is not a second-class metal object, and there is no need to judge the phase response.

[0152] As an embodiment, satisfying the first phase average value criterion, for example, is within a set numerical range. For example, if the phase average value of the target receiving coil in the target mode is greater than or equal to the first phase threshold, and less than or equal to the second phase threshold, the phase average value of the target receiving coil in the target mode is deemed to satisfy the first phase average value criterion. Satisfying the first phase slope average value criterion may also be within a set numerical range, for example, less than the first phase slope threshold, in which case the phase slope average value of the target receiving coil in the target mode is deemed to satisfy the first phase slope average value criterion.

[0153] In practical applications, the volume of the second type of metal object is larger than that of the life-type metal, and the amplitude of the detection signal is higher than that of the life-type metal. In addition, the second type of metal object has a metal material, for example, it can be a mobile electronic device with a shell material similar to that of a mobile phone shell, including a mobile phone, a tablet computer, a laptop computer, a power bank, etc. For a mobile phone, it has a certain volume. When making an amplitude response judgment, if only the unit multi-mode amplitude is judged, the life-type metal may be misreported as a mobile phone (that is, if the life-type metal is closer to one side of the door panel, its unit multi-mode amplitude value will be the same as the unit multi-mode amplitude value of the middle area of ​​the detection device when the mobile phone is placed through). Therefore, this embodiment also judges the multi-element multi-mode amplitude to make a comprehensive judgment in combination with the volume size (for example, even if the unit multi-mode amplitude meets the threshold, but the multi-element multi-mode amplitude does not reach the threshold, it means that the detected object may be a life-type metal and is closer to the door panel). In addition, for phase response judgment, if only the phase value is judged, contraband (such as iron-based detection objects) may be mistakenly reported as mobile phones (because the phases of the two are relatively close). However, since the phase slopes of the two are different, the phase slope is also judged at the same time in this embodiment to avoid misreporting contraband as mobile phones, thereby improving the accuracy of mobile phone detection and reducing the false alarm rate.

[0154] In one embodiment, the unit multimode amplitude threshold in the above S640 includes a second unit multimode amplitude threshold, the multivariate multimode amplitude threshold includes a second multivariate multimode amplitude threshold, the phase average value reference includes a second phase average value reference, and the phase slope average value reference includes a second phase slope average value reference.

[0155] Then, the above S640 may further include:

[0156] When the unit multi-mode amplitude of the target receiving coil is greater than or equal to the second unit multi-mode amplitude threshold, and the multi-component multi-mode amplitude of the target receiving coil is greater than or equal to the second multi-component multi-mode amplitude threshold, if the phase average value of the target receiving coil in the target mode satisfies the second phase average value criterion, or the phase slope average value of the target receiving coil in the target mode satisfies the second phase slope average value criterion, the type of the detected object is determined to be a third-category metal object.

[0157] It should be noted that the second unit multimode amplitude threshold, the second multi-element multimode amplitude threshold, the second phase average value reference and the second phase slope average value reference for the third type of metal object can be pre-set, or these thresholds and references can be updated in real time. When performing detection, according to the above corresponding embodiments, after obtaining the unit multimode amplitude, multi-element multimode amplitude of the target receiving coil and the phase average value and phase slope average value corresponding to the phase data in the target mode, the amplitude response judgment is first performed, that is, if it is judged that the unit multimode amplitude of the target receiving coil is greater than or equal to the second unit multimode amplitude threshold and the multi-element multimode amplitude of the target receiving coil is greater than or equal to the second multi-element multimode amplitude threshold, then the phase response judgment is further performed, that is, if it is judged that the phase average value of the target receiving coil in the target mode meets the second phase average value reference, or the phase slope average value of the target receiving coil in the target mode meets the second phase slope average value reference, then the type of the detected object can be determined to be a third type of metal object. Among them, the volume of the third type of metal object is larger than that of the life type metal, and the amplitude of the detection signal is higher than that of the life type metal. In addition, the third type of metal object has a metal material, but it is different from the metal material of the housing of the mobile electronic device. The third type of metal objects may be contraband, such as kitchen knives, metal tea cans, and gasoline cans. If the third type of metal objects are non-magnetic contraband, the phase is greater than that of the second type of metal objects. If the third type of metal objects are magnetic contraband, the phase slope is greater than that of the second type of metal objects.

[0158] As an embodiment, satisfying the second phase average value benchmark may be within a set numerical range. For example, if the phase average value of the target receiving coil in the target mode is less than the third phase average value threshold or greater than the fourth phase average value threshold), the phase average value is deemed to satisfy the second phase average value benchmark. Furthermore, the third phase threshold may be the same as or similar to the first phase threshold. The fourth phase threshold is the same as or similar to the second phase threshold. Similar means that the difference between the two is a smaller value.

[0159] Similarly, satisfying the second phase slope average value benchmark may also be within a set numerical range. For example, if the phase slope average value of the target receiving coil in the target mode is greater than or equal to the third phase slope threshold, the phase slope average value is deemed to satisfy the second phase slope average value benchmark. Furthermore, the second phase slope threshold may be the same as or similar to the first phase slope threshold. Similar means that the difference between the two is a smaller value.

[0160] In the present embodiment, when detecting third-category metal objects, the amplitude response is also first determined. Since third-category metal objects have a certain volume, if only the unit multi-mode amplitude is determined when determining the amplitude response, household metals may be mistakenly reported as third-category metals (i.e., if household metals are closer to one side of the door panel, their unit multi-mode amplitude values ​​will be similar to the unit multi-mode amplitude values ​​when the third-category metal object is placed in the middle area of ​​the detection device when passing through). Therefore, the present embodiment also determines the multi-element multi-mode amplitude to make a comprehensive determination based on the volume size.

