Electromagnetic detection apparatus, method and device

Abstract

The electromagnetic detection device, method and equipment provided by the embodiments of the present disclosure include a transmitting module, a receiving module, a position adjusting module and a number of turns adjusting module. The transmitting module includes an inner-outer nested transmitting coil, which includes an inner transmitting coil and an outer transmitting coil, and has the same winding direction to form a specific magnetic field region. The receiving module includes a receiving coil, which receives a secondary field signal generated by a target to be detected when the magnetic flux in the specific magnetic field region is not zero and is adjusted to zero by a region magnetic flux adjusting module. The region magnetic flux adjusting module includes at least one of the following: the position adjusting module is located on the transmitting module and is provided with a sliding assembly, the receiving module is located on the sliding assembly, and the sliding assembly slides along a direction perpendicular to the plane of the transmitting module; the number of turns adjusting module is located on the transmitting module and is provided with a number of turns adjusting assembly, which adjusts the number of turns of a working coil in the inner transmitting coil by connecting different positions of the inner transmitting coil.

Description

Technical Field

[0001] This disclosure relates to the field of electromagnetic detection technology, and in particular to an electromagnetic detection device, method and apparatus. Background Technology

[0002] Electromagnetic method is a geophysical exploration technique based on the principle of electromagnetic induction. Its basic working principle is as follows: First, a transmitting coil emits a pulsed current, which generates a pulsed magnetic field in space, i.e., the primary field. When the primary field propagates in space and encounters a low-resistivity body, it generates eddy currents, i.e., induced currents. The induced currents generate a magnetic field in space that decays over time, i.e., the secondary field. Then, a receiving coil receives the secondary field signal and infers the physical properties and spatial location of the underground electrical medium based on the secondary field signal, so as to realize the detection of the underground electrical medium.

[0003] However, when using electromagnetic methods for the aforementioned detection, the receiving coil will simultaneously receive both the primary and secondary fields. Since the amplitude of the primary field signal is much larger than that of the secondary field signal, the secondary field signal will be submerged within the primary field signal, leading to a decrease in detection accuracy and shallow-layer detection capability. Currently used electromagnetic detection devices based on overlapping loop devices, center loop devices, or dipole devices have not solved this problem, resulting in primary and secondary field aliasing when using these devices. This renders the data received earlier by the receiving coil unusable, resulting in insufficient shallow-layer detection capability. Summary of the Invention

[0004] This disclosure provides an electromagnetic detection device, method, and apparatus to address the problem in related technologies where primary and secondary fields overlap during electromagnetic detection, rendering early data received by the receiving coil unusable and resulting in insufficient detection capability for shallow layers.

[0005] In a first aspect, embodiments of this disclosure provide an electromagnetic detection device, the device comprising:

[0006] Transmitting module, receiving module, position adjustment module, and turns adjustment module;

[0007] The transmitting module includes inner and outer nested transmitting coils, which include an inner transmitting coil and an outer transmitting coil. The inner transmitting coil and the outer transmitting coil are wound in the same direction, and are used to generate primary fields in opposite directions in the region between the inner transmitting coil and the outer transmitting coil when the same pulse current passes through, thus forming a specific magnetic field region.

[0008] The receiving module includes a receiving coil, the projection of which onto the plane of the transmitting module lies entirely within the specific magnetic field region. When the magnetic flux in the specific magnetic field region is not zero, and is adjusted to zero by the region magnetic flux adjustment module, the receiving module receives the secondary field signal generated by the target to be detected, thereby obtaining a specified physical property of the target based on the secondary field signal. The region magnetic flux adjustment module includes at least one of the following:

[0009] The position adjustment module is located on the transmitting module and is provided with a sliding component. The receiving module is located on the sliding component. The sliding component slides along a direction perpendicular to the plane of the transmitting module to adjust the position of the receiving module relative to the transmitting module. The position adjustment module is used to adjust the magnetic flux of the specific magnetic field region to zero by adjusting the position of the receiving module relative to the transmitting module.

[0010] The turns adjustment module is located on the transmitting module and is equipped with a turns adjustment component. The turns adjustment component is used to adjust the number of turns of the working coil in the inner transmitting coil by connecting to different positions of the inner transmitting coil. The working coil is a coil that participates in the current loop when the transmitting module transmits current. The turns adjustment module is used to adjust the magnetic flux of the specific magnetic field region to zero by adjusting the number of turns of the working coil in the inner transmitting coil.

[0011] In a second aspect, embodiments of this disclosure provide an electromagnetic detection method applied to the apparatus described in the first aspect above, the method comprising:

[0012] The magnetic flux in the specific magnetic field region is detected to be zero, and the detection result is obtained.

[0013] If the detection result is negative, the region magnetic flux adjustment module performs a region magnetic flux adjustment operation to adjust the magnetic flux of the specific magnetic field region to zero; the region magnetic flux adjustment operation includes at least one of the following: sliding the sliding component on the position adjustment module; adjusting the position of the turns adjustment component of the turns adjustment module and the inner transmitting coil.

[0014] Based on the secondary field signal generated by the target being detected received by the receiving module in the specific magnetic field region where the magnetic flux is zero, the specified physical properties of the target being detected are obtained.

[0015] Thirdly, embodiments of this disclosure provide an electromagnetic detection device, including: a processor; and a memory configured to store computer-executable instructions, which, when executed, cause the processor to perform the steps of the method described in the second aspect above.

[0016] Fourthly, embodiments of this disclosure provide a computer-readable storage medium for storing computer-executable instructions that, when executed by a processor, implement the steps of the method described in the second aspect above.

[0017] Fifthly, embodiments of this disclosure provide a computer program product, the computer program product including a computer program, which, when executed by a processor, implements the steps of the method described in the second aspect above.

