Detection assembly, door plate and pass-type detection device

Abstract

The invention relates to the technical field of detection, and discloses a detection assembly, a door plate and a pass-type detection device. The detection assembly is applied to the pass-type detection device, a detection channel is formed in the pass-type detection device, and the detection assembly comprises a main frame, a nonlinear detection module and an eddy current detection module, wherein the nonlinear detection module comprises an antenna assembly, the eddy current detection module comprises a coil assembly, and the coil assembly is located on the side, opposite to the detection channel, of the antenna assembly. According to the detection assembly, a nonlinear node detection technology and an eddy current detection technology are combined, and the arrangement mode is reasonably arranged, so that the reliability of matched detection of the two detection technologies can be improved.

Description

Technical Field

[0001] The present invention relates to the field of detection technology, and more particularly to a detection component, a door panel, and a through-type detection device. Background Art

[0002] Through-type detection devices are mainly applied in public places with large crowds such as airports, railway stations, and large conferences, and are used to detect metal items hidden on the persons to be inspected.

[0003] The detection component provided in the traditional through-type detection device is an eddy current detection device based on the principle of electromagnetic induction. It generates an alternating magnetic field through a coil. When a metal object enters this magnetic field, magnetic induction lines pass through the metal object and generate eddy currents around it. The eddy currents will affect the original magnetic field, thereby triggering an alarm to achieve the detection of electronic products. In practical applications, although the above-mentioned through-type detection device can detect electronic products with good shielding functions such as mobile phones, USB flash drives with metal casings, and recording pens with metal casings to a certain extent, it is prone to false negatives for some electronic products without metal casings with non-linear nodes. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a detection component, a door panel, and a through-type detection device. The detection component combines non-linear node detection technology and eddy current detection technology, and reasonably sets the arrangement method, so as to improve the reliability of the combined detection of the two detection technologies.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A first aspect of an embodiment of the present application provides a detection component, which is applied to a through-type detection device. A detection channel is formed inside the through-type detection device. The detection component includes a main frame and a non-linear detection module and an eddy current detection module arranged in the main frame;

[0007] Wherein, the non-linear detection module includes an antenna component, and the eddy current detection module includes a coil component. The coil component is located on a side of the antenna component facing away from the detection channel.

[0008] In one embodiment, the antenna component includes a first mounting plate and at least one group of antenna units. The first mounting plate is arranged in the main frame, and the antenna units are arranged on a first side of the first mounting plate facing the detection channel.

[0009] In one embodiment, multiple groups of antenna units are provided, and the multiple groups of antenna units are arranged at intervals along the height direction of the first mounting plate.

[0010] In one embodiment, the antenna assembly includes an antenna unit, and the detection assembly includes an absorbing layer, and the absorbing layer is located between the antenna unit and the coil assembly.

[0011] In one embodiment, the detection assembly includes a graphite layer.

[0012] In one embodiment, the antenna assembly includes an antenna unit; the detection assembly includes an absorbing layer, and the absorbing layer, the graphite layer and the antenna unit are arranged in sequence in the order from far to near the detection channel.

[0013] In one embodiment, the coil assembly includes a second mounting plate, a transmitting coil and a receiving coil. The second mounting plate is disposed in the main frame, and the transmitting coil and the receiving coil are respectively disposed on opposite sides of the second mounting plate.

[0014] In one embodiment, the receiving coil is disposed on the third side of the second mounting plate facing the detection channel, and the transmitting coil is disposed on the fourth side of the second mounting plate facing away from the detection channel.

[0015] In one embodiment, the non-linear detection module further includes a radio frequency component. The radio frequency component includes a shielding member and at least one group of non-linear node detection units. The shielding member is disposed in the main frame, and the non-linear node detection units are disposed inside the shielding member and are electrically connected to the antenna unit correspondingly; the coil assembly is located between the radio frequency component and the antenna assembly.

[0016] A second aspect of the embodiments of the present application provides a door panel, including the detection assembly described in any one of the above.

[0017] A third aspect of the embodiments of the present application provides a passing detection device, including the door panel described above.

[0018] In the detection assembly provided by the embodiments of the present application, the coil assembly is located on the side of the antenna assembly facing away from the detection channel. The fundamental wave emitted by the antenna assembly can directly reach the detection channel without being blocked or interfered by the protective layer (such as the graphite layer) contained in the coil assembly itself. That is, in the embodiments of the present application, the coil assembly is located on the rear side of the signal emission direction of the antenna assembly, and the coil assembly will not affect the antenna assembly. In addition, as long as the eddy current detection module can detect the change of the original magnetic field, the detection can be realized. Therefore, setting the coil assembly on the side of the antenna assembly facing away from the detection channel will not affect its detection performance. Therefore, when the detection assembly is working, the non-linear detection module and the eddy current detection module can simultaneously detect the target passing through the detection channel, and by reasonably setting the arrangement mode, the reliability of the combined detection of the two detection technologies is improved. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on the provided accompanying drawings.

