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. Based on a coil arrangement mode that a first transmitting coil group and a second transmitting coil group are overlapped, the position of the first transmitting coil group in a blind area of a magnetic induction line in a Z-axis direction is different from the position of the second transmitting coil group in the blind area of the magnetic induction line in the Z-axis direction; and at least one blind area is opposite to the intersection area of the first transmitting coil group and the second transmitting coil group. Therefore, the first transmitting coil group and the second transmitting coil group can make up for each other in a blind area of a magnetic induction line in the Z-axis direction, so that the range of the Z-axis blind area is narrowed on the whole, the probability that a target object is monitored in various postures is improved, the monitoring sensitivity and reliability are improved, and practical production and application are facilitated.

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 metals or contraband, such as setting up a pass-through detector 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. However, 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, the cross-section of the metal panel or mobile phone passing through the horizontal magnetic lines of force is very small at this time, and the magnetic lines of force passing through are small, so the eddy current effect generated is small, and the eddy current signal detected 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 results of the detector.

[0006] In order to solve the above technical problems, an embodiment of the present application provides a coil structure, including a transmitting coil group, which can be arranged on a side door panel of a pass-through detection device; the transmitting coil group includes a first transmitting coil group and a second transmitting coil group; the first transmitting coil group and the second transmitting coil group are placed overlappingly;

[0007] The position of the blind area of ​​the magnetic flux lines of the first transmitting coil group in the Z-axis direction is different from the position of the blind area of ​​the magnetic flux lines of the second transmitting coil group in the Z-axis direction, and at least one blind area of ​​the magnetic flux lines in the Z-axis direction is opposite to the intersection area of ​​the first transmitting coil group and the second transmitting coil group.

[0008] Further, the first transmitting coil group and the second transmitting coil group both include a first conducting wire along the Y-axis direction; and a projection of a region between two adjacent first conducting wires with opposite current directions in the first transmitting coil group on a plane formed by the Y-axis and the Z-axis does not intersect or partially intersects with a projection of a region between two adjacent first conducting wires with opposite current directions in the second transmitting coil group on a plane formed by the Y-axis and the Z-axis.

[0009] Further, the first transmitting coil group includes a plurality of first sub-coils, the first sub-coils include the first conducting wire and the second conducting wire extending along the Z-axis direction, the first conducting wire and the second conducting wire are connected; the projections of the first sub-coils on the plane formed by the Y-axis and the Z-axis are arranged in a circle, and the directions of the currents flowing through the first sub-coils are the same;

[0010] The second transmitting coil group includes a plurality of sub-coil groups, each of which is arranged in sequence along the Z axis, and two adjacent sub-coil groups are arranged at intervals or overlapped, and the directions of currents of adjacent sub-coil groups are opposite.

[0011] Furthermore, each of the sub-coil groups includes a plurality of second sub-coils whose projections on the plane formed by the Y-axis and the Z-axis intersect, and the current directions of the second sub-coils are the same; the second sub-coil includes the first conducting wire and a second conducting wire along the Z-axis direction; the first conducting wire and the second conducting wire are connected.

[0012] Furthermore, a projection of an area between two adjacent first conducting lines with the same current flow direction in two adjacent or intersecting second sub-coils on a plane formed by the Y axis and the Z axis intersects with a projection of an area between two adjacent first conducting lines with opposite current flow directions in the first transmitting coil group on a plane formed by the Y axis and the Z axis.

[0013] Furthermore, a projection of an area between two adjacent first conducting lines with the same current flow direction in two adjacent or intersecting second sub-coils on a plane formed by the Y axis and the Z axis covers a projection of an area between two adjacent first conducting lines with opposite current flow directions in the first transmitting coil group on a plane formed by the Y axis and the Z axis.

[0014] Further, a projection of a region between two adjacent first conducting wires in the first transmitting coil group with the same current flow direction on a plane formed by the Y axis and the Z axis intersects with a projection of a region between two adjacent first conducting wires in the second transmitting coil group with opposite current flow directions on a plane formed by the Y axis and the Z axis.

[0015] Further, a projection of an area between two adjacent first conducting lines with the same current flow direction in the first transmitting coil group on a plane formed by the Y axis and the Z axis covers a projection of an area between two adjacent first conducting lines with opposite current flow directions in the second transmitting coil group on a plane formed by the Y axis and the Z axis.

[0016] Further, the coil structure includes two groups of transmitting coil groups arranged opposite to each other, and the direction of the current flowing through the first transmitting coil group in the transmitting coil groups arranged opposite to each other is switched between the same and opposite directions, and the direction of the current flowing through the second transmitting coil group in the transmitting coil groups arranged opposite to each other.

[0017] Further, the first transmitting coil group is formed by winding a first conductive wire, the second transmitting coil group is formed by winding a second conductive wire, and the first conductive wire and the second conductive wire are connected to the same power interface.

[0018] In order to solve the above technical problems, the embodiment of the present application further provides a pass-through detector, including:

[0019] A door panel structure, the door panel structure comprising a first door panel and a second door panel;

[0020] As in the coil structure described above, wherein the coil structure comprises two groups of transmitting coil groups arranged opposite to each other, one group of the transmitting coil groups is arranged in the first door panel, and the other group of the transmitting coil groups is arranged in the second door panel.

[0021] A coil structure provided in an embodiment of the present application includes a transmitting coil group, wherein the transmitting coil group includes a first transmitting coil group and a second transmitting coil group. The first transmitting coil group and the second transmitting coil group are placed overlappingly. The position of the blind area of ​​the magnetic flux line of the first transmitting coil group in the Z-axis direction is different from the position of the blind area of ​​the magnetic flux line of the second transmitting coil group in the Z-axis direction.

[0022] Based on the coil arrangement method in which the first transmitting coil group and the second transmitting coil group are overlapped, since the position of the blind area of ​​the magnetic flux lines of the first transmitting coil group in the Z-axis direction is different from the position of the blind area of ​​the magnetic flux lines of the second transmitting coil group in the Z-axis direction, and at least one blind area is opposite to the intersection area of ​​the first transmitting coil group and the second transmitting coil group. Therefore, the first transmitting coil group can compensate for the blind area of ​​the magnetic flux lines of the second transmitting coil group in the Z-axis direction, thereby reducing the range of the Z-axis blind area as a whole, increasing the probability of the target being monitored in multiple postures, improving the sensitivity and reliability of monitoring, and facilitating practical production applications.

