Coil structure and through-type detector

Abstract

The utility model discloses a coil structure and a through-type detector, and relates to the technical field of detector design. The first transmitting coil and the second transmitting coil in each transmitting coil group are arranged in a non-overlapping or partially overlapping manner, and the current directions of the two oppositely arranged first transmitting coils are the same, namely, the two oppositely arranged first transmitting coils form a superimposed field to form a magnetic field in the X-axis direction; the directions of currents of the two oppositely arranged second transmitting coils are opposite, that is, the two oppositely arranged second transmitting coils form a repulsion field, and at the moment, magnetic fields in the Y-axis direction and the Z-axis direction can be generated, that is, magnetic fields exist in the X-axis direction, the Y-axis direction and the Z-axis direction. Therefore, when the transmitting coil groups which are oppositely arranged work at the same time, a superimposed field and a repulsion field exist at the same time, and the condition of working mode switching does not exist, so that the problem that the detected amplitude data have spikes due to mode switching is avoided, and the detection accuracy is improved.

Description

Technical Field

[0001] The present application relates to the technical field of detector design, and in particular to a coil structure and a pass-through detector. Background Art

[0002] In public places such as airports and stations, detectors are usually used to detect objects. For example, a pass-through detector is set up to detect objects.

[0003] Traditional pass-through detectors have coils installed in the door panels on both sides. The magnetic lines of force inside the detector are basically distributed in the horizontal direction, that is, the X direction, from one door panel to the other, and there are a lot of blind spots in the Y-axis direction and the Z-axis direction. If the person being tested carries a metal panel or a mobile phone, and keeps the maximum cross-section of the metal panel or mobile phone parallel to the horizontal magnetic lines of force when passing through the pass-through detector, at this time, the cross-section of the metal panel or mobile phone passing through the horizontal magnetic lines of force is very small, and fewer magnetic lines of force pass through, so the eddy current effect generated is small, and the detected eddy current signal is weak, which may cause the detector to miss the judgment phenomenon, and the reliability of the detection result is greatly reduced.

[0004] It can be seen that how to improve the reliability of the detector's detection results is a technical problem that people in this field urgently need to solve. Utility Model Content

[0005] The purpose of the present application is to provide a coil structure and a through-type detector to solve the technical problem of low reliability of the detection result of the detector.

[0006] In order to solve the above technical problems, an embodiment of the present application provides a coil structure, including: two groups of transmitting coil groups;

[0007] Each of the transmitting coil groups includes a first transmitting coil and a second transmitting coil, and the first transmitting coil and the second transmitting coil are placed without overlap or partially overlap; the first transmitting coils in the two transmitting coil groups are arranged opposite to each other, and the second transmitting coils in the two transmitting coil groups are arranged opposite to each other;

[0008] The directions of the currents of the two first transmitting coils arranged opposite to each other are the same;

[0009] The currents of the two second transmitting coils arranged opposite to each other are in opposite directions. Further, the first transmitting coil and the second transmitting coil are placed without overlapping.

[0010] Furthermore, the first transmitting coil includes a plurality of first sub-coils, the projections of the plurality of first sub-coils on the plane formed by the Y-axis and the Z-axis are arranged in a circle, and the current directions of the first sub-coils are the same;

[0011] The second transmitting coil includes a plurality of second sub-coils, and projections of the plurality of second sub-coils on a plane formed by the Y axis and the Z axis are arranged in a circle, and current directions of the second sub-coils in one second transmitting coil are the same.

[0012] Further, the first transmitting coil and the second transmitting coil in the same transmitting coil group are arranged along the Y-axis direction.

[0013] Further, the first transmitting coil is formed by winding a first conductive wire, and the second transmitting coil is formed by winding a second conductive wire. In the same group of transmitting coils, the first conductive wire and the second conductive wire are connected to the same power interface.

[0014] Furthermore, the first transmitting coil and the second transmitting coil in each group of the transmitting coil groups are formed by winding a wire.

[0015] Further, each of the transmitting coil groups further includes a third transmitting coil, and the third transmitting coil is placed without overlapping or partially overlapping with the first transmitting coil, and the third transmitting coil is placed without overlapping or partially overlapping with the second transmitting coil, and the third transmitting coils in the two transmitting coil groups are arranged opposite to each other; the current directions of the two opposite third transmitting coils are opposite;

[0016] In the same group of transmitting coils, the position of the blind area of ​​the magnetic flux lines in the Z-axis direction of the second transmitting coil is different from the position of the blind area of ​​the magnetic flux lines in the Z-axis direction of the third transmitting coil; or, one of the second transmitting coil and the third transmitting coil has a blind area of ​​the magnetic flux lines in the Z-axis direction, and the other does not have a blind area of ​​the magnetic flux lines in the Z-axis direction.

[0017] Further, the first transmitting coil, the second transmitting coil, and the third transmitting coil in the same group of transmitting coils are arranged along the Y-axis direction.

[0018] Further, the second transmitting coil and the third transmitting coil both include a first conducting wire along the Y-axis direction; and a region between two adjacent first conducting wires with opposite current directions in the second transmitting coil and a region between two adjacent first conducting wires with opposite current directions in the third transmitting coil are located at different positions on the Z-axis.

[0019] Further, the projections of the second sub-coils in the second transmitting coil on the plane formed by the Y-axis and the Z-axis are arranged in a circle, and the third transmitting coil includes a plurality of sub-coil groups, and adjacent sub-coil groups are arranged at intervals or overlapped, and the directions of the currents of adjacent sub-coil groups are opposite.

[0020] Furthermore, the sub-coil group includes a plurality of third sub-coils whose projections on the plane formed by the Y axis and the Z axis intersect with each other, and the current directions of the third sub-coils in the same sub-coil group are the same.

[0021] Furthermore, each of the third sub-coils includes a first conducting line along the Y-axis direction, and an area between two adjacent first conducting lines with the same current flow direction in adjacent third sub-coils is within the range of the Z-axis, covering an area between two adjacent first conducting lines with opposite current directions in the second transmitting coil within the range of the Z-axis.

[0022] Further, the first transmitting coil is formed by winding a first wire, the second transmitting coil is formed by winding a second wire, and the third transmitting coil is formed by winding a third wire, and in the same group of the transmitting coil groups, the first wire, the second wire and the third wire are connected to the same power interface.