[0018] The at least one technical solution provided by the embodiments of the present invention can achieve the following technical effects:

[0019] In this embodiment of the invention, the electromagnetic detection device may include a transmitting module, a receiving module, a position adjustment module, and a turns adjustment module. The transmitting module includes inner and outer nested transmitting coils, which are an inner transmitting coil and an outer transmitting coil, and the inner and outer transmitting coils have the same winding direction. The receiving module includes a receiving coil, and the projection of the receiving coil onto the plane of the transmitting module is completely located in a specific magnetic field region. The position adjustment module is located on the transmitting module and is provided with a sliding component, and the receiving module is located on the sliding component. The turns adjustment module is located on the transmitting module and is provided with a turns adjustment component.

[0020] When performing electromagnetic detection on a target, a pulsed current can be emitted to the transmitting module. When this pulsed current passes through, the inner and outer transmitting coils generate primary fields in opposite directions in the region between them, forming a specific magnetic field region. Then, the receiving module can receive the secondary field signal generated by the target, provided that the magnetic flux in the specific magnetic field region is not zero and has been adjusted to zero by the region magnetic flux adjustment module. This allows for the detection of the target's specified physical properties based on the secondary field signal. The region magnetic flux adjustment module includes at least one of a position adjustment module and a turns adjustment module. The sliding component of the position adjustment module slides along a direction perpendicular to the plane of the transmitting module to adjust the position of the receiving module relative to the transmitting module. The position adjustment module is used to adjust the magnetic flux in the specific magnetic field region to zero by adjusting the position of the receiving module relative to the transmitting module. The turns adjustment module's turns adjustment component is used to adjust the number of turns of the working coil in the inner transmitting coil by connecting different positions of the inner transmitting coil. The working coil is the coil that participates in the current loop when the transmitting module emits current. The turns adjustment module is used to adjust the magnetic flux in the specific magnetic field region to zero by adjusting the number of turns of the working coil in the inner transmitting coil.

[0021] The electromagnetic detection device in this embodiment of the invention can generate primary fields in opposite directions in a specific area through nested inner and outer transmitting coils, forming a specific magnetic field region with near-zero magnetic flux. By using a position adjustment module and a turns adjustment module to perform coordinated optimization based on the relative position of the receiving module and the transmitting module, as well as the number of turns of the working coil of the inner transmitting coil, the specific magnetic field region is precisely adjusted to a magnetic field region with zero magnetic flux, thereby completely eliminating primary field interference. This allows the receiving coil to capture only the secondary field signal generated by the target to be detected, solving the problem of early data failure caused by the aliasing of primary and secondary fields in traditional electromagnetic detection. This significantly improves the sensitivity and data availability of shallow target detection, achieving a high-precision and anti-interference electromagnetic detection effect. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in one or more embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is one of the structural schematic diagrams of an electromagnetic detection device provided in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of a transmitting module provided in one embodiment of the present invention;

[0025] Figure 3 This is a second schematic diagram of the structure of an electromagnetic detection device provided in one embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of a receiving module provided in one embodiment of the present invention;

[0027] Figure 5 This is one of the structural schematic diagrams of a position adjustment module provided in an embodiment of the present invention;

[0028] Figure 6 This is a second schematic diagram of the structure of a position adjustment module provided in one embodiment of the present invention;

[0029] Figure 7 This is one of the structural schematic diagrams of a turns adjustment module provided in an embodiment of the present invention;

[0030] Figure 8 This is a second schematic diagram of the structure of a turns adjustment module provided in one embodiment of the present invention;

[0031] Figure 9This is the third schematic diagram of the structure of a turns adjustment module provided in one embodiment of the present invention;

[0032] Figure 10 This is the fourth schematic diagram of the structure of a turns adjustment module provided in one embodiment of the present invention;

[0033] Figure 11 This is a flowchart illustrating an electromagnetic detection method provided in one embodiment of the present invention.

[0034] Figure 12 This is a schematic diagram of the primary field voltage response result in the receiving module of the electromagnetic detection method provided in one embodiment of the present invention;

[0035] Figure 13 This is a schematic diagram of the structure of an electromagnetic detection device provided in one embodiment of the present invention.

[0036] In the diagram: 1. Transmitter module; 2. Receiver module; 3. Position adjustment module; 4. Turns adjustment module; 5. Inner transmitting coil; 6. Outer transmitting coil; 7. Transmitter coil frame; 8. Guide rail; 9. Receiver coil; 10. Receiver coil frame; 11. Adjusting rod; 12. Sliding platform; 13. Ball screw; 14. Knob; 15. Guide rod; 16. Slide rail; 17. Set screw; 18. Transmitter signal input terminal; 19. Receiver module wiring terminal; 20. Sliding plate; 21. Adjustable wire; 22. Insulation layer; 23. Wire and cable; 24. Clip; 25. Insulation block. Detailed Implementation

[0037] To enable those skilled in the art to better understand the technical solutions in one or more embodiments of this disclosure, and to make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0038] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0039] Please see Figure 1 , Figure 1 This is one of the structural schematic diagrams of an electromagnetic detection device provided in an embodiment of the present invention, such as... Figure 1 As shown, the device includes a transmitting module 1, a receiving module 2, a position adjustment module 3, and a turns adjustment module 4. The number of receiving modules 2, 3, and 4 can be one or more. Figure 1The diagram shows the case where there are 2 receiving modules, 2 position adjustment modules, and 1 turn adjustment module. Figure 1 The situation shown is only an example. The embodiments of the present invention do not limit the number of receiving module 2, position adjustment module 3, and number of turns adjustment module 4.

[0040] In one embodiment of the invention, the transmitting module 1 may include nested transmitting coils, the nested transmitting coils including an inner transmitting coil 5 and an outer transmitting coil 6 (e.g., ...). Figure 2 As shown), the inner emitting coil 5 and the outer emitting coil 6 are wound in the same direction to generate primary fields in opposite directions in the region between the inner emitting coil 5 and the outer emitting coil 6 when the same pulse current passes through, thus forming a specific magnetic field region. Figure 3 As shown, this can be achieved in the region between the inner transmitting coil 5 and the outer transmitting coil 6, i.e. Figure 3 The area marked as Region II forms a specific magnetic field region.