[0023] In addition, 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

[0024] 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.

[0025] Figure 1 A schematic diagram of a pass-through detector provided in an embodiment of the present application;

[0026] Figure 2 An exploded diagram of a coil structure provided in an embodiment of the present application;

[0027] Figure 3 for Figure 2 A schematic diagram showing a first transmitting coil group in the coil structure forming a superposition field;

[0028] Figure 4 for Figure 2 A schematic diagram of a first transmitting coil group in the coil structure forming a repulsive field;

[0029] Figure 5 for Figure 2 A schematic diagram of a second transmitting coil group in the coil structure forming a repulsive field;

[0030] Figure 6 for Figure 2 The schematic diagram of the magnetic flux lines in the X-axis direction of the coil structure shown in the working mode;

[0031] Figure 7 for Figure 2 The schematic diagram of the magnetic flux lines in the Y-axis direction of the coil structure shown in the working mode 2;

[0032] Figure 8 for Figure 2 The schematic diagram of the magnetic flux lines in the Z-axis direction of the coil structure shown in the second working mode;

[0033] Fig. 9 for Figure 2 The schematic diagram of the magnetic flux lines in the Z-axis direction of the coil structure shown in the working mode three;

[0034] Fig.10 A schematic diagram of a coil structure provided in another embodiment.

[0035] Among them, the figure numbers are as follows: 10 is a first door panel, 20 is a second door panel, 30 is a top panel, 1 is a transmitting coil group, 11 is a first transmitting coil group, 12 is a second transmitting coil group, 111, 112, 113, 114 are respectively first sub-coils on the first transmitting coil group 11, 121 is a sub-coil group on the second transmitting coil group 12, and 1211, 1212 are respectively second sub-coils in the sub-coil groups. DETAILED DESCRIPTION

[0036] 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.

[0037] The core of this application is to provide a coil structure and a through-type detector to solve the technical problem of low reliability of the detector detection results.

[0038] 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.

[0039] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. The present application embodiment provides a coil structure, including a transmitting coil group 1. The transmitting coil group 1 can be set on a side door panel of a pass-through detection device. It should be noted that the transmitting coil group 1 provided here on behalf of the present embodiment can not only be applied to pass-through detection equipment, but also can be used by other products or scenes that need to use coils to detect the transmitting coil group 1.

[0040] The transmitting coil group 1 includes a first transmitting coil group 11 and a second transmitting coil group 12. The first transmitting coil group 11 and the second transmitting coil group 12 are placed overlapping. The position of the blind area of ​​the magnetic flux line of the first transmitting coil group 11 in the Z-axis direction is different from the position of the blind area of ​​the magnetic flux line of the second transmitting coil group 12 in the Z-axis direction, and at least one blind area is opposite to the intersection area of ​​the first transmitting coil group 11 and the second transmitting coil group 12.

[0041] In the traditional coil structure for detection, the magnetic flux lines inside the detector are distributed between the two door panels, basically along the horizontal direction, that is, the X-axis direction, and there are a lot of blind spots in the Y-axis direction and the Z-axis direction, which causes the detector to miss the detection phenomenon. Therefore, the transmitting coil group 1 in the embodiment of the present application includes a first transmitting coil group 11 and a second transmitting coil group 12. For the convenience of describing 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 1 A schematic diagram of a pass-through detector provided in an embodiment of the present application, such as 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 detection channel is provided between the first door panel 10 and the second door panel 20. Transmitting coil groups 1 are respectively provided on the first door panel 10 and the second door panel 20. The Y axis is parallel to the bottom edge m of the first door panel 10 (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 first door panel 10, and the Z axis is parallel to the side edge n of the first door panel 10. 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 actual conditions.

[0042] The first transmitting coil group 11 and the second transmitting coil group 12 are placed overlapping. There is no limitation on the structure of the first transmitting coil group 11, the structure of the second transmitting coil group 12, the position of the first transmitting coil group 11, the position of the second transmitting coil group 12, the direction of the current in the first transmitting coil group 11, the direction of the current in the second transmitting coil group 12, etc., which are determined according to actual conditions.

[0043] Specifically, the overlapping arrangement includes the first transmitting coil group 11 and the second transmitting coil group 12 being completely overlapped (e.g., the entire second transmitting coil group 12 is overlapped on the first transmitting coil group 11) or partially overlapped (e.g., only a portion of the second transmitting coil group 12 is overlapped on the first transmitting coil group 11). The intersection area is the area where the first transmitting coil group 11 and the second transmitting coil group 12 overlap. Figure 1 , Figure 2 For example, the entire second transmitting coil group 12 is stacked on the first transmitting coil group 11. The area from the current line r to the current line q in the first transmitting coil group 11 and the area from the current line s to the current line t in the second transmitting coil group 12 are the intersection areas.

[0044] Of course, in other embodiments, if the second transmitting coil group 12 moves upward, or the second transmitting coil group 12 moves downward, then at this time, the first transmitting coil group 11 and the second transmitting coil group 12 partially overlap, and the intersection area is only the area where the first transmitting coil group 11 and part of the second transmitting coil group 12 overlap.

[0045] Among them, the blind area of ​​the magnetic flux lines in the Z-axis direction refers to the absence of magnetic flux lines in the Z-axis direction in the blind area. For the convenience of description, the "blind area of ​​the magnetic flux lines in the Z-axis direction" is referred to as the Z-axis blind area below. The Z-axis blind area is within the detection area, for example, in the detection channel of a pass-through detector. Therefore, if the target object happens to be in the Z-axis blind area when passing through the detection channel, the target object cannot be detected. In this embodiment, the Z-axis blind area positions of the first transmitting coil group 11 and the second transmitting coil group 12 are different, which means that between the first transmitting coil group 11 and the second transmitting coil group 12, the position of at least one Z-axis blind area of ​​one is different from the position of all Z-axis blind areas of the other. Among them, the two Z-axis blind areas are in different positions, including that the two Z-axis blind areas do not overlap at all, or that the two Z-axis blind areas partially overlap. As Figure 2 , Figure 4 , Figure 6As shown in , the Z-axis blind area A corresponding to the first transmitting coil group 11 and the Z-axis blind area B on the second transmitting coil group 12 are completely non-overlapping. Similarly, the Z-axis blind area A and the Z-axis blind area C are also completely non-overlapping. Alternatively, if the first transmitting coil group 11 has a Z-axis blind area covering a height of [1m, 1.3m], and the second transmitting coil group 12 has a Z-axis blind area covering a height of [1m, 1.1m] that is, the heights of the two Z-axis blind areas intersect but are not exactly the same, this situation also belongs to the situation that the positions of the two Z-axis blind areas are different, and it belongs to the protection scope of this embodiment. Of course, if the height of any Z-axis blind area of ​​the second transmitting coil group 12 is not within the range of [1m, 1.3m], it also belongs to the protection scope of this embodiment. In addition, the position referred to in this embodiment mainly refers to the position of the Z axis. In other words, as long as the positions of the Z axes of the two Z-axis blind areas are different, the positions of the two Z-axis blind areas are considered to be different.

