A transient electromagnetic coil adaptive damping matching device and method

Abstract

The application discloses a transient electromagnetic coil adaptive damping matching device and method, and belongs to the technical field of electromagnetic detection. The device comprises 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 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 signals, analyzes the voltage signals according to a preset damping adjustment algorithm and a damping adjustment model, determines the optimal damping coefficient required by the receiving coil under the current environment, and sends the optimal damping coefficient to the damping adjustment unit 400. The damping adjustment unit 400 adjusts the resistance value of the matching resistor according to the optimal damping coefficient. The application can avoid the problems of signal distortion, oscillation or slow attenuation of signals collected by the receiving coil due to the unsuitable resistance value of the matching resistor, and improves the stability of the response performance of the receiving coil.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of electromagnetic detection, in particular to a transient electromagnetic coil adaptive damping matching device and method. BACKGROUND

[0002] The transient electromagnetic method is an effective means for urban underground space detection and imaging, has the characteristics of sensitivity to low resistance body, strong anti-interference ability, large exploration depth, etc., and can be applied to underground pipeline detection, urban geological disaster investigation, engineering geological survey and the like.

[0003] The receiving coil sensor is a key core module for receiving transient electromagnetic signals, and can be equivalent to a typical second-order system, as shown in the formula (1). Figure 1 The damping coefficient of the receiving coil is an important parameter of the sensor. The directly wound hollow coil is in an under-damped state, and when receiving high-frequency signals, it will produce time-domain oscillation. It is necessary to adjust the damping coefficient of the coil by connecting a matching resistor R m between the two ends of the receiving coil to improve the oscillation phenomenon of the coil. The value of the matching resistor R m is not appropriate, which will produce signal distortion, resulting in oscillation or slow attenuation of the signal collected by the receiving coil, and affecting the analysis of the secondary field signal.

[0004] In addition, the traditional receiving coil damping is usually fixedly set and cannot adapt to changes in different geological conditions, detection depths and electromagnetic environments, resulting in unstable response performance of the receiving coil, easy signal distortion, too fast attenuation and the like, thereby seriously affecting the accuracy and reliability of the electromagnetic detection. SUMMARY

[0005] The embodiment of the present application provides a transient electromagnetic coil adaptive damping matching device and method, and 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 the problem that the value of the matching resistor R m is not appropriate, which will produce signal distortion, resulting in oscillation or slow attenuation of the signal collected by the receiving coil, and affecting the analysis of the secondary field signal.

[0006] In order to solve the above technical problems, the present application is realized as follows:

[0007] 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:

[0008] 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;

[0009] The first output end of the control unit 300 is connected to the control end of the damping adjustment unit 400.

[0010] 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.

[0011] The signal detection unit 100 is used for continuously collecting the voltage signal output by the receiving coil 200 and transmitting to the control unit 300.

[0012] The control unit 300 is used for receiving the voltage signal, obtaining a damping adjustment model, and analyzing 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 and send to the damping adjustment unit 400.

[0013] The damping adjustment unit 400 is used for adjusting the resistance value of the matching resistance according to the optimal damping coefficient.

[0014] Optionally, the control unit 300 analyzes 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 in the current environment by the following way:

[0015] Subtracting the voltage waveform formed by the collected voltage signal from the voltage waveform under the optimal damping coefficient in the damping adjustment model to integrate, and taking the damping coefficient corresponding to the voltage waveform with the minimum integral value as the optimal damping coefficient required by the receiving coil in the current environment.

[0016] Optionally, the integral formula of subtracting the voltage waveform formed by the collected voltage signal from the voltage waveform under the optimal damping coefficient in the damping adjustment model to integrate is:

[0017]

[0018] Wherein represents the voltage value of the voltage waveform under the optimal damping coefficient in the damping adjustment 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 time, n represents the number of sampling points, and f represents the sampling rate.

[0019] Optionally, the control unit 300 analyzes 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 in the current environment in the following manner:

[0020] The control unit 300 calculates the adjustment time ts of entering the steady state after the turn-off time according to the voltage value of the voltage signal, compares the adjustment time ts with the optimal adjustment time TS in the damping adjustment model.

[0021] If ts≤TS, the current damping coefficient is the optimal damping coefficient required by the receiving coil in the current environment.

[0022] If ts>TS, the current damping coefficient is reduced by a preset value to obtain an adjusted damping coefficient, the adjusted damping coefficient is taken as the optimal damping coefficient required by the receiving coil in the current environment, and the voltage value of the voltage signal adjusted in damping coefficient collected by the signal detection unit 100 is continuously received, and the voltage value of the voltage signal adjusted in damping coefficient is recalculated according to the voltage value of the voltage signal adjusted in damping coefficient. The adjustment time ts is increased, the adjusted damping coefficient is increased by the preset value and taken as the optimal damping coefficient required by the receiving coil in the current environment, if the adjustment time ts is reduced, the adjusted damping coefficient is continuously reduced by the preset value and taken as the adjusted damping coefficient, the operation of taking the adjusted damping coefficient as the optimal damping coefficient required by the receiving coil in the current environment and continuously receiving the voltage value of the voltage signal adjusted in damping coefficient collected by the signal detection unit 100 is repeatedly executed until the recalculated adjustment time ts is increased, and the current damping coefficient is increased by the preset value and taken as the optimal damping coefficient required by the receiving coil in the current environment.

