Coil structure, attitude recognition method and device of a magnetic induction type probe

Abstract

The application discloses a coil structure of a through-type detector, a plate-shaped metal article posture identification method and device, wherein the coil structure of the through-type detector comprises double-side oppositely arranged transmitting coil groups, and an intermediate channel is formed between the two groups for passing a measured object; each single-side transmitting coil group of the double-side transmitting coil group comprises a first transmitting coil and a second transmitting coil; the first transmitting coil comprises an upper coil and a lower coil, and the first transmitting coil is arranged in an area enclosed by the second transmitting coil; the normal directions of the upper coil and the lower coil of the single side are opposite at the same time, the normal directions of the two upper coils of the double-side transmitting coil group are opposite at the same time, and the normal directions of the double-side second transmitting coils are the same. The coil structure of the through-type detector reduces the missed detection rate, and the plate-shaped metal article posture identification method and device judge the posture of the plate-shaped metal article by the number of different frequency signal amplitude ratios.

Description

Technical Field

[0001] This invention relates to the field of walk-through detector technology, and more particularly to a coil structure and attitude recognition method for a walk-through detector. Background Technology

[0002] In traditional detection technologies, coils are installed inside the door panels on both sides of the walk-through detector. The magnetic field lines inside the detector are distributed horizontally from one side of the door panel to the other. When a person carrying a plate-shaped metal object, such as a mobile phone or tablet, passes through the walk-through detector while keeping the maximum cross-section of the plate-shaped metal object parallel to the direction of the horizontal magnetic field lines, the eddy current effect generated is small because the cross-section of the plate-shaped metal object passing through the horizontal magnetic field lines is very small, and fewer magnetic field lines pass through. As a result, the detected eddy current signal is weak, which may lead to the detector missing detections. The reliability of the detection results is greatly reduced. In other words, traditional walk-through detectors cannot guarantee that metal panels or mobile phones can be detected in any posture.

[0003] In addition, regulators in the field of detector applications hope to be able to detect the posture of plate-shaped metal objects in order to more easily find the location where the person being tested has hidden the plate-shaped metal object. Summary of the Invention

[0004] This invention provides a coil structure for a walk-through detector, a method and apparatus for recognizing the posture of plate-shaped metal objects, thereby improving the detection reliability of the walk-through detector, reducing missed detections, and recognizing the posture of plate-shaped metal objects.

[0005] In a first aspect, the present invention provides a coil structure for a through-type detector, which includes a pair of transmitting coils arranged opposite each other on both sides, forming an intermediate channel between them for the object to be measured to pass through; Each of the two-sided transmitting coil groups includes a first transmitting coil and a second transmitting coil; the first transmitting coil includes an upper coil and a lower coil, and the first transmitting coil is disposed within the area enclosed by the second transmitting coil; The normal directions of the upper and lower coils on one side are opposite at the same time, and the normal directions of the two upper coils of the double-sided transmitting coil group are opposite at the same time; the normal directions of the second transmitting coils on both sides are in the same direction; in the three-dimensional space of the middle channel, electromagnetic fields in three directions of x, y, and z are formed; where x is perpendicular to the door panel, y is through the middle channel, and z is perpendicular to the ground, and x, y, and z are perpendicular to each other.

