Transient electromagnetic coil adaptive damping matching device and method

Abstract

The invention discloses a transient electromagnetic coil adaptive damping matching device and method, and belongs to the technical field of electromagnetic method detection. The device comprises a signal detection unit 100, a receiving coil 200, a control unit 300 and a damping adjusting unit 400, the signal detection unit 100 continuously collects voltage signals output by the receiving coil 200 and transmits the voltage signals to the control unit 300; the control unit 300 receives the voltage signal, analyzes the voltage signal according to a preset damping adjustment algorithm and a damping adjustment model, determines an optimal damping coefficient required by the receiving coil in the current environment, and sends the optimal damping coefficient to the damping adjustment unit 400; the damping adjusting unit 400 adjusts the resistance value of the matching resistor according to the optimal damping coefficient, the problem that signals collected by the receiving coil oscillate or attenuate slowly due to signal distortion caused by improper resistance value of the matching resistor can be avoided, and the stability of the response performance of the receiving coil is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of electromagnetic detection technology, and in particular to a transient electromagnetic coil adaptive damping matching device and method. Background Art

[0002] Transient electromagnetic method is an effective means of detecting and imaging urban underground space. It has the characteristics of sensitivity to low-resistance bodies, strong anti-interference ability, and great detection depth. It can be applied to underground pipeline detection, urban geological disaster investigation, engineering geological survey and other scenarios.

[0003] The receiving coil sensor is the key core module for transient electromagnetic signal reception and can be equivalent to a typical second-order system, such as Figure 1 As shown. The damping coefficient of the receiving coil is an important parameter of the sensor. The directly wound hollow coil is in an underdamped state and will produce time domain oscillations when receiving high-frequency signals. It is necessary to connect a matching resistor R in parallel at both ends of the receiving coil. m Adjust the damping coefficient of the coil to improve the coil oscillation phenomenon. Matching resistor R m An inappropriate resistance value will cause signal distortion, resulting in oscillation or slow decay of the signal collected by the receiving coil, which will affect the analysis of the secondary field signal.

[0004] In addition, the damping of traditional receiving coils is often fixed and cannot adapt to different geological conditions, detection depths, and changes in the electromagnetic environment, resulting in unstable response performance of the receiving coil, and prone to problems such as signal distortion and excessive attenuation, which seriously affects the accuracy and reliability of electromagnetic detection. Summary of the invention

[0005] The embodiment of the present application provides a transient electromagnetic coil adaptive damping matching device and method. The purpose of the embodiment of the present application is to provide a transient electromagnetic coil adaptive damping matching device and method, which can solve how to avoid the matching resistance R m An inappropriate resistance value will cause signal distortion, resulting in oscillation or slow decay of the signal collected by the receiving coil, which will affect the analysis of the secondary field signal.

[0006] In order to solve the above technical problems, this application is implemented as follows: In a first aspect, a transient electromagnetic coil adaptive damping matching device is provided, comprising: a signal detection unit 100, a receiving coil 200, a control unit 300 and a damping adjustment unit 400; wherein: The first end of the signal detection unit 100 is connected to the first output end of the receiving coil 200, the second end of the signal detection unit 100 is connected to the second output end of the receiving coil 200, and the third end of the signal detection unit 100 is connected to the first input end of the control unit 300; The first output terminal of the control unit 300 is connected to the control terminal of the damping adjustment unit 400; The first end of the damping adjustment unit 400 is connected to the first output end of the receiving coil 200, and the second end of the damping adjustment unit 400 is connected to the second output end of the receiving coil 200; The signal detection unit 100 is used to continuously collect the voltage signal output by the receiving coil 200 and transmit it to the control unit 300; The control unit 300 is used to receive the voltage signal, obtain the damping adjustment model, and analyze the voltage signal according to a preset damping adjustment algorithm and the damping adjustment model to determine the optimal damping coefficient required by the receiving coil under the current environment, and send it to the damping adjustment unit 400; The damping adjustment unit 400 is used to adjust the resistance value of the matching resistor according to the optimal damping coefficient.

[0007] Optionally, the control unit 300 analyzes the voltage signal according to a preset damping adjustment algorithm and the damping adjustment model to determine the optimal damping coefficient required by the receiving coil in the current environment in the following manner: The voltage waveform formed by the collected voltage signal is differentiated from the voltage waveform under the optimal damping coefficient in the damping adjustment model to obtain the integral, and the damping coefficient corresponding to the voltage waveform with the smallest integral value is calculated as the optimal damping coefficient required by the receiving coil under the current environment.

[0008] Optionally, the integral formula for obtaining the integral by taking the difference between the voltage waveform formed by the collected voltage signal and the voltage waveform under the optimal damping coefficient in the damping adjustment model is:

[0009] in represents the voltage value of the voltage waveform at the i-th sampling time under the optimal damping coefficient in the damping adjustment model, represents the voltage value of the voltage waveform formed by the collected voltage signal at the i-th sampling moment, n represents the number of sampling points, and f represents the sampling rate.

[0010] Optionally, the control unit 300 analyzes the voltage signal according to a preset damping adjustment algorithm and the damping adjustment model to determine the optimal damping coefficient required by the receiving coil in the current environment in the following manner: The control unit 300 calculates the adjustment time ts for entering the steady state after the shutdown time according to the voltage value of the voltage signal, and compares the adjustment time ts with the optimal adjustment time TS in the damping adjustment model; If ts≤TS, the current damping coefficient is the optimal damping coefficient required by the receiving coil under the current environment; If ts>TS, the current damping coefficient is reduced by a preset value to obtain an adjusted damping coefficient, and the adjusted damping coefficient is used as the optimal damping coefficient required by the receiving coil in the current environment, and the voltage value of the voltage signal after the damping coefficient is adjusted collected by the signal detection unit 100 is continuously received, and the adjustment time ts is recalculated according to the voltage value of the voltage signal after the damping coefficient is adjusted; if the adjustment time ts increases, the adjusted damping coefficient is increased by the preset value and used as the optimal damping coefficient required by the receiving coil in the current environment; if the adjustment time ts decreases, the adjusted damping coefficient is continuously reduced by the preset value and used as the adjusted damping coefficient, and the operation of using the adjusted damping coefficient as the optimal damping coefficient required by the receiving coil in the current environment and continuing to receive the voltage value of the voltage signal after the damping coefficient is adjusted collected by the signal detection unit 100 is repeatedly performed until the recalculated adjustment time ts increases, and the current damping coefficient is increased by the preset value and used as the optimal damping coefficient required by the receiving coil in the current environment.

[0011] Optionally, the control unit 300 calculates the regulation time ts for entering a steady state after the shutdown time according to the voltage value of the voltage signal in the following manner: A curve in which the voltage value of the voltage signal enters a steady state after the off time is used as a response curve; The shortest time required for the response curve to enter and remain in a steady-state range is taken as the adjustment time ts, wherein the steady-state range is the reference value±error range, and the response value of the voltage signal after the shutdown time to enter a steady state is taken as the reference value.