[0046] It should be understood that the "blind area" mentioned in this embodiment refers to a spatial area. Figure 4 As shown, taking the Z-axis blind area A as an example, when the first transmitting coil group 11 on the first door panel 10 and the first transmitting coil group 11 on the second door panel 20 are working, a Z-axis blind area A extending along the X-axis direction to the first transmitting coil group 11 on the second door panel 20 will be formed between the current-carrying wire a and the current-carrying wire b of the first transmitting coil group 11 on the first door panel 10.

[0047] Similarly, if Figure 5 As shown, the Z-axis blind area B in this embodiment is a space area of ​​the second transmitting coil group 12 formed along the X-axis direction and extending to the other side door panel between the conducting wires c and d on one side door panel when the second transmitting coil group 12 on the two side door panels is working. The Z-axis blind area C is a space area of ​​the second transmitting coil group 12 formed along the X-axis direction and extending to the other side door panel between the conducting wires e and f on one side door panel when the second transmitting coil group 12 on the two side door panels is working.

[0048] In this embodiment, in addition to the different positions of the Z-axis blind areas of the first transmitting coil group 11 and the second transmitting coil group 12, it is also defined that at least one Z-axis blind area is opposite to the intersection area of ​​the first transmitting coil group 11 and the second transmitting coil group 12. In other words, the height of at least one Z-axis blind area along the Z-axis intersects with the height of the intersection area along the Z-axis. It should be noted that the intersection area here is not limited to the entire intersection area between the first transmitting coil group 11 and the second transmitting coil group 12, and a partial intersection area is also acceptable, that is, as long as the first transmitting coil group 11 and the second transmitting coil group 12 overlap within the height range of the Z-axis blind area. If the first transmitting coil group 11 has a Z-axis blind area opposite to the intersection area, the Z-axis blind area can at least be opposite to the second transmitting coil group 12. If the second transmitting coil group 12 does not have a Z-axis blind area at this position, the problem of the first transmitting coil group 11 having a Z-axis blind area at this position can be overcome by the second transmitting coil group 12.

[0049] Specifically, for example, the Z-axis blind area B of the second transmitting coil group 12 is located at Figure 5 The positions shown are combined Figure 1 , Figure 2 Since the Z-axis blind area B is opposite to the intersection area of ​​the first transmitting coil group 11 and the second transmitting coil group 12, specifically, it is opposite to the area between the current line 1 and the current line k in the first transmitting coil group 11. If the current line 1 and the current line k have the same direction, then these two current lines will not generate a Z-axis blind area. In this way, the first transmitting coil group 11 and the second transmitting coil group 12 are energized in sequence, and the first transmitting coil group 11 can make up for the Z-axis blind area B of the second transmitting coil group 12. In other words, if the target object is in the Z-axis blind area B, although the second transmitting coil group 12 does not transmit the Z-axis magnetic flux lines to the target object, the first transmitting coil group 11 can transmit magnetic flux lines to the target object.

[0050] 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 2 An exploded diagram of a transmitting coil structure provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, the transmitting coil group 1 includes a first transmitting coil group 11 and a second transmitting coil group 12. The first transmitting coil group 11 and the second transmitting coil group 12 both include a first conducting line along the Y-axis direction (as shown in FIG. Figure 2 The live wires a and b in the first transmitting coil group 11, and the live wires c, d, e, and f in the second transmitting coil group 12).

[0051] In order to improve the reliability of the detection results obtained when using the coil structure for detection. In the embodiment of the present application, the position of the Z-axis blind area of ​​the first transmitting coil group 11 is different from the position of the Z-axis blind area of ​​the second transmitting coil group 12. It should be noted that in this embodiment, the Z-axis blind areas of the first transmitting coil group 11 and the second transmitting coil group 12 are generated by two adjacent current-carrying wires extending along the Y-axis direction and having opposite current directions.

[0052] refer to Figure 2 , Figure 4 , Figure 5 , it is assumed that two adjacent conducting wires a and b extending in the Y-axis direction and having opposite current directions in the first transmitting coil group 11 form a Z-axis blind area A in the Z-axis direction, and two adjacent conducting wires c and conducting wire d extending in the Y-axis direction and having opposite current directions in the second transmitting coil group 12 form a Z-axis blind area B in the Z-axis direction, and two adjacent conducting wires e and conducting wire f with opposite current directions form another Z-axis blind area C in the Z-axis direction. Among them, the Z-axis blind area A is located in the middle area of ​​the detection channel, while the Z-axis blind area B and the Z-axis blind area C are located in the upper and lower areas of the detection channel respectively, that is, the position of the Z-axis blind area A is different from the Z-axis blind area B and the Z-axis blind area C. Therefore, the second transmitting coil group 12 can detect the middle area that the first transmitting coil group 11 cannot detect. The first transmitting coil group 11 can detect the upper and lower areas that the second transmitting coil group 12 cannot detect. Through the above setting, the first transmitting coil group 11 and the second transmitting coil group 12 can make up for each other's respective Z-axis blind areas.

[0053] In practice, although the Z-axis blind area of ​​the first transmitting coil group 11 and the Z-axis blind area of ​​the second transmitting coil group 12 are set at different positions, in order to ensure that the Z-axis blind area can be compensated by the other party as much as possible, this embodiment sets at least one blind area to be opposite to the intersection area of ​​the first transmitting coil group 11 and the second transmitting coil group 12. For example, the Z-axis blind area A of the first transmitting coil group 11 is opposite to the area between the live wires i and j in the second transmitting coil group 12, and the area between the live wires i and j is located in the intersection area, and the current directions of the live wires i and j are the same, and they can be detected normally. Therefore, under the mutual cooperation of the first transmitting coil group 11 and the second transmitting coil group 12, if the target passes through the channel area corresponding to the area between the live wires a and b (also corresponding to the area between the live wires i and j), it can be detected normally.

