Orthogonal coil low-frequency electromagnetic wave absorption shielding backboard device and method

Abstract

The invention provides an orthogonal coil low-frequency electromagnetic wave absorption shielding backboard device and method. The orthogonal coil low-frequency electromagnetic wave absorption shielding backboard device comprises a low-frequency electromagnetic wave absorption shielding backboard, a backboard support and an orthogonal coil, the low-frequency electromagnetic wave absorption shielding backboard sequentially comprises a copper net tin oxide electric field absorption film, a nickel-iron alloy particle magnetic field absorption film and a carbon-based material filling polymer composite film from outside to inside, the backboard support is rotatably connected with the back of the low-frequency electromagnetic wave absorption backboard, and a control port is formed in the bottom of the backboard support. The orthogonal coil is connected with the backboard support through the base support and arranged on the inner side of the low-frequency electromagnetic wave absorbing and shielding backboard. A multi-layer material composite structure is adopted, low-frequency electromagnetic waves which cannot be utilized are absorbed by arranging the low-frequency electromagnetic wave absorption shielding backboard behind the orthogonal coil, and the problem of electromagnetic wave interference is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of geophysical exploration, and in particular relates to an orthogonal coil low-frequency electromagnetic wave absorption and shielding backplane device and method. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] In geophysical exploration, orthogonal coils use two sets of field sources to send different high-order pseudo-random signals respectively. Each set of high-order pseudo-random signals can contain enough frequency for a complete frequency band. The exploration frequencies of the two sets of signals are completely staggered, so that two field sources can be emitted simultaneously, effectively improving exploration efficiency and data volume. However, in complex underground environments, high-order pseudo-random signals are susceptible to interference and attenuation from a variety of factors. Traditional low-frequency electromagnetic wave absorption and shielding devices are made of simple materials and are difficult to simultaneously deal with different electromagnetic waves in a wide frequency band. They cannot effectively distinguish and shield low-frequency electromagnetic waves that are difficult to use, affecting the accuracy of exploration results. In addition, existing absorption and shielding devices show insufficient adaptability in complex underground environments, are easily affected by external physical vibrations or other environmental factors, and are difficult to achieve precise directional control according to underground conditions, further affecting the efficiency and accuracy of the overall exploration work and failing to meet the needs of high-precision exploration. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes an orthogonal coil low-frequency electromagnetic wave absorption and shielding backplane device and method, which adopts a multi-layer material composite structure and arranges a low-frequency electromagnetic wave absorption and shielding backplane behind the orthogonal coil to absorb unusable low-frequency electromagnetic waves and solve the problem of interference with electromagnetic waves. At the same time, a backplane support is arranged to adjust the position and angle of the absorption device through a control port, thereby solving the problem of difficult to achieve stable positioning of the device and precise directional control in a complex underground environment.

[0005] According to some embodiments, the present invention adopts the following technical solutions:

[0006] An orthogonal coil low-frequency electromagnetic wave absorption and shielding backplane device comprises a low-frequency electromagnetic wave absorption and shielding backplane, a backplane support and an orthogonal coil, wherein the low-frequency electromagnetic wave absorption and shielding backplane comprises, from the outside to the inside, a copper mesh tin oxide electric field absorption film, a nickel-iron alloy particle magnetic field absorption film and a carbon-based material filled polymer composite film, the backplane support is rotatably connected to the back of the low-frequency electromagnetic wave absorption backplane, a control port is arranged at the bottom thereof, and the orthogonal coil is connected to the backplane support via a base support, and is arranged on the inner side of the low-frequency electromagnetic wave absorption and shielding backplane.

[0007] As an optional implementation, the low-frequency electromagnetic wave absorption and shielding back plate is a curved rectangular structure and is bent toward the orthogonal coil.

[0008] As an optional implementation, the back side of the low-frequency electromagnetic wave absorption and shielding back plate is provided with a coating, and the coating includes an aluminum oxide coating and a titanium nitride coating.

[0009] As an optional embodiment, the copper mesh tin oxide electric field absorption film includes a tin oxide layer and a surface copper mesh arranged on its surface, the surface copper mesh is an array structure formed by multiple hexagonal pore structures, and the tin oxide layer is tightly attached to the inner side of the surface copper mesh to form an integrated structure.