[0161] It should also be noted that the above identification of the second and third types of metal objects involves the phase average and phase slope average. The phase average and phase slope average are related to the material of the detected object. Since the material of mobile electronic devices is different from that of contraband, the phase average and phase slope average can be used to distinguish them.

[0162] Among them, for the second type of metal objects, the reason why both the phase average value and the phase slope average value are needed to identify them is that for magnetic contraband, such as kitchen knives, the phase is close to the phase of mobile electronic devices, but the phase slope is significantly different, so the phase slope can be used to distinguish between magnetic contraband and mobile electronic devices; for non-magnetic contraband, such as steel pipes, the phase slope value is small, similar to mobile electronic devices, but the phase is significantly different from mobile electronic devices, so the phase can be used to distinguish between non-magnetic contraband and mobile electronic devices. In summary, in order to avoid misreporting various types of contraband as mobile electronic devices, the phase and phase slope are needed to jointly identify the second type of metal objects.

[0163] For the third type of metal objects, since they involve contraband, the false alarm rate is more concerned. Therefore, in this embodiment, in order to reduce the false alarm rate, the judgment method adopted for the third type of metal objects is that as long as one of the phase and the phase slope meets the corresponding threshold, it is considered to be a third type of metal object. Since the phase slope of magnetic contraband is relatively high, as long as the phase slope average value meets the second phase slope average value benchmark, this type of contraband can be identified. The phase of non-magnetic contraband is relatively high, so as long as the phase average value meets the second phase average value benchmark, this type of contraband can be identified. Therefore, no matter what type of contraband it is, this embodiment can identify it, thereby reducing the false alarm rate.

[0164] In one embodiment, the method for obtaining the above-mentioned unit multi-mode amplitude threshold and / or multi-element multi-mode amplitude threshold includes:

[0165] First, obtain the door panel position coefficient of the distance between the detected object and the door panel.

[0166] Secondly, a unit multi-mode amplitude threshold and / or a multi-element multi-mode amplitude threshold corresponding to the distance gate position coefficient is set.

[0167] It should be noted that the distance gate position coefficient can reflect the position of the detected object when it passes through the through-type detection device. In the embodiment of the present invention, when the detected object is identified, the corresponding amplitude thresholds (including the first unit multimode amplitude threshold, the second unit multimode amplitude threshold, the third unit multimode amplitude threshold, the first multi-element multimode amplitude threshold and the second multi-element multimode amplitude threshold) can be adjusted according to the position where the detected object passes.

[0168] Specifically, various initial amplitude thresholds may be pre-set, for example, a first initial unit multimode amplitude threshold and a first initial multi-element multimode amplitude threshold for the second type of metal object, a second initial unit multimode amplitude threshold and a second initial multi-element multimode amplitude threshold for the third type of metal object, and a third initial unit multimode amplitude threshold for the first type of metal object. When performing detection, various initial amplitude thresholds may be corrected using the distance door panel position coefficient to obtain corresponding amplitude thresholds, namely, the first unit multimode amplitude threshold, the first multi-element multimode amplitude threshold, the second unit multimode amplitude threshold, the second multi-element multimode amplitude threshold, and the third initial unit multimode amplitude threshold.

[0169] Specifically, the first unit multimode amplitude threshold can be expressed as X p0 *A0, the first multivariate multimode amplitude threshold can be expressed as X p0 *B0, the second unit multimode amplitude threshold can be expressed as X p0 *A1, the second multivariate multimode amplitude threshold can be expressed as X p0 *B1 and the third unit multimode amplitude threshold can be expressed as X p0 *C0. Among them, X p0 Represents the initial distance door panel position coefficient, A0, B0, A1, B1, and C0 are the initial values ​​of each threshold respectively.

[0170] In one embodiment, the receiving coils are respectively arranged on the door panels on both sides of the pass-through detection device, and the number of the receiving coils on the door panels on both sides is the same.

[0171] Then, the process of obtaining the distance door panel position coefficient of the detected object relative to the door panel position may include:

[0172] Step A: summing up the amplitude averages of all receiving coils on the first side door panel in different modes to obtain a first total amplitude average.

[0173] Step B: summing up the amplitude averages of all receiving coils on the second side door panel in different modes to obtain a second total amplitude average.

[0174] Step C: Calculate the ratio of the first total amplitude average value divided by the second total amplitude average value.

[0175] Step D: When the ratio is greater than or equal to 1, the ratio is used as the distance door panel position coefficient. When the ratio is less than 1, the reciprocal of the ratio is used as the distance door panel position coefficient.

[0176] It is understandable that if Figure 2 As shown, in the embodiment of the present invention, it is assumed that the first side door panel is the left door panel and the second side door panel is the right door panel, then the receiving coils on the first side door panel are coil 1, coil 3, coil 5, coil 7, coil 9, and coil 11, then the amplitude average values ​​of the receiving coils on the first side door panel in each mode are summed to obtain the first total amplitude average value. The receiving coils on the second side door panel are coil 2, coil 4, coil 6, coil 8, coil 10, and coil 12, then the amplitude average values ​​of all the receiving coils on the second side door panel in different modes are summed to obtain the second total amplitude average value.

[0177] The following takes the M3 mode as an example to illustrate that the sum of the amplitude averages of the receiving coils on the first side door panel in the M3 mode is:

[0178] .

[0179] in, It indicates the sum of the amplitude average values ​​of the receiving coils on the first side door panel in the M3 mode.

[0180] The sum of the amplitude averages of the receiving coils on the second side door panel in the M3 mode is:

[0181] .

[0182] in, It indicates the sum of the amplitude average values ​​of each receiving coil on the second side door panel in the M3 mode.