[0006] In this scheme, an electromagnetic field in the x-axis direction is generated by the normal directions of the two second transmitting coils on both sides, which are set in the same direction. The normal directions of the upper coils of the two first transmitting coils on both sides are opposite at the same time, while the normal directions of the lower coils are opposite at the same time. The magnetic field lines generated by the horizontally aligned transmitting coils are in opposite directions, causing the magnetic field lines in the middle of the channel to deflect parallel to the y-axis, which is the direction in which the object being measured passes through the channel. Due to the compression of the relative magnetic fields by the upper coils on both sides, and the opposite normal directions of the upper and lower coils of the single-sided transmitting coil group at the same time, the magnetic field lines deformed by the compression of the bilateral electromagnetic field enter the lower coil from the upper coil, forming a ring-shaped magnetic field, thus generating a magnetic field in the z-axis direction. Therefore, when the maximum cross-section of a plate-shaped metal object is in any of the x, y, and z directions, a large number of magnetic field lines can pass through, generating a strong eddy current signal, thereby improving the reliability of the coil structure in detecting plate-shaped metal objects and avoiding missed detections. The first transmitting coil is set within the area enclosed by the second transmitting coil; this compensates for the loss of the horizontal magnetic field caused by the magnetic field compression between the upper and lower coils of the first transmitting coil structure due to their opposite normals, and further improves the detection sensitivity of the coil structure when detecting plate-shaped metal objects parallel to the door panel.

[0007] As an improvement to the above scheme, the first transmitting coil operates at a first frequency, i.e., its operating current frequency is the first frequency, and the second transmitting coil operates at a second frequency, i.e., its operating current frequency is the second frequency. Several pairs of differential receiving coil groups are longitudinally arranged in the upper and lower coils as detection areas to receive signals of the first and second frequencies. The signals are then separated by a frequency selection circuit to obtain data under the electromagnetic field of the first frequency and data under the electromagnetic field of the second frequency.

[0008] In this scheme, the first and second transmitting coils are set to different frequencies to identify the posture of the plate-shaped metal object. If the signal amplitude of the first frequency is very small, while the signal amplitude of the second frequency is very large, the maximum amplitude signal can only be measured when the magnetic field lines pass through the largest cross-section of the plate-shaped metal object. Since the signal of the second frequency is emitted by the second transmitting coil, and its magnetic field lines are perpendicular to the door panel along the x-direction, the largest cross-section of the plate-shaped metal object is parallel to the door panel. If the signal amplitude of the first frequency is very large, while the signal amplitude of the second frequency is very small, the magnetic field lines generated by the first transmitting coil are either along the y-axis (perpendicular to the abdomen of the person being tested) or along the z-axis (perpendicular to the ground). Then, by combining the combined signals obtained from the first frequency signal in both the y and z-axis directions with the data from the detection areas of multiple receiving coils for comparative analysis, the posture of the plate-shaped metal object—whether its largest cross-section is parallel to the abdomen of the person being tested or parallel to the ground—can be determined.

[0009] Preferably, the upper coil and the lower coil are electrically connected.

[0010] Optionally, the upper and lower coils are electrically disconnected.

[0011] Secondly, the present invention provides a method for recognizing the posture of a plate-shaped metal object, employing the coil structure of the aforementioned through-type detector, the method comprising: Several detection zones receive coils that receive first and second frequency signals corresponding to the plate-shaped metal object; Frequency selection is used to acquire the first frequency signal and the second frequency signal; The second amplitude value under the action of the electromagnetic field in the x-direction is extracted using the second frequency signal; The first amplitude under the combined electromagnetic field action in the y and z directions is extracted using the first frequency signal; When the data of the first amplitude in each detection zone is greater than the data of the second amplitude; The number of times the ratio of the first amplitude to the second amplitude is higher than the first threshold is used to determine the orientation of the plate-shaped metal object parallel to the ground.

[0012] In this scheme, the upper and lower coils operating at the first frequency are figure-eight wound. The number of wires generating the magnetic field in the z-direction is twice the number of wires generating the magnetic field in the y-direction. The ratio of the first amplitude of the first frequency to the second amplitude of the second frequency is used as the criterion. When the ratio is relatively large, it indicates that the first amplitude is mainly generated by the magnetic field in the z-direction, so the maximum cross-section of the plate-shaped metal object is parallel to the ground. When the ratio is relatively small, it indicates that the first amplitude is mainly generated by the magnetic field in the y-direction, so the maximum cross-section of the plate-shaped metal object is parallel to the abdomen of the person being tested.