[0012] Optionally, the control unit 300 is further configured to establish the damping adjustment model in the following manner: Obtaining LCR parameters of the receiving coil 200; The LCR parameter is controlled to remain unchanged, and the damping coefficient is adjusted by changing the resistance value of the matching resistor; The corresponding relationship of the transient electromagnetic response process under different damping coefficients is obtained, and the damping adjustment model is established. The damping adjustment model includes: the resistance value, voltage waveform data, and adjustment time corresponding to different damping coefficients, and the resistance value, ideal voltage waveform data, and optimal adjustment time corresponding to the optimal damping coefficient.

[0013] Optionally, the device further includes: a charging and discharging unit 600, The control end of the charging and discharging unit 600 is connected to the second output end of the control unit 300 , and is used to charge and discharge according to the timing pulse output by the control unit 300 , generate a pulse current to excite the target to generate a secondary field to generate the voltage signal in the receiving coil 200 .

[0014] In a second aspect, a transient electromagnetic coil adaptive damping matching method is provided, which is applied to the transient electromagnetic coil adaptive damping matching device as described above, comprising: Continuously collect the voltage signal output by the receiving coil; Obtaining a damping adjustment model; Analyzing the voltage signal according to a preset damping adjustment algorithm and the damping adjustment model to determine an optimal damping coefficient required by the receiving coil under the current environment; The resistance value of the matching resistor is adjusted according to the optimal damping coefficient.

[0015] Optionally, analyzing the voltage signal according to a preset damping adjustment algorithm and the damping adjustment model to determine an optimal damping coefficient required by the receiving coil under a current environment includes: The voltage waveform formed by the collected voltage signal is differentiated from the voltage waveform under the optimal damping coefficient in the damping adjustment model to obtain the integral, and the damping coefficient corresponding to the voltage waveform with the smallest integral value is calculated as the optimal damping coefficient required by the receiving coil under the current environment.

[0016] Optionally, analyzing the voltage signal according to a preset damping adjustment algorithm and the damping adjustment model to determine an optimal damping coefficient required by the receiving coil under a current environment includes: Calculating a regulation time ts for entering a steady state after the shutdown time according to the voltage value of the voltage signal, and comparing the regulation time ts with an optimal regulation time TS in the damping regulation model; If ts≤TS, the current damping coefficient is the optimal damping coefficient required by the receiving coil under the current environment; If ts>TS, the current damping coefficient is reduced by a preset value to obtain an adjusted damping coefficient, and the adjusted damping coefficient is used as the optimal damping coefficient required by the receiving coil in the current environment, and the voltage value of the voltage signal after the damping coefficient is adjusted is continuously received, and the adjustment time ts is recalculated according to the voltage value of the voltage signal after the damping coefficient is adjusted; if the adjustment time ts increases, the adjusted damping coefficient is increased by the preset value and used as the optimal damping coefficient required by the receiving coil in the current environment; if the adjustment time ts decreases, the adjusted damping coefficient is continuously reduced by the preset value and used as the adjusted damping coefficient, and the operation of using the adjusted damping coefficient as the optimal damping coefficient required by the receiving coil in the current environment and continuing to receive the voltage value of the voltage signal after the damping coefficient is adjusted is repeated until the recalculated adjustment time ts increases, and the current damping coefficient is increased by the preset value and used as the optimal damping coefficient required by the receiving coil in the current environment.

[0017] The technical solution provided by this application may have the following beneficial effects: A transient electromagnetic coil adaptive damping matching device and method provided in an embodiment of the present application avoids signal distortion caused by inappropriate resistance of the matching resistor, causing the signal collected by the receiving coil to oscillate or decay more slowly, and affecting the analysis of the secondary field signal. The damping coefficient of the receiving coil can be adaptively adjusted according to different detection environments and working conditions, effectively improving the bandwidth and stability of the receiving coil to the electromagnetic signal and reducing signal distortion and attenuation.

[0018] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0020] Figure 1 The equivalent circuit diagram of the coil sensor connected with the damping matching resistor in the prior art is shown; Figure 2 A schematic structural diagram of a transient electromagnetic coil adaptive damping matching device provided by an exemplary embodiment of the present application is shown; Figure 3 A schematic diagram showing the relationship between the voltage value entering a steady state and the adjustment time after the shutdown time provided by an exemplary embodiment of the present application; Figure 4 A schematic diagram of a working timing waveform of a control unit 300 provided by an exemplary embodiment of the present application is shown; Figure 5 A flow chart of a transient electromagnetic coil adaptive damping matching method provided by an exemplary embodiment of the present application is shown; Figure 6 A flow chart of a transient electromagnetic coil adaptive damping matching method provided by an application example of the present application is shown; Figure 7 A flow chart of a transient electromagnetic coil adaptive damping matching method provided in an application example of the present application is shown. DETAILED DESCRIPTION

[0021] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0022] Figure 2 A schematic structural diagram of a transient electromagnetic coil adaptive damping matching device provided by an exemplary embodiment of the present application is shown.

[0023] like Figure 2 As shown, an exemplary embodiment of the present application provides a transient electromagnetic coil adaptive damping matching device 10, comprising: a signal detection unit 100, a receiving coil 200, a control unit 300 and a damping adjustment unit 400; wherein: a first end of the signal detection unit 100 is connected to a first output end of the receiving coil 200, a second end of the signal detection unit 100 is connected to a second output end of the receiving coil 200, a third end of the signal detection unit 100 is connected to a first input end of the control unit 300; a first output end of the control unit 300 is connected to a control end of the damping adjustment unit 400; a first end of the damping adjustment unit 400 The first output end of the receiving coil 200 is connected, and the second end of the damping adjustment unit 400 is connected to the second output end of the receiving coil 200; the signal detection unit 100 is used to continuously collect the voltage signal output by the receiving coil 200 and transmit it to the control unit 300; the control unit 300 is used to receive the voltage signal, obtain the damping adjustment model, and analyze the voltage signal according to the preset damping adjustment algorithm and the damping adjustment model, determine the optimal damping coefficient required for the receiving coil in the current environment, and send it to the damping adjustment unit 400; the damping adjustment unit 400 is used to adjust the resistance value of the matching resistor according to the optimal damping coefficient.

[0024] In the embodiment of the present application, the signal detection unit 100 continuously and in real time collects the voltage signal output by the receiving coil 200 to form a voltage waveform. The control unit 300 compares and analyzes the voltage waveform with the data in the damping adjustment model, thereby determining in real time the optimal damping coefficient required by the receiving coil in the current environment, thereby avoiding the problem of the matching resistor R m In order to solve the problem of signal distortion caused by inappropriate resistance value, which leads to oscillation or slow attenuation of the signal collected by the receiving coil, the damping coefficient of the receiving coil can be adaptively adjusted according to different detection environments and working conditions, which effectively improves the bandwidth and stability of the receiving coil for electromagnetic signals and reduces signal distortion and attenuation.