[0020] Figure 1 Structural schematic diagram of a passing detection device provided by an embodiment of the present invention;

[0021] Figure 2 Structural schematic diagram of the left door panel in the passing detection device provided by an embodiment of the present invention;

[0022] Figure 3 For Figure 2 Exploded view of the door panel shown in

[0023] Figure 4 For Figure 3 First perspective of the exploded view of the detection component of the door panel shown in

[0024] Figure 5 For Figure 3 Second perspective of the exploded view of the detection component shown in

[0025] Figure 6 Structural schematic diagram of the right door panel in the passing detection device provided by an embodiment of the present invention;

[0026] Figure 7 For Figure 6 Exploded view of the door panel shown in

[0027] Figure 8 For Figure 6 Exploded view of the detection component of the door panel shown in

[0028] Figure 9 Structural schematic diagram of the coil assembly in the eddy current detection module provided by an embodiment of the present invention;

[0029] Figure 10 Structural schematic diagram of the antenna assembly in the non-linear node detection module provided by an embodiment of the present invention;

[0030] Figure 11 Exploded schematic diagram of the radio frequency component in the non-linear node detection module provided by an embodiment of the present invention;

[0031] Figure 12 Schematic diagram of the connection relationship of the wave-absorbing layer, graphite layer and the second mounting plate provided by an embodiment of the present invention.

[0032] Reference Signs:

[0033] 01, door panel; 02, central controller; 03, detection component; 04, detection channel;

[0034] 1, main frame; 11, mounting member;

[0035] 2, non - linear detection module; 21, antenna assembly; 211, first mounting plate; 211a, first side; 211b, second side; 212, antenna unit; 2121, first - order transmitting antenna; 2122, second - order receiving antenna; 2123, third - order receiving antenna; 22, RF component; 221, shielding member; 222, non - linear node detection unit; 2211, first shielding plate; 2212, second shielding plate;

[0036] 3, eddy current detection module; 31, coil assembly; 311, second mounting plate; 311a, third side; 311b, fourth side; 312, transmitting coil; 313, receiving coil;

[0037] 4, wave - absorbing layer; 5, graphite layer;

[0038] 6, first cover plate;

[0039] 7, second cover plate. Detailed Embodiment

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] The present invention provides a detection component, a door panel, and a through - type detection device. The detection component combines non - linear node detection technology and eddy current detection technology, and reasonably arranges the layout, so as to improve the reliability of the combined detection of the two detection technologies.

[0042] It should be noted that in this embodiment, the orientation or positional relationship indicated by "up", "down", "front", "back", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0043] Please refer to Figure 4 、 Figure 5, an embodiment of the present invention provides a detection component 03, which is applied to a through-type detection device. The through-type detection device is as shown in Figure 1 For example, the through-type detection device may include two door panels 01 (taking the perspective shown in Figure 1 as an example, including the left door panel 01 and the right door panel 01), and a detection channel 04 is formed inside the through-type detection device (i.e., between the two door panels 01). The detection component 03 can be installed in each side door panel 01. Among them, the detection component 03 can be installed in the left door panel 01 of the through-type detection device in the posture corresponding to the perspective shown in Figure 4 , and the overall structural schematic diagram of the left door panel 01 after installation is as shown in Figure 2 . The detection component 03 can be installed in the right door panel 01 of the through-type detection device in the postures corresponding to the perspectives shown in Figure 7 and Figure 8 , and the overall structural schematic diagram of the right door panel 01 after installation is as shown in Figure 6 . The detection component 03 may include a main frame 1 and a non-linear detection module 2 and an eddy current detection module 3 provided in the main frame 1.

[0044] It should be noted that Figure 2 and Figure 6 In the actual application scenario of the door panel 01 described above, the top and the side can both be provided with plate bodies so that the entire door panel 01 is a closed structure. However, the plate bodies at the top and the side have no relation to the improvement solution of the present invention. Therefore, in order to facilitate the manifestation of the connection relationship between the main frame 1 and the other components, Figure 2 and Figure 6 The plate bodies at the top and the side of the door panel 01 shown in are hidden.

[0045] Among them, the non-linear detection module 2 may include an antenna assembly 21, and the eddy current detection module 3 may include a coil assembly 31. The coil assembly 31 is located on the side of the antenna assembly 21 facing away from the detection channel 04. That is, in the embodiment of the present application, the coil assembly 31 is located at the rear side in the signal emission direction of the antenna assembly 21. In other words, the antenna assembly 21 is closer to the detection channel 04 than the coil assembly 31. For example: assuming that the detection component 03 is located in the left door panel 01 of the through-type detection device in the perspective shown in Figure 1 , then the coil assembly 31 is located on the left side of the antenna assembly 21, and the detection channel 04 is located on the right side of the antenna assembly 21.