[0013] As an improvement to the above scheme, the method further includes the step of: determining the parallel posture of the plate-shaped metal object to the abdomen by the number of times the ratio of the first amplitude to the second amplitude is below a first threshold.

[0014] As an improvement to the above scheme, if the ratio is higher than a second threshold, the plate-shaped metal object is determined to be in the corresponding posture. The setting of the second threshold in this step prevents random exceptions in the data.

[0015] As an improvement to the above scheme, the plate-shaped metal object posture recognition method further includes the step of: obtaining the second amplitude value of the receiving coil signal of the plurality of detection areas, which is used to determine the position of the plate-shaped metal object in the detection area.

[0016] Thirdly, the present invention provides a method for recognizing the posture of a plate-shaped metal object, employing the coil structure of the aforementioned through-type detector, the method comprising: A single-sided door panel with several detection zones receives the first and second frequency signals from a plate-shaped metal object using a receiving coil. Select the first frequency signal and the second frequency signal; The second amplitude value under the action of the electromagnetic field in the x-direction is extracted using the second frequency signal; The first amplitude under the combined electromagnetic field action in the y and z directions is extracted using the first frequency signal; If the data of the first amplitude in each detection zone is less than the data of the second amplitude, it is determined that the plate-shaped metal object is parallel to the door panel.

[0017] In this scheme, the electromagnetic field magnetic field lines of the second transmitting coil in the same direction pass through the largest cross section of the plate-shaped metal object the most. Compared with the y-axis electromagnetic field and z-axis electromagnetic field passing through the end face of the plate-shaped metal object, the second amplitude of the receiving coil signal is the largest. Therefore, it can be used to determine whether the plate-shaped metal object under test is parallel to the door panel.

[0018] As an improvement to the above scheme, the plate-shaped metal object posture recognition method further includes the step of: obtaining the second amplitude value of the receiving coil signal of the plurality of detection areas, which is used to determine the position of the plate-shaped metal object in the detection area.

[0019] As an improvement to the above solution, the method further includes displaying the posture information detection results through text and / or images.

[0020] Fourthly, the present invention provides a plate-shaped metal object posture recognition device, employing the coil structure of the aforementioned through-type detector, the device comprising: A signal receiving unit is used to receive signals containing a first frequency and a second frequency from a plate-shaped metal object being detected. The frequency selection unit is used to select and acquire a signal at a first frequency and a signal at a second frequency. The extraction unit is used to extract a first amplitude value under the combined electromagnetic field action containing the y and z directions through a first frequency signal; and to extract a second amplitude value under the electromagnetic field action in the x direction through a second frequency signal. The first comparison unit is used to compare the data of the first amplitude and the second amplitude in each detection area. When the data of the first amplitude is greater than the data of the second amplitude, the first judgment unit is activated. The first judgment unit is used to determine the orientation of the plate-shaped metal object parallel to the ground by the number of times the ratio of the first amplitude to the second amplitude is higher than the first threshold. Beneficial effects

[0021] The coil structure of this invention's through-type detector generates electromagnetic fields in the y and z directions through the upper and lower coils of the first transmitting line, while the second transmitting coil strengthens the electromagnetic field in the x direction. This allows a large number of magnetic field lines to pass through the maximum cross-section of the plate-shaped metal object in any of the x, y, and z directions, generating strong eddy current signals and thus improving the reliability of the coil structure in detecting plate-shaped metal objects. Furthermore, the plate-shaped metal object posture recognition method and device separates the received signals by setting different frequencies. If the amplitude data of the second frequency is greater than that of the first frequency, it is determined that the maximum cross-section of the plate-shaped metal object is parallel to the door panel. If the amplitude data of the first frequency is greater than that of the second frequency, the ratio of the amplitude data of different frequencies is used to determine whether the electromagnetic field in the y or z direction plays a major role in the first frequency amplitude data, thus determining whether the maximum cross-section of the plate-shaped metal object is parallel to the ground or parallel to the abdomen of the person being tested, achieving posture recognition of the plate-shaped metal object. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the coil structure of a through-type detector provided in Embodiment 1 of the present invention; Figure 2 This is a front view of the coil structure of a through-type detector provided in Embodiment 1 of the present invention; Figure 3 This is a top view of the coil structure of a through-type detector provided in Embodiment 1 of the present invention; Figure 4 This is a bottom view of the coil structure of a through-type detector provided in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the coil structure of a through-type detector provided in Embodiment 2 of the present invention; Figure 6 This is a schematic diagram of the structure of a plate-shaped metal object posture recognition device provided in Embodiment 5 of the present invention. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0024] The plate-shaped metal articles in each embodiment are mobile phones, tablets, copper plates, and other plate-shaped metal articles.