[0041] The magnetic flux in a specific magnetic field region may be zero or non-zero, and the embodiments of the present invention do not impose any restrictions on this. In one example, the magnetic fields generated by the inner transmitting coil 5 and the outer transmitting coil 6 completely cancel each other out in the region between the inner transmitting coil 5 and the outer transmitting coil 6, then the magnetic flux in the specific magnetic field region is 0; in another example, the magnetic fields generated by the inner transmitting coil 5 and the outer transmitting coil 6 do not completely cancel each other out in the region between the inner transmitting coil 5 and the outer transmitting coil 6, then the magnetic flux in the specific magnetic field region is not 0.

[0042] like Figure 2 As shown, the transmitting module 1 may further include a transmitting coil frame 7. The aforementioned nested transmitting coils are formed by winding wires around the transmitting coil frame 7.

[0043] In one example, the wires on transmitting coils 5 and 6 can be wound counterclockwise around the transmitting coil frame 7. When the pulse current passes through transmitting coils 5 and 6, a primary field is generated. The primary fields generated by the transmitting module 1 in the region between the inner and outer transmitting coils 5 and 6 are opposite in direction and cancel each other out, forming a specific magnetic field region.

[0044] like Figure 2 As shown, the transmitting module 1 may include an inner transmitting coil 5, an outer transmitting coil 6, a transmitting coil frame 7, and a guide rail 8. The guide rail 8 can be glued to the frame of the transmitting module 1 so as to be connected to the position adjustment module 3.

[0045] In one embodiment of the present invention, the receiving module 2 includes a receiving coil 9, such as... Figure 4As shown, the projection of the receiving coil 9 onto the plane of the transmitting module 1 lies entirely within a specific magnetic field region. The receiving module 1 may also include a receiving coil frame 10.

[0046] In this embodiment of the invention, the shapes of the transmitting coils 5 and 6 and the receiving coil 9 can be circular, triangular, pentagonal, etc., and this embodiment of the invention does not impose any limitation on them. Furthermore, the shapes of the transmitting coils 5 and 6 and the receiving coil 9 can be the same or different; the number of transmitting coils 5 and 6 and the receiving coil 9 can also be one or more, and this embodiment of the invention also does not impose any limitation on them. Furthermore, the number of transmitting coils 5 and 6 and the receiving coil 9 can be the same or different.

[0047] like Figure 4 As shown, the receiving module 2 may include a receiving coil 9, a receiving coil frame 10, and an adjusting rod 11, wherein the adjusting rod 11 is used to adjust the accuracy of the signal received by the receiving module 2.

[0048] If the magnetic flux in a specific magnetic field region is zero, the receiving module 2 can receive the secondary field signal generated by the target under the triggering of the primary field, and obtain the specified physical properties of the target based on the secondary field signal. The specified physical properties may include the physical location of the target and its physical characteristics, such as size and shape.

[0049] If the magnetic flux in a specific magnetic field region is not zero, the magnetic flux in the specific magnetic field region can be adjusted to zero by the region magnetic flux adjustment module. Then, the secondary field signal generated by the target to be detected is received in the specific magnetic field region where the magnetic flux is zero, so as to obtain the specified physical properties of the target to be detected based on the secondary field signal.

[0050] Among them, such as Figure 1 As shown, the regional magnetic flux adjustment module may include at least one of a position adjustment module 3 and a turns adjustment module 4. Specifically, the position adjustment module 3 can be used to adjust the position of the receiving module 2 relative to the transmitting module 1, and to coarsely adjust the cancellation of the primary fields generated by the inner and outer transmitting coils 5 and 6; while the turns adjustment module 4 can change the effective number of turns of the inner transmitting coil 5 participating in the current loop, and to finely adjust the cancellation of the primary fields generated by the inner and outer transmitting coils 5 and 6.

[0051] In one embodiment of the invention, the position adjustment module 3 may be located on the transmitting module 1 and is provided with a sliding component 12, such as... Figure 5As shown, the receiving module 2 is located on the sliding component 12. The sliding component 12 can be a sliding platform, which can slide along a direction perpendicular to the plane of the transmitting module 1 to adjust the position of the receiving module 2 relative to the transmitting module 1. The position adjustment module 3 is used to adjust the magnetic flux of a specific magnetic field region to zero by adjusting the position of the receiving module 2 relative to the transmitting module 1.

[0052] In one example, such as Figure 5 As shown, the position adjustment module 3 may further include: a knob 14, a ball screw 13, a guide rod 15, and a slide rail 16. The knob 14 is connected to the ball screw 13 and rotates when rotated. The sliding assembly 12 is mounted on the slide rail 16 via the ball screw 13 and the guide rod 15. The slide rail 16 slides on the guide rail 8 of the transmitting module 1. When the ball screw 13 is rotated, it causes the sliding assembly 12 to slide along the guide rod 15. During sliding, it can slide in a direction perpendicular to the transmitting module 1 to quickly change the position of the receiving module 2 relative to the transmitting module 1. To reduce the influence on the magnetic field, the components of the position adjustment module 3, such as the ball screw 13 and the guide rod 15, are all made of non-ferromagnetic materials.

[0053] Specifically, the receiving coil 9 is installed on the sliding platform of the position adjustment module 3 and fixed on the sliding platform 12 by a cover plate. The sliding platform 12 is installed on the slide rail 16 by a ball screw 13 and two guide rods 15. The slide rail 16 slides on the guide rail 8 of the transmitting module 1, and the guide rail 8 can be connected to the frame of the transmitting module 1 by adhesive.

[0054] By rotating the knob 14 of the position adjustment module 3, the ball screw 13 connected to the knob 14 can be rotated. When the ball screw 13 rotates, it drives the sliding platform 12 to move along the guide rod 15, thereby moving the sliding platform 12 and thus allowing the position adjustment module 4 to adjust the position of the receiving module 2 relative to the transmitting module 1.

[0055] like Figure 6 As shown, knob 14 is interference-fitted with ball screw 13 and locked by set screw 17. Sliding platform 12 is fitted with ball screw 13 through threaded hole.