[0023] In order to solve the above technical problems, the embodiment of the present application further provides a pass-through detector, including:

[0024] A door panel structure, the door panel structure comprising a first door panel and a second door panel;

[0025] As in the coil structure described above, one group of the transmitting coil groups is arranged in the first door panel, and another group of the transmitting coil groups is arranged in the second door panel.

[0026] A coil structure provided in an embodiment of the present application includes two groups of transmitting coil groups. Each group of transmitting coil groups includes a first transmitting coil and a second transmitting coil, and the first transmitting coil and the second transmitting coil are placed without overlap or partially overlap. The first transmitting coils in the two groups of transmitting coil groups are arranged opposite to each other, and the second transmitting coils in the two groups of transmitting coil groups are arranged opposite to each other. The directions of the currents of the two first transmitting coils arranged opposite to each other are the same. The directions of the currents of the two second transmitting coils arranged opposite to each other are opposite.

[0027] Based on the coil arrangement mode in which the first transmitting coil and the second transmitting coil in each transmitting coil group are placed without overlap or partially overlap, the directions of the currents of the two first transmitting coils arranged opposite to each other are the same, that is, the two first transmitting coils arranged opposite to each other form a superposition field, which can generate a magnetic field in the X-axis direction. The directions of the currents of the two second transmitting coils arranged opposite to each other are opposite, that is, the two second transmitting coils arranged opposite to each other form a repulsive field, and at this time, magnetic fields in the Y-axis and Z-axis directions can be generated, that is, there are magnetic fields in the X-axis, Y-axis and Z-axis directions. When the transmitting coil groups arranged opposite to each other work at the same time, there are superposition fields and repulsive fields at the same time, and there is no working mode switching, thereby avoiding the problem of spikes in the detected amplitude data due to mode switching, thereby improving the accuracy of detection.

[0028] In addition, an embodiment of the present application also provides a through-type detector having the same or corresponding technical features as the coil structure mentioned above, and having the same effects as above. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A schematic diagram of a pass-through detector provided in the first embodiment of the present application;

[0031] Figure 2 A schematic diagram of the working state of the transmitting coil group provided in the first embodiment;

[0032] Figure 3 for Figure 1 A schematic structural diagram of a first transmitting coil in the coil structure shown;

[0033] Figure 4 for Figure 1 A schematic structural diagram of a second transmitting coil in the coil structure shown;

[0034] Figure 5 for Figure 2 A schematic diagram of magnetic flux lines in the X-axis direction when the first transmitting coils arranged opposite to each other in the coil structure shown are working;

[0035] Figure 6 for Figure 2 A schematic diagram of magnetic flux lines in the Y-axis direction when the second transmitting coil arranged opposite to each other in the coil structure shown is working;

[0036] Figure 7 for Figure 2 A schematic diagram of magnetic flux lines in the Z-axis direction when the second transmitting coil arranged opposite to each other in the coil structure shown is working;

[0037] Figure 8 A schematic diagram of the structure of a transmitting coil group provided in the second embodiment of the present application;

[0038] Fig. 9 for Figure 8 A schematic structural diagram of the third transmitting coil in the transmitting coil group shown;

[0039] Fig.10 A schematic diagram of the coil structure provided for the second embodiment in a working state;

[0040] Fig.11 for Fig.10 Schematic diagram of magnetic flux lines in the Z-axis direction when the third transmitting coil arranged opposite to each other in the coil structure is working.

[0041] The reference numerals are as follows: 10 - first door panel; 20 - second door panel; 30 - top panel; 1 - first transmitting coil; 2 - second transmitting coil; 3 - third transmitting coil; 11, 12, 13, 14 - first sub-coil; 21, 22, 23, 24 - second sub-coil; 31 - sub-coil group; 311, 312 - third sub-coil. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] First embodiment:

[0044] This embodiment provides a coil structure to solve the technical problem of low reliability of the detection result of the detector.

[0045] It should be noted that the coil structure provided in the present application is used in a device for detecting a target object, wherein the target object is, for example, metal. The coil structure can be applied to a pass-through detector (such as a security gate) and is suitable for a variety of places, such as airports, stations, etc.

[0046] In order to make the technical personnel in this field better understand the present application, the present application is further described in detail below in combination with the accompanying drawings and specific implementation methods. The present application embodiment provides a coil structure, including: two groups of transmitting coil groups.

[0047] Each transmitting coil group includes a first transmitting coil 1 and a second transmitting coil 2, and the first transmitting coil 1 and the second transmitting coil 2 are placed without overlapping or partially overlapping.

[0048] The first transmitting coils 1 in the two transmitting coil groups are arranged opposite to each other, and the second transmitting coils 2 in the two transmitting coil groups are arranged opposite to each other.

[0049] The directions of the currents of the two first transmitting coils 1 arranged opposite to each other are the same.

[0050] The directions of the currents of the two second transmitting coils 2 arranged opposite to each other are opposite.

[0051] To facilitate the description of the coil structure, first Figure 1 Taking as an example, the directions of the X-axis, the Y-axis, and the Z-axis are described. Figure 1A schematic diagram of a pass-through detector provided in the first embodiment of the present application is shown in FIG. Figure 1 As shown, the pass-through detector includes a first door panel 10, a second door panel 20 and a top panel 30. A set of transmitting coil groups are respectively arranged on the first door panel 10 and the second door panel 20, and each set of transmitting coils includes a first transmitting coil 1 and a second transmitting coil 2. The Y axis is parallel to the bottom edge m of the door panel (i.e., the direction in which pedestrians walk through the pass-through detector), the X axis is perpendicular to the bottom edge m of the door panel, and the Z axis is parallel to the side edge n of the door panel. Figure 1 The X-axis direction, the Y-axis direction and the Z-axis direction are only provided as a reference. In practice, the X-axis direction, the Y-axis direction and the Z-axis direction may be changed accordingly according to the actual situation.