[0025] See Figure 1This is a schematic diagram of the coil structure of a through-type detector 3 according to Embodiment 1 of the present invention. The coil structure includes two transmitting coils 1 and 2 arranged opposite each other on both sides, forming a central channel for the passage of the object being measured. Transmitting coil 1 consists of an upper coil 111, a lower coil 112, and a transmitting coil 113. The upper coil 111 and lower coil 112 are wound in opposite directions on the same conductor. Optionally, the upper coil 111 and lower coil 112 are separate coils. The upper coil 111 and lower coil 112 operate at a first frequency, and the transmitting coil 113 operates at a second frequency. Transmitting coil 2 consists of an upper coil 211, a lower coil 212, and a transmitting coil 213. The upper coil 211 and lower coil 212 are wound in opposite directions on the same conductor. The upper coil 211 and lower coil 212 operate at the first frequency, and the transmitting coil 213 operates at the second frequency. Transmitting coil 1 and transmitting coil 2 are the same size and shape, with their centers overlapping, meaning their coil projections overlap.

[0026] The upper coil 111 and the lower coil 112 are arranged within the area enclosed by the transmitting coil 113. The upper coil 211 and the lower coil 212 are arranged within the area enclosed by the transmitting coil 213.

[0027] The normal directions of the upper coil 111 and the lower coil 112 are opposite at the same time. The normal directions of the upper coil 211 and the lower coil 212 are also opposite at the same time. The normal directions of the two upper coils 111 and 211 are opposite at the same time. The normal directions of the two lower coils 112 and 212 are also opposite at the same time. See [link / reference]. Figure 1 Solid arrows indicate that the normals to the two transmitting coils 113 and 213 are in the same direction. See [link / reference]. Figure 1 Hollow arrows indicate that the x-direction is perpendicular to the door panel, the y-direction is the direction through the middle passage, and the z-direction is perpendicular to the ground. The x, y, and z directions are perpendicular to each other.

[0028] See Figure 2 This is a front view of the coil structure of a through-type detector provided in Embodiment 1 of the present invention. Transmitting coils 111 and 211, and 112 and 212, are on the same horizontal level with opposite magnetic field lines on their left and right sides. Within the middle channel, the magnetic field lines deflect in the z-direction, thus generating a magnetic field in the z-axis direction in this region. Transmitting coils 113 and 213 are on the same horizontal level with the same magnetic field lines on their left and right sides, generating a magnetic field in the x-axis direction within the middle channel.

[0029] See Figure 3This is a top view of the coil structure of a through-type detector provided in Embodiment 1 of the present invention. The transmitting coils 111 and 211 have magnetic field lines in opposite directions on the left and right sides. In the middle channel, the magnetic field lines deflect in the y-axis direction, thus generating a magnetic field in the y-axis direction in this region.

[0030] See Figure 4 This is a bottom view of the coil structure of a through-type detector provided in Embodiment 1 of the present invention. The transmitting coils 112 and 212 have magnetic field lines in opposite directions on the left and right sides. In the middle channel, the magnetic field lines deflect in the y-axis direction, thus generating a magnetic field in the y-axis direction in this region.