[0025] It can be understood that in this embodiment, the control unit 300 can receive control instructions output by a control terminal, such as a computer, and the control unit 300 generates a corresponding control signal according to the control instruction and sends it to the control end of the damping adjustment unit 400 through the output end.

[0026] As an optional implementation in an exemplary embodiment of the present application, Figure 2 As shown, an exemplary embodiment of the present application provides a transient electromagnetic coil adaptive damping matching device, which also includes: a data storage unit 500, wherein the input and output ends of the data storage unit 500 are connected to the second input end of the control unit 300, and are used to store a pre-established damping adjustment model, which is the data obtained by the control unit 300 under different test environments and conditions. The damping adjustment model includes: resistance values, voltage waveform data, and adjustment time corresponding to different damping coefficients, and resistance values, ideal voltage waveform data, and optimal adjustment time corresponding to the optimal damping coefficient. In addition, the data storage unit 500 is also used to store historical detection data and damping adjustment records for query and call by the control unit 300. The storage and analysis of historical data and damping adjustment records by the data storage unit are adaptive and extensible, and can better adapt to the complex and changeable urban environment.

[0027] Specifically, as an optional implementation in an exemplary embodiment of the present application, the control unit 300 analyzes the voltage signal according to a preset damping adjustment algorithm and a damping adjustment model in the following manner to determine the optimal damping coefficient required for the receiving coil under the current environment: the voltage waveform formed by the collected voltage signal is integrated by taking the difference between the voltage waveform under the optimal damping coefficient in the damping adjustment model, and the damping coefficient corresponding to the voltage waveform with the smallest integral value is calculated as the optimal damping coefficient required for the receiving coil under the current environment.

[0028] As an optional implementation in this embodiment, the voltage waveform formed by the collected voltage signal includes multiple groups. In this embodiment, the control unit 300 adjusts the damping coefficient, and the signal detection unit 100 continuously and in real time collects the voltage signal output by the receiving coil 200, so as to obtain the voltage waveform formed by the voltage signal under multiple groups of damping coefficients. In a specific example, for example, the initial damping coefficient is set to 0.5, and the control unit 300 collects the voltage signal corresponding to the current damping coefficient through the signal detection unit 100, and then adjusts the damping coefficient multiple times, for example, increasing the damping coefficient by 0.1 each time until the preset damping coefficient threshold (such as 2), thereby, the control unit 300 can obtain the voltage waveform formed by the voltage signal corresponding to the multiple groups of adjusted damping coefficients.

[0029] In this embodiment, by performing differential integration on multiple groups of voltage waveforms and the ideal voltage waveform corresponding to the optimal damping coefficient, the minimum integral value indicates that the voltage waveform is closest to the optimal damping coefficient, and the damping coefficient corresponding to the voltage waveform with the minimum integral value is used to calculate the optimal damping coefficient required by the receiving coil in the current environment. Thus, the optimal matching resistance value is selected for the receiving coil, avoiding the problem of the matching resistance R m In order to solve the problem of signal distortion caused by inappropriate resistance value, which leads to oscillation or slow attenuation of the signal collected by the receiving coil, the damping coefficient of the receiving coil can be adaptively adjusted according to different detection environments and working conditions, which effectively improves the bandwidth and stability of the receiving coil for electromagnetic signals and reduces signal distortion and attenuation.

[0030] Specifically, in an application example, as an optional implementation in this embodiment, the integral formula for taking the difference between the voltage waveform formed by the collected voltage signal and the voltage waveform under the optimal damping coefficient in the damping adjustment model is:

[0031] in, represents the voltage value of the ideal voltage waveform under the optimal damping coefficient in the damping regulation model at the i-th sampling time, represents the voltage value of the voltage waveform formed by the collected voltage signal at the i-th sampling moment, n represents the number of sampling points, and f represents the sampling frequency. In this example, the current frequency and the sampling frequency of the ideal voltage waveform use the same frequency value. Of course, the method of obtaining the integral by difference provided in this application example is only an optional method as an algorithm for selecting the voltage waveform that is closest to the optimal damping coefficient, and the present invention does not limit this.

[0032] As another optional implementation in an exemplary embodiment of the present application, the control unit 300 analyzes the voltage signal according to a preset damping adjustment algorithm and a damping adjustment model in the following manner to determine the optimal damping coefficient required by the receiving coil in the current environment: The control unit 300 calculates the adjustment time ts for entering the steady state after the shutdown time according to the voltage value of the voltage signal, and compares the adjustment time ts with the optimal adjustment time TS in the damping adjustment model; If ts≤TS, the current damping coefficient is the optimal damping coefficient required by the receiving coil under the current environment; If ts>TS, the current damping coefficient is reduced by a preset value to obtain an adjusted damping coefficient, and the adjusted damping coefficient is used as the optimal damping coefficient required for the receiving coil in the current environment, and the voltage value of the voltage signal after the damping coefficient is adjusted collected by the signal detection unit 100 is continued to be received, and the adjustment time ts is recalculated according to the voltage value of the voltage signal after the damping coefficient is adjusted; if the adjustment time ts increases, the adjusted damping coefficient is increased by a preset value and used as the optimal damping coefficient required for the receiving coil in the current environment; if the adjustment time ts decreases, the adjusted damping coefficient is further reduced by a preset value and used as the adjusted damping coefficient, and the operation of using the adjusted damping coefficient as the optimal damping coefficient required for the receiving coil in the current environment and continuing to receive the voltage value of the voltage signal after the damping coefficient is adjusted collected by the signal detection unit 100 is repeated until the recalculated adjustment time ts increases, and the current damping coefficient is increased by a preset value and used as the optimal damping coefficient required for the receiving coil in the current environment.

[0033] This optional implementation is to analyze and compare the adjustment time ts corresponding to the current damping coefficient with the optimal adjustment time TS corresponding to the optimal damping coefficient, thereby determining the optimal damping coefficient required by the receiving coil under the current environment. The following explains how the control unit 300 calculates the adjustment time ts.

[0034] As an optional implementation in an exemplary embodiment of the present application, the control unit 300 calculates the adjustment time ts for entering a steady state after the shutdown time based on the voltage value of the voltage signal, including: taking a curve of the voltage value of the voltage signal entering a steady state after the shutdown time as a response curve; taking the shortest time required for the response curve to enter and remain within a steady state range as the adjustment time ts, wherein the steady state range is a reference value ± an error range, and taking the response value of the voltage value of the voltage signal entering a steady state after the shutdown time as a reference value.