[0054] In the coil structure provided in this embodiment, the coil arrangement mode in which the first transmitting coil group 11 and the second transmitting coil group 12 are overlapped is adopted. Since the position of the Z-axis blind area of ​​the first transmitting coil group 11 is different from the position of the Z-axis blind area of ​​the second transmitting coil group 12, and at least one blind area is opposite to the intersection area of ​​the first transmitting coil group 11 and the second transmitting coil group 12, the first transmitting coil group 11 and the second transmitting coil group 12 can compensate for each other's Z-axis blind area, thereby improving the probability of the target object being monitored in various postures, improving the sensitivity and reliability of monitoring, and facilitating practical production applications.

[0055] In the above embodiment, the position of the Z-axis blind area of ​​the first transmitting coil group 11 does not overlap with the position of the Z-axis blind area of ​​the second transmitting coil group 12. However, in other embodiments not shown in the figure, the position of the Z-axis blind area of ​​the first transmitting coil group 11 and the position of the Z-axis blind area of ​​the second transmitting coil group 12 may partially overlap.

[0056] In order to make up for the blind area in the Z-axis direction as much as possible, in some embodiments, the projection of the area between two adjacent first conducting wires with opposite current directions in the first transmitting coil group 11 on the plane formed by the Y-axis and the Z-axis does not intersect or partially intersects with the projection of the area between two adjacent first conducting wires with opposite current directions in the second transmitting coil group 12 on the plane formed by the Y-axis and the Z-axis.

[0057] Since two adjacent first current-carrying wires with opposite current directions will generate a Z-axis blind zone, this embodiment is equivalent to limiting the Z-axis blind zone of the first transmitting coil group 11 to be non-intersecting or partially intersecting with the Z-axis blind zone of the second transmitting coil group 12. Figure 2 and Figure 4 As shown, the projection of the area between two adjacent first conducting wires (conducting wire a and conducting wire b) with opposite current directions in the first transmitting coil group 11 on the plane formed by the Y axis and the Z axis does not intersect with the projection of the area between two adjacent first conducting wires (the area between conducting wire c and conducting wire d or the area between conducting wire e and conducting wire f) with opposite current directions in the second transmitting coil group 12 on the plane formed by the Y axis and the Z axis, that is, the Z-axis blind area A does not intersect with the Z-axis blind area B, and the Z-axis blind area A does not intersect with the Z-axis blind area C. In the coil structure provided in this embodiment, by setting the Z-axis blind area of ​​the first transmitting coil group 11 and the Z-axis blind area of ​​the second transmitting coil group 12 not to intersect, the coil structure is guaranteed to have an effect equivalent to no blind area on the Z axis as much as possible, thereby improving the accuracy of coil structure detection.

[0058] In other embodiments, the Z-axis blind area of ​​the first transmitting coil group 11 and the Z-axis blind area of ​​the second transmitting coil group 12 may also partially intersect. If they partially intersect, it means that the Z-axis blind areas of the two partially intersect, and another part does not intersect. For the non-intersecting part, the first transmitting coil group 11 and the second transmitting coil group 12 can also compensate for each other's Z-axis blind area (the principle is similar to the above-mentioned non-intersecting, which will not be repeated here), and the effect of reducing the range of the Z-axis blind area can also be achieved.

[0059] Further, let's continue with Figure 2 The coil structure is provided for illustration. Figure 2 In the coil structure, the first transmitting coil group 11 and the second transmitting coil group 12 both further have a second conducting line along the Z-axis direction. Specifically, the second conducting line along the Z-axis direction in the first transmitting coil group 11 is such as conducting line g, and the second conducting line along the Z-axis direction in the second transmitting coil group 12 is such as conducting line h.

[0060] The first transmitting coil group 11 includes a plurality of first sub-coils, and the projections of the first sub-coils on the plane formed by the Y axis and the Z axis are arranged one by one, and the direction of the current flowing through them is the same. There is no limitation on the number of first sub-coils in the first transmitting coil group 11. All the first sub-coils may be located in the same plane or in different planes. The first sub-coil includes a first conducting wire and a second conducting wire, and the first conducting wire is connected to the second conducting wire. For example, the first sub-coil is rectangular in shape and is surrounded by two first conducting wires and two second conducting wires. Figure 2 1 shows that the first transmitting coil group 11 includes four first sub-coils, which are first sub-coils 111, 112, 113, and 114 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 the first transmitting coil group 11 is the same. Figure 3 for Figure 2 The schematic diagram of the first transmitting coil group 11 in the coil structure forming a superposition field is shown in FIG. Figure 3 As shown, the direction of the current of each first sub-coil in the first transmitting coil group 11 on the first door panel 10 is counterclockwise, and the direction of the current of each first sub-coil 11 on the second door panel 20 is counterclockwise. Figure 4 for Figure 2 The schematic diagram of the first transmitting coil group 11 in the coil structure forming a repulsive field is shown in FIG. Figure 4 As shown, the direction of the current of each first sub-coil in the first transmitting coil group 11 on the first door panel 10 is counterclockwise, and the direction of the current of each first sub-coil 11 on the second door panel 20 is clockwise.

[0061] The second transmitting coil group 12 includes a plurality of sub-coil groups 121 , each sub-coil group 121 is sequentially arranged along the Z axis, and two adjacent sub-coil groups 121 are arranged at intervals or overlapped, and the directions of the currents of adjacent sub-coil groups 121 are opposite.

[0062] There is no limitation on the number of sub-coil groups 121 in the second transmitting coil group 12 and the specific structure of each sub-coil group 121, which are determined according to actual conditions. There is no limitation on the direction of the current in each sub-coil group 121, as long as the directions of the currents in adjacent sub-coil groups 121 are opposite.

[0063] like Figure 3 As shown, since the first transmitting coil group 11 includes a plurality of first sub-coils which are arranged in a circle and have the same current direction, in the repulsive field mode, the two first conducting wires, namely the conducting wire a and the conducting wire b, in the first sub-coil (i.e., the first sub-coil 114) located in the innermost circle of the first transmitting coil group 11 are located in the middle and have opposite current directions, and the conducting wire a and the conducting wire b generate a Z-axis blind area A. At the same time, as Figure 5 As shown, since the second transmitting coil group 12 includes a plurality of sub-coil groups 121, and the current directions of two adjacent sub-coil groups 121 are opposite, if the number of the sub-coil groups 121 is two, the two sub-coil groups 121 can be arranged up and down along the Z-axis direction. In addition, the two sub-coil groups 121 have two adjacent first conducting wires, namely, conducting wire i and conducting wire j, and the current directions of conducting wire i and conducting wire j are the same and are located exactly in the middle, so that the Z-axis blind area of ​​conducting wire a and conducting wire b, which are also located in the middle of the first transmitting coil group 11, can be compensated.