[0183] Similarly, the sum of the amplitude averages of each receiving coil on the first side door panel in other modes and the sum of the amplitude averages of each receiving coil on the second side door panel can be calculated in the above manner. That is, it can be obtained that the sum of the amplitude averages of each receiving coil on the first side door panel in the M4 mode is , the receiving coils on the second side door panel are the sum of the average amplitudes in the M4 mode , the receiving coils on the first side door panel are the sum of the amplitude averages in the M5 mode , the receiving coils on the second side door panel are the sum of the amplitude averages in the M5 mode .

[0184] Sum the amplitude averages of all receiving coils on the first side door panel in different modes to obtain the first total amplitude average + + The second total amplitude average is obtained by summing up the amplitude averages of all receiving coils on the second side door panel in different modes. + + Then, the ratio of the first total amplitude average value divided by the second total amplitude average value is further obtained:

[0185] .

[0186] in, It represents the ratio of the first total amplitude average value divided by the second total amplitude average value. When the ratio is greater than or equal to 1, the ratio is used as the distance door panel position coefficient. When the ratio is less than 1, the reciprocal of the ratio is used as the distance door panel position coefficient. The formula is:

[0187] .

[0188] Among them, X p Indicates the distance door panel position coefficient. That is, if the ratio of the first total amplitude average divided by the second total amplitude average is greater than 1, it means that the amplitude of the first side door panel is greater than the amplitude of the second side door panel, and the detected object is close to the first side door panel. The ratio is X p If the ratio is less than 1, it means that the amplitude of the second door panel is greater than that of the first door panel, and the object is close to the second door panel. Conversion is required. The result of dividing 1 by the ratio is X. p .

[0189] The distance door panel position coefficient X in the embodiment of the present invention p It can be used to determine the distance between the detected object and the door panel. p and X p0 The size of X determines whether the corresponding initial amplitude threshold needs to be adjusted. The amplitude threshold in this application is the same as X p The size of X is positively correlated. p The larger the value, the larger the corresponding amplitude threshold. p is 1, then X p The minimum, the corresponding amplitude threshold is also the minimum. In other cases, whether the detected object is close to the left door panel or the right door panel, the threshold will increase. It can be understood that in the embodiment of the present invention, the amplitude threshold is set by the distance door panel position coefficient, which can further improve the recognition accuracy.

[0190] In one embodiment, before identifying the type of the detected object according to the amplitude data and phase data of each receiving coil in different modes in the above S130, the method further includes:

[0191] Obtain the preset detection sequence of the pass-through detection device for multiple types of metal objects.

[0192] Then, the process of identifying the type of the detected object according to the amplitude data and phase data of each receiving coil in different modes in the above S130 may include:

[0193] Each type of metal object among the multiple types of metal objects is determined as a target detection type in turn according to a preset detection order, and based on the amplitude data and phase data of each receiving coil in different modes, it is identified in turn whether the type of the detected object is a target detection type.

[0194] It should be noted that in actual applications, a preset detection order of multiple types of metal objects can be set according to the application scenario of the pass-through detection device, so that when the detected object passes through the pass-through detection device, each type of metal object in the preset detection order is used as a target detection type one by one, and then the type of the detected object is identified according to the amplitude data and phase data of each receiving coil in different modes. Among them, please refer to the above-mentioned embodiments for the specific implementation process of identifying the type of the detected object according to the amplitude data and phase data of each receiving coil in different modes, and the embodiments of the present invention will not be repeated here. The embodiments of the present invention can be applied to a variety of application scenarios, have a wide range of applications, and have high detection accuracy and detection efficiency.

[0195] For example, for scenes with high inspection intensity (such as prisons), the preset detection order can be second-category metal objects (mobile electronic devices, such as mobile phones), third-category metal objects (contraband), and first-category metal objects (daily metals). That is, the type of the detected object can be identified based on the amplitude data and phase data of each receiving coil in different modes. First, it is identified whether the detected object is a second-category metal object (the second-category metal object is the current target detection type). If it is not a second-category metal object, it is identified whether it is a third-category metal object. If it is not a third-category metal object, it is identified whether it is a first-category metal object, thereby determining the type of the detected object.

[0196] For scenes with general inspection intensity (such as subway stations, etc.), the preset detection order can be second-category metal objects (mobile electronic devices, such as mobile phones, etc.) or third-category metal objects (prohibited metals), first-category metal objects (daily metals). That is, the type of the detected object can be identified based on the amplitude data and phase data of each receiving coil in different modes to identify whether the detected object is a second-category metal object or a third-category metal object. If the detected object is not a second-category metal object or a third-category metal object, then it is identified whether the detected object is a first-category metal object (daily metals), thereby determining the type of the detected object.

[0197] Of course, in some other scenarios, the preset detection order can also be set to the first type of metal objects (life-related metals). Since the first type of metal object (including mobile phones and contraband) judgment is the most basic judgment function, as long as the metal characteristics are identified, an alarm can be issued, and there is no need to distinguish between mobile phones and contraband. The specific preset detection order can be determined according to the actual application scenario, and the embodiment of the present invention does not make any special restrictions on this.

[0198] It should be noted that, in the embodiment of the present invention, the first type of metal objects can be identified through the following process:

[0199] Based on the amplitude data of the target receiving coil in all modes, the unit multi-mode amplitude of the target receiving coil is obtained. When the unit multi-mode amplitude is greater than or equal to the amplitude threshold corresponding to the first type of metal object (i.e., the third unit multi-mode amplitude threshold), the type of the detected object is the first type of metal object.