[0035] Figure 3 The figure shows the relationship between the voltage value entering the steady state and the adjustment time after the shutdown time provided by an exemplary embodiment of the present application. Figure 3 As shown, the turn-off time is the turn-off time t 0 , Indicates the maximum value of the induced voltage of the receiving coil, the error range , Indicates the reference value for entering steady state, the steady state range is The adjustment time ts indicates that the induced voltage value enters and stabilizes from the maximum value In this embodiment, under the current environment, the voltage value of the voltage signal received by the control unit 300 is , the adjustment time ts is the turn-off time t 0 The shortest time required for the voltage value of the post-voltage signal to enter a steady state and remain within the steady state range.

[0036] For each damping value, the collected voltage adjustment time ts from the off time to the steady state is obtained in this way. When ts is the minimum value, it is the optimal adjustment time TS, and its corresponding damping is the optimal damping. The optimal damping in the damping adjustment model is determined based on the optimal adjustment time TS. Therefore, the optimal damping can be determined by the minimum value of the adjustment time required to enter the steady state after the off time of the voltage response curve.

[0037] In an exemplary embodiment of the present application for determining the optimal damping coefficient required by the receiving coil in the current environment, the control unit 300 compares the adjustment time ts with the optimal adjustment time TS. If ts≤TS, it means that the current adjustment time is shorter than the optimal adjustment time, and the current damping coefficient is already the optimal damping coefficient required by the receiving coil in the current environment, and no adjustment is required, and the damping coefficient remains unchanged. If ts>TS, it means that the damping coefficient of the receiving coil 200 in the current environment is not yet optimal. First, the current damping coefficient is reduced by a preset value (for example, -0.1), sent to the damping adjustment unit 400, and the matching resistance is adjusted. The control unit 300 receives the voltage value of the adjusted voltage signal collected by the signal detection unit 100 again, and calculates the adjustment time ts under the current damping coefficient. If ts increases (compared with the adjustment time calculated last time), the adjusted damping coefficient is increased by a preset value (for example, +0.1) to obtain a new damping coefficient, which is sent to the damping adjustment unit 400, and the matching resistance is adjusted to complete the damping adjustment. If ts decreases (compared with the last calculated adjustment time), the adjusted damping coefficient is further reduced by the preset value (such as -0.1) to obtain the adjusted damping coefficient, and the collected voltage signal after the damping coefficient adjustment is continued to be received. The calculated adjustment time is compared with the last adjustment time. If it is longer than the last adjustment time, it is used as the current optimal damping coefficient and the adjustment is ended. Otherwise, the damping coefficient is continued to be reduced until the adjustment time calculated by the new damping coefficient is longer than the last adjustment time, and then the adjustment is ended.

[0038] In an application example, Table 1 shows the corresponding relationship between the damping coefficient, the resistance value and the adjustment time ts.

[0039] Table 1.

[0040] In Table 1, the damping coefficient from 0.5 to 2.0 has a corresponding relationship with the resistance value and the adjustment time ts. The shorter the adjustment time is, the better the damping coefficient is. In Table 1, the optimal damping coefficient is 0.7.

[0041] In this embodiment, since the shorter the adjustment time is, the better the damping coefficient is, therefore, by analyzing and comparing the adjustment time corresponding to the current damping coefficient, the damping coefficient is adjusted to determine the optimal damping coefficient required by the receiving coil in the current environment, thereby avoiding the problem of the matching resistor R m In order to solve the problem of signal distortion caused by inappropriate resistance value, which leads to oscillation or slow attenuation of the signal collected by the receiving coil, the damping coefficient of the receiving coil can be adaptively adjusted according to different detection environments and working conditions, which effectively improves the bandwidth and stability of the receiving coil for electromagnetic signals and reduces signal distortion and attenuation.

[0042] As an optional implementation in an exemplary embodiment of the present application, Figure 2 As shown, the transient electromagnetic coil adaptive damping matching device provided in this embodiment also includes: a charging and discharging unit 600, wherein the control end of the charging and discharging unit 600 is connected to the second output end of the control unit 300, and is used to charge and discharge according to the timing pulse output by the control unit 300, and generate a pulse current to excite the target to generate a secondary field to generate a voltage signal in the receiving coil 200. Thus, the control unit 300 controls the charging and discharging of the charging and discharging unit 600, triggering the receiving coil 200 to generate a voltage signal. Specifically, the control unit 300 outputs timing pulses to the control end of the charging and discharging unit 600 according to the working timing waveform to control the charging and discharging unit 600 to charge and discharge, as shown in FIG. Figure 4 As shown, Figure 4 The working timing waveform of the control unit 300 is shown in FIG. 1 , wherein the discharge and charge pulses are used to control the charge and discharge unit to charge and discharge, the high level represents the charge and discharge duration, and the moment when the discharge ends is the shut-off moment for calculating the adjustment time. The acquisition signal pulse is used to control the signal detection unit 100 to collect the voltage value of the receiving coil, and the high level represents the acquisition duration.

[0043] As an optional implementation in an exemplary embodiment of the present application, the control unit 300 is also used to establish a damping adjustment model in the following manner: obtain the LCR parameters of the receiving coil 200; control the LCR parameters to remain unchanged, and adjust the damping coefficient by changing the resistance of the matching resistor; obtain the corresponding relationship of the transient electromagnetic response process under different damping coefficients, and establish a damping adjustment model, the damping adjustment model including: the resistance corresponding to different damping coefficients, voltage waveform data, adjustment time, and the resistance corresponding to the optimal damping coefficient, ideal voltage waveform data, and optimal adjustment time. In this embodiment, the control unit 300 performs damping adjustment tests in different environments and states in advance, adjusts the damping coefficient by changing the resistance of the matching resistor, and obtains the corresponding resistance under different damping coefficients, the collected voltage waveform data, and the corresponding adjustment time. When the adjustment time is the minimum value, the adjustment time is the optimal adjustment time, the corresponding damping is the optimal damping, and the corresponding voltage waveform data is the ideal voltage waveform data. By pre-establishing the damping adjustment model as a reference object, it is possible to dynamically adjust the damping of the receiving coil in the current environment to achieve the optimal damping state of the receiving coil in the current environment, and avoid the matching resistor R m The problem of signal distortion caused by inappropriate resistance value, which causes the signal collected by the receiving coil to oscillate or decay slowly, is solved, thereby improving the stability of the response performance of the receiving coil.

[0044] As an optional implementation in an exemplary embodiment of the present application, the damping adjustment unit 400 includes multiple groups of high-precision digital programmable potentiometers. Optionally, the programmable potentiometer is MCP4017-502, and the resistance adjustment range is 0-5kΩ.