[0056] In one embodiment of the present invention, the turns adjustment module 4 may be located on the transmitting module 1 and is provided with a turns adjustment component. The turns adjustment component can be used to adjust the number of turns of the working coil in the inner transmitting coil 5 by connecting different positions of the inner transmitting coil 5, wherein the working coil is the coil that participates in the current loop when the transmitting module 1 transmits current. The turns adjustment module 4 can be used to adjust the magnetic flux of a specific magnetic field region to zero by adjusting the number of turns of the working coil in the inner transmitting coil 5.

[0057] In one example, such as Figure 7 As shown, the turns adjustment module may include a transmitter signal input terminal 18, wherein the transmitter corresponding to the transmitter signal input terminal 18 is used to transmit pulse current to the transmitting module 1. The turns adjustment module may also include a receiving module terminal 19. The inner transmitting coil 5 may be an insulated wire, in which case the outer insulating layer of the inner transmitting coil 5 may have an opening, and the turns adjustment component may be a slider 20, which can be connected to the inner transmitting coil 5 through the provided opening to form a current loop.

[0058] In this example, the slider 20 can move along the inner transmitting coil 5 and connect with openings at different positions of the inner transmitting coil 5 during the movement to adjust the number of turns of the working coil in the inner transmitting coil 5, so as to adjust the magnetic flux of a specific magnetic field region to zero by adjusting the number of turns of the working coil in the inner transmitting coil 5.

[0059] like Figure 7 As shown, the slider 20 of the turns adjustment module 4 can move along the adjustable wire 21, thereby changing the number of turns of the working coil of the inner transmitting coil 5 and changing the ratio of the number of turns of the inner and outer transmitting coils in the current loop. In this example, the signal input terminal of the turns adjustment module 4 can be connected to the transmitter 18 and the turns adjustment component, i.e., the slider 20 in this example, respectively.

[0060] like Figure 8 As shown, the outer insulation layer 22 of the adjustable wire 21 of the turns adjustment module 4 has a small opening, so that the probe on the slider 20 is in close contact with the wire and cable 23 inside the wire insulation layer 22 of the inner transmitting coil 5.

[0061] like Figure 8 As shown, the top and bottom of the turns adjustment module 4 are provided with grooves that can cooperate with the guide rail 8 on the inner transmitting coil frame 7.

[0062] In another example, such as Figure 9 and Figure 10 As shown, a movable insulating block 25 may be provided on the wire of the inner transmitting coil 5. In this case, the turns adjustment component can be a snap-fit ​​24. At this time, the wire of the inner transmitting coil 5 does not have an outer insulating layer.

[0063] In this example, the latch 24 can adjust the number of turns of the working coil in the inner transmitting coil 5 by connecting the area between the movable insulating blocks 25 and the wires 23 at different positions of the inner transmitting coil 5 during the movement of the movable insulating blocks 25. This adjustment allows the magnetic flux in a specific magnetic field region to be adjusted to zero.

[0064] The adjustable wire 21 of the turns adjustment module 4 is equipped with many insulating blocks 25. The clips 24 can be fastened to the wire cable 23. The number of turns of the working coil of the inner transmitting coil 5 can be adjusted by moving the position of the insulating blocks 25 to free up the position of the clips 24.

[0065] In embodiments of the present invention, the regional magnetic flux adjustment module may include a position adjustment module 3, may include a turns adjustment module 4, or may include both a position adjustment module 3 and a turns adjustment module 4. The present invention does not limit this; in addition, the present invention does not limit the number of regional magnetic flux adjustment modules.

[0066] In one example, the regional magnetic flux adjustment module can simultaneously include a position adjustment module 3 and a turns adjustment module 4, for example, as follows: Figure 1 As shown, two position adjustment modules 3 and one turns adjustment module 4 can be set. In a specific magnetic field region, namely the region between the inner transmitting coil 5 and the outer transmitting coil 6, when the magnetic flux is not zero, the magnetic flux of the specific magnetic field can be adjusted to zero by setting the two position adjustment modules 3 and the turns adjustment module 4.

[0067] In this adjustment process, the position adjustment module 3 directly alters the relative spatial relationship between the receiving coil and the transmitting source through physical displacement, using a wide-range adjustment to quickly cancel out the main interference components of the primary field, thus achieving magnetic flux adjustment in a specific magnetic field region. Therefore, using the position adjustment module 3 allows for rapid, coarse adjustment with high efficiency, but limited precision. The turns adjustment module 4, on the other hand, uses real-time feedback closed-loop control to compensate for residual errors after coarse adjustment with micro-currents, achieving magnetic flux adjustment in a specific magnetic field region. Therefore, using the turns adjustment module 4 provides high precision, but limited efficiency. Therefore, when combining the position adjustment module 3 and the turns adjustment module 4 to adjust the magnetic flux in a specific magnetic field region, the position adjustment module 3 can be used first for coarse adjustment, followed by the turns adjustment module 4 for fine adjustment. This approach ensures both speed and efficiency while maintaining accuracy.

[0068] Specifically, in this example, the knob 14 in the position adjustment module 3 can be rotated first. The knob 14 is connected to the ball screw 13. When the knob 14 is rotated, it drives the ball screw 13 to rotate. The sliding component 12 is mounted on the slide rail 16 via the ball screw 13 and the guide rod 15. The slide rail 16 slides on the guide rail 8 of the transmitting module 1. When the ball screw 13 is rotated, it drives the sliding component 12 to slide along the guide rod 15. During sliding, it can slide in a direction perpendicular to the transmitting module 1 to quickly change the position of the receiving module 2 relative to the transmitting module 1. After adjusting the magnetic flux in a specific magnetic field region to a preset range close to zero using the position adjustment module 3, it can be further adjusted using the turns adjustment module 4. Specifically, the slider 20 on the turns adjustment module 4 can be slid to connect with small openings at different positions on the outer insulation layer 22 of the adjustable wire 21. Alternatively, the movable insulating block 25 can be adjusted so that the latch 24 is connected to different positions of the wires 23 of the inner transmitting coil 5, thereby adjusting the number of turns of the working coil in the inner transmitting coil 5 to precisely adjust the magnetic flux in the specific magnetic field region. Through the synergistic effect of the position adjustment module 3 and the turns adjustment module 4, the magnetic flux in a specific magnetic field region can be quickly and accurately adjusted to zero. This allows the secondary field signal generated by the target to be detected to be received in the specific magnetic field region where the magnetic flux is zero, so as to obtain the specified physical properties of the target based on the secondary field signal.