[0052] There is no limitation on the structure of the first transmitting coil 1 and the structure of the second transmitting coil 2. There is no limitation on the position of the first transmitting coil 1 and the second transmitting coil 2, as long as the first transmitting coil 1 and the second transmitting coil 2 in each transmitting coil group (such as on each side door panel) are placed without overlap or partially overlap, and the two first transmitting coils 1 (such as the two first transmitting coils 1 on the two side door panels) are arranged oppositely, and the two second transmitting coils 2 (such as the two second transmitting coils 2 on the two side door panels) are arranged oppositely. Specifically, in each transmitting coil group, the first transmitting coil 1 and the second transmitting coil 2 are placed without overlap or partially overlap along the Y axis, or without overlap or overlap along the Z axis (the overlapping arrangement here refers to complete overlap or partial overlap). Figure 1 and Figure 2 , the first transmitting coil 1 and the second transmitting coil 2 are placed without overlap along the Y axis. In order to increase the magnetic field range on the Y axis and improve the detection range, in the embodiment, each group of the first transmitting coil 1 and the second transmitting coil 2 are placed without overlap. Figure 1 The first transmitting coil 1 on the first door panel 10 and the second transmitting coil 2 on the first door panel 10 are arranged front and back along the Y-axis direction, and there is a distance between them, that is, there is no overlap between the first transmitting coil 1 on the first door panel 10 and the second transmitting coil 2 on the first door panel 10. Figure 1 The first transmitting coil 1 on the second door panel 20 and the second transmitting coil 2 on the second door panel 20 are arranged front and back along the Y-axis direction, and there is a distance between the two, that is, there is no overlap between the first transmitting coil 1 on the second door panel 20 and the second transmitting coil 2 on the second door panel 20. In other embodiments, in the same transmitting coil group, the first transmitting coil 1 and the second transmitting coil 2 can also be distributed up and down along the Z-axis, and there is no overlap or partial overlap between the two.

[0053] The first transmitting coil 1 on the first door panel 10 and the first transmitting coil 1 on the second door panel 20 are arranged opposite to each other, and the second transmitting coil 2 on the first door panel 10 and the second transmitting coil 2 on the second door panel 20 are arranged opposite to each other. It should be noted that the relative arrangement here includes a completely relative arrangement (such as the projection of the first transmitting coil 1 on the first door panel 10 on the second door panel 20 completely overlaps with the first transmitting coil 1 on the second door panel 20; the projection of the second transmitting coil 2 on the first door panel 10 on the second door panel 20 completely overlaps with the second transmitting coil 2 on the second door panel 20), and also includes a partial relative arrangement (such as the projection of the first transmitting coil 1 on the first door panel 10 on the second door panel 20 overlaps with a partial area of ​​the first transmitting coil 1 on the second door panel 20; the projection of the second transmitting coil 2 on the first door panel 10 on the second door panel 20 overlaps with a partial area of ​​the second transmitting coil 2 on the second door panel 20). Figure 1 , Figure 2 The first transmitting coil 1 on the first door panel 10 and the first transmitting coil 1 on the second door panel 20 are completely opposite to each other, and Figure 1 , Figure 2 The second transmitting coil 2 on the first door panel 10 and the second transmitting coil 2 on the second door panel 20 are arranged completely opposite to each other.

[0054] In order to avoid the problem of spikes in the detected amplitude data due to mode switching and improve the accuracy of detection, in the coil structure provided in the embodiment of the present application, one of the two first transmitting coils 1 and the two second transmitting coils 2 relatively arranged form a superposition field and the other forms a repulsive field. There is no limitation on the current direction of the two first transmitting coils 1 relatively arranged and the current direction of the two second transmitting coils 2 relatively arranged, as long as the directions of the currents of the two first transmitting coils 1 relatively arranged are the same and the directions of the currents of the two second transmitting coils 2 relatively arranged are opposite, or the directions of the currents of the two first transmitting coils 1 relatively arranged are opposite and the directions of the currents of the two second transmitting coils 2 relatively arranged are the same. In the embodiment of the present application, the coil structure of the present application is described with the currents of the two first transmitting coils 1 relatively arranged having the same direction and the currents of the two second transmitting coils 2 relatively arranged having opposite directions.

[0055] Figure 2 A schematic diagram of the working state of the transmitting coil group provided in the first embodiment, as shown in FIG. Figure 2As shown, the current direction of the first transmitting coil 1 on the first door panel 10 is the same as the current direction of the first transmitting coil 1 on the second door panel 20, both in the counterclockwise direction. The current direction of the second transmitting coil 2 on the first door panel 10 is clockwise, while the current direction of the second transmitting coil 2 on the second door panel 20 is counterclockwise, that is, the current directions of the second transmitting coil 2 on the first door panel 10 and the second transmitting coil 2 on the second door panel 20 are opposite.

[0056] In the coil structure provided in this embodiment, based on the coil arrangement of the first transmitting coil 1 and the second transmitting coil 2 in each transmitting coil group mentioned above, the directions of the currents of the two first transmitting coils 1 arranged opposite to each other are the same, thereby forming a superposition field and generating a magnetic field in the X-axis direction. The directions of the currents of the two second transmitting coils 2 arranged opposite to each other are opposite, that is, a repulsive field is formed. At this time, magnetic fields in the Y-axis and Z-axis directions can be generated. Therefore, this embodiment does not need to switch modes, and magnetic fields in the X-axis, Y-axis and Z-axis directions can be generated simultaneously. If each transmitting coil group uses only one transmitting coil (such as the first transmitting coil 1), when it is necessary to generate a magnetic field in the X-axis direction, it is necessary to make the current directions of the two first transmitting coils 1 the same (called mode 1). If it is necessary to generate magnetic fields in the Y-axis and Z-axis directions, it is necessary to switch the current directions of the two first transmitting coils 1 to the opposite direction (called mode 2). Therefore, for this solution, if there is a magnetic field in the X-axis, Y-axis and Z-axis directions, it is necessary to switch back and forth between two working modes (mode 1 and mode 2). In order to overcome the above problems, the embodiment of the present application can simultaneously have superposition fields and repulsion fields when two sets of transmitting coil groups arranged relatively to each other work at the same time, that is, there are magnetic fields in the directions of the X-axis, the Y-axis and the Z-axis, that is, there is no working mode switching, thereby avoiding the problem of spikes in the detected amplitude data due to mode switching, thereby improving the accuracy of detection.