[0064] Furthermore, each sub-coil group 121 includes a plurality of second sub-coils whose projections on the plane formed by the Y-axis and the Z-axis intersect, and the current direction in each second sub-coil is the same. All second sub-coils can be located in the same plane, or in different planes. The second sub-coil also includes a first conducting wire and a second conducting wire, and the first conducting wire and the second conducting wire are connected. For example: the second sub-coil is in the shape of a rectangle and is surrounded by two first conducting wires and two second conducting wires. Figure 2 , Figure 5 As shown, the second transmitting coil group 12 may specifically include two sub-coil groups 121 disposed at intervals, and each sub-coil group 121 includes two second sub-coils 1211 and 1212 that overlap each other. Figure 5 for Figure 2 A schematic diagram of the second transmitting coil group in the coil structure shown in FIG. Figure 5As shown, the second transmitting coil group 12 includes two sub-coil groups 121 arranged at an interval, and the current directions of the two sub-coil groups 121 are opposite, and the current directions of the second sub-coils 1211 and 1212 in each sub-coil group 121 are the same.

[0065] In other embodiments not shown in the figure, two adjacent sub-coil groups 121 may also be arranged to overlap, for example Figure 2 , Figure 5 There is an overlapping area between the upper sub-coil group 121 and the lower sub-coil group 121. Specifically, the overlapping area of ​​two adjacent sub-coil groups 121 can be formed by the second sub-coil 1212 in the upper sub-coil group 121 overlapping the second sub-coil 1211 in the lower sub-coil group 121. Since the current directions of the conducting wire i and the conducting wire j are the same, the overlapping arrangement of the two adjacent sub-coil groups 121 can also make up for the Z-axis blind area caused by the conducting wire a and the conducting wire b in the first sub-coil group 11.

[0066] Specifically, Figure 5 In the embodiment, the direction of the current of the second sub-coil 1211 and the direction of the current of the second sub-coil 1212 in the sub-coil group 121 at the upper part of the first door panel 10 are both counterclockwise, and the direction of the current of the second sub-coil 1211 and the direction of the current of the second sub-coil 1212 in the sub-coil group 121 at the lower part of the first door panel 10 are both clockwise. The direction of the current of the second sub-coil 1211 and the direction of the current of the second sub-coil 1212 in the sub-coil group 121 at the upper part of the second door panel 20 are both clockwise, and the direction of the current of the second sub-coil 1211 and the direction of the current of the second sub-coil 1212 in the sub-coil group 121 at the lower part of the second door panel 20 are both counterclockwise.

[0067] In order to enable the second transmitting coil group 12 to make up for the Z-axis blind area of ​​the first transmitting coil group 11, so as to improve the accuracy of the coil structure detection result. In some embodiments, the projection of the area between two adjacent first conducting lines with the same current flow direction in the adjacent or intersecting second sub-coils on the plane formed by the Y axis and the Z axis intersects with the projection of the area between two adjacent first conducting lines with opposite current directions in the first transmitting coil group 11 on the plane formed by the Y axis and the Z axis.

[0068] Among them, the two adjacent or intersecting second sub-coils can be two intersecting second sub-coils in the same sub-coil group. Alternatively, they can also be a second sub-coil in each of the two sub-coil groups, and the distance between the two second sub-coils is the shortest. In addition, if the two sub-coil groups intersect, the two second sub-coils also intersect. If the two sub-coil groups are arranged at intervals, the two second sub-coils are adjacent. Regarding two adjacent first conducting lines with the same current flow direction, one of the first conducting lines is located in one second sub-coil, and the other first conducting line is located in the other second sub-coil. Among them, the intersection of projections includes partial overlap of one, partial overlap of both, and complete coverage. Complete coverage means that all projections of the two are completely intersected. Partial overlap of one means that all projections of one intersect with the projection of the other and some projections of the other do not intersect. Partial overlap of the two means that only some projections of both intersect, which are all within the scope of protection of this application.

[0069] Specific reference Figure 1 , Figures 2 to 5 , taking the second transmitting coil group 12 on the first door panel 10 to compensate for the Z-axis blind area of ​​the first transmitting coil group 11 as an example, the process of compensating the Z-axis blind area is described. Specifically, the two adjacent first conducting wires with opposite current directions in the first transmitting coil group 11 are conducting wire a and conducting wire b, and conducting wire a and conducting wire b form the Z-axis blind area A. In order to compensate the Z-axis blind area A formed by the first transmitting coil group 11 by the second transmitting coil group 12, in the second transmitting coil group 12, the two intersecting second sub-coils (i.e., the second sub-coil 1211 and the second sub-coil 1212) in the upper sub-coil group 121 have two adjacent first conducting wires with the same current flow direction (i.e., conducting wire d and conducting wire i), and the partial area between conducting wire d and conducting wire i is opposite to the partial area between conducting wire a and conducting wire b in the first transmitting coil group 11, which belongs to the situation where the above two partially overlap, therefore, conducting wire d and conducting wire i can compensate for the Z-axis blind area A. In addition, the second sub-coil 1212 in the upper sub-coil group 121 is adjacent to the second sub-coil 1211 in the lower sub-coil group 121, and the two second sub-coils have two adjacent first conducting wires (i.e., conducting wire i and conducting wire j), and the entire area between conducting wire i and conducting wire j is opposite to the partial area between conducting wire a and conducting wire b, which is a case where one of the above partially overlaps. In this case, conducting wire i and conducting wire j can also compensate for the Z-axis blind area A.

[0070] The manner in which the second transmitting coil group 12 on the second door panel 20 compensates for the Z-axis blind area of ​​the first transmitting coil group 11 is the same as the manner in which the second transmitting coil group 12 on the first door panel 10 compensates for the Z-axis blind area of ​​the first transmitting coil group 11, and will not be repeated here.