[0200] The second type of metal objects can be identified through the following process:

[0201] Obtain the single-mode multiplication mode coefficient corresponding to the amplitude data of the target receiving coil in each mode, and determine the target mode from all modes according to the single-mode multiplication mode coefficient. Obtain the phase average value and phase slope average value corresponding to the phase data of the target receiving coil in the target mode. Obtain the unit multi-mode amplitude corresponding to the amplitude data of the target receiving coil in all modes. Obtain the amplitude average value corresponding to the amplitude data of the target receiving coil and other receiving coils in the set area in all modes, and obtain the multivariate multi-mode amplitude of the target receiving coil according to the amplitude average value of the target receiving coil and other receiving coils in the above-mentioned set area. When the unit multi-mode amplitude of the target receiving coil is greater than or equal to the first unit multi-mode amplitude threshold, and the multivariate multi-mode amplitude of the target receiving coil is greater than or equal to the first multivariate multi-mode amplitude threshold, if the phase average value of the target receiving coil in the target mode meets the first phase average value benchmark, and the phase slope average value meets the first phase slope average value benchmark, the type of the detected object is determined to be a second-class metal object.

[0202] The third type of metal objects can be identified through the following process:

[0203] Obtain the single-mode multiplication mode coefficient corresponding to the amplitude data of the target receiving coil in each mode. Determine the target mode from all modes according to the single-mode multiplication mode coefficient. Obtain the phase average value and phase slope average value corresponding to the phase data of the target receiving coil in the target mode. Obtain the unit multi-mode amplitude corresponding to the amplitude data of the target receiving coil in all modes. Obtain the amplitude average value corresponding to the amplitude data of the target receiving coil and other receiving coils in the set area in all modes, and obtain the multivariate multi-mode amplitude of the target receiving coil according to the amplitude average value of the target receiving coil and other receiving coils in the above-mentioned set area. When the unit multi-mode amplitude of the target receiving coil is greater than or equal to the second unit multi-mode amplitude threshold, and the multivariate multi-mode amplitude of the target receiving coil is greater than or equal to the second multivariate multi-mode amplitude threshold, if the phase average value of the target receiving coil in the target mode meets the second phase average value benchmark, or the phase slope average value of the target receiving coil in the target mode meets the second phase slope average value benchmark, the type of the detected object is determined to be a third-class metal object.

[0204] In addition, for the specific identification process of the first type of metal objects, the second type of metal objects, and the third type of metal objects, please refer to the introduction of the corresponding parts in the above embodiments, and the embodiments of the present invention will not be repeated here.

[0205] It should also be noted that, in this embodiment, the reason why the type of the detected object is identified based on the relevant detection parameters of the target receiving coil (such as the above-mentioned unit multi-mode amplitude, multi-element multi-mode amplitude, phase average, phase slope average, etc.) is that: if the detection parameters of all receiving coils are used for identification, when the volume of the detected object is large, a false alarm may occur. Because the type of the detected object needs to be identified based on the phase data, if the volume of the detected object is large, the amplitude of the receiving coil facing the detected object is the largest (the unit multi-mode amplitude value is also the largest accordingly), and the phase value is the most accurate reflection of the characteristics of the detected object, but the phase value may not be as large as that of other receiving coils. Although the amplitude parameters (such as the unit multi-mode amplitude) of other receiving coils (such as the receiving coil adjacent to the facing receiving coil) are not the largest, due to the large volume of the detected object, they may also be at least greater than the amplitude threshold (such as the unit multi-mode amplitude threshold), and because the adjacent receiving coil is not facing the detected object, the phase value may also be larger. In this way, the adjacent receiving coil may meet both the amplitude threshold and the phase reference. If the adjacent receiving coil is used to identify the type of the detected object, its phase data cannot accurately reflect the characteristics of the detected object, which may cause a false alarm. In order to overcome the above problem, this embodiment first selects the receiving coil with the largest unit multi-mode amplitude, that is, the target receiving coil. Since the target receiving coil is closest to the detected object and its phase can most accurately reflect the characteristics of the detected object, the type of the detected object is identified based on the relevant detection parameters of the target receiving coil, which can improve the recognition accuracy.

[0206] The embodiment of the present invention also provides a corresponding device for the detection and identification method of the pass-through detection device, which further makes the method more practical. Among them, the device can be described from the perspective of the functional module and the perspective of the hardware. The detection and identification device of the pass-through detection device provided by the embodiment of the present invention is introduced below. The device is used to implement the detection and identification method of the pass-through detection device provided by the embodiment of the present invention. In this embodiment, the detection and identification device of the pass-through detection device may include or be divided into one or more program modules, and the one or more program modules are stored in a storage medium and executed by one or more processors to complete the detection and identification method of the pass-through detection device disclosed in the above embodiment. The program module referred to in the embodiment of the present invention refers to a series of computer program instruction segments that can complete specific functions, which is more suitable for describing the execution process of the detection and identification device of the pass-through detection device in the storage medium than the program itself. The following description will specifically introduce the functions of each program module of this embodiment. The detection and identification device of the pass-through detection device described below and the detection and identification method based on the pass-through detection device described above can be referred to in correspondence with each other.

[0207] From the perspective of functional modules, see Fig.12 , Fig.12A structural diagram of a detection and identification device of a pass-through detection device provided by an embodiment of the present invention, the detection and identification device may include:

[0208] The acquisition module 11 is used to acquire the detection signals of each receiving coil of the through-type detection device in different modes when the detection object passes through the through-type detection device. The determination module 12 is used to determine the amplitude data and phase data of the receiving coil in different modes according to the detection signals of the receiving coil in different modes. The identification module 13 is used to identify the type of the detection object according to the amplitude data and phase data of each receiving coil in different modes.

[0209] In one embodiment, the identification module 13 includes:

[0210] The first determination unit is used to determine the target receiving coil according to the amplitude data of each receiving coil in different modes. The first identification unit is used to identify the type of the detection object according to the amplitude data and / or phase data of the target receiving coil in different modes.

[0211] In one embodiment, the first determining unit includes:

[0212] The first calculation subunit is used to obtain the unit multi-mode amplitude of each receiving coil based on the amplitude data of each receiving coil in all modes. The first determination subunit is used to determine the maximum unit multi-mode amplitude from the unit multi-mode amplitudes of all receiving coils. The second determination subunit is used to use the receiving coil corresponding to the maximum unit multi-mode amplitude as the target receiving coil.