[0069] Furthermore, it should be noted that the example shown here, which first uses the position adjustment module 3 for quick and coarse adjustment, and then uses the turns adjustment module 4 for precise adjustment, is a preferred example of this solution. The order of these two adjustment operations is not limited in this embodiment of the invention; that is, one or two position adjustment modules 3 can be used first, followed by the turns adjustment module 4; or the turns adjustment module 4 can be used first, followed by the position adjustment module 3; or both the turns adjustment module 4 and the position adjustment module 3 can be used simultaneously.

[0070] In another example, the regional magnetic flux adjustment module may include the position adjustment module 3 but not the number of turns adjustment module 4. In this case, the magnetic flux of a specific magnetic field region can be adjusted by using the position adjustment module 3. Since the adjustment process has been described in detail in the above embodiments, the embodiments of the present invention do not limit this.

[0071] In another example, the regional magnetic flux adjustment module may include the number of turns adjustment module 4, but not the position adjustment module 3. In this case, the magnetic flux of a specific magnetic field region can be adjusted by using the number of turns adjustment module 4. Since the adjustment process has been described in detail in the above embodiments, the embodiments of the present invention do not limit this.

[0072] The electromagnetic detection device in this embodiment of the invention can be used simultaneously for transient and harmonic detection of the target to be detected.

[0073] In this embodiment of the invention, the electromagnetic detection device may include a transmitting module, a receiving module, a position adjustment module, and a turns adjustment module. The transmitting module includes inner and outer nested transmitting coils, which are an inner transmitting coil and an outer transmitting coil, and the inner and outer transmitting coils have the same winding direction. The receiving module includes a receiving coil, and the projection of the receiving coil onto the plane of the transmitting module is completely located in a specific magnetic field region. The position adjustment module is located on the transmitting module and is provided with a sliding component, and the receiving module is located on the sliding component. The turns adjustment module is located on the transmitting module and is provided with a turns adjustment component.

[0074] When performing electromagnetic detection on a target, a pulsed current can be emitted to the transmitting module. When this pulsed current passes through, the inner and outer transmitting coils generate primary fields in opposite directions in the region between them, forming a specific magnetic field region. Then, the receiving module can receive the secondary field signal generated by the target, provided that the magnetic flux in this specific magnetic field region is not zero and has been adjusted to zero by the region magnetic flux adjustment module. The receiver then uses this secondary field signal to detect the target's specified physical properties. The region magnetic flux adjustment module includes at least one of a position adjustment module and a turns adjustment module. The sliding component of the position adjustment module slides along a direction perpendicular to the plane of the transmitting module to adjust the position of the receiving module relative to the transmitting module. The position adjustment module is used to adjust the magnetic flux of a specific magnetic field region to zero by adjusting the position of the receiving module relative to the transmitting module. The turns adjustment component of the turns adjustment module is used to adjust the number of turns of the working coil in the inner transmitting coil by connecting different positions of the inner transmitting coil. The working coil is the coil that participates in the current loop when the transmitting module transmits current. The turns adjustment module is used to adjust the magnetic flux of a specific magnetic field region to zero by adjusting the number of turns of the working coil in the inner transmitting coil.

[0075] The electromagnetic detection device in this embodiment of the invention can generate primary fields in opposite directions in a specific area through nested inner and outer transmitting coils, forming a specific magnetic field region with near-zero magnetic flux. By using a position adjustment module and a turns adjustment module to perform coordinated optimization based on the relative position of the receiving module and the transmitting module, as well as the number of turns of the working coil of the inner transmitting coil, the specific magnetic field region is precisely adjusted to a magnetic field region with zero magnetic flux, thereby completely eliminating primary field interference. This allows the receiving coil to capture only the secondary field signal generated by the target to be detected, solving the problem of early data failure caused by the aliasing of primary and secondary fields in traditional electromagnetic detection. This significantly improves the sensitivity and data availability of shallow target detection, achieving a high-precision and anti-interference electromagnetic detection effect.

[0076] Corresponding to the above-described electromagnetic detection device, this embodiment of the invention also provides an electromagnetic detection method applied to the above-described electromagnetic detection device. Figure 11 This is a flowchart illustrating an electromagnetic detection method provided in one embodiment of the present invention, as shown below. Figure 11 As shown, the electromagnetic detection method includes:

[0077] Step 1102: Detect whether the magnetic flux in a specific magnetic field region is zero and obtain the detection result.

[0078] Step 1104: If the detection result is negative, perform a regional magnetic flux adjustment operation according to the regional magnetic flux adjustment module to adjust the magnetic flux of a specific magnetic field region to zero; the regional magnetic flux adjustment operation includes at least one of the following: sliding the sliding component on the position adjustment module; adjusting the position of the turns adjustment component of the turns adjustment module and the inner transmitting coil.

[0079] Step 1106: Based on the secondary field signal generated by the target being detected received by the receiving module in a specific magnetic field region where the magnetic flux is zero, obtain the specified physical properties of the target being detected.

[0080] In one embodiment of the present invention, it is possible to detect whether the magnetic flux in a specific magnetic field region described in the above embodiments is zero, and obtain the detection result.

[0081] Specifically, the transmitter can transmit pulsed current to the transmitting module. The inner and outer transmitting coils of the transmitting module can generate primary magnetic fields with opposite directions in the region between the inner and outer transmitting coils, which cancel each other out and form a specific magnetic field region.