[0071] Furthermore, in order to ensure that the Z-axis blind area can be completely compensated as much as possible, in the embodiment, the projection of the area between two adjacent first conducting lines with the same current flow direction in two adjacent or intersecting second sub-coils on the plane formed by the Y-axis and the Z-axis covers the projection of the area between two adjacent first conducting lines with opposite current directions in the first transmitting coil group 11 on the plane formed by the Y-axis and the Z-axis.

[0072] In this embodiment, two adjacent or intersecting second sub-coils may be located in different sub-coil groups, respectively. If the two sub-coil groups are spaced apart, the two second sub-coils are adjacent. If the two sub-coil groups intersect, the two second sub-coils intersect. The projection of the former (such as the area between the two first conducting lines with the same current flow direction) covers the projection of the latter (such as the area between the two adjacent first conducting lines with opposite current directions in the first transmitting coil group 11), which may include: the entire projection of the latter is within the projection of the former, and the projection area of ​​the former is larger than that of the latter. Alternatively, it may also mean that the projection areas of the two are the same and completely intersect. For example Fig.10 As shown, the projection of the area between the live wire i and the live wire j on the plane formed by the Y axis and the Z axis completely covers the projection of the area between the live wire a and the live wire b on the plane formed by the Y axis and the Z axis. In other words, the Z axis position of the area between the live wire i and the live wire j is exactly the same as the Z axis position of the area between the live wire a and the live wire b, thereby ensuring that the Z axis blind area A in the first transmitting coil group 11 can be completely compensated by the second transmitting coil group 12.

[0073] In order to further improve the accuracy of coil structure detection, the first transmitting coil group 11 is used in this embodiment to make up for the Z-axis blind area of ​​the second transmitting coil group 12. The projection of the area between two adjacent first conducting lines with the same current flow direction in the first transmitting coil group 11 on the plane formed by the Y-axis and the Z-axis intersects with the projection of the area between two adjacent first conducting lines with opposite current directions in the second transmitting coil group 12 on the plane formed by the Y-axis and the Z-axis. The intersection of projections includes partial overlap of one, partial overlap of both, and complete coverage, wherein complete coverage means that all projections of the two are completely intersected. Partial overlap of one means that all projections of one intersect with the projection of the other and some projections of the other do not intersect. Partial overlap of the two means that only some projections of both intersect, which are all within the protection scope of the present application. Reference Figure 2 , Figure 4 and Figure 5, taking the first transmitting coil group 11 on the first door panel 10 to compensate for the Z-axis blind area of ​​the second transmitting coil group 12 as an example, the blind area compensation process is explained. Specifically, the second transmitting coil group 12 has two adjacent first conducting wires with opposite current directions, such as conducting wire c and conducting wire d, which have a Z-axis blind area B, and the projection of the area between conducting wire c and conducting wire d on the plane formed by the Y axis and the Z axis intersects with the projection of the area between two adjacent conducting wires l and conducting wire k in the first transmitting coil group 11 with the same current flow direction on the plane formed by the Y axis and the Z axis, so conducting wire l and conducting wire k can achieve compensation for the Z-axis blind area B. And, combined with Figure 1 , the projection of the entire area between the conducting line l and the conducting line k intersects with the projection of a portion of the area between the conducting line c and the conducting line d, which belongs to the case where one of the above partially overlaps.

[0074] The second transmitting coil group 12 has two other adjacent first conducting wires with opposite current directions, such as conducting wire e and conducting wire f, which generate a Z-axis blind area C, and the projection of the area between conducting wire e and conducting wire f on the plane formed by the Y axis and the Z axis intersects with the projection of the area between two adjacent conducting wires o and conducting wire p with the same current flow direction in the first transmitting coil group 11 on the plane formed by the Y axis and the Z axis. Therefore, conducting wire o and conducting wire p can compensate for the Z-axis blind area C. In addition, in combination with Figure 1 , the projection of the entire area between the conducting line o and the conducting line p intersects with the projection of a part of the area between the conducting line e and the conducting line f, which belongs to the case of partial overlap of one of the above.

[0075] It can be seen that the Z-axis blind area of ​​the second transmitting coil group 12 is compensated by the first transmitting coil group 11 on the first door panel 10. The way in which the first transmitting coil group 11 on the second door panel 20 compensates the Z-axis blind area of ​​the second transmitting coil group 12 is the same as the way in which the first transmitting coil group 11 on the first door panel 10 compensates the Z-axis blind area of ​​the second transmitting coil group 12, and will not be repeated here.

[0076] Further, in order to ensure that the blind area can be completely compensated as much as possible, in the implementation, the projection of the area between two adjacent first conducting wires with the same current flow direction in the first transmitting coil group 11 on the plane formed by the Y axis and the Z axis covers the projection of the area between two adjacent first conducting wires with opposite current directions in the second transmitting coil group 12 on the plane formed by the Y axis and the Z axis. The projection of the former (such as the area between two adjacent first conducting wires with the same current flow direction in the first transmitting coil group 11) covers the projection of the latter (such as the area between two adjacent first conducting wires with opposite current directions in the second transmitting coil group 12) may include: all projections of the latter are within the projection of the former, and the projection area of ​​the former is larger than that of the latter, that is, the projection area of ​​the area between two adjacent first conducting wires with the same current flow direction in the first transmitting coil group 11 on the plane formed by the Y axis and the Z axis is larger than the projection area of ​​the area between two adjacent first conducting wires with opposite current directions in the second transmitting coil group 12 on the plane formed by the Y axis and the Z axis. Alternatively, it can also mean that the projection areas of the two are the same and completely intersect.

[0077] For example Fig.10 As shown, the projection of the area between the live wire l and the live wire k on the plane formed by the Y axis and the Z axis completely covers the projection of the area between the live wire c and the live wire d on the plane formed by the Y axis and the Z axis, ensuring that the Z-axis blind area B in the second transmitting coil group 12 can be completely compensated by the first transmitting coil group 11. As described above, the projection of the area between the live wire o and the live wire p on the plane formed by the Y axis and the Z axis completely covers the projection of the area between the live wire e and the live wire f on the plane formed by the Y axis and the Z axis, ensuring that the Z-axis blind area C in the second transmitting coil group 12 can be completely compensated by the first transmitting coil group 11.

[0078] In one embodiment, referring to the above Figures 1 to 5 The coil structure includes two sets of transmitting coil groups 1 arranged opposite to each other, and the directions of the currents flowing through the first transmitting coil groups 11 in the transmitting coil groups 1 arranged opposite to each other are in the same direction ( Figure 3 ) and vice versa ( Figure 4 ), the direction of the current flowing through the second transmitting coil group 12 in the relatively arranged transmitting coil group is opposite ( Figure 5 ).

