Electromagnetic method detection device

Abstract

The utility model discloses an electromagnetic method detection device which comprises a transmitting coil, receiving coils and an electromagnetic method detector, the transmitting coil is a single-layer solenoid, the distance between every two circles of wires of the single-layer solenoid is equal, the two receiving coils with the same specification are symmetrically arranged at the two ends of the transmitting coil, and the electromagnetic method detector is arranged on the receiving coils. The two receiving coil terminals are reversely connected in series to form a pair of signal output terminals, and the transmitting coil input end and the receiving coil output terminals are respectively connected to the current output end and the signal input end of an electromagnetic method detector to form a differential electromagnetic method detection device. The electromagnetic method detection device adopts a single-layer solenoid for emission, so that the self-inductance coefficient is reduced, the electromagnetic field emission efficiency is improved, a differential mode is adopted for signal receiving, primary field interference can be counteracted, and the receiving and transmitting integrated device can cooperatively improve the precision and resolution of electromagnetic method detection.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic detection technology, and in particular relates to an electromagnetic detection device. Background Technology

[0002] Electromagnetic detection is a method that infers the structure and properties of underground materials by studying the differences in electrical conductivity and magnetic permeability of underground rocks or mineral bodies and the temporal and spatial distribution patterns of electromagnetic fields.

[0003] In electromagnetic field detection, coils are typically used to transmit and receive electromagnetic fields. The transmitting coil generates a changing current, exciting the underground medium to produce an electromagnetic response signal. The receiving coil receives these response signals and infers the underground geological structure by analyzing the amplitude and phase information of the signals. In existing coil devices, both the transmitting and receiving coils are mostly wound in a multi-layered, tightly wound manner. This results in inconsistent uniformity and tightness, leading to poor structural stability. Under external stress or temperature changes, loosening or deformation may occur, affecting coil performance. Especially for transmitting coils, the high self-inductance and long off-time of multi-layered, tightly wound coils result in weak signals coupled to the receiving coil. When the transmitting coil operates with a large current for an extended period, it generates significant heat, and poor heat dissipation can cause coil deformation, leading to measurement errors or unstable data. Furthermore, while increasing the number of layers can increase the number of turns in multi-layered, tightly wound coils, this also introduces additional resistance and capacitance. The proximity effect and skin effect increase coil resistance losses, and poor stability directly limits its bandwidth performance. Summary of the Invention

[0004] The main objective of this invention is to provide an electromagnetic detection device. This device uses a single-layer solenoid transmitter to reduce the self-inductance coefficient and improve the electromagnetic field transmission efficiency. The receiving signal adopts a differential mode, which can cancel primary field interference. The integrated transceiver device can work together to improve the accuracy and resolution of electromagnetic detection.

[0005] Therefore, this utility model provides an electromagnetic detection device, including a transmitting coil, a receiving coil, and an electromagnetic detector. The transmitting coil is a single-layer solenoid, and the distance between each turn of the conductor in the single-layer solenoid is equal. Two receiving coils of the same specification are symmetrically arranged at both ends of the transmitting coil. The terminals of the two receiving coils are connected in reverse series to form a pair of signal output terminals. The input terminal of the transmitting coil and the output terminal of the receiving coil are respectively connected to the current output terminal and the signal input terminal of the electromagnetic detector, thus constituting a differential electromagnetic detection device.

[0006] Specifically, both the transmitting coil and the receiving coil are wound in a spiral manner on a non-metallic support, which can be a plastic support or a wooden support.

[0007] Specifically, the non-metallic support includes a first cylindrical section in the middle and second cylindrical sections at both ends. The diameter of the second cylindrical section is larger than the diameter of the first cylindrical section. The transmitting coil is wound on the first cylindrical section, and the two receiving coils are wound on the two second cylindrical sections respectively.

[0008] Specifically, a soft magnetic core is implanted inside the non-metallic stent.

[0009] Compared with the prior art, the present invention has the following advantages: In the electromagnetic exploration device, the use of a single-layer solenoid transmitter reduces the self-inductance coefficient and improves the electromagnetic field transmission efficiency. The reception signal adopts a differential mode, which can cancel primary field interference. The integrated transceiver device can work together to improve the accuracy and resolution of electromagnetic detection. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the electromagnetic detection device provided in an embodiment of the present invention;

[0012] Figure 2 This is a cross-sectional view of a non-metallic bracket;

[0013] The components include: 1. transmitting coil; 2. receiving coil; 3. electromagnetic detector; 4. non-metallic support; and 5. soft magnetic core. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0016] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0017] See Figure 1 An electromagnetic detection device includes a transmitting coil 1, a receiving coil 2, and an electromagnetic detector 3. The transmitting coil 1 is a single-layer solenoid with equal spacing between each turn of the wire. Two identical receiving coils 2 are symmetrically arranged at both ends of the transmitting coil 1, and their terminals are connected in reverse series to form a pair of signal output terminals. The input terminal of the transmitting coil 1 and the output terminal of the receiving coil are respectively connected to the current output terminal and the signal input terminal of the electromagnetic detector 3, constituting a differential electromagnetic detection device. "Identical specifications" refers to the coil support, winding method, winding material, soft magnetic core, shape, size, and number of turns being completely identical.