[0082] When they cancel each other out, if they completely cancel each other out, the magnetic flux in a specific magnetic field region is zero, that is, the specific magnetic field region is a zero magnetic flux region; if they do not completely cancel each other out, the magnetic flux in a specific magnetic field region is not zero. In this case, when detecting whether the magnetic flux in a specific magnetic field region is zero, the detection result obtained is no.

[0083] If the detection result is negative, a regional magnetic flux adjustment operation can be performed according to the regional magnetic flux adjustment module to make the magnetic flux in a specific magnetic field region zero. The regional magnetic flux adjustment operation can include at least one of the following: sliding the sliding component on the position adjustment module; adjusting the position of the turns adjustment component of the turns adjustment module relative to the inner transmitting coil.

[0084] In one example, the regional magnetic flux adjustment operation can be performed by sliding a sliding component on the position adjustment module. This can be achieved by rotating a knob on the position adjustment module to rotate a ball screw, which in turn moves the sliding component. Under the influence of the guide rail and the transmitting module, the sliding component slides along the guide rod, adjusting the relative position of the receiving module and the transmitting module, thereby adjusting the magnetic flux in a specific magnetic field region to zero. Since the specific details have been described in the previous embodiment, they will not be repeated in this embodiment.

[0085] In another example, the regional magnetic flux adjustment operation can be performed by adjusting the position of the turns adjustment component of the turns adjustment module and the inner transmitting coil. This can be achieved by sliding the slider of the turns adjustment module, changing the contact position between the slider and the opening on the inner transmitting coil. Since the slider can contact the cable within the inner transmitting coil through the opening, the number of turns of the working coil participating in the circuit loop can be controlled by contacting different openings. Furthermore, by changing the number of turns of the working coil of the inner transmitting coil, the ratio of the number of turns of the inner and outer transmitting coils in the current loop can be changed, thereby adjusting the magnetic flux in a specific magnetic field region. The magnetic flux can be adjusted to zero. Alternatively, the position of the latch and the inner transmitting coil can be changed by moving the movable insulating block on the inner transmitting coil wire. Since the inner transmitting coil wire is not insulated at this time, a circuit loop can be formed when the latch contacts the inner transmitting coil wire. The latch connects to the inner transmitting coil through the empty area between the movable insulating blocks. Therefore, by moving the movable insulating block, the number of turns of the working coil of the inner transmitting coil can be changed by connecting the latch to different positions of the inner transmitting coil, thereby changing the ratio of the number of turns of the inner and outer transmitting coils in the current loop, and thus adjusting the magnetic flux of a specific magnetic field region to zero. Since the specific details have been described in detail in the previous embodiment, they will not be repeated in this embodiment.

[0086] After adjusting the magnetic flux of a specific area to zero through the regional magnetic flux adjustment operation, the specified physical properties of the target can be obtained from the secondary field signal generated by the target and received by the receiving module in the specific magnetic field area where the magnetic flux is zero.

[0087] When the magnetic field region is a zero flux region, the receiving module can receive the secondary field signal generated by the target to be detected. Since the primary field signal has been completely cleared, the received secondary field signal can be used to determine the specified physical properties of the target to be detected, such as position, size, and shape, more accurately.

[0088] In one example, the regional magnetic flux adjustment operation can simultaneously include sliding the sliding component on the position adjustment module and adjusting the position of the turns adjustment component and the inner transmitting coil of the turns adjustment module. The magnetic flux of a specific magnetic field region can then be adjusted through the combined effect of these two regional magnetic flux adjustment operations.

[0089] Considering that sliding the sliding component on the position adjustment module can directly change the relative spatial relationship between the receiving coil and the transmitting source through physical displacement, and quickly cancel the main interference components of the primary field by using a large-range adjustment to achieve magnetic flux adjustment in a specific magnetic field region, this operation can quickly and coarsely adjust the magnetic flux in a specific magnetic field region with high efficiency, but limited accuracy. On the other hand, adjusting the position of the turns adjustment component and the inner transmitting coil of the turns adjustment module can be based on real-time feedback closed-loop control, using micro-current compensation for the remaining error after coarse adjustment to achieve magnetic flux adjustment in a specific magnetic field region. Therefore, this operation offers high precision, but limited efficiency. Therefore, when using these two operations for coordinated adjustment, the sliding component on the position adjustment module can be used first for coarse adjustment, followed by the operation of adjusting the position of the turns adjustment component and the inner transmitting coil of the turns adjustment module for fine adjustment. This ensures both adjustment speed and efficiency while maintaining accuracy. Since the process of adjusting a specific magnetic field region using these two operations has been detailed in the above embodiments, it will not be repeated here.

[0090] like Figure 12 The diagram shown illustrates the combined use of the two regional magnetic flux adjustment operations described above. It shows the voltage response of the primary field within the receiving module after the transmitter supplies a pulse current to the transmitting module. It can be seen that after rapid, coarse position adjustment (i.e., Figure 12 After coarse adjustment, the primary field in the receiving coil is basically eliminated, while after fine adjustment of the number of turns (i.e., ... Figure 12 After fine-tuning, the primary field inside the receiving coil is completely eliminated.

[0091] Of course, in another example, the regional magnetic flux adjustment operation may include sliding the sliding component on the position adjustment module, but not adjusting the position of the turns adjustment component of the turns adjustment module and the inner transmitting coil; or it may include adjusting the position of the turns adjustment component of the turns adjustment module and the inner transmitting coil, but not sliding the sliding component on the position adjustment module. This embodiment of the invention does not impose any limitations on this.

[0092] In this embodiment of the invention, it is possible to first detect whether the magnetic flux in a specific magnetic field region is zero, obtain the detection result, and if the detection result is negative, perform a region magnetic flux adjustment operation according to the region magnetic flux adjustment module to adjust the magnetic flux in the specific magnetic field region to zero; the region magnetic flux adjustment operation includes at least one of the following: sliding the sliding component on the position adjustment module; adjusting the position of the turns adjustment component of the turns adjustment module and the inner transmitting coil; and then, based on the secondary field signal generated by the target to be detected received by the receiving module in the specific magnetic field region where the magnetic flux is zero, obtain the specified physical properties of the target to be detected.