[0045] Preferably, the damping coefficient varies in the range of 0.5 to 2. In this embodiment, the optimal damping is 0.707. As an optional implementation, the matching resistor R m and damping coefficient The relationship between them is:

[0046] Wherein, r is the DC resistance of the receiving coil 200 , L is the inductance of the receiving coil 200 , and C is the distributed capacitance of the receiving coil 200 .

[0047] Therefore, the resistance value of the matching resistor can be calculated according to the damping coefficient, and the matching resistor is adjusted by the damping adjustment unit 400 .

[0048] As an optional implementation in an exemplary embodiment of the present application, Figure 2As shown, the transient electromagnetic coil adaptive damping matching device provided in this embodiment also includes: a communication unit 700, wherein the communication unit 700 is connected to the third output terminal of the control unit 300; the communication unit 700 is used to receive the damping adjustment parameters output by the control unit 300, the collected voltage waveform data of the receiving coil and other information, and send the collected voltage waveform data of the receiving coil, the damping adjustment parameters, the working status and other information to the host computer, and can accept the host computer instructions to further optimize the damping settings.

[0049] The transient electromagnetic coil adaptive damping matching device provided in this embodiment avoids the m In order to solve the problem of signal distortion caused by inappropriate resistance value, which leads to oscillation or slow attenuation of the signal collected by the receiving coil, the damping coefficient of the receiving coil can be adaptively adjusted according to different detection environments and working conditions, which effectively improves the bandwidth and stability of the receiving coil for electromagnetic signals and reduces signal distortion and attenuation.

[0050] Figure 5 The flowchart of a transient electromagnetic coil adaptive damping matching method shown in an exemplary embodiment of the present application is shown. The method can be performed by the above-mentioned transient electromagnetic coil adaptive damping matching device. The following is only a brief description of the transient electromagnetic coil adaptive damping matching method. For other matters not covered, please refer to the relevant description of the above-mentioned transient electromagnetic coil adaptive damping matching device. Figure 5 As shown, the transient electromagnetic coil adaptive damping matching method mainly includes the following steps (S510-S540): S510, continuously collecting the voltage signal output by the receiving coil; In this embodiment, the transient electromagnetic coil adaptive damping matching device includes: a signal detection unit 100, a receiving coil 200, a control unit 300 and a damping adjustment unit 400. The signal detection unit 100 continuously and in real time collects the voltage signal output by the receiving coil 200, forms a voltage waveform, and outputs it to the control unit 300. The control unit 300 can receive a control instruction output by a control terminal, such as a computer, and receive the voltage signal output by the receiving coil 200 collected by the signal detection unit 100 within the collection time.

[0051] S520, obtaining a damping adjustment model; In this embodiment, the control unit 300 pre-establishes a damping adjustment model and stores it in the data storage unit 500. By reading the data in the data storage unit 500, the pre-stored damping adjustment model is obtained.

[0052] As an optional implementation in an exemplary embodiment of the present application, before obtaining the damping adjustment model, the method provided in this embodiment further includes: establishing the damping adjustment model. Specifically, establishing the damping adjustment model includes the following steps: Get the LCR parameters of the receiving coil; Keep the LCR parameters unchanged and adjust the damping coefficient by changing the resistance value of the matching resistor; The corresponding relationship of the transient electromagnetic response process under different damping coefficients is obtained, and a damping adjustment model is established, wherein the damping adjustment model includes: the resistance value, voltage waveform data, and adjustment time corresponding to different damping coefficients, and the resistance value, ideal voltage waveform data, and optimal adjustment time corresponding to the optimal damping coefficient.

[0053] In this embodiment, in the laboratory, a preset fixed receiving coil is selected, the LCR parameters of the receiving coil are obtained through a test instrument, and the damping adjustment test is performed in different environments and states while maintaining the same receiving coil. The damping coefficient is adjusted by changing the resistance value of the matching resistor to obtain the corresponding resistance value, the collected voltage waveform data, and the corresponding adjustment time under different damping coefficients. When the adjustment time is the minimum value, the adjustment time is the optimal adjustment time, the corresponding damping is the optimal damping, and the corresponding voltage waveform data is the ideal voltage waveform data. By pre-establishing a damping adjustment model as a reference object, it is possible to dynamically adjust the damping of the receiving coil in the current environment to achieve the optimal damping state of the receiving coil in the current environment, thereby avoiding the matching resistor R m The problem of signal distortion caused by inappropriate resistance value, which causes the signal collected by the receiving coil to oscillate or decay slowly, is solved, thereby improving the stability of the response performance of the receiving coil.

[0054] S530, analyzing the voltage signal according to a preset damping adjustment algorithm and a damping adjustment model to determine an optimal damping coefficient required by the receiving coil under the current environment; In this embodiment, two optional implementations are provided to determine the optimal damping coefficient required by the receiving coil under the current environment. The two optional implementations are explained in detail below.

[0055] Method 1, as an optional implementation in an exemplary embodiment of the present application, the voltage signal is analyzed according to a preset damping adjustment algorithm and a damping adjustment model to determine the optimal damping coefficient required for the receiving coil under the current environment, including: taking the difference between the voltage waveform formed by the collected voltage signal and the voltage waveform under the optimal damping coefficient in the damping adjustment model and integrating them, and taking the damping coefficient corresponding to the voltage waveform with the smallest integral value as the optimal damping coefficient required for the receiving coil under the current environment.

[0056] In this optional implementation, the voltage waveform formed by the collected voltage signal includes multiple groups. In this embodiment, the control unit 300 adjusts the damping coefficient, and the signal detection unit 100 continuously and in real time collects the voltage signal output by the receiving coil 200, so as to obtain the voltage waveform formed by the voltage signal under multiple groups of damping coefficients. In a specific example, for example, the initial damping coefficient is set to 0.5, and the control unit 300 collects the voltage signal corresponding to the current damping coefficient through the signal detection unit 100, and then adjusts the damping coefficient multiple times, for example, increasing the damping coefficient by 0.1 each time until the preset damping coefficient threshold (such as 2), thereby, the control unit 300 can obtain the voltage waveform formed by the voltage signal corresponding to the multiple groups of adjusted damping coefficients.

[0057] In this embodiment, by performing differential integration on multiple groups of voltage waveforms and the ideal voltage waveform corresponding to the optimal damping coefficient, the minimum integral value indicates that the voltage waveform is closest to the optimal damping coefficient, and the damping coefficient corresponding to the voltage waveform with the minimum integral value is used to calculate the optimal damping coefficient required by the receiving coil in the current environment. Thus, the optimal matching resistance value is selected for the receiving coil, avoiding the problem of the matching resistance R m In order to solve the problem of signal distortion caused by inappropriate resistance value, which leads to oscillation or slow attenuation of the signal collected by the receiving coil, the damping coefficient of the receiving coil can be adaptively adjusted according to different detection environments and working conditions, which effectively improves the bandwidth and stability of the receiving coil for electromagnetic signals and reduces signal distortion and attenuation.