[0018] In this embodiment, the transmitting coil 1 is a single-layer solenoid. As a transmitter, the single-layer solenoid can generate a relatively uniform magnetic field. This uniform magnetic field distribution means that the receiving coil can receive stable energy or signals over a wider area. Inductance is a crucial parameter of the coil, determining its response speed to changes in current. When the current changes, the single-layer solenoid maintains a relatively stable inductance value, reducing system instability caused by inductance variations. Furthermore, the simple and symmetrical structure of the single-layer solenoid helps reduce electromagnetic interference and noise caused by structural asymmetry. This symmetry also enhances the coil's mechanical stability and durability.

[0019] The transmitting coil of the electromagnetic detection device in this application adopts a single-layer solenoid. The solenoid is simple and uniformly wound, with small fluctuations in coil resistance and capacitance, and a stable quality factor Q value. This reduces the self-inductance coefficient and improves the electromagnetic field transmission efficiency. The receiving signal adopts a differential mode, which can cancel primary field interference. The integrated transceiver device can synergistically improve the accuracy and resolution of electromagnetic detection.

[0020] See Figure 1 and Figure 2 It is understood that both the transmitting coil 1 and the receiving coil 2 are wound spirally onto a non-metallic support 4, which can be made of plastic or wood. Furthermore, to enhance the magnetic field strength, reduce magnetic resistance, and improve electromagnetic induction, an implantation cavity is provided inside the non-metallic support 4, and a soft magnetic core 5 is implanted within this cavity. The soft magnetic core can be made of materials such as iron-silicon alloys, iron-aluminum alloys, or soft magnetic ferrite.

[0021] See Figure 1 Specifically, the non-metallic support 4 includes a first cylindrical section in the middle and second cylindrical sections at both ends. The diameter of the second cylindrical section is larger than that of the first cylindrical section. A transmitting coil of length L is wound on the first cylindrical section. Two receiving coils are wound on the two second cylindrical sections respectively. The two receiving coils are flush with the two ends of the transmitting coil 1 and are spaced L apart. The terminals of the two receiving coils are connected in reverse series to form a pair of signal output terminals. The input terminal of the transmitting coil and the output terminal of the receiving coil are respectively connected to the current output terminal and the signal input terminal of the electromagnetic detection instrument, thus forming a differential electromagnetic detection device.

[0022] Its typical characteristics are that the transmitting coil 1 and the receiving coil 2 are single-layer wound solenoids. Either of the two receiving coils is aligned with the working surface. When the two receiving coils 2 are excited by the transmitting coil 1, theoretically, the coupling signals of the primary field collected by the two coils are exactly the same. In other words, the background signals they receive under the relative working surface are completely identical. The difference obtained by eliminating this background signal through differential calculation is the abnormal information feedback under the working surface. Furthermore, solenoids typically have a long length and a large radius, resulting in a relatively high Q value. The Q value can be increased by increasing the number of turns in the coil, leading to a larger coil bandwidth and higher measurement accuracy. Moreover, solenoids have good heat dissipation, stable structure, low manufacturability and cost-effectiveness, and can be widely used in low-voltage, high-current applications.

[0023] Unless otherwise stated, if any of the technical solutions disclosed in this utility model discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Anyone skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this utility model discloses only some numerical values ​​to illustrate the technical solutions of the invention. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this invention.

[0024] Meanwhile, if the present invention discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured by casting) (except where it is obviously impossible to use an integral forming process).

[0025] Furthermore, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model include states or shapes that are similar to, analogous to, or close to those states or shapes. Any component provided by this utility model can be assembled from multiple individual components or can be a single component manufactured using a one-piece molding process.

[0026] The above embodiments are merely illustrative examples to clearly illustrate the present invention, and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all embodiments here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An electromagnetic detection device, comprising a transmitting coil, a receiving coil, and an electromagnetic detector, characterized in that: The transmitting coil is a single-layer solenoid with equal spacing between each turn of the conductor. Two identical receiving coils are symmetrically arranged at both ends of the transmitting coil. The terminals of the two receiving coils are connected in reverse series to form a pair of signal output terminals. The input terminal of the transmitting coil and the output terminal of the receiving coil are respectively connected to the current output terminal and the signal input terminal of the electromagnetic detector, thus forming a differential electromagnetic detection device.

2. The electromagnetic detection device according to claim 1, characterized in that: Both the transmitting coil and the receiving coil are wound in a spiral manner on a non-metallic support, which can be a plastic support or a wooden support.

3. The electromagnetic detection device according to claim 2, characterized in that: The non-metallic support includes a first cylindrical section in the middle and second cylindrical sections at both ends. The diameter of the second cylindrical section is larger than the diameter of the first cylindrical section. The transmitting coil is wound on the first cylindrical section, and the two receiving coils are wound on the two second cylindrical sections respectively.

4. The electromagnetic detection device according to claim 2, characterized in that: The non-metallic stent has a soft magnetic core implanted inside.

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