[0023] Optionally, the control unit 300 calculates the adjustment time ts of entering the steady state after the turn-off time according to the voltage value of the voltage signal in the following manner:

[0024] The curve of the voltage value of the voltage signal entering the steady state after the turn-off time is taken as a response curve.

[0025] The shortest time required for the response curve to enter and remain in the steady state range is taken as the adjustment time ts, wherein the steady state range is a reference value ± error range, and the response value of the voltage value of the voltage signal entering the steady state after the turn-off time is taken as the reference value.

[0026] Optionally, the control unit 300 is further configured to establish the damping adjustment model in the following manner:

[0027] Obtaining inductance capacitance resistance LCR parameters of the receiving coil 200;

[0028] Controlling the LCR parameters unchanged, adjusting the damping coefficient by changing the resistance value of the matching resistance;

[0029] Obtaining the transient electromagnetic response process corresponding relationship under different damping coefficients, establishing the damping adjustment model, the damping adjustment model includes: the resistance value corresponding to different damping coefficients, voltage waveform data, adjustment time and the resistance value corresponding to the optimal damping coefficient, ideal voltage waveform data, optimal adjustment time.

[0030] Optionally, the device further comprises a charging and discharging unit 600,

[0031] The control end of the charging and discharging unit 600 is connected with the second output end of the control unit 300, for charging and discharging according to the time sequence pulse output by the control unit 300, generating a pulse current to excite the target to generate a secondary field in the receiving coil 200 to generate the voltage signal.

[0032] In a second aspect, a transient electromagnetic coil adaptive damping matching method is provided, applied to the transient electromagnetic coil adaptive damping matching device as described above, comprising:

[0033] Continuously collecting the voltage signal output by the receiving coil;

[0034] Obtaining a damping adjustment model;

[0035] According to the preset damping adjustment algorithm and the damping adjustment model, the voltage signal is analyzed to determine the optimal damping coefficient required by the receiving coil in the current environment;

[0036] According to the optimal damping coefficient, the resistance value of the matching resistance is adjusted.

[0037] Optionally, the analysis of 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 in the current environment comprises:

[0038] The voltage waveform formed by the collected voltage signal is subtracted from the voltage waveform under the optimal damping coefficient in the damping adjustment model to obtain the integral value, and the damping coefficient corresponding to the voltage waveform with the minimum integral value is taken as the optimal damping coefficient required by the receiving coil in the current environment.

[0039] Optionally, the analysis of 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 in the current environment comprises:

[0040] Calculate a regulation time ts of entering a steady state after the turn-off time according to a voltage value of the voltage signal, compare the regulation time ts with an optimal regulation time TS in the damping regulation model;

[0041] If ts≤TS, the current damping coefficient is the optimal damping coefficient required by the receiving coil in the current environment;

[0042] If ts>TS, decrease the current damping coefficient by a preset value to obtain an adjusted damping coefficient, take the adjusted damping coefficient as the optimal damping coefficient required by the receiving coil in the current environment, continue to receive the voltage value of the voltage signal adjusted by the damping coefficient, and recalculate the regulation time ts according to the voltage value of the voltage signal adjusted by the damping coefficient; if the regulation time ts increases, increase the adjusted damping coefficient by the preset value to obtain the optimal damping coefficient required by the receiving coil in the current environment, if the regulation time ts decreases, continue to decrease the adjusted damping coefficient by the preset value to obtain the adjusted damping coefficient, repeat the operation of taking 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 adjusted by the damping coefficient until the regulation time ts obtained by recalculation increases, and increase the current damping coefficient by the preset value to obtain the optimal damping coefficient required by the receiving coil in the current environment.

[0043] The technical scheme provided in the application can have the following beneficial effects:

[0044] The transient electromagnetic coil self-adaptive damping matching device and method provided by the embodiment of the application avoid signal distortion caused by improper resistance value of the matching resistor, and influence on analysis of secondary field signals caused by oscillation or slow attenuation of signals collected by the receiving coil. The damping coefficient of the receiving coil can be self-adaptively adjusted according to different detection environments and working conditions, the bandwidth and stability of the receiving coil for electromagnetic signals are effectively improved, and signal distortion and attenuation are reduced.

[0045] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the application. BRIEF DESCRIPTION OF DRAWINGS

[0046] The accompanying drawings incorporated in the specification and constituting a part of the specification illustrate embodiments consistent with the application and serve to explain the principles of the application together with the specification.