[0010] As an optional embodiment, the nickel-iron alloy particle magnetic field absorption film is pressed into a sheet from nickel-iron magnetic alloy particles, the surface of which has a concave-convex structure and is fixed between the copper mesh tin oxide electric field absorption film and the carbon-based material filled polymer composite film.

[0011] As an optional implementation, the carbon-based material filled polymer composite film is a composite structure of carbon nanotubes and conductive polymer materials, and the conductive polymer materials are polypyrrole and polyaniline, which are fixed to the inner layer of the low-frequency electromagnetic wave absorption and shielding backplane.

[0012] As an optional implementation, a plurality of fixed buckle structures are provided on both sides of the low-frequency electromagnetic wave absorption and shielding back plate, and each fixed buckle structure is fixedly connected to the film layer and the back plate.

[0013] As an optional embodiment, the orthogonal coil includes two mutually perpendicular transmitting coils, the transmitting coils are limited by a fixing member, the orthogonal coil is provided with a coil power interface, the coil power interface is connected to an external power supply device, and an insulating gasket is provided between the coil and the base bracket.

[0014] As an optional implementation, the backplane support is made of aluminum alloy material with an anodized surface. A fixing ring and a carbon fiber support rod are arranged inside the support, and the fixing ring is sleeved on the outside of the carbon fiber support rod. The top of the backplane support is connected to the back of the low-frequency electromagnetic wave absorbing backplane through a control rotating head.

[0015] As an optional implementation, the control interface is arranged at the bottom of the base, and is connected to an external control system and a power supply device through a control port, and the control port includes a power interface, an input interface and an output interface.

[0016] The working method of the orthogonal coil low-frequency electromagnetic wave absorption and shielding backplane device comprises the following steps:

[0017] Assemble the device and connect external cables, which are laid out along the designated path;

[0018] Power on the device for testing, calibrate the device horizontally and vertically, adjust the height and angle of the device so that it faces the target area, test the signal transmission function of the transmitting coil in turn, and confirm that the electromagnetic wave absorption and shielding functions of the device are operating normally by sending standard signals and receiving spectrum feedback;

[0019] After the test is completed, the transmitting coil starts to transmit the predetermined full-band pseudo-random signal;

[0020] The unusable low-frequency electromagnetic waves are gradually processed by the low-frequency electromagnetic wave absorption and shielding backplane. The copper mesh tin oxide electric field absorption film absorbs the electric field components, the nickel-iron alloy particle magnetic field absorption film shields and absorbs the magnetic field components, and the carbon-based material filled polymer composite film reflects and refracts the electromagnetic waves internally, further absorbing and shielding the remaining low-frequency electromagnetic waves. After collection and shielding processing, the electromagnetic wave absorption spectrum is transmitted to the data analysis and processing system.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention rationally configures a multi-layer material composite structure. By arranging a low-frequency electromagnetic wave absorption and shielding material backboard behind the orthogonal coil, when the electromagnetic wave is incident on the surface of the absorption plate, it passes through the copper mesh tin oxide electric field absorption film and the nickel-iron alloy particle magnetic field absorption film to enter the interior of the absorption plate and reach the carbon-based material filled polymer composite film, and is repeatedly refracted and reflected by the internal composite film. Due to the phase interference resonance of the incident, reflected and refracted electromagnetic waves, electromagnetic energy will be lost, thereby effectively absorbing the electromagnetic waves that cannot be used, reducing the influence of electromagnetic interference, and improving the accuracy of electromagnetic detection.

[0023] The present invention provides a control base to achieve flexible adjustment of position and angle, thereby solving the problems of device instability and low directional control accuracy in complex underground environments. The device can adapt to different environmental requirements, output the electromagnetic wave absorption spectrum through the control port, and intuitively display the absorption effect, thereby achieving stable electromagnetic detection in various complex terrains.

