Detection assembly, door plate and pass-type detection device

Abstract

The utility model 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, the pass-type detection device comprises door plates located on the two sides, a detection channel is formed between the door plates on the two sides, and the detection assembly can be installed in each door plate of the pass-type detection device. The detection assembly comprises a main frame, and a nonlinear detection module and an eddy current detection module which are arranged in the main frame; 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 utility model relates to the detection technical field more specifically, relate to a kind of detection assembly, door panel and through type detection device. BACKGROUND

[0002] Through type detection device is mainly applied in airport, station, large meeting and the public place of more people flow, for detecting the metal article hidden on the body of examinee.

[0003] The detection assembly arranged in the traditional through type detection device is eddy current detection device based on electromagnetic induction principle, which generates an alternating magnetic field through coil, when metal object enters the magnetic field, magnetic induction line passes through metal object and generates eddy current around it, and eddy current will affect the original magnetic field, thereby triggering alarm to realize the detection of electronic product. In practical application, the above-mentioned through type detection device can detect mobile phone, U disk with metal shell and recording pen with metal shell and other electronic products with good shielding function to a certain extent, but it is easy to miss report for some electronic products without metal shell with nonlinear node. UTILITY MODEL CONTENT

[0004] Therefore, the utility model aims at providing a kind of detection assembly, door panel and through type detection device, which combines nonlinear node detection technology and eddy current detection technology, and reasonably sets up arrangement mode, so as to improve the reliability of two detection technologies.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] The first aspect of the application provides a kind of detection assembly, applied to through type detection device, the through type detection device includes door panel in both sides, and the door panel between both sides is detection channel, and the detection assembly can be installed in each side door panel of the through type detection device;The detection assembly includes main frame and nonlinear detection module and eddy current detection module arranged in the main frame;

[0007] Wherein, the nonlinear detection module includes antenna assembly, and the eddy current detection module includes coil assembly, and the coil assembly is located at the side of the antenna assembly away from the detection channel.

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

[0009] In one of the embodiments, the antenna units are arranged in multiple groups, and the multiple groups of the antenna units are arranged in a spaced manner along a height direction of the first mounting plate.

[0010] In one of the embodiments, the antenna assembly comprises the antenna units; and the detection assembly comprises an absorbing layer, which is located between the antenna units and the coil assembly.

[0011] In one of the embodiments, the detection assembly comprises a graphite layer.

[0012] In one of the embodiments, the antenna assembly comprises the antenna units; and the detection assembly comprises an absorbing layer, which is located between the antenna units and the coil assembly.

[0013] In one of the embodiments, the coil assembly comprises a second mounting plate, a transmitting coil and a receiving coil, the second mounting plate is arranged in the main frame, and the transmitting coil and the receiving coil are arranged on opposite sides of the second mounting plate, respectively.

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

[0015] In one of the embodiments, the nonlinear detection module further comprises a radio frequency assembly, the radio frequency assembly comprises a shielding member and at least one group of nonlinear junction detection units, the shielding member is arranged in the main frame, the nonlinear junction detection units are arranged in the interior of the shielding member and are electrically connected with the antenna units in correspondence, and the coil assembly is located between the radio frequency assembly and the antenna assembly.

[0016] The second aspect of the embodiments of the present application provides a door plate comprising the above-mentioned detection assembly.

[0017] The third aspect of the embodiments of the present application provides a through-type detection device comprising the above-mentioned door plate.