[0213] In one embodiment, the first computing subunit includes:

[0214] The second calculation subunit is used to calculate the amplitude average value of the i-th receiving coil in the j-th mode according to the amplitude data of the i-th receiving coil in the j-th mode, wherein i∈[1,N], j∈[1,M], N is the total number of receiving coils, M is the total number of modes, and both N and M are integers greater than 1. The third calculation subunit is used to sum the amplitude average values ​​of the i-th receiving coil in the M modes to obtain the unit multi-mode amplitude of the i-th receiving coil.

[0215] In one embodiment, the first identification unit includes:

[0216] The first acquisition subunit is used to obtain the unit multi-mode amplitude of the target receiving coil based on the amplitude data of the target receiving coil in all modes. The first identification subunit is used to identify whether the type of the detected object is a first-class metal object according to the unit multi-mode amplitude of the target receiving coil and the corresponding unit multi-mode amplitude threshold.

[0217] In one embodiment, the first identification unit includes:

[0218] The second acquisition subunit is used to acquire the single-mode multiplication mode coefficient corresponding to the amplitude data of the target receiving coil in each mode. The third determination subunit is used to determine the target mode from all modes according to the single-mode multiplication mode coefficient. The second identification subunit is used to identify the type of the detection object according to the amplitude data of the target receiving coil in all modes and the phase data of the target receiving coil in the target mode.

[0219] In one embodiment, the second identification subunit comprises:

[0220] The third acquisition subunit is used to obtain the phase average value and phase slope average value corresponding to the phase data of the target receiving coil in the target mode. The fourth acquisition subunit is used to obtain the unit multi-mode amplitude of the target receiving coil based on the amplitude data of the target receiving coil in all modes. The fifth acquisition subunit is used to obtain the amplitude average value corresponding to the amplitude data of the target receiving coil and other receiving coils in the set area in all modes, and obtain the multivariate multi-mode amplitude of the target receiving coil according to the amplitude average value of the target receiving coil and other receiving coils in the above-mentioned set area. The third identification subunit is used to identify the type of the detected object according to the comparison result of the unit multi-mode amplitude threshold value and the unit multi-mode amplitude of the target receiving coil, the comparison result of the multivariate multi-mode amplitude threshold value and the multivariate multi-mode amplitude of the target receiving coil, the comparison result of the phase average value benchmark and the phase average value of the target receiving coil in the target mode, and the comparison result of the phase slope average value benchmark and the phase slope average value of the target receiving coil in the target mode.

[0221] In one embodiment, the unit multimode amplitude threshold comprises a first unit multimode amplitude threshold, the multivariate multimode amplitude threshold comprises a first multivariate multimode amplitude threshold, the phase average reference comprises a first phase average reference, and the phase slope average reference comprises a first phase slope average reference.

[0222] Then, the third identification subunit is used to:

[0223] When the unit multi-mode amplitude of the target receiving coil is greater than or equal to the first unit multi-mode amplitude threshold, and the multi-component multi-mode amplitude of the target receiving coil is greater than or equal to the first multi-component multi-mode amplitude threshold, if the phase average value of the target receiving coil in the target mode satisfies the first phase average value criterion, and the phase slope average value of the target receiving coil in the target mode satisfies the first phase slope average value criterion, the type of the detected object is determined to be a second-class metal object.

[0224] In one embodiment, the unit multimode amplitude threshold includes a second unit multimode amplitude threshold, the multivariate multimode amplitude threshold includes a second multivariate multimode amplitude threshold, the phase average reference includes a second phase average reference, and the phase slope average reference includes a second phase slope average reference.

[0225] Then, the third identification subunit is used to:

[0226] When the unit multi-mode amplitude of the target receiving coil is greater than or equal to the second unit multi-mode amplitude threshold, and the multi-component multi-mode amplitude of the target receiving coil is greater than or equal to the second multi-component multi-mode amplitude threshold, if the phase average value of the target receiving coil in the target mode satisfies the second phase average value criterion, or the phase slope average value of the target receiving coil in the target mode satisfies the second phase slope average value criterion, the type of the detected object is determined to be a third-category metal object.

[0227] In one embodiment, the second acquisition subunit is used to:

[0228] The amplitude data of the target receiving coil in the jth mode is corrected by using the mode coefficient of the target receiving coil in the jth mode to obtain the single-mode multiplication mode coefficient of the target receiving coil in the jth mode. The mode coefficient is used to reflect the proportional relationship of the detection signal of the receiving coil in different modes, j∈[1,M], M is the total number of modes, and M is an integer greater than 1.

[0229] Then, the third determining subunit includes:

[0230] The fourth determination subunit is used to determine the largest single-mode multiplication mode coefficient from the single-mode multiplication mode coefficients corresponding to the M different modes. The fifth determination subunit is used to use the mode corresponding to the largest single-mode multiplication mode coefficient as the target mode.

[0231] In one embodiment, the fifth acquisition subunit includes:

[0232] The sixth determination subunit is used to determine the multivariate multimode amplitude of the target receiving coil and the receiving coils in the set area according to the average amplitude of the target receiving coil and the other receiving coils in the set area. The seventh determination subunit is used to determine the maximum multivariate multimode amplitude from the multivariate multimode amplitudes of the target receiving coil and the other receiving coils in the set area. The eighth determination subunit is used to use the maximum multivariate multimode amplitude as the multivariate multimode amplitude of the target receiving coil.