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] Figure 1 A front view of a low-frequency electromagnetic wave absorbing and shielding back plate of an orthogonal coil according to an embodiment;

[0027] Figure 2A side view of a low-frequency electromagnetic wave absorbing and shielding back plate of an orthogonal coil according to an embodiment;

[0028] Figure 3 It is a schematic diagram of assembling the film layers of the orthogonal coil low-frequency electromagnetic wave absorption and shielding back plate according to an embodiment;

[0029] Figure 4 A schematic cross-sectional view of a back plate support of an orthogonal coil low-frequency electromagnetic wave absorption and shielding back plate according to an embodiment;

[0030] Among them, 1 is a fixing buckle, 2 is an insulating rod, 3 is an insulating gasket, 4 is a transmitting coil, 5 is a fixing nut, 6 is a coil power interface, 7 is a base bracket, 8 is a reinforcing rib, 9 is a carbon fiber connecting rod, 10 is a control rotor, 11 is a copper mesh tin oxide electric field absorption film, 12 is a nickel-iron alloy particle magnetic field absorption film, 13 is a carbon-based material filled polymer composite film, 14 is a control port, 15 is a device power interface, 16 is an input interface, 17 is an output interface, 18 is an interface protection cover, 19 is a fixing ring, and 20 is a carbon fiber support rod.

[0031] In order to show the positions of various parts, the distances or sizes between them are exaggerated and the schematic diagram is for reference only. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] It should be noted that the following detailed descriptions are all illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0034] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0035] The terms "install", "connect", "connect", "fix" and the like in the present invention should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection, a direct connection, or an indirect connection through an intermediate medium, an internal connection between two elements, or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0036] In the absence of conflict, the embodiments in this application and the features in the embodiments may be combined with each other.

[0037] As introduced in the background technology, the existing low-frequency electromagnetic wave absorption and shielding devices are usually made of simple materials, which are difficult to effectively process different electromagnetic waves in a wide frequency band. The limitation is that it is impossible to shield electromagnetic waves of all frequency bands at the same time, especially it is difficult to shield low-frequency electromagnetic waves, which has a negative impact on the accuracy of exploration results. In addition, the existing absorption and shielding devices are not adaptable enough in complex underground environments, and are easily affected by external physical vibrations and other environmental factors, making it difficult to achieve precise directional control for underground conditions. In order to solve the above technical problems, this embodiment proposes an orthogonal coil low-frequency electromagnetic wave absorption and shielding material backplane device.

[0038] like Figure 1 As shown, as a typical implementation of the present invention, Figure 1 As shown, the orthogonal coil low-frequency electromagnetic wave absorption and shielding material backplane device disclosed in this embodiment includes a low-frequency electromagnetic wave absorption and shielding backplane, a backplane support and an orthogonal coil.

[0039] The low-frequency electromagnetic wave absorption and shielding backplane has a curved rectangular structure, such as Figure 3 As shown, it includes a copper mesh tin oxide electric field absorption film 11, a nickel-iron alloy particle magnetic field absorption film 12 and a carbon-based material filled polymer composite film 13, and each film layer is connected and bonded by a plurality of fixing buckles 1;

[0040] In this embodiment, the fixing buckles 1 are arranged around the low-frequency electromagnetic wave absorption and shielding back panel to ensure the stability of the connection; a number of reinforcing ribs 8 are arranged on the back surface of the back panel to prevent the back panel from deformation, and it is coated with an aluminum oxide coating and a titanium nitride coating. A carbon fiber connecting rod 9 is arranged in the middle of the back of the back panel and is fixedly connected to the control rotating head 10 at the top of the base.

[0041] The material of the back plate support is an aluminum alloy material with anodized surface, such as Figure 2 As shown, a control turntable 10 is arranged on the top of the base plate and can be rotated and adjusted around the vertical axis and the horizontal axis.

[0042] like Figure 4 As shown, a fixing ring 19 with a 60-degree thread angle and a carbon fiber support rod 20 are provided inside the back panel support, and the fixing ring 19 is sleeved on the upper outside of the carbon fiber support rod 20 to ensure that the device has sufficient mechanical strength and stability during use.

[0043] A control port 14 is provided at the bottom of the back panel support. The control interface includes a device power interface 15, an input interface 16 and an output interface 17. The device power interface 15 is connected to an external power supply device. The output interface 16 is used to transmit a spectrum feedback signal of the device working status. The input interface 17 is used to receive external direction angle control instructions. An interface protection cover 18 is provided outside the control interface to prevent dust and moisture from entering the internal circuit.

[0044] The orthogonal coil is composed of two mutually perpendicular transmitting coils 4, the main material of the coil is copper wire, and polyimide insulating gaskets 3 are respectively arranged on the top and bottom of the orthogonal coil. The shape of the insulating gasket 3 is circular or square, and its diameter or side length matches the size of the coil to ensure that the gasket can completely cover the coil contact surface; the orthogonal coil is limited by the top fixing nut 5 and the middle insulating rod 2, and the bottom is connected to the external power supply device by the coil power interface 6, and is connected to the backplane support through the base bracket 7.