[0018] In the detection assembly provided in this application embodiment, 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 with by the protective layer (e.g., graphite layer) contained in the coil assembly itself. That is, in this application embodiment, the coil assembly is located behind the signal transmission direction of the antenna assembly, and the coil assembly will not affect the antenna assembly. In addition, the eddy current detection module can achieve detection as long as it can detect a change in the original magnetic field, so placing 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 nonlinear detection module and the eddy current detection module can simultaneously detect the target object passing through the detection channel. By reasonably setting the arrangement, the reliability of the two detection technologies working together is improved. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a through-type detection device provided in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the left door panel in a through-type detection device provided in an embodiment of the present invention;

[0022] Figure 3 for Figure 2 An exploded view of the door panel shown in the image;

[0023] Figure 4 for Figure 3 The first-view exploded view of the detection component of the door panel shown;

[0024] Figure 5 for Figure 3 A second-view exploded view of the detection component shown;

[0025] Figure 6 This is a schematic diagram of the right door panel in a through-type detection device provided in an embodiment of the present invention;

[0026] Figure 7 for Figure 6 An exploded view of the door panel shown in the image;

[0027] Figure 8 for Figure 6 An exploded view of the detection assembly of the door panel shown in the image;

[0028] Figure 9 Structure diagram of a coil assembly in a vortex detection module provided by an embodiment of the utility model;

[0029] Figure 10 Structure diagram of an antenna assembly in a nonlinear node detection module provided by an embodiment of the utility model;

[0030] Figure 11 Explosive diagram of a radio frequency assembly in a nonlinear node detection module provided by an embodiment of the utility model;

[0031] Figure 12 Connection relationship diagram of a wave absorbing layer, a graphite layer and a second mounting plate provided by an embodiment of the utility model.

[0032] Reference signs:

[0033] 01, door plate; 02, central controller; 03, detection assembly; 04, detection channel;

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

[0035] 2, nonlinear 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, radio frequency assembly; 221, shielding member; 222, nonlinear node detection unit; 2211, first shielding plate; 2212, second shielding plate;

[0036] 3, vortex 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 DESCRIPTION

[0040] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0041] This utility model provides a detection component, a door panel, and a pass-through detection device. The detection component combines nonlinear node detection technology and eddy current detection technology, and has a reasonable arrangement, thereby improving the reliability of the two detection technologies working together.

[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 this application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on this application.

[0043] Please refer to Figure 4 , Figure 5 This utility model provides a detection component 03, applied to a through-type detection device. The through-type detection device includes... Figure 1 As shown, the through-type detection device may, for example, include door panels 01 located on both sides (to... Figure 1 Taking the shown viewpoint as an example, including the left door panel 01 and the right door panel 01, 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 inside each door panel 01. The detection component 03 is configured to... Figure 4 The posture corresponding to the shown viewpoint can be installed inside the left door panel 01 of the through-type detection device. The overall structural diagram of the left door panel 01 after installation is shown below. Figure 2 As shown. Detection component 03 with Figure 7 and Figure 8 The attitude corresponding to the viewing angle can be installed inside the right door panel 01 of the through-type detection device. The overall structural diagram of the right door panel 01 after installation is shown below. Figure 6 As shown. The detection component 03 may include a main frame 1 and a nonlinear detection module 2 and an eddy current detection module 3 disposed within the main frame 1.

[0044] It should be noted that, Figure 2 and Figure 6 In practical applications, the door panel 01 described herein can have panels on both the top and sides to create a closed structure. However, the top and side panels are not related to the improved design of this invention. Therefore, to clearly illustrate the connection between the main frame 1 and the other components, [the following is omitted as it is not part of the main design description]. Figure 2 and Figure 6 The door panel 01 shown conceals the top and side panels.

[0045] The nonlinear detection module 2 can include an antenna assembly 21, and the eddy current detection module 3 can include a coil assembly 31. The coil assembly 31 is located on the side of the antenna assembly 21 away from the detection channel 04. That is, in the embodiment of the present application, the coil assembly 31 is located on the back side of the antenna assembly 21 in the signal transmission 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 assembly 03 is located on the left side of the through-type detection device as shown in the perspective view, 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. Figure 1 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 nonlinear detection module 2 uses nonlinear junction detection technology to detect electronic devices. The nonlinear detection module 2 includes an antenna assembly 21, which can emit a fundamental wave to the detection channel 04 and receive a second harmonic and / or a third harmonic that may be generated by a target object passing through the detection channel 04. The nonlinear detection module 2 (e.g., a processor) analyzes the harmonics to determine whether the target object is an electronic device with a nonlinear junction, thereby achieving nonlinear detection. For specific analysis methods, please refer to existing technologies for nonlinear junction detection, such as comparing whether the amplitude of the harmonic is greater than a set threshold. If so, it is determined that there is a nonlinear junction.