[0233] In one embodiment, the sixth determining subunit includes:

[0234] The sixth acquisition subunit is used to obtain the coil coefficient corresponding to the receiving coil and the mode coefficient of the receiving coil in each mode. The coil coefficient is used to reflect the proportional relationship of the detection signals of the receiving coils in different positions. The mode coefficient is used to reflect the proportional relationship of the detection signals of the receiving coils in different modes. The ninth determination subunit is used to determine one or more adjacent receiving coils corresponding to the receiving coil according to the position of the receiving coil. The fourth calculation subunit is used to calculate the amplitude average value of the receiving coil in the jth mode and the sum of the amplitude average values ​​of each adjacent receiving coil of the receiving coil in the jth mode to obtain the cumulative amplitude of the receiving coil in the jth mode. The fifth calculation subunit is used to calculate the product of the coil coefficient of the receiving coil, the mode coefficient of the receiving coil in the jth mode and the cumulative amplitude of the receiving coil in the jth mode to obtain the multivariate single-mode amplitude of the receiving coil in the jth mode. The sixth calculation subunit is used to add the multivariate single-mode amplitudes of the receiving coil in all modes to obtain the multivariate multi-mode amplitude of the receiving coil.

[0235] In one embodiment, the first identification subunit or the third identification subunit includes:

[0236] The seventh acquisition subunit is used to acquire the distance door panel position coefficient of the detection object relative to the door panel. The setting subunit is used to set the unit multi-mode amplitude threshold and / or the multi-element multi-mode amplitude threshold corresponding to the distance door panel position coefficient.

[0237] In one embodiment, the receiving coils are respectively arranged on the door panels on both sides of the pass-through detection device, and the number of the receiving coils on the door panels on both sides is the same.

[0238] Then, the seventh acquisition subunit includes:

[0239] The seventh calculation subunit is used to sum the amplitude average values ​​of all the receiving coils on the first side door panel in different modes to obtain a first total amplitude average value. The eighth calculation subunit is used to sum the amplitude average values ​​of all the receiving coils on the second side door panel in different modes to obtain a second total amplitude average value. The ninth calculation subunit is used to calculate the ratio of the first total amplitude average value divided by the second total amplitude average value. The tenth determination subunit is used to use the ratio as the distance door panel position coefficient when the ratio is greater than or equal to 1. The eleventh determination subunit is used to use the reciprocal of the ratio as the distance door panel position coefficient when the ratio is less than 1.

[0240] In one embodiment, it also includes:

[0241] The acquisition unit is used to acquire the preset detection sequence of the pass-through detection device for multiple types of metal objects.

[0242] Then, the identification module 13 is used to:

[0243] Each type of metal object among the multiple types of metal objects is determined as a target detection type in turn according to a preset detection order, and based on the amplitude data and phase data of each receiving coil in different modes, it is identified in turn whether the type of the detected object is a target detection type.

[0244] It should be noted that the detection and identification device of the through-type detection device provided in the embodiment of the present invention has the same beneficial effects as the detection and identification method of the through-type detection device provided in the above-mentioned embodiment, and for the specific introduction of the detection and identification method of the through-type detection device involved in the embodiment of the present invention, please refer to the above-mentioned embodiment, and this application will not repeat it here.

[0245] The detection and identification device of the pass-through detection device mentioned above is described from the perspective of a functional module. Further, an embodiment of the present invention further provides a pass-through detection device, which includes a memory, a processor, and a plurality of transmitting coils and a plurality of receiving coils arranged on each side door panel of the pass-through detection device, wherein:

[0246] The memory is used to store the computer program. The processor is used to implement the steps of the detection and identification method of the pass-through detection device when executing the computer program.

[0247] On the basis of the above embodiment, an embodiment of the present invention further provides a security door, which includes a memory, a processor, and a plurality of transmitting coils and a plurality of receiving coils arranged on each side door panel of a pass-through detection device, wherein:

[0248] The memory is used to store the computer program. The processor is used to implement the steps of the detection and identification method of the pass-through detection device when executing the computer program.

[0249] It should be noted that the processor in the embodiment of the present invention may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor may be implemented in at least one hardware form of DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), and PLA (Programmable Logic Array). The processor may also include a main processor and a coprocessor. The main processor is a processor for processing data in the awake state, also known as a CPU (Central Processing Unit). The coprocessor is a low-power processor for processing data in the standby state. In some embodiments, the processor may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the processor may also include an AI (Artificial Intelligence) processor, which is used to process computing operations related to machine learning.

[0250] The memory may include one or more computer-readable storage media, which may be non-transitory. The memory may also include high-speed random access memory, and non-volatile memory, such as one or more disk storage devices, flash memory storage devices. In some embodiments, the memory may be an internal storage unit of the pass-through detection device or security door, such as a hard disk of a server. In other embodiments, the memory may also be an external storage device of the pass-through detection device or security door, such as a plug-in hard disk equipped on the server, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. Further, the memory may also include both an internal storage unit and an external storage device of the pass-through detection device or security door. The memory can not only be used to store application software and various types of data installed in the pass-through detection device or security door, such as: the code of the program in the process of executing the detection and identification method of the pass-through detection device, but also can be used to temporarily store data that has been output or is to be output. In this embodiment, the memory 20 is at least used to store the following computer program 201, wherein after the computer program is loaded and executed by the processor 21, the relevant steps of the detection and identification method of the pass-through detection device disclosed in any of the above embodiments can be implemented. In addition, the resources stored in the memory 20 may also include an operating system 202 and data 203, etc., and the storage method may be temporary storage or permanent storage. Among them, the operating system 202 may include Windows, Unix, Linux, etc. The data 203 may include but is not limited to (data corresponding to the detection and identification results of the pass-through detection device) and the like.

[0251] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0252] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0253] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A detection and identification method for a pass-through detection device, characterized in that: include: When the detected object passes through the through-type detection device, the detection signals of each receiving coil of the through-type detection device in different modes are obtained; Determine amplitude data and phase data of the receiving coil in different modes according to the detection signal of the receiving coil in different modes; The type of the detected object is identified according to the amplitude data and phase data of each receiving coil in different modes.