[0031] When the maximum cross-section of a plate-shaped metal object passes through a large number of magnetic field lines in any of the x, y, and z directions, it can generate a strong eddy current signal, thereby improving the reliability of the coil structure in detecting plate-shaped metal objects and avoiding missed detections. The transmitting coils 111 and 112 are positioned within the area enclosed by the transmitting coil 113; this compensates for the loss of the horizontal magnetic field caused by the magnetic field compression between the upper coil 111 and the lower coil 112 due to their opposite normals, further improving the detection sensitivity of the coil structure when detecting plate-shaped metal objects parallel to the door panel.

[0032] See Figure 5 This is a schematic diagram of the coil structure of a walk-through detector provided in Embodiment 2 of the present invention. This embodiment is based on Embodiment 1, but differs in that 10 sets of receiving coils are installed inside the door panels on both sides of the walk-through detector. Each set of receiving coils has a differential structure; for example, the receiving coil in area 1 of the right door panel consists of coil R1 and coil R1'. Five sets are set on each side door panel, two sets on the upper panel and three sets on the lower panel. Each set of receiving coils receives signals of a first frequency and a second frequency. The two signals are separated by a frequency selection circuit to obtain data under the electromagnetic fields of the first and second frequencies, which can be used as data for identifying the posture of plate-shaped metal objects.

[0033] The present invention provides a method for attitude recognition of plate-shaped metal objects in embodiment 3, which uses the coil structure of the through-type detector in embodiment 2 as the implementation environment. (L1, L1', R1, R1')-(L5, L5', R5, R5') are five detection zones.

[0034] The method for recognizing the posture of plate-shaped metal objects includes the following steps: S1: Taking the data of the left door panel as an example, the receiving coil of the detection area of ​​the left door panel receives the first frequency signal and the second frequency signal of the plate-shaped metal object.

[0035] S2: Select the first frequency signal and the second frequency signal by frequency selection.

[0036] S3: Extract the second amplitude value under the action of the electromagnetic field in the x-direction using the second frequency signal.

[0037] In this step, the location of the object being measured in the third detection zone is determined by the detection zone with the largest second amplitude value detected in each of the vertically distributed detection zones. The second amplitude data of each detection zone follows a normal distribution. In this embodiment, there are five detection zones.

[0038] S4: Extract the first amplitude value under the combined electromagnetic field action in the y and z directions using the first frequency signal.

[0039] In this step, the first amplitude data of the signal in each detection zone follows a normal distribution, with the first amplitude data in the third detection zone being the largest. Optionally, the phase and stability value of the signal can also be extracted to assist in observing the attitude data of the object under test.

[0040] S5: The data of the first amplitude in each detection area is greater than the data of the second amplitude.

[0041] This step excludes the largest cross-section of the plate-shaped metal object being tested from being parallel to the door panel and perpendicular to the x-direction.

[0042] S6: The number of times the ratio of the first amplitude to the second amplitude in each detection zone is higher than the first threshold is used to determine the attitude of the plate-shaped metal object parallel to the ground.

[0043] In this step, for example

[0044] Since the third zone has the largest data among the five zones, it is sufficient to detect the two zones adjacent to the third zone. Zones 1 and 5 have little reference value and can be selectively considered. In this embodiment, they are not considered.

[0045] Second zone: A2 / B2=24 / 2=12; Third zone: A3 / B3=49 / 9=5; Fourth zone: A4 / B4=55 / 6=9. The first threshold is set to 3 (greater than 3). A ratio of the first amplitude to the second amplitude greater than 3 indicates that the first amplitude is mainly generated by the magnetic field in the z-direction. If there are 3 ratios greater than 3, the plate-shaped metal object is determined to be parallel to the ground. The number of ratios greater than 3 is above the second threshold. The value of the second threshold is set according to the number of detection zones. In this embodiment, the second threshold is set to 2. A ratio of 3 is greater than the second threshold of 2, indicating that the plate-shaped metal object is parallel to the ground. The setting of the second threshold prevents random exceptions in the data.