[0046] It should be noted that the non-linear detection module 2 uses non-linear node detection technology to detect electronic devices. It includes an antenna assembly 21. The antenna assembly 21 can transmit a fundamental wave to the detection channel 04 and receive the second harmonic and / or third harmonic that may be generated by the target object passing through the detection channel 04. After analyzing the harmonics, the non-linear detection module 2 (such as a processor) can identify whether the target object is an electronic device with non-linear nodes, thus realizing non-linear detection. Among them, for the specific analysis method, reference can be made to the existing technology of non-linear node detection. For example, by comparing whether the amplitude of the harmonic is greater than a set threshold. If so, it is determined that there are non-linear nodes.

[0047] The eddy current detection module 3 uses eddy current detection technology to detect electronic devices. It includes a coil assembly 31. When an alternating current is passed through the transmitting coil of the coil assembly 31, an alternating magnetic field (original magnetic field) can be generated. At this time, there is no induced voltage in the receiving coil of the coil assembly 31. When the target object is a conductive component (such as metal), an induced current will be generated in the component under the action of the original magnetic field. The magnetic field generated by the induced current will interact with the original magnetic field, causing the original magnetic field to change. At this time, the receiving coil can output an induced voltage, that is, the coil assembly 31 can detect the change in the original magnetic field. The eddy current detection module 3 processes and analyzes the induced voltage output by the coil assembly 31, and can realize the detection of metal components or electronic devices with metal casings, etc. Among them, for the specific analysis method of eddy current detection, reference can be made to the existing technology of security gates. For example, the induction signal is subjected to frequency domain conversion, and the amplitude and phase are extracted. If both the amplitude and phase meet the value range of a certain type of metal object, it is considered that there is a metal object.

[0048] It should also be noted that in traditional eddy current detection modules on the market, the coil assembly usually has a protective layer (such as a graphite layer). The protective layer can effectively suppress external electromagnetic interference and at the same time reduce the leakage of the magnetic field of the coil assembly itself, avoiding affecting the surrounding electronic devices. However, if the coil assembly is placed in front of the antenna assembly, the protective layer will attenuate the power of the fundamental wave transmitted by the antenna assembly and the harmonic received, thus affecting the reliability of non-linear detection.

[0049] Therefore, in the detection component 03 provided by the embodiment of the present invention, the coil component 31 is located on the side of the antenna component 21 facing away from the detection channel 04. The fundamental wave emitted by the antenna component 21 can directly reach the detection channel 04, and the harmonic wave will also directly reach the antenna component 21 without being blocked or interfered by the protective layer (such as a graphite layer) contained in the coil component 31 itself. That is, in the embodiment of the present application, the coil component 31 is not located on the signal transmission path of the antenna component 21, and the protective layer of the coil component 31 will not affect the signals transmitted and received by the antenna component 21. Moreover, as long as the eddy current detection module 3 can detect a change in the original magnetic field to achieve detection, setting the coil component 31 on the side of the antenna component 21 facing away from the detection channel 04 will not affect its detection performance. In addition, since the operating frequency band of the antenna component 21 (the frequency bands where the fundamental wave, second harmonic, and third harmonic are located) in the non-linear detection module 2 is relatively high, and the operating frequency band of the coil component 31 (the frequency band of the driving signal of the transmitting coil, the frequency band of the induced voltage) is relatively low, there is no intersection between the two operating frequency bands, so the two will not interfere with each other.

[0050] Therefore, when the detection component 03 is working, the non-linear detection module 2 and the eddy current detection module 3 can simultaneously detect the target object passing through the detection channel 04, and will not affect each other in terms of signal reception and signal transmission. By reasonably setting the arrangement method, the reliability of the combined detection of the two detection technologies is improved.

[0051] Considering the specific setting of the antenna component 21, on the basis of the above embodiment, please refer to Figure 4 and Figure 10 , the antenna component 21 may include a first mounting plate 211 and at least one set of antenna units 212. The first mounting plate 211 is disposed in the main frame 1, and the antenna units 212 are disposed on the first side surface 211a of the first mounting plate 211 facing the detection channel 04.

[0052] Specifically, the function of each set of antenna units 212 is to emit the fundamental wave and receive the second harmonic and third harmonic. All the antenna units 212 may be disposed on the first side surface 211a of the first mounting plate 211 facing the detection channel 04 to achieve the fixed installation of the antenna units 212. At the same time, when the antenna units 212 emit the fundamental wave and receive the second harmonic and third harmonic, the fundamental wave, second harmonic, and third harmonic will not be blocked by the first mounting plate 211, that is, the transmission and reception operations of the antenna units 212 will not be affected by the first mounting plate 211.