[0093] This invention utilizes nested transmitting coils to generate primary fields in opposite directions within a specific region, forming a specific magnetic field region with near-zero magnetic flux. By employing position adjustment and turns adjustment modules to collaboratively optimize the relative positions of the receiving and transmitting modules, as well as the number of turns in the working coil of the inner transmitting coil, the specific magnetic field region is precisely adjusted to a region with zero magnetic flux. This completely eliminates primary field interference, allowing the receiving coil to capture only the secondary field signal generated by the target being detected. This solves the problem of early data failure caused by the aliasing of primary and secondary fields in traditional electromagnetic detection, significantly improving the sensitivity and data availability of shallow target detection, and achieving high-precision, interference-resistant electromagnetic detection.

[0094] Corresponding to the above electromagnetic detection method, this embodiment of the invention also provides an electromagnetic detection device. Figure 13 This is a schematic diagram of the hardware structure of an electromagnetic detection device provided in one embodiment of the present invention.

[0095] The electromagnetic detection device can be the terminal device or server for electromagnetic detection provided in the above embodiments.

[0096] Electromagnetic detection devices can vary significantly due to differences in configuration and performance. They may include one or more processors 1301 and memories 1302, with the memory 1302 storing one or more application programs or data. The memory 1302 can be temporary or persistent storage. The application programs stored in the memory 1302 may include one or more modules (not shown), each module including a series of computer-executable instructions for the electromagnetic detection device. Furthermore, the processor 1301 may be configured to communicate with the memory 1302, executing the series of computer-executable instructions stored in the memory 1302 on the electromagnetic detection device. The electromagnetic detection device may also include one or more power supplies 1303, one or more wired or wireless network interfaces 1304, one or more input / output interfaces 1305, and one or more keyboards 1306.

[0097] Specifically, in this embodiment, the electromagnetic detection device includes a memory and one or more programs, wherein one or more programs are stored in the memory, and one or more programs may include one or more modules, and each module may include a series of computer-executable instructions for the electromagnetic detection device, and is configured to be executed by one or more processors in the above embodiment.

[0098] In this embodiment of the invention, it is possible to first detect whether the magnetic flux in a specific magnetic field region is zero, obtain the detection result, and if the detection result is negative, perform a region magnetic flux adjustment operation according to the region magnetic flux adjustment module to adjust the magnetic flux in the specific magnetic field region to zero; the region magnetic flux adjustment operation includes at least one of the following: sliding the sliding component on the position adjustment module; adjusting the position of the turns adjustment component of the turns adjustment module and the inner transmitting coil; and then, based on the secondary field signal generated by the target to be detected received by the receiving module in the specific magnetic field region where the magnetic flux is zero, obtain the specified physical properties of the target to be detected.

[0099] This invention utilizes nested transmitting coils to generate primary fields in opposite directions within a specific region, forming a specific magnetic field region with near-zero magnetic flux. By employing position adjustment and turns adjustment modules to collaboratively optimize the relative positions of the receiving and transmitting modules, as well as the number of turns in the working coil of the inner transmitting coil, the specific magnetic field region is precisely adjusted to a region with zero magnetic flux. This completely eliminates primary field interference, allowing the receiving coil to capture only the secondary field signal generated by the target being detected. This solves the problem of early data failure caused by the aliasing of primary and secondary fields in traditional electromagnetic detection, significantly improving the sensitivity and data availability of shallow target detection, and achieving high-precision, interference-resistant electromagnetic detection.

[0100] Another embodiment of this disclosure also provides a computer-readable storage medium for storing computer-executable instructions that, when executed by a processor, implement the above-described process.

[0101] The storage medium in this embodiment can implement the various processes of the above-described electromagnetic detection method embodiments and achieve the same effects and functions, which will not be repeated here.

[0102] Another embodiment of this disclosure also provides a computer program product, which includes a computer program that, when executed by a processor, implements the above-described process.

[0103] The computer program product in this embodiment can implement the various processes of the above-described electromagnetic detection method embodiments and achieve the same effects and functions, which will not be repeated here.

[0104] In various embodiments of this disclosure, the computer-readable storage medium includes read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk, etc.

[0105] In the 1990s, improvements to a technology could be clearly distinguished as either hardware improvements (e.g., improvements to the circuit structure of diodes, transistors, switches, etc.) or software improvements (improvements to the methodology). However, with technological advancements, many methodological improvements today can be considered direct improvements to the hardware circuit structure. Designers almost always obtain the corresponding hardware circuit structure by programming the improved methodology into the hardware circuit. Therefore, it cannot be said that a methodological improvement cannot be implemented using hardware physical modules. For example, a Programmable Logic Device (PLD) (such as a Field Programmable Gate Array (FPGA)) is such an integrated circuit whose logic function is determined by the user programming the device. Designers can program and "integrate" a digital system onto a PLD themselves, without needing chip manufacturers to design and manufacture dedicated integrated circuit chips. Furthermore, nowadays, instead of manually manufacturing integrated circuit chips, this programming is mostly implemented using "logic compiler" software. Similar to the software compiler used in program development, the original code before compilation must also be written in a specific programming language, called a Hardware Description Language (HDL). There are many HDLs, such as ABEL (Advanced Boolean Expression Language), AHDL (Altera Hardware Description Language), Confluence, CUPL (Cornell University Programming Language), HDCal, JHDL (Java Hardware Description Language), Lava, Lola, MyHDL, PALASM, and RHDL (Ruby Hardware Description Language). Currently, the most commonly used are VHDL (Very-High-Speed ​​Integrated Circuit Hardware Description Language) and Verilog. Those skilled in the art should also understand that by simply performing some logic programming on the method flow using one of these hardware description languages ​​and programming it into an integrated circuit, the hardware circuit implementing the logical method flow can be easily obtained.