[0047] The eddy current detection module 3 uses eddy current detection technology to detect electronic devices. The eddy current detection module 3 includes a coil assembly 31. When the transmitting coil of the coil assembly 31 is connected to an alternating current, it can generate an alternating magnetic field (original magnetic field). At this time, the receiving coil of the coil assembly 31 has no induced voltage. When the target object is a member with conductive properties (e.g., metal), the member will generate an induced current 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, i.e., 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, which can achieve detection of metal members or electronic devices with metal shells. For specific analysis methods of eddy current detection, please refer to existing technologies for security doors, such as frequency domain conversion of the induced signal, and extraction of amplitude and phase. If 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 be further noted that in traditional eddy current detection modules on the market, the coil assembly is usually provided with a protective layer (e.g., a graphite layer). The protective layer can effectively suppress external electromagnetic interference, while reducing the leakage of the coil assembly's own magnetic field, thereby avoiding affecting 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 emitted by the antenna assembly and the harmonic received, thereby affecting the reliability of nonlinear detection.

[0049] Therefore, in the detection assembly 03 provided by the embodiment of the utility model, the coil assembly 31 is located on the side of the antenna assembly 21 away from the detection channel 04, the fundamental wave emitted by the antenna assembly 21 can directly reach the detection channel 04, and the harmonic wave can also directly reach the antenna assembly 21, and will not be blocked or interfered by the protective layer (for example, the graphite layer) contained in the coil assembly 31. That is, in the embodiment of the application, the coil assembly 31 is not located on the signal emission path of the antenna assembly 21, and the protective layer of the coil assembly 31 will not affect the signals emitted and received by the antenna assembly 21. Moreover, as long as the eddy current detection module 3 can detect the change of the original magnetic field, the coil assembly 31 is arranged on the side of the antenna assembly 21 away from the detection channel 04, and will not affect the detection performance. In addition, as the working frequency band (the frequency band of the fundamental wave, the second harmonic wave and the third harmonic wave) of the antenna assembly 21 in the nonlinear detection module 2 is high, and the working frequency band (the frequency band of the driving signal of the transmitting coil and the frequency band of the induced voltage) of the coil assembly 31 is low, the working frequency bands of the two do not intersect, and therefore the two will not interfere with each other.

[0050] Therefore, when the detection assembly 03 is working, the nonlinear 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 emission. By reasonably arranging the arrangement mode, the reliability of the two detection technologies in cooperation with detection is improved.

[0051] Considering the specific arrangement of the antenna assembly 21, on the basis of the above embodiment, please refer to Figure 4 and Figure 10 The antenna assembly 21 can include 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 unit 212 is arranged on the first side surface 211a of the first mounting plate 211 facing the detection channel 04.

[0052] Specifically, each group of antenna units 212 is used for emitting the fundamental wave and receiving the second harmonic wave and the third harmonic wave. All the antenna units 212 can be arranged on the first side surface 211a of the first mounting plate 211 facing the detection channel 04, so as to realize 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 wave and the third harmonic wave, the fundamental wave and the second harmonic wave and the third harmonic wave will not be blocked by the first mounting plate 211, that is, the emission and reception operations of the antenna units 212 will not be affected by the first mounting plate 211.

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

[0054] Based on the above embodiment, considering the specific arrangement of the antenna unit 212, Figure 10 The number of antenna units 212 can be set as multiple groups, and each group of antenna units 212 is arranged at intervals along the height direction of the first mounting plate 211. For example, Figure 10 As shown in the figure, there are five 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 plate 01 along the height direction of the door plate 01 (i.e. the direction of gravity), that is, the first mounting plate 211 is arranged along the height direction of the detection channel 04. And each group 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 direction of gravity, so as to increase the detection area of the detection channel 04 along the direction of gravity, and to reduce the area of the detection blind area as much as possible and reduce the missed detection rate.