[0053] In some embodiments of the present application, please refer to Figure 10, the antenna unit 212 may include a first-order transmitting antenna 2121, a second-order receiving antenna 2122, and a third-order receiving antenna 2123. The first-order transmitting antenna 2121 is used to transmit a fundamental wave into the detection channel 04, such as an electromagnetic wave with a frequency of 3.4 - 3.6 GHz. The second-order receiving antenna 2122 is used to receive the second harmonic generated by the target object based on the fundamental wave, such as an electromagnetic wave with a frequency of 7 - 7.5 GHz. The third-order transmitting antenna is used to receive the third harmonic generated by the target object based on the fundamental wave, such as an electromagnetic wave with a frequency of 10 - 10.6 GHz.

[0054] Considering the specific setting of the antenna unit 212, on the basis of the above embodiments, please refer to Figure 10 , the number of the antenna units 212 can be set to multiple groups, and the groups of antenna units 212 are arranged at intervals along the height direction of the first mounting plate 211. For example Figure 10 As shown, there are a total of 5 groups of antenna units 212, and there is a certain interval between adjacent two groups of antenna units 212.

[0055] It can be understood that the first mounting plate 211 is arranged in the door panel 01 along the height direction of the door panel 01 (i.e., the gravity direction), that is, the first mounting plate 211 is arranged along the height direction of the detection channel 04. And, the groups of antenna units 212 can be arranged at intervals along the height direction of the first mounting plate 211, that is, different antenna units 212 correspond to different detection areas along the gravity direction, so as to increase the detection area of the detection channel 04 along the gravity direction, and can minimize the area of the detection blind area as much as possible and reduce the missed detection rate.

[0056] It should be particularly pointed out that some of the fundamental waves emitted by the antenna unit 212 may be radiated backward (i.e., generate back lobes). When this part of the fundamental wave radiates to other components at the rear end, such as the radio frequency component 22, the nonlinear nodes inside it will also generate harmonics under the influence of the fundamental wave, and this part of the harmonics may also be detected by the nonlinear detection module 2, which may lead to misjudgment. Therefore, the phenomenon that some of the fundamental waves are radiated backward will affect the detection effect of the nonlinear detection module 2. In addition, when both the first mounting plate 211 and the main frame 1 are metal components, the first mounting plate 211 is in contact with one or more mounting points on the main frame 1. And the inventor measured through a large number of experiments that the lap joint of two metal components may also generate harmonics under the influence of the fundamental wave, resulting in false alarms.

[0057] In order to avoid a high false alarm rate of the nonlinear detection module 2 caused by the backward radiation of the fundamental wave emitted by the antenna unit 212. On the basis of the above embodiments, please refer to Figure 12 , in an embodiment of the present invention, the antenna assembly 21 may further include the antenna unit 212. The detection assembly 03 includes an absorbing layer 4, and the absorbing layer 4 is located between the antenna unit 212 and the coil assembly 31.

[0058] Specifically, the wave-absorbing layer 4 can be made of a material that absorbs high-frequency electromagnetic waves. For example, the wave-absorbing layer 4 can at least absorb electromagnetic waves with a frequency band greater than the fundamental wave frequency band and electromagnetic waves with a frequency band equal to the fundamental wave frequency band. In this way, the wave-absorbing layer 4 can absorb the fundamental wave radiated backward by at least one set of antenna units 212 on the first mounting plate 211, so as to prevent the back lobe of the fundamental wave from radiating to the components with non-linear nodes or metal lap joints inside the door panel 01 and generating harmonics, thereby avoiding affecting the non-linear detection module 2 and reducing the false alarm rate.

[0059] In addition, for a through-type detection device, generally two door panels 01 are provided. The above-mentioned detection component 03 can be arranged in one of the door panels 01, or the above-mentioned detection component 03 can be arranged in both door panels 01. For the application scenario where the detection component 03 is arranged in both door panels 01, when the two door panels 01 work simultaneously, the antenna units 212 in the left door panel 01 will also emit the fundamental wave towards the detection channel 04, and the radiation direction of the main lobe of this part of the fundamental wave is directly towards the right door panel 01. If the wave-absorbing layer 4 is not arranged in the right door panel 01, the fundamental wave emitted by the left door panel 01 may also reach the right door panel 01 and generate harmonics at the components with non-linear nodes or metal lap joints inside the right door panel 01, resulting in false alarms.