[0057] In order to enable those skilled in the art to better understand the coil structure in the embodiment of the present application, the scheme in the embodiment of the present application is described below with a specific coil structure. Figure 3 for Figure 1 The schematic diagram of the structure of the first transmitting coil in the coil structure shown in FIG. Figure 1 The first transmitting coil 1 on the first door panel 10 and the first transmitting coil 1 on the second door panel 20, the first transmitting coil 1 includes a plurality of first sub-coils, the projections of the plurality of first sub-coils on the plane formed by the Y-axis and the Z-axis are arranged circle by circle, and the current directions of the first sub-coils are the same. Figure 3It is shown in the figure that the first transmitting coil 1 includes four first sub-coils, which are first sub-coils 11, 12, 13, and 14 arranged in sequence. The first sub-coils 11, 12, 13, and 14 may be in the same plane or not, as long as the projection is arranged in sequence. There is no limitation on the direction of the current in the first sub-coil, as long as the direction of the current in all the first sub-coils in each first transmitting coil 1 is the same, and the direction of the current in all the first sub-coils in the two first transmitting coils 1 arranged opposite to each other is the same. The above Figure 2 It is shown that two first transmitting coils 1 arranged opposite to each other form a superposition field, and the current direction of each first sub-coil in the two first transmitting coils 1 arranged opposite to each other is counterclockwise.

[0058] Figure 4 for Figure 1 The schematic diagram of the structure of the second transmitting coil in the coil structure shown in FIG. Figure 1 The second transmitting coil 2 on the first door panel 10 and the second transmitting coil 2 on the second door panel 20, the second transmitting coil 2 includes a plurality of second sub-coils, and the projections of the plurality of second sub-coils on the plane formed by the Y-axis and the Z-axis are arranged circle by circle. In each second transmitting coil 2, the current directions of the second sub-coils are the same. Figure 4 It is shown in the figure that the second transmitting coil 2 includes four second sub-coils, which are second sub-coils 21, 22, 23, and 24 arranged in sequence. The second sub-coils 21, 22, 23, and 24 may be in the same plane or not, as long as the projection is arranged in sequence. There is no limitation on the direction of the current in the second sub-coil, as long as the current direction of all the second sub-coils in each second transmitting coil 2 is the same, and the current directions of the two second transmitting coils 2 arranged oppositely are opposite. Figure 2 It is shown that two second transmitting coils 2 arranged opposite to each other form a repulsive field, and the current directions of the second sub-coils in the second transmitting coil 2 on the first door panel 10 are the same, both are clockwise, and the current directions of the second sub-coils in the second transmitting coil 2 on the second door panel 20 are the same, both are counterclockwise.

[0059] In order to avoid the problem of spikes in the detected amplitude data due to mode switching, the relatively arranged transmitting coil groups in this embodiment can work simultaneously, so that the superposition field and the repulsive field can exist at the same time. In addition, the first transmitting coil 1 and the second transmitting coil 2 in the same group of transmitting coil groups are further arranged along the Y-axis direction to ensure that after the pedestrian passes through the detection channel, they will pass through the first transmitting coil 1 and the second transmitting coil 2 in sequence, so as to ensure that the magnetic fields on the X-axis, Y-axis and Z-axis can be used for all-round and accurate detection to avoid missed reports. It should be noted that there is no limitation on the order in which the first transmitting coil 1 and the second transmitting coil 2 in the same group of transmitting coil groups are arranged in the Y-axis direction. For example, the first transmitting coil 1 and the second transmitting coil 2 in the same group of transmitting coil groups are arranged in sequence along the positive direction of the Y-axis, or the second transmitting coil 2 and the first transmitting coil 1 in the same group of transmitting coil groups are arranged in sequence along the positive direction of the Y-axis. Figure 1 and Figure 2 What is shown in FIG. 1 is that the first transmitting coil 1 and the second transmitting coil 2 in the same transmitting coil group are arranged in sequence along the positive direction of the Y axis.

[0060] For the coil structure described in the first embodiment, in the implementation, in order to effectively reduce the resistance of the entire coil structure and reduce power consumption; at the same time, it does not require an excessive driving voltage to detect normally, so as to improve the electromagnetic conversion efficiency, the first transmitting coil 1 is formed by winding a first wire, and the second transmitting coil 2 is formed by winding a second wire, and in the same group of transmitting coil groups, the first wire and the second wire are connected to the same power interface. That is, in the same group of transmitting coil groups, the first transmitting coil 1 and the second transmitting coil 2 are arranged in parallel, so that the resistance of the entire coil structure can be effectively reduced and the power consumption can be reduced. At the same time, it does not require an excessive driving voltage to detect normally, which improves the electromagnetic conversion efficiency. In addition, in order to simplify the coil structure, in other embodiments, the first transmitting coil 1 and the second transmitting coil 2 in each group of transmitting coil groups are formed by winding a wire.

[0061] For the coil structure provided in the first embodiment, its working mode is to control the first transmitting coil 1 and the second transmitting coil 2 in the relatively arranged transmitting coil group to be energized, and the current directions of the relatively arranged first transmitting coils 1 are the same, and the current directions of the relatively arranged second transmitting coils 2 are opposite. The relatively arranged first transmitting coils 1 form a superposition field, and the current directions are all counterclockwise or clockwise, mainly generating X-component magnetic field lines uniformly distributed in the detection channel. Figure 5 for Figure 2 A schematic diagram of magnetic flux lines in the X-axis direction when the first transmitting coil arranged relatively in the coil structure shown in FIG. Figure 5 As shown, the first transmitting coil 1 arranged opposite to each other generates magnetic flux lines in the X-axis direction. The current direction of the second transmitting coil 2 arranged opposite to each other is opposite, thereby forming a repulsive field. Figure 2 The current direction of the second transmitting coil 2 on the first door panel 10 is clockwise, and the current direction of the second transmitting coil 2 on the second door panel 20 is counterclockwise. The second transmitting coils 2 on the door panels on both sides form a repulsive field, thereby generating Figure 6 The magnetic flux lines in the Y-axis direction and Figure 7 Magnetic flux lines in the Z-axis direction are shown.