[0079] Among them, the two groups of transmitting coil groups 1 can be located at the left and right ends respectively, so that there are two groups of first transmitting coil groups 11 and two groups of second transmitting coil groups 12 that are arranged oppositely. It should be noted that the first transmitting coil group 11 and the second transmitting coil group 12 can work alternately, that is, when the first transmitting coil group 11 that is arranged oppositely is working, the second transmitting coil group 12 that is arranged oppositely is not working. When the second transmitting coil group 12 that is arranged oppositely is working, the first transmitting coil group 11 that is arranged oppositely is not working. If the directions of the currents flowing through the two groups of first transmitting coil groups 11 are the same, a superposition field is formed (i.e., working mode one), which mainly generates magnetic field lines of the X component uniformly distributed in the detection channel, such as Figure 6 As shown, in this mode, there is no blind area in the magnetic flux lines in the X-axis direction. If the directions of the currents flowing through the two first transmitting coil groups 11 are opposite, a repulsive field is formed (working mode 2). At this time, in this mode, the directions of the currents of the vertically connected wires in the same column are the same, and there is no situation where the currents of the wires in the same column have opposite directions, such as Figure 7 As shown in the figure, there is no blind area in the Y-axis direction. However, regarding the Z-axis magnetic flux lines, there is a Z-axis blind area in the middle area, as shown in the figure. Figure 8 As shown. If the directions of the currents flowing through the two sets of second transmitting coil groups 12 arranged relatively to each other are opposite (working mode three), Z-axis blind areas will be generated in the upper and lower areas. However, since the positions of the Z-axis blind areas in working mode two (such as Z-axis blind area A) are different from the positions of the Z-axis blind areas in working mode three (such as Z-axis blind area B and Z-axis blind area C), it is equivalent to having no blind area in the Z-axis direction, thereby improving the accuracy of detection.

[0080] In implementation, in order to effectively reduce the resistance of the entire coil structure and reduce power consumption, and also to achieve normal detection without excessive driving voltage, thereby improving electromagnetic conversion efficiency, in some embodiments, the first transmitting coil group 11 is formed by winding a first wire, and the second transmitting coil group 12 is formed by winding a second wire, and the first wire and the second wire are connected to the same power interface.

[0081] In the coil structure provided in this embodiment, the first transmitting coil group 11 and the second transmitting coil group 12 are respectively wound by two wires and connected to the same power interface, that is, the first transmitting coil group 11 and the second transmitting coil group 12 are arranged in parallel, thereby effectively reducing the resistance of the entire coil structure and reducing power consumption. At the same time, it is also possible to perform normal detection without an excessively large driving voltage, thereby improving the electromagnetic conversion efficiency.

[0082] The coil structure described above can be switched alternately among the three working modes, and the three working modes have no particular order.

[0083] Specifically,

[0084] The three working modes include:

[0085] Working mode 1: the first transmitting coil group 11 in the relatively arranged transmitting coil groups 1 is controlled to be energized, and the second transmitting coil group 12 is controlled to be de-energized, and the directions of the currents flowing through the relatively arranged first transmitting coil groups 11 are the same.

[0086] Working mode 2: the first transmitting coil group 11 in the relatively arranged transmitting coil groups 1 is controlled to be energized, and the second transmitting coil group 12 is controlled to be de-energized, and the directions of the currents flowing through the relatively arranged first transmitting coil groups 11 are opposite.

[0087] Working mode three: the first transmitting coil group 11 in the relatively arranged transmitting coil groups 1 is controlled to be not energized, and the second transmitting coil group 12 is energized, and the direction of the current flowing through the relatively arranged second transmitting coil group 12 is opposite.

[0088] Specifically, for working mode 1, please refer to the above Figure 2 , Figure 3 ,exist Figure 3 In this mode, the current directions of the first transmitting coil groups 11 on the door panels on both sides are the same, both counterclockwise, forming a superposition field. At this time, in this mode, the magnetic fields of the door panels on both sides are superimposed on each other, mainly generating X-component magnetic field lines uniformly distributed in the detection channel. Figure 6 for Figure 2 The schematic diagram of the magnetic flux lines in the X-axis direction of the coil structure in the working mode is shown as follows: Figure 6 As shown, in the working mode, there is no blind area in the magnetic flux lines in the X-axis direction.

[0089] For working mode 2, please refer to the above Figure 2 , Figure 4 ,exist Figure 4 In this mode, the first transmitting coil group 11 on the first door panel 10 is counterclockwise, and the first transmitting coil group 11 on the second door panel 20 is clockwise, and the first transmitting coil groups 11 on the door panels on both sides form a repulsive field. At this time, in this mode, the current directions of the vertical conducting wires (such as conducting wire g) on ​​the same column on each door panel are the same, and there is no situation where the current directions of the conducting wires in the same column are opposite. Figure 7 for Figure 2 The schematic diagram of the magnetic flux lines in the Y-axis direction of the coil structure shown in the second working mode is as follows Figure 7 As shown, there is no blind area in the magnetic flux lines in the Y-axis direction.

[0090] In addition, the first transmitting coil group 11 also generates magnetic flux lines in the Z-axis direction. Since the current directions of the two horizontal conducting wires a and b of the first sub-coil 114 are opposite, a blind area of ​​magnetic flux lines in the Z-axis direction is formed in the middle position of the door panels on both sides, namely, the Z-axis blind area A. Figure 8 As shown, Figure 8 for Figure 2The schematic diagram of the magnetic flux lines in the Z-axis direction of the coil structure shown in the second working mode.

[0091] For working mode 3, please refer to the above Figure 2 , Figure 5 ,like Figure 5 As shown, the current directions of the second transmitting coil groups 12 on the two door panels are opposite, that is, the current directions of the sub-coil group 121 on the upper part of the first door panel 10 and the sub-coil group 121 on the upper part of the second door panel 20 are opposite, and the current directions of the sub-coil group 121 on the lower part of the first door panel 10 and the sub-coil group 121 on the lower part of the second door panel 20 are opposite. Figure 5 It can be seen that the current direction of the current line d of the second sub-coil 1211 is opposite to that of the current line c of the second sub-coil 1212. Therefore, there is a blind area of ​​magnetic flux lines in the Z-axis direction between the current lines c and d, namely, the Z-axis blind area B. Similarly, there is also a blind area of ​​magnetic flux lines in the Z-axis direction between the current lines e and f, namely, the Z-axis blind area C. Fig. 9 As shown, Fig. 9 for Figure 2 The schematic diagram of the magnetic flux lines in the Z-axis direction of the coil structure shown in working mode three.