[0046] S7: The number of times the ratio of the first amplitude to the second amplitude is below the first threshold is used to determine the parallel posture of the plate-shaped metal object to the abdomen.

[0047] In this step, for example

[0048] Second zone: C2 / D2=11 / 4=2; Third zone: C3 / D3=37 / 12=3; Fourth zone: C4 / D4=23 / 7=3. The first threshold is set to 3 (less than or equal to 3). A ratio of the first amplitude to the second amplitude less than or equal to 3 indicates that the first amplitude is mainly generated by the magnetic field in the y-direction. If there are three ratios less than or equal to 3, the plate-shaped metal object is judged to be in a parallel abdominal posture. The number of ratios less than or equal to 3 is above the third threshold. The value of the third threshold is set according to the number of detection zones. In this embodiment, the third threshold is set to 2. If the number of ratios less than or equal to 3 (3) is higher than the third threshold (2), the plate-shaped metal object can be judged to be in a parallel abdominal posture. The setting of the second threshold prevents random exceptions in the data.

[0049] In an optional embodiment, since the data collected from the left door panel and the right door panel are corresponding and both are normally distributed, the number of ratios of the first amplitude and the second amplitude can include the number of ratios of the left door panel and the number of ratios of the right door panel.

[0050] Embodiment 4 of the present invention provides a method for attitude recognition of plate-shaped metal objects, which uses the coil structure of the through-type detector of Embodiment 2 as the implementation environment. (L1, L1', R1, R1')-(L5, L5', R5, R5') are five detection zones.

[0051] The examinee usually conceals a plate-shaped metal object in the middle of the body, such as on the abdomen or lower back. The third detection area, where L3, L3', R3, and R3' are located, is usually designed as the standard abdominal position of a human body.

[0052] The method for recognizing the posture of plate-shaped metal objects includes the following steps: S1: Taking the data of the left door panel as an example, the receiving coil of the detection area of ​​the left door panel receives the first frequency signal and the second frequency signal of the plate-shaped metal object.

[0053] S2: Select the first frequency signal and the second frequency signal by frequency selection.

[0054] S3: Extract the second amplitude value under the action of the electromagnetic field in the x-direction using the second frequency signal.

[0055] This step determines the position of the tested plate-shaped metal object within the longitudinally distributed detection zones. The second amplitude data of each detection zone follows a normal distribution. In this embodiment, there are five detection zones.

[0056] S4: Extract the first amplitude value under the combined electromagnetic field action in the y and z directions using the first frequency signal.

[0057] In this step, the initial amplitude data of the signals from each detection zone follow a normal distribution. Optionally, the phase and stability values ​​of the signals can also be extracted to assist in observing the attitude data of the object under test.

[0058] S5: If the data of the first amplitude in each detection zone is less than or equal to the data of the second amplitude, it is determined that the plate-shaped metal object is parallel to the door panel.

[0059] In this step, for example

[0060] Typically, the first amplitude value (E) is relatively small, while the second amplitude value (F) is relatively large. The data in column E is significantly less than or equal to the data in column F, thus determining that the largest cross-section of the tested plate-shaped metal object is a parallel door panel.

[0061] In an optional embodiment, since the amplitude data collected from the right door panel and the left door panel are corresponding and both are normally distributed, the method for determining whether the plate-shaped metal object is parallel to the door panel is similar. Example

[0062] The plate-shaped metal object posture recognition device includes the coil structure of the through-type detector, a signal receiving unit 510, a frequency selection unit 520, an extraction unit 530, a comparison unit 540, a judgment unit, and a display unit 560.

[0063] The signal receiving unit is used to receive signals containing a first frequency and a second frequency from the plate-shaped metal object being detected.

[0064] The frequency selection unit is used to select and acquire a signal at a first frequency and a signal at a second frequency.

[0065] The extraction unit is used to extract a first amplitude under the combined electromagnetic field action in the y and z directions via a first frequency signal; and to extract a second amplitude under the electromagnetic field action in the x direction via a second frequency signal.