[0106] The controller can be implemented in any suitable manner. For example, it can take the form of a microprocessor or processor and a computer-readable medium storing computer-readable program code (e.g., software or firmware) executable by the (micro)processor, logic gates, switches, application-specific integrated circuits (ASICs), programmable logic controllers, and embedded microcontrollers. Examples of controllers include, but are not limited to, the following microcontrollers: ARC 625D, Atmel AT91SAM, Microchip PIC18F26K20, and Silicon Labs C8051F320. A memory controller can also be implemented as part of the control logic of the memory. Those skilled in the art will also recognize that, in addition to implementing the controller in purely computer-readable program code form, the same functionality can be achieved by logically programming the method steps to make the controller take the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers. Therefore, such a controller can be considered a hardware component, and the means included therein for implementing various functions can also be considered as structures within the hardware component. Alternatively, the means for implementing various functions can be considered as both software modules implementing the method and structures within the hardware component.

[0107] The systems, devices, modules, or units described in the above embodiments can be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, a computer can be, for example, a personal computer, laptop computer, cellular phone, camera phone, smartphone, personal digital assistant, media player, navigation device, email device, game console, tablet computer, wearable device, or any combination of these devices.

[0108] For ease of description, the above apparatus is described by dividing it into various functional units. Of course, in implementing the embodiments of this disclosure, the functions of each unit can be implemented in one or more software and / or hardware.

[0109] Those skilled in the art will understand that one or more embodiments of this disclosure can be provided as a method, system, or computer program product. Therefore, one or more embodiments of this disclosure can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, one or more embodiments of this disclosure can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0110] This disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0111] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0112] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0113] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0114] One or more embodiments of this disclosure can be described in the general context of computer-executable instructions, such as program modules, that are executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform a particular task or implement a particular abstract data type. One or more embodiments of this disclosure can also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via a communication network. In a distributed computing environment, program modules can reside in local and remote computer storage media, including storage devices.

[0115] The various embodiments in this disclosure are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0116] The above are merely embodiments of this disclosure and are not intended to limit the scope of this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of the claims of this disclosure.

Claims

1. An electromagnetic detection device, characterized in that, The device includes: Transmitting module, receiving module, position adjustment module, and turns adjustment module; The transmitting module includes inner and outer nested transmitting coils, which include an inner transmitting coil and an outer transmitting coil. The inner transmitting coil and the outer transmitting coil are wound in the same direction, and are used to generate primary fields in opposite directions in the region between the inner transmitting coil and the outer transmitting coil when the same pulse current passes through, thus forming a specific magnetic field region. The receiving module includes a receiving coil, the projection of which onto the plane of the transmitting module lies entirely within the specific magnetic field region. When the magnetic flux in the specific magnetic field region is not zero, and is adjusted to zero by the region magnetic flux adjustment module, the receiving module receives the secondary field signal generated by the target to be detected, thereby obtaining a specified physical property of the target based on the secondary field signal. The region magnetic flux adjustment module includes at least one of the following: The position adjustment module is located on the transmitting module and is provided with a sliding component. The receiving module is located on the sliding component. The sliding component slides along a direction perpendicular to the plane of the transmitting module to adjust the position of the receiving module relative to the transmitting module. The position adjustment module is used to adjust the magnetic flux of the specific magnetic field region to zero by adjusting the position of the receiving module relative to the transmitting module. The turns adjustment module is located on the transmitting module and is equipped with a turns adjustment component. The turns adjustment component is used to adjust the number of turns of the working coil in the inner transmitting coil by connecting to different positions of the inner transmitting coil. The working coil is a coil that participates in the current loop when the transmitting module transmits current. The turns adjustment module is used to adjust the magnetic flux of the specific magnetic field region to zero by adjusting the number of turns of the working coil in the inner transmitting coil.

2. The apparatus according to claim 1, characterized in that, The launching module also includes a guide rail, and the position adjustment module is connected to the launching module through the guide rail. The position adjustment module also includes a knob, a ball screw, a guide rod, and a slide rail. The knob is connected to the ball screw and rotates the ball screw when it is rotated. The sliding assembly is mounted on the slide rail via the ball screw and the guide rod. The slide rail slides on the guide rail of the launching module. When the ball screw is rotated, it drives the sliding assembly to slide along the guide rod.

3. The apparatus according to claim 1, characterized in that, The inner transmitting coil is an insulated wire; the outer insulating layer of the inner transmitting coil has an opening; the turns adjustment component is a slider; the slider is connected to the inner transmitting coil through the opening; The slider moves along the inner transmitting coil and connects with openings at different positions of the inner transmitting coil during the movement to adjust the number of turns of the working coil in the inner transmitting coil.

4. The apparatus according to claim 1, characterized in that, The inner transmitting coil is provided with a movable insulating block; the number of turns adjustment component is a snap-fit; As the movable insulating blocks move, the latch connects to different positions of the inner transmitting coil through the area between the movable insulating blocks to adjust the number of turns of the working coil in the inner transmitting coil.

5. The apparatus according to claim 1, characterized in that, The device also includes a transmitter; the transmitter is used to transmit pulsed current to the transmitting module.

6. The apparatus according to claim 5, characterized in that, The signal input terminals of the turns adjustment module are connected to the transmitter and the turns adjustment component, respectively.

7. An electromagnetic detection method, applied to the apparatus as described in any one of claims 1-6, characterized in that, The method includes: The magnetic flux in the specific magnetic field region is detected to be zero, and the detection result is obtained. If the detection result is negative, the region magnetic flux adjustment module performs a region magnetic flux adjustment operation to adjust the magnetic flux of the specific magnetic field region to zero; the region magnetic flux adjustment operation includes at least one of the following: sliding the sliding component on the position adjustment module; adjusting the position of the turns adjustment component of the turns adjustment module and the inner transmitting coil; Based on the secondary field signal generated by the target being detected received by the receiving module in the specific magnetic field region where the magnetic flux is zero, the specified physical properties of the target being detected are obtained.

8. An electromagnetic detection device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the steps of the method as described in claim 7.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium is used to store computer-executable instructions that, when executed by a processor, implement the steps of the method described in claim 7.

10. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the steps of the method described in claim 7.

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