[0056] It is particularly pointed out that part of the fundamental wave emitted by the antenna unit 212 may be radiated backward (i.e. a back lobe is generated), and when the part of the fundamental wave is radiated to other components such as the radio frequency assembly 22 at the rear end, the non-linear junction inside will also generate harmonics under the influence of the fundamental wave, and this part of the harmonics may also be detected by the non-linear detection module 2, which may cause false judgment. Therefore, the phenomenon that part of the fundamental wave is radiated backward will affect the detection effect of the non-linear detection module 2. In addition, in the case that the first mounting plate 211 and the main frame 1 are both metal components, the first mounting plate 211 is in contact with one or more mounting points on the main frame 1. According to a large number of experiments, the utility model person has measured that the lap joint of the two metal components may also generate harmonics under the influence of the fundamental wave, thereby causing false alarm.

[0057] In order to avoid the backward radiation of the fundamental wave emitted by the antenna unit 212 from causing a high false alarm rate of the non-linear detection module 2. Based on the above embodiment, referring to Figure 12 In an embodiment of the present application, the antenna assembly 21 can further include an antenna unit 212. The detection assembly 03 includes a wave-absorbing layer 4, and the wave-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 greater than the fundamental frequency and electromagnetic waves with a frequency equal to the fundamental frequency. 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 avoid the backward lobe of the fundamental wave from being radiated to the components with nonlinear nodes or the metal joints inside the door panel 01 to generate harmonics, thereby avoiding affecting the nonlinear detection module 2 and reducing the false alarm rate.

[0059] In addition, for a through-type detection device, two door panels 01 are generally provided, and the detection assembly 03 described above can be arranged in one of the door panels 01, or the detection assembly 03 described above can be arranged in both door panels 01. For the application scenario where the detection assembly 03 is arranged in both door panels 01, when both door panels 01 work at the same time, the antenna units 212 in the left door panel 01 will also emit the fundamental wave toward the detection channel 04, and the main lobe of this part of the fundamental wave is directly radiated toward the right door panel 01. If the right door panel 01 does not have a wave-absorbing layer 4, the fundamental wave emitted by the left door panel 01 can also reach the right door panel 01, and generate harmonics at the components with nonlinear nodes or the metal joints inside the right door panel 01, thereby causing false alarms.

[0060] Therefore, for the wave-absorbing layer 4 in the door panel 01, it can not only absorb the backward lobe of the fundamental wave emitted by the antenna units 212 inside the door panel 01 itself, 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 nonlinear detection module 2 in each door panel 01.

[0061] Further, the wave-absorbing layer 4 can absorb high-frequency electromagnetic waves, not only the backward lobe of the fundamental wave, but also the second and third harmonics to some extent. Therefore, even if the backward lobe of the fundamental wave generates harmonics at the components with nonlinear nodes or the metal joints inside the door panel 01, the harmonics will be absorbed by the wave-absorbing layer 4 when radiated outward, and will not be radiated to the antenna units 212, thereby reducing the false alarm rate.

[0062] In one 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. In this way, 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 avoid the backward lobe of the fundamental wave from being radiated to the components with nonlinear nodes or the metal joints inside the door panel to generate harmonics, thereby avoiding affecting the nonlinear detection module 2 and reducing the false alarm rate.

[0063] In another specific embodiment, the wave-absorbing layer 4 can also be arranged opposite to a specific area on the first side 211b of the first mounting plate 211, the specific area containing one or more antenna units 212 and corresponding to a common location where a suspicious electronic device is likely to be hidden by a pedestrian. In other words, the wave-absorbing layer 4 can also be arranged only at a key location. In this way, on the one hand, the wave-absorbing layer 4 can absorb the backward radiation of the fundamental wave of each antenna unit 212 located in the set area (e.g., the key area) to avoid false positives of the nonlinear detection module 2, and on the other hand, the wave-absorbing layer 4 can also reduce the use of materials and lower the cost. In a specific embodiment, the wave-absorbing layer 4 is made of a wave-absorbing material that can absorb high-frequency electromagnetic waves.