[0066] The comparison unit includes a first comparison unit 541 and a second comparison unit 542.

[0067] The first comparison unit is used to compare the data of the first amplitude and the second amplitude in each detection area. When the data of the first amplitude is greater than the data of the second amplitude, the judgment unit is activated.

[0068] The second comparison unit is used to compare the data of the first amplitude and the second amplitude in each detection area. When the data of the first amplitude is less than the data of the second amplitude, the third judgment unit is activated.

[0069] The judgment unit includes a first judgment unit and a second judgment unit.

[0070] The first judgment unit 551 is used to determine the orientation of the plate-shaped metal object parallel to the ground by the number of times the ratio of the first amplitude to the second amplitude is higher than the first threshold.

[0071] The detector further includes: The second judgment unit 552 determines the parallel posture of the plate-shaped metal object to the abdomen by the number of times the ratio of the first amplitude to the second amplitude is less than or equal to the first threshold.

[0072] The third judgment unit 553 is used to determine whether the plate-shaped metal object is parallel to the door panel.

[0073] The display unit is used to display the attitude information detection results through text and / or images.

[0074] In this embodiment, the receiving unit (not shown) of the plate-shaped metal object posture recognition device receives signals. The frequency selection unit separates signals of different frequencies, and the extraction unit extracts the first frequency signal and the second frequency signal respectively, obtaining the amplitude data of the first frequency signal and the second frequency signal respectively. When the first comparison unit calculates that the first amplitude data is greater than the second amplitude data, the first judgment unit and the second judgment unit determine that the plate-shaped metal object is parallel to the ground or parallel to the abdomen; when the second comparison unit calculates that the first amplitude data is less than the second amplitude data, the third judgment unit determines that the plate-shaped metal object is parallel to the door panel. The plate-shaped metal object posture recognition device and plate-shaped metal object posture recognition method provided in the above embodiments belong to the same concept, and their specific implementation process is detailed in the method embodiment, which will not be repeated here.

[0075] It should be noted that the above is only an example of the division of functional modules of the plate-shaped metal object posture recognition device in the embodiment. In actual applications, the above functions can be assigned to different functional modules as needed.

[0076] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc.

[0077] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. Coil structure for a magnetic field probe, characterized in that It includes two opposing sets of transmitting coils, with an intermediate channel between them for the object being measured to pass through; Each side of the bilateral transmitting coil group includes a first transmitting coil and a second transmitting coil; the first transmitting coil includes an upper coil and a lower coil, and the first transmitting coil is located within the area enclosed by the second transmitting coil; The normal directions of the upper and lower coils on one side are opposite at the same time, and the normal directions of the two upper coils of the double-sided transmitting coil group are opposite at the same time; the normal directions of the second transmitting coils on both sides are in the same direction; the first transmitting coil operates at the first frequency, and the second transmitting coil operates at the second frequency.

2. The coil structure of a through-type probe according to claim 1, wherein Electromagnetic fields are formed in the three-dimensional space of the intermediate channel in the x, y, and z directions; Where x is perpendicular to the door panel, y is the direction through the middle passage, and z is perpendicular to the ground. x, y, and z are perpendicular to each other.

3. The coil structure of the through-type detector as described in claim 1, characterized in that, Several pairs of differential receiving coils are longitudinally arranged in the upper and lower coils as detection areas to receive signals of the first and second frequencies. The signals are then separated by a frequency selection circuit to obtain data under the first and second frequency electromagnetic fields.

4. The coil structure of the through-type detector as described in claim 1, characterized in that, The upper and lower coils are electrically connected.

5. The coil structure of the through-type detector as described in claim 1, characterized in that, The upper and lower coils are electrically disconnected.