[0060] Therefore, for the wave-absorbing layer 4 in the door panel 01, it can not only absorb the back lobe of the fundamental wave emitted by the antenna units 212 inside its own door panel 01, but also absorb the main lobe of the fundamental wave emitted by the antenna units 212 in the opposite door panel 01, thereby reducing the influence on the non-linear detection module 2 in each door panel 01.

[0061] Furthermore, the wave-absorbing layer 4 can absorb high-frequency electromagnetic waves, and can not only absorb the back lobe of the fundamental wave, but also absorb the second and third harmonics to a certain extent. Therefore, even if harmonics are generated at the components with non-linear nodes or metal lap joints inside the door panel 01 due to the back lobe of the fundamental wave, these harmonics will be absorbed by the wave-absorbing layer 4 when radiating outward and will not radiate to the antenna units 212, thereby reducing the false alarm rate.

[0062] In a specific embodiment, the wave-absorbing layer 4 extends along the height direction of the first mounting plate 211 and completely covers the second side surface 211b of the first mounting plate 211. Thus, the wave-absorbing layer 4 can absorb the fundamental wave radiated backward by any set of antenna units 212 on the first mounting plate 211, so as to prevent the back lobe of the fundamental wave from radiating to the components with non-linear nodes or metal lap joints inside the door panel and generating harmonics, thereby avoiding affecting the non-linear detection module 2 and reducing the false alarm rate.

[0063] In another specific embodiment, the wave-absorbing layer 4 can also be disposed opposite to a specific area on the first side surface 211b of the first mounting plate 211. The specific area includes one or more antenna units 212 and corresponds to the common positions where pedestrians may hide suspicious electronic devices. In other words, the wave-absorbing layer 4 can also be disposed only at key parts. In this way, on the one hand, the fundamental waves radiated backward by the antenna units 212 located in the set area (such as the key area) can be absorbed to avoid false alarms of the non-linear detection module 2. On the other hand, the material used for the wave-absorbing layer 4 can be reduced, and the cost can be lowered. In a specific embodiment, the wave-absorbing layer 4 is made of a wave-absorbing material that can absorb high-frequency electromagnetic waves.

[0064] Exemplarily, the wave-absorbing layer 4 can be a coating made by compounding a soft magnetic material and a plastic (such as polyurethane). The soft magnetic material can include iron, silicon, aluminum, copper, etc.

[0065] It should be noted that the operating frequency band of the non-linear detection module 2 is relatively high, while the operating frequency band of the coil assembly 31 in the eddy current detection module 3 is relatively low, and there is no intersection between the two operating frequency bands. Therefore, the wave-absorbing layer 4 will not interfere with the operation of the coil assembly 31. In addition, as long as the coil assembly 31 in the eddy current detection module 3 can detect a change in the original magnetic field, the detection can be achieved. Therefore, the wave-absorbing layer 4 will not interfere with the detection of the coil assembly 31. Therefore, the wave-absorbing layer 4 will not affect the detection accuracy of the eddy current detection module 3.

[0066] In a specific embodiment, please refer to Figure 12 , the detection component 03 can include a graphite layer 5. The eddy current detection module 3 can use the graphite layer 5 as a protective layer. When the detection channel 04 passes through a non-target object, the graphite layer 5 can prevent the eddy current detection module 3 from responding, thereby reducing the false alarm rate of the eddy current detection module 3.

[0067] In a specific embodiment, please refer to Figure 12 , the detection component 03 includes a graphite layer 5 and a wave-absorbing layer 4. The antenna assembly 21 includes antenna units 212. The wave-absorbing layer 4, the graphite layer 5, and the antenna units 212 can be arranged in sequence from far to near the detection channel 04.

[0068] Specifically, the graphite layer 5 covers the second side surface 211b of the first mounting plate 211 and is located behind the antenna unit 212 in the fundamental wave emission direction. The wave-absorbing layer 4 covers the graphite layer 5 and is located on the side of the coil assembly 31 facing the first mounting plate 211. It can be understood that if the graphite layer 5 is arranged in front of the antenna unit 212 in the beam emission direction, the power of the electromagnetic wave emitted by the antenna unit 212 will be attenuated, which will affect the emission of the antenna unit 212. Therefore, in the embodiment of the present application, the graphite layer 5 is arranged behind the antenna unit 212, which will not affect the fundamental wave emitted by the antenna unit 212. In addition, the graphite layer 5 is arranged before the wave-absorbing layer 4. The fundamental wave radiated backward by the antenna unit 212 can be attenuated by the graphite layer 5 first and then absorbed by the wave-absorbing layer 4. Thus, the effect of the wave-absorbing layer 4 in shielding electromagnetic waves can be greatly improved, and the false alarm rate of the non-linear detection module 2 can be further reduced.