[0062] In the first embodiment, the first transmitting coil 1 and the second transmitting coil 2 work simultaneously, so that the magnetic flux lines of the X, Y and Z axes can be generated simultaneously, and they only need to work in one working mode, and there is no working mode switching, thereby avoiding the problem of spikes in the detected amplitude data due to mode switching.

[0063] Second embodiment:

[0064] In the first embodiment, the second transmitting coil 2 may have a blind area of ​​magnetic flux lines in the Z-axis direction (refer to Figure 2 Taking the first door panel 10 as an example, the current directions of the two adjacent current lines a and b along the Y-axis direction of the second transmitting coil 2 are opposite. Similarly, in the second transmitting coil 2 on the second door panel 20, there are two adjacent current lines along the Y-axis direction with opposite current directions, resulting in a magnetic field blind zone along the Z-axis direction of the magnetic flux lines in the area between the current lines a and b, as shown in FIG. Figure 7 As shown in the figure, a blind area of ​​magnetic flux lines in the Z-axis direction is formed in the middle of the door panels on both sides). Among them, the blind area of ​​magnetic flux lines in the Z-axis direction refers to the area where there is no magnetic flux lines in the Z-axis direction or the intensity of the magnetic flux lines in the Z-axis direction is low and cannot be detected. The blind areas that appear below all refer to the blind areas of magnetic flux lines in the Z-axis direction.

[0065] If the second transmitting coil 2 has a blind spot in the Z-axis direction, the existence of the blind spot will affect the reliability of the detection result. In order to compensate for the blind spot generated by the second transmitting coil 2 in the first embodiment, the second embodiment of the present application further adds a third transmitting coil 3 on the basis of the first embodiment, such as Figures 8 to 10 It should be noted that the arrangement of the first transmitting coil 1 and the second transmitting coil 2 in the second embodiment is the same as that of the first transmitting coil 1 and the second transmitting coil 2 in the first embodiment, and will not be described in detail herein.

[0066] like Figures 8 to 10As shown, each transmitting coil group further includes a third transmitting coil 3, and the third transmitting coil 3 is placed without overlapping or partially overlapping with the first transmitting coil 1, and the third transmitting coil 3 is placed without overlapping or partially overlapping with the second transmitting coil 2. Specifically, the first transmitting coil 1 and the third transmitting coil 3 can be placed without overlapping or partially overlapping along the Y axis, or without overlapping or overlapping along the Z axis (the overlapping arrangement here refers to complete overlap or partial overlap). The second transmitting coil 2 and the third transmitting coil 3 can be placed without overlapping or partially overlapping along the Y axis, or without overlapping or overlapping along the Z axis (the overlapping arrangement here refers to complete overlap or partial overlap). Figure 8 and Fig.10 , the first transmitting coil 1 and the third transmitting coil 3 are placed without overlap along the Y axis, and the second transmitting coil 2 and the third transmitting coil 3 are placed without overlap along the Y axis. In order to increase the magnetic field range and thus improve the detection range, in implementation, the first transmitting coil 1, the second transmitting coil 2 and the third transmitting coil 3 can be placed without overlap. Figure 8 and Fig.10 There is a distance between the third transmitting coil 3 and the second transmitting coil 2 of each transmitting coil group.

[0067] The current directions of the two opposite third transmitting coils 3 are opposite. It should be noted that the third transmitting coil 3 located on the first door panel 10 and the third transmitting coil 3 located on the second door panel 20 can be completely oppositely arranged (the projection of the third transmitting coil 3 on the first door panel 10 on the second door panel 20 completely overlaps with the third transmitting coil 3 on the second door panel 20), or can be partially oppositely arranged (the projection of the third transmitting coil 3 on the first door panel 10 on the second door panel 20 overlaps with a partial area of ​​the third transmitting coil 3 on the second door panel 20). Fig.10 The third transmitting coil 3 on the first door panel 10 and the third transmitting coil 3 on the second door panel 20 are arranged completely opposite to each other.

[0068] Furthermore, in order to compensate for the blind spot generated by the second transmitting coil 2 in the Z-axis direction, in the same group of transmitting coils, the position of the blind spot of the magnetic flux lines of the second transmitting coil 2 in the Z-axis direction is different from the position of the blind spot of the magnetic flux lines of the third transmitting coil 3 in the Z-axis direction. Specifically, the range of the blind spot of the magnetic flux lines of the second transmitting coil 2 in the Z-axis direction (such as the height range) and the range of the blind spot of the magnetic flux lines of the third transmitting coil 3 in the Z-axis direction (such as the height range) may be partially the same or completely different. In order to reduce the probability of missed reports, in this embodiment, if the third transmitting coil 3 has a blind spot in the Z-axis, the blind spot of the third transmitting coil 3 in the Z-axis needs to be different from the position of the blind spot of the second transmitting coil 2 in the Z-axis, so that the second transmitting coil 2 and the third transmitting coil 3 can compensate for each other's blind spots. For example, the second transmitting coil 2 is assumed to have a blind spot in area a, while the third transmitting coil 3 has no blind spot in area a. Thus, under the joint action of the second transmitting coil 2 and the third transmitting coil 3, the effect of no blind spot can be achieved for area a, that is, if the target object passes through area a, it will be detected.

[0069] In other embodiments, one of the second transmitting coil 2 and the third transmitting coil 3 may have a blind spot of the magnetic flux lines in the Z-axis direction, while the other may not have a blind spot of the magnetic flux lines in the Z-axis direction. For example, if the second transmitting coil 2 has a blind spot, the third transmitting coil 3 has no blind spot, so the third transmitting coil 3 can make up for the blind spot of the second transmitting coil 2. Alternatively, if the third transmitting coil 3 has a blind spot, the second transmitting coil 2 has no blind spot, so the second transmitting coil 2 can make up for the blind spot of the third transmitting coil 3.

[0070] In this embodiment, since the first transmitting coil 1, the second transmitting coil 2 and the third transmitting coil 3 work at the same time, a superposition field and two repulsive fields with different blind areas can be generated at the same time, and there is no mode switching, thereby avoiding the problem of spikes in the detected amplitude data due to mode switching. At the same time, by adding the third transmitting coil 3, the third transmitting coil 3 can compensate for the blind area with the second transmitting coil 2, thereby reducing the range of the blind area as a whole, thereby reducing the false alarm rate.