2. The detection and identification method of a pass-through detection device according to claim 1, characterized in that: The identifying the type of the detected object according to the amplitude data and the phase data of each receiving coil in different modes includes: determining a target receiving coil according to the amplitude data of each receiving coil in different modes; The type of the detected object is identified according to the amplitude data and / or phase data of the target receiving coil in different modes.

3. The detection and identification method of a pass-through detection device according to claim 2, characterized in that: The step of determining a target receiving coil according to the amplitude data of each receiving coil in different modes includes: Based on the amplitude data of each receiving coil in all the modes, obtaining the unit multi-mode amplitude of each receiving coil; Determine the maximum unit multi-mode amplitude from the unit multi-mode amplitudes of all the receiving coils; The receiving coil corresponding to the maximum unit multi-mode amplitude is used as the target receiving coil.

4. The detection and identification method of a pass-through detection device according to claim 3, characterized in that: The obtaining of the unit multi-mode amplitude of each receiving coil based on the amplitude data of each receiving coil in all the modes comprises: According to the amplitude data of the i-th receiving coil in the j-th mode, calculate the amplitude average value of the i-th receiving coil in the j-th mode; wherein i∈[1,N], j∈[1,M], N is the total number of receiving coils, M is the total number of modes, and both N and M are integers greater than 1; The average amplitudes of the i-th receiving coil in the M modes are summed to obtain the unit multi-mode amplitude of the i-th receiving coil.

5. The detection and identification method of a pass-through detection device according to claim 2, characterized in that: The identifying the type of the detected object according to the amplitude data and / or phase data of the target receiving coil in different modes includes: Based on the amplitude data of the target receiving coil in all the modes, obtaining the unit multi-mode amplitude of the target receiving coil; According to the unit multi-mode amplitude of the target receiving coil and the corresponding unit multi-mode amplitude threshold, it is identified whether the type of the detected object is a first-category metal object.

6. The detection and identification method of a pass-through detection device according to claim 2, characterized in that: The identifying the type of the detected object according to the amplitude data and / or phase data of the target receiving coil in different modes includes: Acquire the single-mode multiplication mode coefficient corresponding to the amplitude data of the target receiving coil in each mode; Determine a target mode from all the modes according to the single mode multiplied by the mode coefficient; The type of the detected object is identified according to the amplitude data of the target receiving coil in all the modes and the phase data of the target receiving coil in the target mode.

7. The detection and identification method of a pass-through detection device according to claim 6, characterized in that: The identifying the type of the detected object according to the amplitude data of the target receiving coil in all the modes and the phase data of the target receiving coil in the target mode includes: Obtaining a phase average value and a phase slope average value corresponding to the phase data of the target receiving coil in the target mode; Based on the amplitude data of the target receiving coil in all the modes, obtaining the unit multi-mode amplitude of the target receiving coil; Obtaining the amplitude average corresponding to the amplitude data of the target receiving coil and other receiving coils in the set area in all the modes, and obtaining the multivariate multimode amplitude of the target receiving coil according to the amplitude average of the target receiving coil and other receiving coils in the set area; The type of the detected object is identified based on the comparison result of the unit multi-mode amplitude threshold and the unit multi-mode amplitude of the target receiving coil, the comparison result of the multi-multi-mode amplitude threshold and the multi-multi-multi-mode amplitude of the target receiving coil, the comparison result of the phase average value benchmark and the phase average value of the target receiving coil in the target mode, and the comparison result of the phase slope average value benchmark and the phase slope average value of the target receiving coil in the target mode.

8. The detection and identification method of a pass-through detection device according to claim 7, characterized in that: The unit multimode amplitude threshold includes a first unit multimode amplitude threshold, and the multivariate multimode amplitude threshold includes a first multivariate multimode amplitude threshold; the phase average value reference includes a first phase average value reference, and the phase slope average value reference includes a first phase slope average value reference; Then, the type of the detected object is identified according to the comparison result between the unit multi-mode amplitude threshold and the unit multi-mode amplitude of the target receiving coil, the comparison result between the multi-element multi-mode amplitude threshold and the multi-element multi-mode amplitude of the target receiving coil, the comparison result between the phase average value benchmark and the phase average value of the target receiving coil in the target mode, and the comparison result between the phase slope average value benchmark and the phase slope average value of the target receiving coil in the target mode, including: When the unit multi-mode amplitude of the target receiving coil is greater than or equal to the first unit multi-mode amplitude threshold, and the multi-component multi-mode amplitude of the target receiving coil is greater than or equal to the first multi-component multi-mode amplitude threshold, if the phase average value of the target receiving coil in the target mode satisfies the first phase average value criterion, and the phase slope average value of the target receiving coil in the target mode satisfies the first phase slope average value criterion, it is determined that the type of the detected object is a second type metal object.

9. The detection and identification method of a pass-through detection device according to claim 7, characterized in that: The unit multimode amplitude threshold includes a second unit multimode amplitude threshold, and the multivariate multimode amplitude threshold includes a second multivariate multimode amplitude threshold; the phase average value reference includes a second phase average value reference, and the phase slope average value reference includes a second phase slope average value reference; Then, the type of the detected object is identified according to the comparison result between the unit multi-mode amplitude threshold and the unit multi-mode amplitude of the target receiving coil, the comparison result between the multi-element multi-mode amplitude threshold and the multi-element multi-mode amplitude of the target receiving coil, the comparison result between the phase average value benchmark and the phase average value of the target receiving coil in the target mode, and the comparison result between the phase slope average value benchmark and the phase slope average value of the target receiving coil in the target mode, including: When the unit multi-mode amplitude of the target receiving coil is greater than or equal to the second unit multi-mode amplitude threshold, and the multi-component multi-mode amplitude of the target receiving coil is greater than or equal to the second multi-component multi-mode amplitude threshold, if the phase average value of the target receiving coil in the target mode satisfies the second phase average value criterion, or the phase slope average value of the target receiving coil in the target mode satisfies the second phase slope average value criterion, it is determined that the type of the detected object is a third type metal object.