[0069] In another specific embodiment, the wave-absorbing layer 4 and the graphite layer 5 can also be arranged in sequence in the order from near to far from the distance detection channel 04.

[0070] In some embodiments, as Figure 4 、 Figure 5 and Figure 11 shown, the non-linear detection module 2 may further include a radio frequency component 22. The radio frequency component 22 may include a shielding member 221 and at least one group of non-linear node detection units 222. The shielding member 221 is arranged in the main frame 1, and the non-linear node detection units 222 are arranged inside the shielding member 221 and are electrically connected to the antenna unit 212 correspondingly. The non-linear node detection unit 222 is used to generate a fundamental wave source and transmit it to the transmitting antenna of the antenna assembly 21 to emit a fundamental wave based on the fundamental wave source.

[0071] The non-linear node detection unit 222 is arranged in the shielding member 221. The shielding member 221 has an electromagnetic shielding effect. Since some components inside the radio frequency component 22 also have non-linear nodes, the shielding member 221 can block the back lobe of the fundamental wave emitted by the antenna unit 212, avoid the response of some components inside the radio frequency component 22, and reduce the false alarm rate of the non-linear detection module 2.

[0072] Furthermore, for the application scenario where the detection components 03 are arranged on both side doors 01 of the above-mentioned through-type detection device, the shielding member 221 inside one side door 01 can also block the main lobe of the fundamental wave emitted by the antenna unit 212 in the other side door 01.

[0073] In addition, the shielding member 221 can also prevent external electromagnetic interference signals from affecting the internal circuit of the non-linear node detection unit 222, and at the same time prevent the electromagnetic radiation generated by the non-linear node detection unit 222 from leaking into the external environment and interfering with other surrounding electronic devices or systems.

[0074] In a specific embodiment, please refer to Figure 11 , the shielding member 221 may include a first shielding plate 2211 and a second shielding plate 2212. The first shielding plate 2211 and the second shielding plate 2212 face each other and are buckled to form a cover body, and a chamber is provided inside the cover body. The non-linear node detection unit 222 is disposed in the chamber to effectively prevent the influence of external electromagnetic waves on the internal circuit of the non-linear node detection unit 222.

[0075] Optionally, both the first shielding plate 2211 and the second shielding plate 2212 are made of aluminum plates, and the aluminum plates can effectively shield electromagnetic waves. Of course, according to actual needs, the two shielding plates can also be shielding plates made of other materials, such as copper plates, steel plates, and other types of metal plates, etc., which are not unique.

[0076] It should be noted that the shielding member 221 itself has an electromagnetic shielding function and is usually made of a metal material. If the shielding member 221 is placed between the coil assembly 31 and the antenna assembly 21, the shielding member 221 may also generate eddy currents under the action of the eddy current detection module 3, thereby causing an incorrect induction signal and a false alarm, which will interfere with the detection effect of the coil assembly 31.

[0077] Therefore, please refer to Figure 4 and Figure 5 , the coil assembly 31 is located between the radio frequency assembly 22 and the antenna assembly 21, that is, the radio frequency assembly 22 is disposed on the side of the coil assembly 31 facing away from the detection channel 04. That is to say, compared with the coil assembly 31 and the antenna assembly 21, the radio frequency assembly 22 is set farther away from the detection channel 04 to avoid affecting the detection effect of the coil assembly 31, reduce the false alarm rate, and ensure the detection accuracy at the same time.

[0078] In some embodiments of the present application, refer to Figure 10 and Figure 11, the number of non-linear node detection units 222 is the same as that of antenna units 212, and they are arranged in one-to-one correspondence (that is, one non-linear node detection unit 222 is electrically connected to one antenna unit 212). Thus, it is convenient for the routing between the non-linear node detection unit 222 and its corresponding antenna unit 212 and to achieve signal connection, and it can ensure that the routing layout is clear and tidy. Among them, the non-linear node detection unit 222 is electrically connected to the first-order transmitting antenna 2121, the second-order receiving antenna 2122, and the third-order receiving antenna 2123 in the antenna unit 212. Thus, the non-linear node detection unit 222 generates a fundamental wave source. After the fundamental wave source reaches the first-order transmitting antenna 2121, the first-order transmitting antenna 2121 generates a fundamental wave and transmits the fundamental wave into the detection channel 04 to detect the target object. If the target object carries an electronic device with a non-linear node or having the characteristics of a non-linear node, the second-order receiving antenna 2122 will receive the second harmonic corresponding to the fundamental wave, and the third-order receiving antenna 2123 will receive the third harmonic corresponding to the fundamental wave and transmit them to the non-linear node detection unit 222. The non-linear node detection unit 222 performs signal analysis and outputs the result, or transmits the signal to the control module (for example, it can be Figure 1 the central controller 02 in

[0079] Considering the specific setting of the coil assembly, on the basis of any of the above embodiments, please refer to Figure 4 Figure 5 and Figure 9 , the coil assembly 31 includes a second mounting plate 311, a transmitting coil 312, and a receiving coil 313. The second mounting plate 311 is arranged in the main frame 1, and the transmitting coil 312 and the receiving coil 313 are respectively arranged on opposite sides of the second mounting plate 311.