[0092] In the solution provided in the embodiment of the present application, the above three working modes are executed alternately, which has the advantages of:

[0093] For the magnetic flux lines in the X-axis direction, working mode one can generate magnetic flux lines in the X-axis direction without blind spots. For the magnetic flux lines in the Y-axis direction, working mode two can generate magnetic flux lines in the Y-axis direction without blind spots. For the magnetic flux lines in the Z-axis direction, although in working mode three, the second transmitting coil group 12 will form two blind spots located at the upper and lower parts of the magnetic flux lines in the Z-axis direction, and in working mode two, the first transmitting coil group 11 will generate a blind spot located in the middle, but because the blind spot positions of working modes two and three are different, by alternating the execution of these three working modes, substantially all areas in the Z-axis direction can also be detected, which is equivalent to having no blind spots in the Z-axis direction. Therefore, the solution provided in the embodiment of the present application can realize the detection of no blind spots in the X-axis, Y-axis, and Z-axis directions when passers-by pass through the detection channel.

[0094] A coil structure is described above. In this embodiment, the coil structure mentioned above can be applied to a pass-through detector. The pass-through detector includes:

[0095] The door panel structure includes a first door panel 10 , a second door panel 20 and a top panel 30 .

[0096] As the coil structure mentioned above, the coil structure includes two sets of transmitting coil groups that are arranged opposite to each other, one set of transmitting coil groups 1 is arranged in the first door panel 10 , and the other set of transmitting coil groups 1 is arranged in the second door panel 20 .

[0097] One set of transmitting coil groups 1 is arranged on the first door panel 10, and another set of transmitting coil groups 1 is arranged on the second door panel 20. A detection channel (not shown in the drawings) is formed between the first door panel 10, the second door panel 20 and the top panel 30.

[0098] 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.

[0099] 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 claims of the present application.

[0100] 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: It includes a transmitting coil group, which can be arranged on a side door panel of a pass-through detection device; the transmitting coil group includes a first transmitting coil group and a second transmitting coil group; the first transmitting coil group and the second transmitting coil group are placed overlappingly; The position of the blind area of ​​the magnetic flux lines of the first transmitting coil group in the Z-axis direction is different from the position of the blind area of ​​the magnetic flux lines of the second transmitting coil group in the Z-axis direction, and at least one blind area of ​​the magnetic flux lines in the Z-axis direction is opposite to the intersection area of ​​the first transmitting coil group and the second transmitting coil group.

2. The coil structure according to claim 1, characterized in that: The first transmitting coil group and the second transmitting coil group both include a first conducting line along the Y-axis direction; and a projection of a region between two adjacent first conducting lines with opposite current directions in the first transmitting coil group on a plane formed by the Y-axis and the Z-axis does not intersect or partially intersects with a projection of a region between two adjacent first conducting lines with opposite current directions in the second transmitting coil group on a plane formed by the Y-axis and the Z-axis.

3. The coil structure according to claim 2, characterized in that: The first transmitting coil group includes a plurality of first sub-coils, each of the first sub-coils includes a first conducting wire and a second conducting wire extending along the Z-axis direction, and the first conducting wire is connected to the second conducting wire; the projections of the first sub-coils on the plane formed by the Y-axis and the Z-axis are arranged in a circle, and the directions of the currents flowing through the first sub-coils are the same; The second transmitting coil group includes a plurality of sub-coil groups, each of which is arranged in sequence along the Z axis, and two adjacent sub-coil groups are arranged at intervals or overlapped, and the directions of currents of adjacent sub-coil groups are opposite.

4. The coil structure according to claim 3, characterized in that: Each of the sub-coil groups includes a plurality of second sub-coils whose projections on the plane formed by the Y-axis and the Z-axis intersect, and the current directions of the second sub-coils are the same; the second sub-coil includes the first conducting wire and a second conducting wire along the Z-axis direction; the first conducting wire and the second conducting wire are connected.

5. The coil structure according to claim 4, characterized in that: A projection of an area between two adjacent first conducting lines with the same current flow direction in two adjacent or intersecting second sub-coils on a plane formed by the Y axis and the Z axis intersects with a projection of an area between two adjacent first conducting lines with opposite current directions in the first transmitting coil group on a plane formed by the Y axis and the Z axis.

6. The coil structure according to claim 4, characterized in that: The projection of the area between two adjacent first conducting lines with the same current flow direction in two adjacent or intersecting second sub-coils on the plane formed by the Y axis and the Z axis covers the projection of the area between two adjacent first conducting lines with opposite current directions in the first transmitting coil group on the plane formed by the Y axis and the Z axis.

7. The coil structure according to claim 3, characterized in that: A projection of a region between two adjacent first conducting wires in the first transmitting coil group with the same current flow direction on a plane formed by the Y axis and the Z axis intersects with a projection of a region between two adjacent first conducting wires in the second transmitting coil group with opposite current flow directions on a plane formed by the Y axis and the Z axis.

8. The coil structure according to claim 3, characterized in that: A projection of an area between two adjacent first conducting lines with the same current flow direction in the first transmitting coil group on a plane formed by the Y axis and the Z axis covers a projection of an area between two adjacent first conducting lines with opposite current flow directions in the second transmitting coil group on a plane formed by the Y axis and the Z axis.

9. The coil structure according to any one of claims 1 to 8, characterized in that: The coil structure includes two groups of transmitting coil groups arranged opposite to each other, and the direction of the current flowing through the first transmitting coil group in the transmitting coil groups arranged opposite to each other is switched between the same direction and the opposite direction, and the direction of the current flowing through the second transmitting coil group in the transmitting coil groups arranged opposite to each other.

10. The coil structure according to any one of claims 1 to 8, characterized in that: The first transmitting coil group is formed by winding a first conductive wire, and the second transmitting coil group is formed by winding a second conductive wire, and the first conductive wire and the second conductive wire are connected to the same power interface.

11. 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 10, wherein: The coil structure includes two groups of transmitting coil groups arranged opposite to each other, one group of the transmitting coil groups is arranged in the first door panel, and the other group of the transmitting coil groups is arranged in the second door panel.

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