[0045] like Figure 3 As shown, the copper mesh tin oxide electric field absorption film 11 is a conductive coating layer structure made of a surface copper mesh and a tin oxide layer, fixed to the outer layer of the low-frequency electromagnetic wave absorption shielding backplane, and the film layer thickness is 5 mm. The surface copper mesh is a multi-hexagonal pore structure with a hexagonal side length of 30 cm. The tin oxide layer is tightly attached to the inner side of the surface copper mesh to form an integrated structure.

[0046] The nickel-iron alloy particle magnetic field absorption film 12 is the middle layer of the low-frequency electromagnetic wave absorption shielding backplane. It is pressed into a sheet from nickel-iron magnetic alloy particles and fixed between the copper mesh tin oxide electric field absorption film and the carbon-based material filled polymer composite film. The surface has a millimeter-level concave-convex structure and the film layer thickness is 3 mm.

[0047] The carbon-based material filled polymer composite film 13 is a composite structure of carbon nanotubes and conductive polymer materials. The conductive polymer materials are polypyrrole and polyaniline, which are fixed to the inner layer of the low-frequency electromagnetic wave absorption and shielding backplane. The film layer thickness is 5 mm.

[0048] Of course, the settings of the various parameters in the above embodiment are only preferred implementations of this embodiment. In other embodiments, the sizes of the above parameters can be adjusted and replaced according to the detection environment and requirements.

[0049] The specific working methods are as follows:

[0050] When arriving at the survey area for electromagnetic exploration, first connect the carbon fiber connecting rod 9 by controlling the rotating head 10. After completing the initial fixation, connect the external cables, including the device power line, coil power line, input signal line and output signal line, through the control port 14 and the coil power interface 6 to ensure that they are firmly installed. The cables should be arranged along the specified path.

[0051] After the electrical connection is completed, the device is powered on for testing, and the device is calibrated horizontally and vertically using external instruments. The height and angle of the device are adjusted so that it faces the target area. The signal transmission function of the transmitting coil 4 is tested in turn. By sending standard signals and receiving spectrum feedback, it is confirmed that the electromagnetic wave absorption and shielding functions of the device are operating normally. All test data should be recorded and compared with the preset standards to ensure that the working parameters of the equipment meet the design requirements.

[0052] After the test is completed, the transmitting coil 4 starts to transmit a full-band pseudo-random signal from 1 Hz to 40 kHz. The signal transmission is automatically controlled by the system's built-in program to ensure coverage of the target area.

[0053] The unusable low-frequency electromagnetic waves are gradually processed by the low-frequency electromagnetic wave absorption and shielding backplane. The outer copper mesh tin oxide electric field absorption film 11 of the backplane absorbs the electric field components, the middle nickel-iron alloy particle magnetic field absorption film 12 shields and absorbs the magnetic field components, and the inner carbon-based material filled polymer composite film 13 internally reflects and refracts electromagnetic waves, further absorbing and shielding the remaining low-frequency electromagnetic waves, reducing background noise and electromagnetic wave interference. After absorption and shielding processing, the electromagnetic signal transmits the electromagnetic wave absorption spectrum to the data analysis and processing system through the output interface 17, and the data analysis process is automatically executed by the equipment.

[0054] After the exploration mission is completed, the device is shut down and maintenance inspections are carried out to ensure the integrity of the equipment and its normal operation in subsequent missions. The maintenance inspection includes material status assessment of the copper mesh tin oxide electric field absorption film 11, the nickel-iron alloy particle magnetic field absorption film 12, and the carbon-based material filled polymer composite film 13, as well as functional testing of the electrical connection parts.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made by those skilled in the art within the spirit and principle of the present invention without creative labor shall be included in the protection scope of the present invention.

Claims

1. An orthogonal coil low-frequency electromagnetic wave absorption and shielding backplane device, characterized in that: It includes a low-frequency electromagnetic wave absorption and shielding backplane, a backplane support and an orthogonal coil. The low-frequency electromagnetic wave absorption and shielding backplane includes, from the outside to the inside, a copper mesh tin oxide electric field absorption film, a nickel-iron alloy particle magnetic field absorption film and a carbon-based material filled polymer composite film. The backplane support is rotatably connected to the back of the low-frequency electromagnetic wave absorption backplane, and a control port is arranged at the bottom. The orthogonal coil is connected to the backplane support through a base bracket and is arranged on the inner side of the low-frequency electromagnetic wave absorption and shielding backplane.