[0058] Specifically, in an application example, as an optional implementation in this embodiment, the integral formula for taking the difference between the voltage waveform formed by the collected voltage signal and the voltage waveform under the optimal damping coefficient in the damping adjustment model is:

[0059] in, represents the voltage value of the ideal voltage waveform under the optimal damping coefficient in the damping regulation model at the i-th sampling time, represents the voltage value of the voltage waveform formed by the collected voltage signal at the i-th sampling moment, n represents the number of sampling points, and f represents the sampling frequency. In this example, the current frequency and the sampling frequency of the ideal voltage waveform use the same frequency value. Of course, the method of obtaining the integral by difference provided in this application example is only an optional method as an algorithm for selecting the voltage waveform that is closest to the optimal damping coefficient, and the present invention does not limit this.

[0060] Mode 2, as an optional implementation in an exemplary embodiment of the present application, analyzes the voltage signal according to a preset damping adjustment algorithm and a damping adjustment model to determine the optimal damping coefficient required by the receiving coil under the current environment, including: Calculate the regulation time ts for entering the steady state after the shutdown time according to the voltage value of the voltage signal, and compare the regulation time ts with the optimal regulation time TS in the damping regulation model; If ts≤TS, the current damping coefficient is the optimal damping coefficient required by the receiving coil under the current environment; If ts>TS, the current damping coefficient is reduced by a preset value to obtain an adjusted damping coefficient, and the adjusted damping coefficient is used as the optimal damping coefficient required for the receiving coil in the current environment, and the voltage value of the voltage signal after the damping coefficient is adjusted is continued to be received, and the adjustment time ts is recalculated according to the voltage value of the voltage signal after the damping coefficient is adjusted; if the adjustment time ts increases, the adjusted damping coefficient is increased by a preset value and used as the optimal damping coefficient required for the receiving coil in the current environment; if the adjustment time ts decreases, the adjusted damping coefficient is continued to be reduced by a preset value and used as the adjusted damping coefficient, and the operation of using the adjusted damping coefficient as the optimal damping coefficient required for the receiving coil in the current environment and continuing to receive the voltage value of the voltage signal after the damping coefficient is adjusted is repeated until the recalculated adjustment time ts increases, and the current damping coefficient is increased by a preset value and used as the optimal damping coefficient required for the receiving coil in the current environment.

[0061] In this optional implementation, the optimal damping coefficient required by the receiving coil under the current environment is determined by analyzing and comparing the adjustment time ts corresponding to the current damping coefficient with the optimal adjustment time TS corresponding to the optimal damping coefficient. Explain how the control unit 300 calculates the adjustment time ts.

[0062] As an optional implementation in an exemplary embodiment of the present application, the control unit 300 calculates the adjustment time ts for entering a steady state after the shutdown time based on the voltage value of the voltage signal, including: taking a curve of the voltage value of the voltage signal entering a steady state after the shutdown time as a response curve; taking the shortest time required for the response curve to enter and remain within a steady state range as the adjustment time ts, wherein the steady state range is a reference value ± an error range, and taking the response value of the voltage value of the voltage signal entering a steady state after the shutdown time as a reference value.

[0063] Figure 3 The figure shows the relationship between the voltage value entering the steady state and the adjustment time after the shutdown time provided by an exemplary embodiment of the present application. Figure 3 As shown, the off time is the turn-off moment, Indicates the maximum value of the induced voltage of the receiving coil 200, , Indicates the reference value for entering steady state, the steady state range is The adjustment time ts indicates that the induced voltage value enters and stabilizes from the maximum value In this embodiment, under the current environment, the voltage value of the voltage signal received by the control unit 300 is The regulation time ts is the shortest time required for the voltage value of the voltage signal to enter the steady state and remain within the steady state range after the shutdown time.

[0064] For each damping value, the collected voltage adjustment time ts from the off time to the steady state is obtained in this way. When ts is the minimum value, it is the optimal adjustment time TS, and its corresponding damping is the optimal damping. The optimal damping in the damping adjustment model is determined based on the optimal adjustment time TS. Therefore, the optimal damping can be determined by the minimum value of the adjustment time required to enter the steady state after the off time of the voltage response curve.

[0065] In an exemplary embodiment of the present application for determining the optimal damping coefficient required by the receiving coil in the current environment, the control unit 300 compares the adjustment time ts with the optimal adjustment time TS. If ts≤TS, it means that the current adjustment time is shorter than the optimal adjustment time, and the current damping coefficient is already the optimal damping coefficient required by the receiving coil in the current environment, and no adjustment is required, and the damping coefficient remains unchanged. If ts>TS, it means that the damping coefficient of the receiving coil 200 in the current environment is not yet optimal. First, the current damping coefficient is reduced by a preset value (for example, -0.1), sent to the damping adjustment unit 400, and the matching resistance is adjusted. The control unit 300 receives the voltage value of the adjusted voltage signal collected by the signal detection unit 100 again, and calculates the adjustment time ts under the current damping coefficient. If ts increases (compared with the adjustment time calculated last time), the adjusted damping coefficient is increased by a preset value (for example, +0.1) to obtain a new damping coefficient, which is sent to the damping adjustment unit 400, and the matching resistance is adjusted to complete the damping adjustment. If ts decreases (compared with the last calculated adjustment time), the adjusted damping coefficient is further reduced by the preset value (such as -0.1) to obtain the adjusted damping coefficient, and the collected voltage signal after the damping coefficient adjustment is continued to be received. The calculated adjustment time is compared with the last adjustment time. If it is longer than the last adjustment time, it is used as the current optimal damping coefficient and the adjustment is ended. Otherwise, the damping coefficient is continued to be reduced until the adjustment time calculated by the new damping coefficient is longer than the last adjustment time, and then the adjustment is ended.

[0066] In this embodiment, the shorter the adjustment time, the better the damping coefficient. Therefore, by analyzing and comparing the adjustment time corresponding to the current damping coefficient, the damping coefficient is adjusted to determine the optimal damping coefficient required by the receiving coil in the current environment, thereby avoiding the problem of the matching resistor R mIn order to solve the problem of signal distortion caused by inappropriate resistance value, which leads to oscillation or slow attenuation of the signal collected by the receiving coil, the damping coefficient of the receiving coil can be adaptively adjusted according to different detection environments and working conditions, which effectively improves the bandwidth and stability of the receiving coil for electromagnetic signals and reduces signal distortion and attenuation.

[0067] S540, adjusting the resistance value of the matching resistor according to the optimal damping coefficient.