6. A method for recognizing the posture of a plate-shaped metal object, employing the coil structure of the through-type detector as described in claim 1, characterized in that, The method includes A single-sided door panel with several detection zones receives the first and second frequency signals from a plate-shaped metal object using a receiving coil. Select the first frequency signal and the second frequency signal; The second amplitude value under the action of the electromagnetic field in the x-direction is extracted using the second frequency signal; The first amplitude under the combined electromagnetic field action in the y and z directions is extracted using the first frequency signal; When the data of the first amplitude in each detection zone is greater than the data of the second amplitude; The number of times the ratio of the first amplitude to the second amplitude is higher than the first threshold is used to determine the orientation of the plate-shaped metal object parallel to the ground.

7. The method for recognizing the posture of a plate-shaped metal article as described in claim 6, characterized in that, It also includes the step of determining the parallel posture of the plate-shaped metal object to the abdomen by the number of times the ratio of the first amplitude to the second amplitude is below the first threshold.

8. The method for recognizing the posture of a plate-shaped metal article as described in claim 6 or 7, characterized in that, If the number of ratios exceeds the second threshold, the plate-shaped metal object is determined to be in the corresponding posture.

9. The method for recognizing the posture of a plate-shaped metal article as described in claim 6, characterized in that, It also includes the step of: obtaining the second amplitude value of the receiving coil signal of the plurality of detection zones, which is used to determine the position of the plate-shaped metal object in the detection zone.

10. A method for recognizing the posture of a plate-shaped metal object, employing the coil structure of the through-type detector as described in claim 1, characterized in that, The method includes A single-sided door panel with several detection zones receives the first and second frequency signals from a plate-shaped metal object using a receiving coil. Select the first frequency signal and the second frequency signal; The second amplitude value under the action of the electromagnetic field in the x-direction is extracted using the second frequency signal; The first amplitude under the combined electromagnetic field action in the y and z directions is extracted using the first frequency signal; If the data of the first amplitude in each detection zone is less than the data of the second amplitude, it is determined that the plate-shaped metal object is parallel to the door panel.

11. The method for recognizing the posture of a plate-shaped metal article as described in claim 10, characterized in that, It also includes the step of: obtaining the second amplitude value of the receiving coil signal of the plurality of detection zones, which is used to determine the position of the plate-shaped metal object in the detection zone.

12. The method for recognizing the posture of a plate-shaped metal article as described in any one of claims 6-7 and 9-11, characterized in that, Also includes The posture information detection results are displayed through text and / or images.

13. A plate-shaped metal object posture recognition device, comprising the coil structure of the through-type detector as described in claim 1, characterized in that, include A signal receiving unit is used to receive signals containing a first frequency and a second frequency from a plate-shaped metal object being detected. The frequency selection unit is used to select and acquire a signal at a first frequency and a signal at a second frequency. The extraction unit is used to extract the first amplitude value under the combined electromagnetic field action containing the y and z directions through the first frequency signal; And extract the second amplitude value under the action of the electromagnetic field in the x-direction through the second frequency signal; The first comparison unit is used to compare the data of the first amplitude and the second amplitude in each detection area. When the data of the first amplitude is greater than the data of the second amplitude, the first judgment unit is activated. The first judgment unit is used to determine the orientation of the plate-shaped metal object parallel to the ground by the number of times the ratio of the first amplitude to the second amplitude is higher than the first threshold.

14. The plate-shaped metal article posture recognition device as described in claim 13, characterized in that, Also includes The second judgment unit determines the parallel posture of the plate-shaped metal object to the abdomen by the number of times the ratio of the first amplitude to the second amplitude is below the first threshold.

15. The plate-shaped metal article posture recognition device as described in claim 13, characterized in that, Also includes The second comparison unit is used to compare the data of the first amplitude and the second amplitude in each detection area. When the data of the first amplitude is less than the data of the second amplitude, the third judgment unit is activated. The third judgment unit is used to determine whether a plate-shaped metal object is parallel to the door panel.

16. The plate-shaped metal article posture recognition device as described in claim 13, characterized in that, Also includes The display unit is used to display the attitude information detection results through text and / or images.

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