[0080] Among them, after an alternating current is passed through the transmitting coil 312, an alternating magnetic field will be generated. The receiving coil 313 is used to sense the change of the alternating magnetic field and generate an induced signal (such as an induced voltage) when the magnetic field changes. When there is no target object with conductive properties in the detection channel 04, there is no induced voltage in the receiving coil 313; when there is a target object with conductive properties in the detection channel 04, the eddy current excited by the target object will change the initial state of the receiving coil 313. At this time, the output end of the receiving coil 313 will output an induced voltage, indicating that a target object has appeared in the detection channel 04, thereby realizing the detection of metal components or electronic devices with good shielding.

[0081] In a specific embodiment, please refer to Figure 4 and Figure 5, the receiving coil 313 is disposed on the third side surface 311a of the second mounting plate 311 facing the detection channel 04, and the transmitting coil 312 is disposed on the fourth side surface 311b of the second mounting plate 311 facing away from the detection channel 04. In this way, the receiving coil 313 is closer to the detection channel 04 than the transmitting coil 312. The receiving coil 313 can receive a stronger magnetic field and has a shorter receiving distance, thereby improving the detection sensitivity of the coil assembly 31 and reducing the false alarm rate.

[0082] In a specific embodiment, both the transmitting coil 312 and the receiving coil 313 are provided as multiple coils. The electromagnetic waves emitted by the multiple transmitting coils 312 can generate an alternating magnetic field with a wider coverage area, and the multiple receiving coils 313 can ensure the reception of electromagnetic waves at any position of the alternating magnetic field, thereby further improving the detection sensitivity of the coil assembly 31 and reducing the false alarm rate.

[0083] Considering the specific structure of the main frame 1, on the basis of the above embodiment, please refer to Figure 3 and Figure 4 , the main frame 1 is a rectangular frame, and the rectangular frame is provided with a hollow structure penetrating in the thickness direction. The shielding member 221, the second mounting plate 311, and the first mounting plate 211 are arranged in the hollow structure in the order from far to near the detection channel 04 to realize the fixed installation of the nonlinear detection module 2 and the eddy current detection module 3.

[0084] It should be noted that as Figure 8 shown, a plurality of mounting members 11 arranged at intervals in the height direction of the main frame 1 can be provided inside the hollow structure. The mounting members 11 are used to connect the shielding member 221, the second mounting plate 311, and the first mounting plate 211.

[0085] Optionally, the mounting member 11 can include a card strip structure, and the card strip structure is provided with a buckle for clamping the shielding member 221, the second mounting plate 311, and the first mounting plate 211.

[0086] Of course, the mounting member can also adopt a plate-like structure, and connection methods such as adhesives, bolts, or welding are used to connect the shielding member 221, the second mounting plate 311, and the first mounting plate 211 to the mounting member.

[0087] Optionally, please refer to Figure 3 , a first cover plate 6 is covered on one side of the main frame 1 facing away from the detection channel 04, and a second cover plate 7 is covered on one side of the main frame 1 facing the detection channel 04 to encapsulate the main frame 1 and prevent the nonlinear detection module 2 and the eddy current detection module from being affected by the external environment.

[0088] Optionally, both the first cover plate 6 and the second cover plate 7 are made of wood. The material of the wood is light, which can meet the lightweight requirements of the product.

[0089] Please refer to Figure 2 , an embodiment of the present invention provides a door panel 01, which includes the detection component 03 disclosed in the above embodiment. The detection component 03 is disposed in the door panel 01 along the height direction of the door panel 01, that is, both the detection component 03 and the door panel 01 are vertically placed. The door panel 01 can be the door panel 01 on either side of the through-type detection device.

[0090] Please refer to Figure 1 , an embodiment of the present invention provides a through-type detection device, which includes the above door panel 01.

[0091] In a specific embodiment, a pair of door panels 01 (such as the left door panel 01 and the right door panel 01) are disposed opposite to each other and at intervals, and the through-type detection device may further include a central controller 02. The central controller 02 is disposed between the tops of the pair of door panels 01 and is electrically connected to the non-linear detection module 2 and the eddy current detection module 3 respectively, so as to receive the signals fed back by the non-linear detection module 2 and the eddy current detection module 3, and output a detection result after signal analysis or directly output a detection result. Among them, the two door panels 01 and the central controller 02 jointly enclose the above detection channel 04.