[0071] Furthermore, the first transmitting coil 1, the second transmitting coil 2 and the third transmitting coil 3 in the same transmitting coil group are arranged along the Y-axis direction. It should be noted that there is no limitation on the order in which the third transmitting coil 3, the first transmitting coil 1 and the second transmitting coil 2 in the same transmitting coil group are arranged along the Y-axis direction. For example, the first transmitting coil 1, the second transmitting coil 2 and the third transmitting coil 3 in the same transmitting coil group can be arranged in sequence along the positive direction of the Y-axis, or the third transmitting coil 3, the second transmitting coil 2 and the first transmitting coil 1 in the same transmitting coil group can be arranged in sequence along the positive direction of the Y-axis. Figure 8 and Fig.10 What is shown in the figure is that the first transmitting coil 1, the second transmitting coil 2 and the third transmitting coil 3 in the same transmitting coil group are arranged in sequence along the positive direction of the Y axis. Since the first transmitting coil 1, the second transmitting coil 2 and the third transmitting coil 3 in the same transmitting coil group are arranged along the Y axis, it can be ensured that after a pedestrian passes through the detection channel, he will definitely pass through the first transmitting coil 1, the second transmitting coil 2 and the third transmitting coil 3, thereby ensuring that the magnetic fields on the X axis, the Y axis and two different Z axes can be used for all-round and accurate detection to avoid missed reports.

[0072] In one embodiment, in the coil structure, the second transmitting coil 2 and the third transmitting coil 3 both include first conducting wires along the Y-axis direction. And the area between two adjacent first conducting wires with opposite current directions in the second transmitting coil 2 and the area between two adjacent first conducting wires with opposite current directions in the third transmitting coil 3 are located at different positions on the Z-axis.

[0073] Reference Fig.10 and Figure 2 Taking the first door panel 10 as an example, the area between two adjacent first conducting wires with opposite current directions (such as conducting wire a and conducting wire b) in the second transmitting coil 2 and the area between two adjacent first conducting wires with opposite current directions (such as conducting wire c and conducting wire d; conducting wire e and conducting wire f) in the third transmitting coil 3 are located at different positions on the Z axis.

[0074] Among them, different parts located on the Z axis can be understood as having at least different height ranges. In other words, for the area between two adjacent first conducting wires with opposite current directions in the second transmitting coil 2 (referred to as the former), and the area between two adjacent first conducting wires with opposite current directions in the third transmitting coil 3 (referred to as the latter), the height ranges of the former and the latter are completely different (for example, the former is distributed in the area of ​​100cm to 120cm along the Z axis, and the latter is distributed in the area of ​​140cm to 160cm along the Z axis), or at least part of the height range is different (for example, the former is distributed in the area of ​​100cm to 120cm along the Z axis, and the latter is distributed in the area of ​​110cm to 130cm along the Z axis). Since the first conducting wires of the two current directions will generate blind areas, the height distribution areas of the blind areas generated by the two are at least partially different, and at least part of the blind area of ​​the second transmitting coil 2 will be compensated by the third transmitting coil 3, that is, at least part of the area that the second transmitting coil 2 cannot detect can be detected by the third transmitting coil 3, thereby reducing the range of the blind area as a whole. For example, if the former is distributed in the area of ​​100cm to 120cm along the Z axis, and the latter is distributed in the area of ​​110cm to 130cm along the Z axis, then the blind area corresponding to the area of ​​110cm to 120cm of the former can be compensated by the latter.

[0075] In order to enable those skilled in the art to better understand the coil structure in the embodiment of the present application, the scheme in the embodiment of the present application is described below using a specific third transmitting coil 3. The projections of each second sub-coil in the second transmitting coil 2 on the plane formed by the Y axis and the Z axis are arranged one by one (refer to Figure 4 , Fig.10 ), the third transmitting coil 3 includes a plurality of sub-coil groups 31, and adjacent sub-coil groups 31 are arranged at intervals (such as Fig.10 shown) or overlap settings ( Fig.10 (not shown), the directions of the currents of adjacent sub-coil groups 31 are opposite. There is no limitation on the number of sub-coil groups 31 in the third transmitting coil 3 and the specific structure of each sub-coil group 31, which are determined according to actual conditions. There is no limitation on the direction of the current in each sub-coil group 31, as long as the directions of the currents of adjacent sub-coil groups 31 are opposite. The sub-coil group 31 includes a plurality of third sub-coils whose projections on the plane formed by the Y-axis and the Z-axis intersect, and the current directions of the third sub-coils in the same sub-coil group 31 are the same. Among them, the third sub-coils may be in the same plane or not in the same plane with each other, as long as the projections intersect.

[0076] Figures 8 to 10In the embodiment, the third transmitting coil 3 includes two sub-coil groups 31 arranged at intervals, and each sub-coil group 31 includes two third sub-coils 311 and 312 with overlapping areas. The third transmitting coil 3 on the first door panel 10 and the third transmitting coil 3 on the second door panel 20 both include two upper and lower sub-coil groups 31, and each sub-coil group 31 includes two third sub-coils, namely, third sub-coils 311 and 312. The current directions of the two adjacent sub-coil groups 31 of the third transmitting coil 3 of the first door panel 10 are opposite. Specifically, the current directions of the sub-coil groups 31 on the upper part of the third transmitting coil 3 of the first door panel 10 are all counterclockwise, and the current directions of the sub-coil groups 31 on the lower part of the third transmitting coil 3 of the first door panel 10 are all clockwise. The current directions of the sub-coil groups 31 on the upper part of the third transmitting coil 3 of the second door panel 20 are all clockwise, and the current directions of the sub-coil groups 31 on the lower part of the third transmitting coil 3 of the second door panel 20 are all counterclockwise. Figures 8 to 10 FIG. 3 shows a situation where two adjacent sub-coil groups 31 are arranged at an interval.