[0064] For example, the wave-absorbing layer 4 can be a plated layer made of a soft magnetic material and plastic (e.g., polyurethane) after compounding. The soft magnetic material can include iron, silicon, aluminum, copper, etc.

[0065] It should be noted that the working frequency band of the nonlinear detection module 2 is relatively high, and the working frequency band of the coil assembly 31 in the eddy current detection module 3 is relatively low, and there is no intersection between the working frequency bands of the two, so the wave-absorbing layer 4 will not interfere with the working of the coil assembly 31. In addition, as long as the coil assembly 31 in the eddy current detection module 3 can detect the change of the original magnetic field to realize detection, the wave-absorbing layer 4 will not interfere with the detection of the coil assembly 31, so 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 assembly 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 make the eddy current detection module 3 not respond, thereby reducing the false positive rate of the eddy current detection module 3.

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

[0068] Specifically, the graphite layer 5 is covered on the second side 211b of the first mounting plate 211 and located behind the antenna unit 212 in the direction of the fundamental wave emission, and the wave-absorbing layer 4 is covered on the graphite layer 5 and 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 direction of the beam emission, 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 does not affect the fundamental wave emitted by the antenna unit 212. In addition, the graphite layer 5 is arranged in front of the wave-absorbing layer 4, and 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, thereby greatly improving the effect of the wave-absorbing layer 4 shielding electromagnetic waves and further reducing the false positive rate of the nonlinear detection module 2.

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

[0070] In some embodiments, as shown in Figure 4 , Figure 5 and Figure 11 , the nonlinear detection module 2 can also include a radio frequency assembly 22, which can include a shielding member 221 arranged in the main frame 1 and at least one set of nonlinear node detection units 222 arranged inside the shielding member 221 and electrically connected with the antenna unit 212. The nonlinear 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 nonlinear node detection unit 222 is arranged in the shielding member 221, which has an electromagnetic shielding effect. Since some components inside the radio frequency assembly 22 also have nonlinear 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 assembly 22, and reduce the false positive rate of the nonlinear detection module 2.

[0072] Further, for the application scenario that both side door plates 01 in the above-mentioned through-type detection device are provided with detection assemblies 03, the shielding member 221 in one side door plate 01 can also block the main lobe of the fundamental wave emitted by the antenna unit 212 in the other side door plate 01.

[0073] In addition, the shielding member 221 can also prevent external electromagnetic interference signals from affecting the internal circuit of the nonlinear node detection unit 222, and prevent electromagnetic radiation generated by the nonlinear node detection unit 222 from leaking to the external environment, thereby preventing interference with other electronic devices or systems around.

[0074] In a specific embodiment, referring to Figure 11 , the shielding member 221 can include a first shielding plate 2211 and a second shielding plate 2212, which are opposite and buckled to form a cover body with a cavity inside. The non-linear node detection unit 222 is arranged in the cavity to effectively prevent the influence of external electromagnetic waves on the internal circuit of the non-linear node detection unit 222.

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

[0076] It should be pointed out that the shielding member 221 itself has electromagnetic shielding function, and is usually made of 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 current under the action of the eddy current detection module 3, thereby causing false induction signal and false alarm, which will interfere with the detection effect of the coil assembly 31.

[0077] For this purpose, referring 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 arranged on the side of the coil assembly 31 away from the detection channel 04. That is, compared with the coil assembly 31 and the antenna assembly 21, the radio frequency assembly 22 is arranged 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.