[0068] As an optional implementation in an exemplary embodiment of the present application, the damping adjustment unit 400 includes multiple groups of high-precision digital programmable potentiometers. Optionally, the resistance adjustment range is 0-5kΩ. Preferably, the damping coefficient varies in the range of 0.5 to 2. In this embodiment, the optimal damping is 0.707. As an optional implementation, the relationship between the matching resistor Rm and the damping coefficient δ is: , where r is the DC resistance of the receiving coil 200, L is the inductance of the receiving coil 200, and C is the distributed capacitance of the receiving coil 200. Thus, the resistance value of the matching resistor can be calculated according to the damping coefficient, and the matching resistor is adjusted by the damping adjustment unit 400.

[0069] As an optional implementation in an exemplary embodiment of the present application, the transient electromagnetic coil adaptive damping matching method provided in this embodiment also includes: outputting a timing pulse to control the charge and discharge voltage 700 to charge and discharge, generating a pulse current to excite the target to generate a secondary field to generate a voltage signal in the receiving coil 200. Thus, the control unit 300 controls the charge and discharge of the charge and discharge unit 600, triggering the receiving coil 200 to generate a voltage signal.

[0070] As an optional implementation in an exemplary embodiment of the present application, the transient electromagnetic coil adaptive damping matching method provided in this embodiment also includes: sending the voltage waveform data, damping adjustment parameters, working status and other information collected from the receiving coil to the communication unit 700 to report to the host computer, so that the host computer can obtain the information of the transient electromagnetic coil adaptive damping matching device in real time.

[0071] The transient electromagnetic coil adaptive damping matching method provided in this embodiment avoids the problem of m In order to solve the problem of signal distortion caused by inappropriate resistance value, which leads to oscillation or slow attenuation of the signal collected by the receiving coil, the damping coefficient of the receiving coil can be adaptively adjusted according to different detection environments and working conditions, which effectively improves the bandwidth and stability of the receiving coil for electromagnetic signals and reduces signal distortion and attenuation.

[0072] The following is an application description of the transient electromagnetic coil adaptive damping matching method provided in this embodiment using two specific application examples.

[0073] Figure 6 FIG. 1 shows a flow chart of a transient electromagnetic coil adaptive damping matching method provided in this application example. Figure 6 As shown, the transient electromagnetic coil adaptive damping matching method includes the following steps (S610-S680): S610, system initialization, the data storage unit loads a preset damping adjustment model; S620, the signal control unit controls the charging and discharging of the charging and discharging unit according to the set working sequence, and the signal detection unit collects the induced voltage of the receiving coil in real time and transmits it to the control unit; S630, the control unit sets an initial damping coefficient to 0.5, and adjusts the damping coefficient from 0.5 to 2 with an adjustment step of 0.1 each time, and obtains a voltage waveform formed by a voltage signal collected by a signal detection unit after each adjustment of the damping coefficient; S640, reading a damping adjustment model from a data storage unit; S650: Integrate the voltage waveform formed by the collected voltage signal and the voltage waveform under the optimal damping coefficient in the damping adjustment model by subtracting the voltage waveform. The integral formula is:

[0074] in, represents the voltage value of the ideal voltage waveform under the optimal damping coefficient in the damping regulation model at the i-th sampling time, It represents the voltage value of the voltage waveform formed by the collected voltage signal at the i-th sampling moment, n represents the number of sampling points, and f represents the sampling frequency.

[0075] S660, the control unit saves the integral data and searches for the minimum integral value; the damping coefficient corresponding to the voltage waveform with the minimum integral value is calculated as the optimal damping coefficient required by the receiving coil under the current environment; the resistance value under the damping coefficient is read and sent to the damping adjustment unit; S670, the damping adjustment unit adjusts the resistance value of the matching resistor according to the resistance value under the optimal damping coefficient; S680, the communication unit regularly transmits key information such as the system's working status and damping parameters to the host computer for operators to conduct real-time monitoring and data analysis.

[0076] Figure 7 FIG. 1 shows a flow chart of a transient electromagnetic coil adaptive damping matching method provided in this application example. Figure 7 As shown, the transient electromagnetic coil adaptive damping matching method includes the following steps (S710-S790): S710, system initialization, the data storage unit loads a preset damping adjustment model; S720, the signal control unit controls the charging and discharging of the charging and discharging unit according to the set working sequence, and the signal detection unit collects the induced voltage of the receiving coil in real time and transmits it to the control unit; S730, the control unit calculates the adjustment time ts for entering the steady state after the shutdown time according to the voltage value of the voltage signal; S740, reading the damping adjustment model of the data storage unit, comparing the adjustment time ts with the optimal adjustment time TS in the damping adjustment model, if ts≤TS, the current damping coefficient is the optimal damping coefficient required by the receiving coil under the current environment, and executing step S770; if ts>TS, executing step S750; S750, reducing the current damping coefficient by 0.1, and continuing to collect the voltage value of the voltage signal after the damping coefficient is adjusted; S760, recalculate the adjustment time ts according to the voltage value of the voltage signal after the damping coefficient is adjusted, and judge the adjustment time ts. If the adjustment time ts increases, the new damping coefficient after the current damping coefficient + 0.1 is used as the optimal damping coefficient required by the receiving coil under the current environment, and execute step S770; otherwise, return to step S750; S770, reading the resistance value of the receiving coil under the optimal damping coefficient required by the current environment, and sending it to the damping adjustment unit; S780, the damping adjustment unit adjusts the resistance value of the matching resistor according to the resistance value under the optimal damping coefficient; S790, the communication unit regularly transmits key information such as the system's working status and damping parameters to the host computer for operators to conduct real-time monitoring and data analysis.

[0077] The transient electromagnetic coil adaptive damping matching method provided in this embodiment avoids the problem of m In order to solve the problem of signal distortion caused by inappropriate resistance value, which leads to oscillation or slow attenuation of the signal collected by the receiving coil, the damping coefficient of the receiving coil can be adaptively adjusted according to different detection environments and working conditions, which effectively improves the bandwidth and stability of the receiving coil for electromagnetic signals and reduces signal distortion and attenuation.

[0078] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the claims.

[0079] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A transient electromagnetic coil adaptive damping matching device, characterized in that: include: A signal detection unit (100), a receiving coil (200), a control unit (300) and a damping adjustment unit (400); wherein: The first end of the signal detection unit (100) is connected to the first output end of the receiving coil (200), the second end of the signal detection unit (100) is connected to the second output end of the receiving coil (200), and the third end of the signal detection unit (100) is connected to the first input end of the control unit (300); The first output end of the control unit (300) is connected to the control end of the damping adjustment unit (400); The first end of the damping adjustment unit (400) is connected to the first output end of the receiving coil (200), and the second end of the damping adjustment unit (400) is connected to the second output end of the receiving coil (200); The signal detection unit (100) is used to continuously collect the voltage signal output by the receiving coil (200) and transmit it to the control unit (300); The control unit (300) is used to receive the voltage signal, obtain a damping adjustment model, and analyze the voltage signal according to a preset damping adjustment algorithm and the damping adjustment model, determine the optimal damping coefficient required by the receiving coil under the current environment, and send it to the damping adjustment unit (400); The damping adjustment unit (400) is used to adjust the resistance value of the matching resistor according to the optimal damping coefficient.