10. The detection and identification method of a pass-through detection device according to claim 6, characterized in that: The step of obtaining the single-mode multiplication mode coefficient corresponding to the amplitude data of the target receiving coil in each mode includes: The amplitude data of the target receiving coil in the jth mode is corrected by using the mode coefficient of the target receiving coil in the jth mode to obtain the single-mode multiplication mode coefficient of the target receiving coil in the jth mode; wherein the mode coefficient is used to reflect the proportional relationship of the detection signal of the receiving coil in different modes, j∈[1,M], M is the total number of modes, and M is an integer greater than 1; Then, determining the target mode from all the modes according to the single mode multiplication mode coefficient includes: Determine the largest single-mode multiplication mode coefficient from the single-mode multiplication mode coefficients corresponding to the M different modes; The mode corresponding to the largest single-mode multiplication mode coefficient is used as the target mode.

11. The detection and identification method of a pass-through detection device according to claim 7, characterized in that: The step of obtaining the multivariate and multimode amplitude of the target receiving coil according to the amplitude average of the target receiving coil and other receiving coils in the set area includes: Determine the multivariate multimode amplitudes of the target receiving coil and the other receiving coils in the set area according to the average amplitudes of the target receiving coil and the other receiving coils in the set area; Determine the maximum multivariate multimode amplitude from the multivariate multimode amplitudes of the target receiving coil and other receiving coils in the set area; The maximum multivariate multimode amplitude is used as the multivariate multimode amplitude of the target receiving coil.

12. The detection and identification method of a pass-through detection device according to any one of claims 7 to 11, characterized in that: For any of the receiving coils, the method for calculating the multivariate multimode amplitude includes: Obtaining the coil coefficient corresponding to the receiving coil and the mode coefficient of the receiving coil in each mode; the coil coefficient is used to reflect the proportional relationship of the detection signals of the receiving coils in different positions; the mode coefficient is used to reflect the proportional relationship of the detection signals of the receiving coils in different modes; Determine one or more adjacent receiving coils corresponding to the receiving coil according to the position of the receiving coil; Calculate the amplitude average value of the receiving coil in the jth mode and the sum of the amplitude average values ​​of each of the adjacent receiving coils of the receiving coil in the jth mode to obtain the cumulative amplitude of the receiving coil in the jth mode; Calculate the product of the coil coefficient of the receiving coil, the mode coefficient of the receiving coil in the j-th mode, and the cumulative amplitude of the receiving coil in the j-th mode to obtain the multivariate single-mode amplitude of the receiving coil in the j-th mode; The multivariate single-mode amplitudes of the receiving coil in all modes are added together to obtain the multivariate multi-mode amplitude of the receiving coil.

13. The detection and identification method of a pass-through detection device according to any one of claims 5 or 7, characterized in that: The method for obtaining the unit multi-mode amplitude threshold comprises: Obtaining a distance door panel position coefficient of the detection object relative to the door panel position; A unit multimode amplitude threshold corresponding to the distance door panel position coefficient is set.

14. The detection and identification method of a pass-through detection device according to claim 13, characterized in that: Each of the receiving coils is respectively arranged on the door panels on both sides of the pass-through detection device, and the number of the receiving coils on the door panels on both sides is the same; Then, obtaining the distance door panel position coefficient of the detection object relative to the door panel position includes: Sum the amplitude averages of all receiving coils on the first side door panel in different modes to obtain a first total amplitude average; Sum the amplitude averages of all receiving coils on the second side door panel in different modes to obtain a second total amplitude average; Calculating a ratio of the first total amplitude average divided by the second total amplitude average; When the ratio is greater than or equal to 1, the ratio is used as the distance door panel position coefficient; When the ratio is less than 1, the reciprocal of the ratio is used as the distance door panel position coefficient.

15. The detection and identification method of a pass-through detection device according to claim 1, characterized in that: Before identifying the type of the detected object according to the amplitude data and phase data of each receiving coil in different modes, the method further includes: Obtaining a preset detection sequence of the pass-through detection device for multiple types of metal objects; Then, identifying the type of the detected object according to the amplitude data and phase data of each receiving coil in different modes includes: Each type of metal object among the multiple types of metal objects is determined as a target detection type in turn according to the preset detection order, and based on the amplitude data and phase data of each receiving coil in different modes, it is identified in turn whether the type of the detected object is a target detection type.

16. A detection and identification device for a pass-through detection device, characterized in that: The detection and identification device comprises: An acquisition module, used for acquiring detection signals of each receiving coil of the through-type detection device in different modes when the detected object passes through the through-type detection device; A determination module, used to determine the amplitude data and phase data of the receiving coil in different modes according to the detection signal of the receiving coil in different modes; The identification module is used to identify the type of the detection object according to the amplitude data and phase data of each receiving coil in different modes.

17. A through-type detection device, characterized in that: The pass-through detection device includes a memory, a processor, and a plurality of transmitting coils and a plurality of receiving coils arranged on each side door panel of the pass-through detection device, wherein: The memory is used to store computer programs; The processor is used to implement the steps of the detection and identification method of the pass-through detection device according to any one of claims 1 to 15 when executing the computer program.

18. A security door, characterized in that: The security door includes a memory, a processor, and a plurality of transmitting coils and a plurality of receiving coils arranged on each side door panel of the pass-through detection device, wherein: The memory is used to store computer programs; The processor is used to implement the steps of the detection and identification method of the pass-through detection device according to any one of claims 1 to 15 when executing the computer program.

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