[0077] Combination Figure 2 and Fig.10 , the blind area formed between the two adjacent first conducting wires c and the first conducting wire d with opposite current directions in the third transmitting coil 3 can be compensated by the magnetic field generated by the first conducting wires above the first conducting wire a in the second transmitting coil 2 (the current directions of the first conducting wires above the conducting wire a in the second transmitting coil 2 are all the same). The blind area formed between the two adjacent first conducting wires e and the first conducting wire f with opposite current directions in the third transmitting coil 3 can be compensated by the magnetic field generated by the first conducting wires below the conducting wire b in the second transmitting coil 2 (the current directions of the first conducting wires below the first conducting wire b in the second transmitting coil 2 are all the same). The blind area formed between the two adjacent first conducting wires a and the first conducting wire b with opposite current directions in the second transmitting coil 2 can be compensated by the magnetic field generated by the first conducting wires between the first conducting wire d and the first conducting wire e in the third transmitting coil 3 (such as the first conducting wire g and the first conducting wire h with the same current direction). It can be seen that in this embodiment, by staggering the blind area positions of the second transmitting coil 2 and the third transmitting coil 3, the blind area compensation between the second transmitting coil 2 and the third transmitting coil 3 is achieved.

[0078] In a specific implementation, when a target passes through the coil structure along the Y-axis direction, if it first passes through the second transmitting coil 2 and then passes through the third transmitting coil 3, although the target cannot be detected in the middle area corresponding to the second transmitting coil 2, when it passes through the third transmitting coil 3 again, the middle area can be detected by the magnetic field generated by the first conducting wire g and the first conducting wire h in the third transmitting coil 3, which is equivalent to the third transmitting coil 3 making up for the area that cannot be detected by the second transmitting coil 2.

[0079] If the target object first passes through the third transmitting coil 3 and then passes through the second transmitting coil 2, although the relatively upper area (i.e., the area corresponding to the first conducting wire c and the first conducting wire d) and the relatively lower area (i.e., the area corresponding to the first conducting wire e and the first conducting wire f) cannot be detected when passing through the third transmitting coil 3, after passing through the second transmitting coil 2, it will be detected by the magnetic field generated by the first conducting wire above the first conducting wire a and the first conducting wire below the first conducting wire b, which is equivalent to the second transmitting coil 2 making up for the area that the third transmitting coil 3 cannot detect.

[0080] In other embodiments, two adjacent sub-coil groups 31 may also be arranged to overlap (for example, Figures 8 to 10 As shown in the figure, the upper sub-coil group 31 and the lower sub-coil group 31 are close to and overlap each other, and the third sub-coil 312 in the upper sub-coil group 31 overlaps with the third sub-coil 311 in the lower sub-coil group 31). Since the current direction of the first conducting line g is the same as that of the first conducting line h, the overlapping arrangement of two adjacent sub-coil groups 31 will not affect the magnetic flux lines in the Z-axis direction, and the functions of the above-mentioned embodiment can still be achieved.

[0081] In order to ensure that the blind area can be completely compensated by the blind area of ​​the second transmitting coil 2 on the Z axis, in implementation, each third sub-coil includes a first conducting line along the Y axis direction, and two adjacent currents in adjacent third sub-coils flow in the same first conducting line (hereinafter referred to as the first one, such as Fig.10 The range of the area between the first conducting wire g and the first conducting wire h) in the Z axis covers the range of the area between two adjacent conducting wires with opposite current directions in the second transmitting coil 2 (hereinafter referred to as the second, such as the first conducting wire a and the first conducting wire b on the first door panel 10). The range of the Z axis refers to the area distributed on the Z axis. The range of the first in the Z axis covers the range of the second in the Z axis, including: the range of the first in the Z axis is equal to the range of the second in the Z axis (such as the range of the former and the latter in the Z axis are both 100cm-120cm), or the range of the first in the Z axis is greater than the range of the second in the Z axis (such as the range of the first in the Z axis is 95cm-125cm, and the range of the second in the Z axis is 100cm-120cm). Fig.10 As shown, the first conducting line g and the first conducting line h of the third transmitting coil 3 can completely make up for the blind area caused by the first conducting line a and the first conducting line b of the second transmitting coil 2 .

[0082] In order to further effectively reduce the resistance of the entire coil structure, reduce power consumption, and also achieve normal detection without excessive driving voltage, thereby improving electromagnetic conversion efficiency, in implementation, the first transmitting coil 1 is formed by winding a first wire, the second transmitting coil 2 is formed by winding a second wire, and the third transmitting coil 3 is formed by winding a third wire, and in the same group of transmitting coils, the first wire, the second wire and the third wire are connected to the same power interface.

[0083] For the coil structure provided in the second embodiment, its working mode is to control the first transmitting coil 1, the second transmitting coil 2 and the third transmitting coil 3 in the two relatively arranged transmitting coil groups to be energized, and the current directions of the two relatively arranged first transmitting coils 1 are the same, the current directions of the two relatively arranged second transmitting coils 2 are opposite, and the current directions of the two relatively arranged third transmitting coils 3 are opposite. The magnetic flux lines formed by the relatively first transmitting coils 1 and the relatively second transmitting coils 2 in the directions of the X-axis, Y-axis and Z-axis are the same as those in the first embodiment, and refer to Figures 5 to 7 , I will not go into details here.

[0084] The two opposite third transmitting coils 3 form a repulsive field, such as Fig.10 As shown, the sub-coil group 31 at the top of the first door panel 10 has an opposite current direction to the sub-coil group 31 at the top of the second door panel 20, and the sub-coil group 31 at the bottom of the first door panel 10 has an opposite current direction to the sub-coil group 31 at the bottom of the second door panel 20. The first current conducting wire d of the third sub-coil 311 has an opposite current direction to the first current conducting wire c of the third sub-coil 312. Therefore, there is a blind spot for the magnetic flux lines in the Z-axis direction between the first current conducting wires c and d. Similarly, there is a blind spot for the magnetic flux lines in the Z-axis direction between the first current conducting wires e and f. At the same time, the current directions of the first current conducting wires g and h in the middle are the same, forming a Fig.11 The schematic diagram of the magnetic flux lines in the Z-axis direction is shown. It can be seen from the figure that the blind areas formed by the third transmitting coil 3 are located at two positions relatively upper and relatively lower, and there is no blind area in the middle area.