2. The device according to claim 1, characterized in that The control unit (300) analyzes the voltage signal according to a preset damping adjustment algorithm and the damping adjustment model in the following manner to determine the optimal damping coefficient required by the receiving coil under the current environment: The voltage waveform formed by the collected voltage signal is differentiated from the voltage waveform under the optimal damping coefficient in the damping adjustment model to obtain the integral, and the damping coefficient corresponding to the voltage waveform with the smallest integral value is calculated as the optimal damping coefficient required by the receiving coil under the current environment.

3. The device according to claim 2, characterized in that The integral formula for obtaining the integral by taking the difference between the voltage waveform formed by the collected voltage signal and the voltage waveform under the optimal damping coefficient in the damping adjustment model is: in, represents the voltage value of the voltage waveform at the i-th sampling time under the optimal damping coefficient in the damping adjustment model, represents the voltage value of the voltage waveform formed by the collected voltage signal at the i-th sampling moment, n represents the number of sampling points, and f represents the sampling rate.

4. The device according to claim 1, characterized in that The control unit (300) analyzes the voltage signal according to a preset damping adjustment algorithm and the damping adjustment model in the following manner to determine the optimal damping coefficient required by the receiving coil under the current environment: The control unit (300) calculates a regulation time ts for entering a steady state after the shutdown time according to the voltage value of the voltage signal, and compares the regulation time ts with an optimal regulation time TS in the damping regulation model; If ts≤TS, the current damping coefficient is the optimal damping coefficient required by the receiving coil under the current environment; If ts>TS, the current damping coefficient is reduced by a preset value to obtain an adjusted damping coefficient, the adjusted damping coefficient is used as the optimal damping coefficient required by the receiving coil under the current environment, and the voltage value of the voltage signal after the damping coefficient is adjusted collected by the signal detection unit (100) is continuously received, and the adjustment time ts is recalculated according to the voltage value of the voltage signal after the damping coefficient is adjusted; If the adjustment time ts increases, the adjusted damping coefficient is increased by the preset value and used as the optimal damping coefficient required by the receiving coil in the current environment; if the adjustment time ts decreases, the adjusted damping coefficient is further reduced by the preset value and used as the adjusted damping coefficient, and the operation of using the adjusted damping coefficient as the optimal damping coefficient required by the receiving coil in the current environment is repeated, and the voltage value of the voltage signal after the damping coefficient is adjusted collected by the signal detection unit (100) is continuously received, until the recalculated adjustment time ts increases, and the current damping coefficient is increased by the preset value and used as the optimal damping coefficient required by the receiving coil in the current environment.

5. The device according to claim 1, characterized in that The control unit (300) calculates the adjustment time ts for entering a steady state after the shutdown time according to the voltage value of the voltage signal in the following manner: A curve in which the voltage value of the voltage signal enters a steady state after the off time is used as a response curve; The shortest time required for the response curve to enter and remain in a steady-state range is taken as the adjustment time ts, wherein the steady-state range is the reference value±error range, and the response value of the voltage signal after the shutdown time to enter a steady state is taken as the reference value.

6. The device according to claim 1, characterized in that The control unit (300) is further used to establish the damping adjustment model in the following manner: Obtaining LCR parameters of the receiving coil (200); The LCR parameter is controlled to remain unchanged, and the damping coefficient is adjusted by changing the resistance value of the matching resistor; The corresponding relationship of the transient electromagnetic response process under different damping coefficients is obtained, and the damping adjustment model is established. The damping adjustment model includes: the resistance value, voltage waveform data, and adjustment time corresponding to different damping coefficients, and the resistance value, ideal voltage waveform data, and optimal adjustment time corresponding to the optimal damping coefficient.

7. The device according to claim 1, characterized in that Also includes: Charge and discharge unit (600), The control end of the charging and discharging unit (600) is connected to the second output end of the control unit (300) and is used to charge and discharge according to the timing pulse output by the control unit (300), thereby generating a pulse current to excite the target to generate a secondary field and generate the voltage signal in the receiving coil (200).

8. A transient electromagnetic coil adaptive damping matching method, applied to a transient electromagnetic coil adaptive damping matching device as claimed in any one of claims 1 to 7, characterized in that: include: Continuously collect the voltage signal output by the receiving coil; Obtaining a damping adjustment model; Analyzing the voltage signal according to a preset damping adjustment algorithm and the damping adjustment model to determine an optimal damping coefficient required by the receiving coil under the current environment; The resistance value of the matching resistor is adjusted according to the optimal damping coefficient.

9. The method according to claim 8, characterized in that The analyzing the voltage signal according to the preset damping adjustment algorithm and the damping adjustment model to determine the optimal damping coefficient required by the receiving coil under the current environment includes: The voltage waveform formed by the collected voltage signal is differentiated from the voltage waveform under the optimal damping coefficient in the damping adjustment model to obtain the integral, and the damping coefficient corresponding to the voltage waveform with the smallest integral value is calculated as the optimal damping coefficient required by the receiving coil under the current environment.

10. The method according to claim 8, characterized in that The analyzing the voltage signal according to the preset damping adjustment algorithm and the damping adjustment model to determine the optimal damping coefficient required by the receiving coil under the current environment includes: Calculating a regulation time ts for entering a steady state after the shutdown time according to the voltage value of the voltage signal, and comparing the regulation time ts with an optimal regulation time TS in the damping regulation model; If ts≤TS, the current damping coefficient is the optimal damping coefficient required by the receiving coil under the current environment; If ts>TS, the current damping coefficient is reduced by a preset value to obtain an adjusted damping coefficient, and the adjusted damping coefficient is used as the optimal damping coefficient required by the receiving coil in the current environment, and the voltage value of the voltage signal after the damping coefficient is adjusted is continuously received, and the adjustment time ts is recalculated according to the voltage value of the voltage signal after the damping coefficient is adjusted; if the adjustment time ts increases, the adjusted damping coefficient is increased by the preset value and used as the optimal damping coefficient required by the receiving coil in the current environment; if the adjustment time ts decreases, the adjusted damping coefficient is continuously reduced by the preset value and used as the adjusted damping coefficient, and the operation of using the adjusted damping coefficient as the optimal damping coefficient required by the receiving coil in the current environment and continuing to receive the voltage value of the voltage signal after the damping coefficient is adjusted is repeated until the recalculated adjustment time ts increases, and the current damping coefficient is increased by the preset value and used as the optimal damping coefficient required by the receiving coil in the current environment.

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