[0078] In some embodiments of the present application, referring to Figure 10 and Figure 11, the nonlinear junction detection unit 222 is consistent with the number of antenna units 212, and is arranged one by one (that is, one nonlinear junction detection unit 222 is electrically connected with one antenna unit 212). In this way, the wiring between the nonlinear junction detection unit 222 and the corresponding antenna unit 212 is facilitated and signal connection is achieved, and the wiring layout can be ensured to be clear and neat. Among them, the nonlinear junction detection unit 222 is electrically connected with the first-order transmitting antenna 2121, the second-order receiving antenna 2122 and the third-order receiving antenna 2123 in the antenna unit 212. In this way, the nonlinear junction 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 to the detection channel 04 for detection of the target object. If the target object carries a nonlinear junction or is an electronic device with nonlinear junction characteristics, the second-order receiving antenna 2122 will receive a second-order harmonic corresponding to the fundamental wave, and the third-order receiving antenna 2123 will receive a third-order harmonic corresponding to the fundamental wave, and transmit to the nonlinear junction detection unit 222, and the nonlinear junction detection unit 222 analyzes the signal and outputs the result, or transmits the signal to the control module (for example, it can be the central controller 02 in Figure 1

[0079] Considering the specific arrangement 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 arranged on opposite sides of the second mounting plate 311, respectively.

[0080] Among them, the transmitting coil 312 will generate an alternating magnetic field after passing through an alternating current, and the receiving coil 313 is used to induce 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, the receiving coil 313 has no induced voltage; 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 there is a target object in the detection channel 04, thereby realizing 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 arranged on the third side 311a of the second mounting plate 311 facing the detection channel 04, and the transmitting coil 312 is arranged on the fourth side 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, and 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 negative rate.

[0082] In a specific embodiment, the transmitting coil 312 and the receiving coil 313 are both arranged in multiple numbers. 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 negative rate.

[0083] In view of the specific structure of the main frame 1, on the basis of the above-mentioned embodiments, please refer to Figure 3 and Figure 4 , the main frame 1 is a rectangular frame, the rectangular frame is provided with a hollow structure penetrating in the thickness direction, and 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 to the detection channel 04, so as 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 shown in Figure 8 , the inside of the hollow structure can be provided with multiple mounting members 11 arranged at intervals in the height direction of the main frame 1, and the mounting member 11 is used to connect the shielding member 221, the second mounting plate 311 and the first mounting plate 211.

[0085] Alternatively, the mounting member 11 can include a clamping strip structure provided with buckles 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 structure, and the shielding member 221, the second mounting plate 311 and the first mounting plate 211 are connected to the mounting member by means of adhesives, bolts or welding.

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

[0088] Alternatively, the first cover plate 6 and the second cover plate 7 are both made of wood, and the wood has a lighter material, which can meet the lightweight demand of the product.

[0089] Please refer to Figure 2 The utility model embodiment provides a door plate 01, including the detection assembly 03 disclosed in above embodiment, the detection assembly 03 is arranged in the door plate 01 along the height direction of the door plate 01, that is, the detection assembly 03 and the door plate 01 are both vertically placed. The door plate 01 can be the door plate 01 of any side of the through type detection device.

[0090] Please refer to Figure 1 The utility model embodiment provides a through type detection device, including the door plate 01.

[0091] In a specific embodiment, a pair of door plates 01 (such as the left door plate 01 and the right door plate 01) are oppositely and spacedly arranged, and the through type detection device can further include a central controller 02, which is arranged between the top ends of the pair of door plates 01 and is electrically connected with the nonlinear detection module 2 and the eddy current detection module 3 respectively, so as to receive the signals fed back by the nonlinear detection module 2 and the eddy current detection module 3 and output the detection results after signal analysis or directly output the detection results. Wherein, the two door plates 01 and the central controller 02 jointly enclose the above-mentioned detection channel 04.