[0092] The through-type detection device provided in the embodiment of the present application can be placed in places that require security checks, such as schools, subway stations, airports, and station ticket gates. When the through-type detection device provided in the above embodiment is working, a detection channel 04 is formed between the two door panels 01. When a pedestrian passes through the detection channel 04, the antenna assembly 21 in the non-linear detection module 2 in the door panel 01 emits a fundamental wave to the detection channel 04, and receives the second harmonic or third harmonic that may be generated by the items carried by the pedestrian, and then analyzes these signals, and transmits the processing result to the central controller 02, or directly sends the received signal to the central controller 02 for signal analysis, and finally outputs a detection result to confirm whether the item is an electronic device with non-linear nodes, so as to achieve non-linear detection. At the same time, the coil assembly 31 in the eddy current detection module 3 in the door panel 01 generates an alternating magnetic field. When the item carried by the pedestrian is a target object with conductive properties, an induced current will be generated in the electronic device under the action of the original magnetic field, and the magnetic field generated by the induced current interacts with the original magnetic field, and the receiving coil 313 will output an induced voltage to the central controller 02, and the central controller 02 outputs a detection result of the target object carried by the pedestrian, so as to achieve eddy current detection. And, the coil assembly 31 is located on the side of the antenna assembly 21 facing away from the detection channel 04. When the antenna assembly 21 emits a fundamental wave, it can directly reach the detection channel 04 without being blocked or interfered by the protective layer (such as a graphite layer) included in the coil assembly 31 itself.

[0093] Therefore, the in-line detection device combines the non-linear junction detection technology and the eddy current detection technology, and reasonably sets the arrangement mode, so as to improve the reliability of the combined detection of the two detection technologies.

[0094] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0095] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0096] The above has introduced in detail a detection component, a door panel and an in-line detection device provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A detection component (03), applied to a through-type detection device, wherein a detection channel (04) is formed inside the through-type detection device, and is characterized in that, The detection component includes a main frame (1), a non-linear detection module (2) and an eddy current detection module (3) arranged in the main frame (1); Among them, the non-linear detection module (2) includes an antenna component (21), the eddy current detection module (3) includes a coil component (31), and the coil component (31) is located on one side of the antenna component (21) facing away from the detection channel (04).

2. The detection component (03) according to claim 1, characterized in that, The antenna component (21) includes a first mounting plate (211) and at least one group of antenna units (212). The first mounting plate (211) is arranged in the main frame (1), and the antenna units (212) are arranged on the first side surface (211a) of the first mounting plate (211) facing the detection channel (04).

3. The detection component (03) according to claim 2, characterized in that, The antenna units (212) are arranged in multiple groups, and the multiple groups of antenna units (212) are arranged at intervals along the height direction of the first mounting plate (211).

4. The detection component (03) according to claim 1, characterized in that, The antenna component (21) includes an antenna unit (212), the detection component (03) includes an absorbing layer (4), and the absorbing layer (4) is located between the antenna unit (212) and the coil component (31).

5. The detection component (03) according to claim 1, characterized in that, The detection component (03) includes a graphite layer (5).

6. The detection component (03) according to claim 5, characterized in that, The antenna component (21) includes an antenna unit (212), the detection component (03) includes an absorbing layer (4), and the absorbing layer (4), the graphite layer (5) and the antenna unit (212) are arranged in sequence in the order from far to near from the detection channel (04).

7. The detection component (03) according to claim 1, characterized in that The coil component (31) includes a second mounting plate (311), a transmitting coil (312) and a receiving coil (313). The second mounting plate (311) is arranged in the main frame (1), and the transmitting coil (312) and the receiving coil (313) are respectively arranged on opposite sides of the second mounting plate (311).

8. The detection component (03) according to claim 7, characterized in that, The receiving coil (313) is arranged on the third side surface (311a) of the second mounting plate (311) facing the detection channel (04), and the transmitting coil (312) is arranged on the fourth side surface (311b) of the second mounting plate (311) facing away from the detection channel (04).

9. The detection component (03) according to claim 2, characterized in that The non-linear detection module (2) further includes a radio frequency component (22). The radio frequency component (22) includes a shielding member (221) and at least one group of non-linear node detection units (222). The shielding member (221) is arranged in the main frame (1), and the non-linear node detection units (222) are arranged inside the shielding member (221) and are correspondingly electrically connected to the antenna units (212); The coil component (31) is located between the radio frequency component (22) and the antenna component (21).

10. A door panel (01), characterized in that, Including the detection component (03) according to any one of claims 1 to 9.

11. A passing-through detection device, characterized in that, Including the door panel (01) according to claim 10.

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