2. The orthogonal coil low-frequency electromagnetic wave absorption and shielding backplane device as claimed in claim 1, characterized in that: The low-frequency electromagnetic wave absorption and shielding back plate is a curved rectangular structure and is bent toward the orthogonal coil; Alternatively, a coating is provided on the back side of the low-frequency electromagnetic wave absorption and shielding back plate, and the coating includes an aluminum oxide coating and a titanium nitride coating.

3. The orthogonal coil low-frequency electromagnetic wave absorption and shielding backplane device as claimed in claim 1, characterized in that: The copper mesh tin oxide electric field absorption film comprises a tin oxide layer and a surface copper mesh arranged on the surface thereof. The surface copper mesh is an array structure formed by a plurality of hexagonal pore structures. The tin oxide layer is closely attached to the inner side of the surface copper mesh to form an integrated structure.

4. The orthogonal coil low-frequency electromagnetic wave absorption and shielding backplane device as claimed in claim 1, characterized in that: The nickel-iron alloy particle magnetic field absorption film is pressed into a sheet by nickel-iron magnetic alloy particles, and its surface has a concave-convex structure and is fixed between the copper mesh tin oxide electric field absorption film and the carbon-based material filled polymer composite film.

5. The orthogonal coil low-frequency electromagnetic wave absorption and shielding backplane device as claimed in claim 1, characterized in that: The carbon-based material filled polymer composite film is a composite structure of carbon nanotubes and conductive polymer materials. The conductive polymer materials are polypyrrole and polyaniline, which are fixed on the inner layer of the low-frequency electromagnetic wave absorption and shielding back plate.

6. The orthogonal coil low-frequency electromagnetic wave absorption and shielding backplane device as claimed in claim 1, characterized in that: A plurality of fixed buckle structures are arranged on both sides of the low-frequency electromagnetic wave absorption and shielding back plate, and each fixed buckle structure is fixedly connected to the film layer and the back plate.

7. The orthogonal coil low-frequency electromagnetic wave absorption and shielding backplane device as claimed in claim 1, characterized in that: The orthogonal coil includes two mutually perpendicular transmitting coils, the transmitting coil is limited by a fixing member, the orthogonal coil is provided with a coil power interface, the coil power interface is connected to an external power supply device, and an insulating gasket is provided between the coil and the base bracket.

8. The orthogonal coil low-frequency electromagnetic wave absorption and shielding backplane device as claimed in claim 1, characterized in that: The back panel support is made of aluminum alloy material, and its surface is anodized. A fixing ring and a carbon fiber support rod are arranged inside the support, and the fixing ring is sleeved on the outside of the carbon fiber support rod. The top of the back panel support is connected to the back of the low-frequency electromagnetic wave absorbing back panel through a control rotating head.

9. The orthogonal coil low-frequency electromagnetic wave absorption and shielding backplane device as claimed in claim 1, characterized in that: The control interface is arranged at the bottom of the base, and is connected to an external control system and a power supply device through a control port, wherein the control port includes a power supply interface, an input interface and an output interface.

10. A working method of the orthogonal coil low-frequency electromagnetic wave absorption and shielding backplane device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Assemble the device and connect external cables, which are laid out along the designated path; Power on the device for testing, calibrate the device horizontally and vertically, adjust the height and angle of the device so that it faces the target area, test the signal transmission function of the transmitting coil in turn, and confirm that the electromagnetic wave absorption and shielding functions of the device are operating normally by sending standard signals and receiving spectrum feedback; After the test is completed, the transmitting coil starts to transmit the predetermined full-band pseudo-random signal; The unusable low-frequency electromagnetic waves are gradually processed by the low-frequency electromagnetic wave absorption and shielding backplane. The copper mesh tin oxide electric field absorption film absorbs the electric field components, the nickel-iron alloy particle magnetic field absorption film shields and absorbs the magnetic field components, and the carbon-based material filled polymer composite film reflects and refracts the electromagnetic waves internally, further absorbing and shielding the remaining low-frequency electromagnetic waves. After collection and shielding processing, the electromagnetic wave absorption spectrum is transmitted to the data analysis and processing system.

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