[0092] The through type detection device provided in the embodiment of the application can be placed in places requiring security check, such as schools, subway stations, airports, ticket checking gates of stations, etc. When the through type detection device provided in the above embodiment is working, the detection channel 04 is formed between the two door plates 01, when the pedestrians pass through the detection channel 04, the antenna assembly 21 in the nonlinear detection module 2 located in the door plate 01 emits the fundamental wave to the detection channel 04 and receives the second or third harmonic waves possibly generated by the articles carried by the pedestrians, then analyzes these signals and transmits the processing results to the central controller 02, or directly sends the received signals to the central controller 02 for signal analysis, and finally outputs the detection results to confirm whether the articles are electronic devices with nonlinear junctions, so as to realize nonlinear detection. At the same time, the coil assembly 31 in the eddy current detection module 3 located in the door plate 01 generates an alternating magnetic field, when the articles carried by the pedestrians are target objects with conductive properties, the electronic devices will generate induced current under the action of the original magnetic field, the magnetic field generated by the induced current interacts with the original magnetic field, the receiving coil 313 outputs the induced voltage to the central controller 02, and the central controller 02 outputs the detection results of the target objects carried by the pedestrians, so as to realize eddy current detection. Moreover, the coil assembly 31 is located on the side of the antenna assembly 21 away from the detection channel 04, and when the antenna assembly 21 emits the fundamental wave, the fundamental wave can directly reach the detection channel 04 without being blocked or interfered by the protective layer (such as graphite layer) contained in the coil assembly 31 itself.

[0093] Therefore, the through type detection device combines the nonlinear joint detection technology and the eddy current detection technology, and reasonably sets the arrangement mode, so that the reliability of the two detection technologies in cooperation detection can be improved.

[0094] It should be noted that in the present specification, the relational terms such as first and second are used only to differentiate one entity from another, without necessarily requiring or implying any such actual relationship or order between such entities.

[0095] The various embodiments are described in the present specification in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between various embodiments can be mutually referred to.

[0096] The above provides a detailed introduction to the detection assembly, the door plate and the through type detection device. The principle and implementation mode of the present application are described by applying specific examples. The above embodiment is only used to help understand the method and core idea of the present application. It should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principle of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A detection component (03) applied to a pass-through detection device, the pass-through detection device comprising door panels (01) located on both sides, wherein a detection channel (04) is formed between the door panels (01) on both sides, characterized in that, The detection component (03) can be installed in each side panel (01) of the through-type detection device; the detection component includes a main frame (1) and a nonlinear detection module (2) and an eddy current detection module (3) disposed in the main frame (1); The nonlinear detection module (2) includes an antenna assembly (21), and the eddy current detection module (3) includes 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).

2. The detection component (03) according to claim 1, characterized in that, The antenna assembly (21) includes a first mounting plate (211) and at least one set of antenna elements (212). The first mounting plate (211) is disposed in the main frame (1), and the antenna elements (212) are disposed on the first side (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 unit (212) is configured as multiple groups, and each group of antenna units (212) is 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 assembly (21) includes an antenna element (212), and the detection assembly (03) includes an absorbing layer (4) located between the antenna element (212) and the coil assembly (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 assembly (21) includes an antenna element (212); the detection assembly (03) includes an absorbing layer (4), and the absorbing layer (4), the graphite layer (5) and the antenna element (212) are arranged in order from far to near the detection channel (04).

7. The detection component (03) according to claim 1, characterized in that, 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 disposed in the main frame (1), and the transmitting coil (312) and the receiving coil (313) are respectively disposed 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 disposed on the third side (311a) of the second mounting plate (311) facing the detection channel (04), and the transmitting coil (312) is disposed on the fourth side (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 nonlinear detection module (2) further includes a radio frequency component (22), which includes a shielding member (221) and at least one set of nonlinear node detection units (222). The shielding member (221) is located in the main frame (1), and the nonlinear node detection units (222) are located inside the shielding member (221) and are electrically connected to the antenna unit (212). The coil assembly (31) is located between the radio frequency assembly (22) and the antenna assembly (21).

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

11. A through-type detection device, characterized in that, Includes the door panel (01) as described in claim 10.

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