[0085] It should be noted that the difference between the first embodiment and the second embodiment is that a third transmitting coil 3 is added, and the blind areas in the Z-axis direction are located at the upper and lower parts respectively, while the blind area of ​​the Z-axis of the second transmitting coil 2 is in the middle part. When the target passes through the coil structure, with the cooperation of the second transmitting coil 2 and the third transmitting coil 3, substantially all areas in the Z-axis direction can be detected (such as: although the second transmitting coil 2 cannot detect the middle area, the third transmitting coil 3 can detect the middle area), which is equivalent to no blind area in the Z-axis direction. Therefore, the second embodiment can realize the detection of no blind areas in the X-axis, Y-axis and Z-axis directions when the target passes through the detection channel between the coil structures along the Y-axis direction. Since the use of three transmitting coils can ensure that there are no blind areas in the X-axis, Y-axis and Z-axis directions, a coil structure including three transmitting coils as provided in the embodiment of the present application can be used for more accurate detection.

[0086] The coil structure is described above. This embodiment also provides a through-type detector, such as Figure 1 As shown, including the following.

[0087] The door panel structure includes a first door panel 10 and a second door panel 20 .

[0088] As in the coil structures of the above-mentioned embodiments, one set of transmitting coil groups is disposed in the first door panel 10 , and another set of transmitting coil groups is disposed in the second door panel 20 .

[0089] The embodiment of the through-type detector provided in this embodiment has the same technical features as the coil structure described above. The embodiment of the coil structure has been described in detail above, and the embodiment of the through-type detector will not be repeated here, and has the same beneficial effects as the coil structure mentioned above.

[0090] The above is a detailed introduction to a coil structure and a pass-through detector provided by the present application. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the present application.

[0091] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. A coil structure, characterized in that: Includes: two sets of transmitting coil groups; Each of the transmitting coil groups includes a first transmitting coil and a second transmitting coil, and the first transmitting coil and the second transmitting coil are placed without overlap or partially overlap; the first transmitting coils in the two transmitting coil groups are arranged opposite to each other, and the second transmitting coils in the two transmitting coil groups are arranged opposite to each other; The directions of the currents of the two first transmitting coils arranged opposite to each other are the same; The directions of the currents of the two second transmitting coils arranged opposite to each other are opposite.

2. The coil structure according to claim 1, characterized in that: The first transmitting coil and the second transmitting coil are placed without overlapping.

3. The coil structure according to claim 1, characterized in that: The first transmitting coil comprises a plurality of first sub-coils, the projections of the plurality of first sub-coils on the plane formed by the Y-axis and the Z-axis are arranged in a circle, and the current directions of the first sub-coils are the same; The second transmitting coil includes a plurality of second sub-coils, and projections of the plurality of second sub-coils on a plane formed by the Y axis and the Z axis are arranged in a circle, and current directions of the second sub-coils in one second transmitting coil are the same.

4. The coil structure according to claim 1, characterized in that: The first transmitting coil and the second transmitting coil in the same transmitting coil group are arranged along the Y-axis direction.

5. The coil structure according to claim 1, characterized in that: The first transmitting coil is formed by winding a first conductive wire, and the second transmitting coil is formed by winding a second conductive wire. In the same transmitting coil group, the first conductive wire and the second conductive wire are connected to the same power interface.

6. The coil structure according to claim 1, characterized in that: The first transmitting coil and the second transmitting coil in each group of the transmitting coils are formed by winding a wire.

7. The coil structure according to claim 1, characterized in that: Each of the transmitting coil groups further includes a third transmitting coil, and the third transmitting coil is placed without overlapping or partially overlapping with the first transmitting coil, and the third transmitting coil is placed without overlapping or partially overlapping with the second transmitting coil, and the third transmitting coils in the two transmitting coil groups are arranged opposite to each other; the current directions of the two opposite third transmitting coils are opposite; In the same group of transmitting coils, the position of the blind area of ​​the magnetic flux lines in the Z-axis direction of the second transmitting coil is different from the position of the blind area of ​​the magnetic flux lines in the Z-axis direction of the third transmitting coil; or, one of the second transmitting coil and the third transmitting coil has a blind area of ​​the magnetic flux lines in the Z-axis direction, and the other does not have a blind area of ​​the magnetic flux lines in the Z-axis direction.

8. The coil structure according to claim 7, characterized in that: The first transmitting coil, the second transmitting coil, and the third transmitting coil in the same group of transmitting coils are arranged along the Y-axis direction.

9. The coil structure according to claim 7, characterized in that: The second transmitting coil and the third transmitting coil both include a first conducting wire along the Y-axis direction; and a region between two adjacent first conducting wires with opposite current directions in the second transmitting coil and a region between two adjacent first conducting wires with opposite current directions in the third transmitting coil are located at different positions on the Z-axis.

10. The coil structure according to claim 7, characterized in that: The projections of the second sub-coils in the second transmitting coil on the plane formed by the Y-axis and the Z-axis are arranged one by one. The third transmitting coil includes a plurality of sub-coil groups, and adjacent sub-coil groups are arranged at intervals or overlapped, and the directions of the currents of adjacent sub-coil groups are opposite.

11. The coil structure according to claim 10, characterized in that: The sub-coil group includes a plurality of third sub-coils whose projections on the plane formed by the Y axis and the Z axis intersect with each other, and the current directions of the third sub-coils in the same sub-coil group are the same.

12. The coil structure according to claim 11, characterized in that: Each of the third sub-coils includes a first conducting line along the Y-axis direction, and an area between two adjacent first conducting lines with the same current flow direction in adjacent third sub-coils is within the range of the Z-axis, covering an area between two adjacent first conducting lines with opposite current directions in the second transmitting coil within the range of the Z-axis.

13. The coil structure according to claim 7, characterized in that: The first transmitting coil is formed by winding a first wire, the second transmitting coil is formed by winding a second wire, and the third transmitting coil is formed by winding a third wire. In the same group of transmitting coils, the first wire, the second wire and the third wire are connected to the same power interface.

14. A pass-through detector, characterized in that: include: A door panel structure, the door panel structure comprising a first door panel and a second door panel; The coil structure according to any one of claims 1 to 13, wherein: One group of the transmitting coil groups is arranged in the first door panel, and another group of the transmitting coil groups is arranged in the second door panel.

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