[0047] Figure 1 An equivalent circuit diagram of a coil sensor connected with a damping matching resistor in the prior art is shown;

[0048] Figure 2 Fig. 1 shows a structural schematic diagram of a transient electromagnetic coil adaptive damping matching device according to an example embodiment of the present application;

[0049] Figure 3 Fig. 4 shows a relationship between a steady state voltage value after a turn-off time and a regulation time according to an example embodiment of the present application;

[0050] Figure 4 Fig. 5 shows a working timing waveform schematic diagram of a control unit 300 according to an example embodiment of the present application;

[0051] Figure 5 Fig. 6 shows a flow chart of a transient electromagnetic coil adaptive damping matching method according to an example embodiment of the present application;

[0052] Figure 6 Fig. 7 shows a flow chart of a transient electromagnetic coil adaptive damping matching method according to an example application of the present application;

[0053] Figure 7 Fig. 8 shows a flow chart of a transient electromagnetic coil adaptive damping matching method according to an example application of the present application. DETAILED DESCRIPTION

[0054] The example embodiments will be described in detail herein with reference to the drawings. When the following description refers to arrangements in the drawings, identical numbers on different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following example embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples consistent with some aspects of the present application as detailed in the appended claims.

[0055] Figure 2 Fig. 1 shows a structural schematic diagram of a transient electromagnetic coil adaptive damping matching device according to an example embodiment of the present application.

[0056] As Figure 2As shown in the exemplary embodiment of this application, an adaptive damping matching device 10 for transient electromagnetic coils includes: 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, and a third end of the signal detection unit 100 is connected to a 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... The first output terminal of the receiving coil 200 is connected, and the second terminal of the damping adjustment unit 400 is connected to the second output terminal of the receiving coil 200; the signal detection unit 100 is used to continuously acquire 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, acquire the damping adjustment model, and analyze the voltage signal according to the preset damping adjustment algorithm and 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.

[0057] In this embodiment, the signal detection unit 100 continuously and in real-time acquires the voltage signal output by the receiving coil 200, forming a voltage waveform. The control unit 300 compares and analyzes these voltage waveforms with the data in the damping adjustment model to determine the optimal damping coefficient required by the receiving coil under the current environment in real time, thereby avoiding the problem caused by the matching resistor R. m The problem of signal distortion caused by an unsuitable resistance value, resulting in oscillation or slow attenuation of the signal collected by the receiving coil, can be solved by adaptively adjusting the damping coefficient of the receiving coil according to different detection environments and operating conditions. This effectively improves the bandwidth and stability of the receiving coil for electromagnetic signals and reduces signal distortion and attenuation.

[0058] Understandably, in this embodiment, the control unit 300 can receive control commands output by a control terminal, such as a computer. The control unit 300 generates corresponding control signals according to the control commands and sends them to the control terminal of the damping adjustment unit 400 through the output terminal.

[0059] As an optional implementation method in an exemplary embodiment of this application, such as Figure 2As shown, the transient electromagnetic coil adaptive damping matching device provided by an example embodiment of the present application further comprises a data storage unit 500, wherein the input and output ends of the data storage unit 500 are connected with the second input end of the control unit 300, and the data storage unit 500 is configured to store a pre-established damping adjustment model, which is the data obtained by the control unit 300 in different test environments and conditions, and the damping adjustment model comprises: the resistance value corresponding to different damping coefficients, voltage waveform data, adjustment time, and the resistance value corresponding to the optimal damping coefficient, ideal voltage waveform data, and optimal adjustment time. In addition, the data storage unit 500 is further configured to store historical detection data and damping adjustment records for the control unit 300 to query and call. The storage and analysis of the historical data and the damping adjustment records by the data storage unit are adaptive and expandable, and can better adapt to complex urban environments.

[0060] Specifically, as an optional implementation in an example embodiment of the present application, the control unit 300 analyzes the voltage signal according to the preset damping adjustment algorithm and damping adjustment model in the following manner to determine the optimal damping coefficient required by the receiving coil in the current environment: the voltage waveform formed by the collected voltage signal is subtracted from the voltage waveform under the optimal damping coefficient to obtain an integral value, and the damping coefficient corresponding to the voltage waveform with the minimum integral value is taken as the optimal damping coefficient required by the receiving coil in the current environment.

[0061] As an optional implementation in the present embodiment, the voltage waveform formed by the collected voltage signal comprises multiple groups. In the present embodiment, the control unit 300 can obtain the voltage waveform formed by the voltage signal under multiple damping coefficients by continuously and real-timely collecting the voltage signal output by the receiving coil 200 through the signal detection unit 100 by adjusting the damping coefficient. In a specific example, for example, the initial damping coefficient is set to 0.5, 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, increases the damping coefficient by 0.1 each time until a preset damping coefficient threshold (such as 2), thereby the control unit 300 can obtain the voltage waveform formed by the voltage signal corresponding to multiple adjusted damping coefficients.

[0062] In the present embodiment, by subtracting the multiple voltage waveforms from the ideal voltage waveform corresponding to the optimal damping coefficient, the minimum integral value indicates that the optimal damping coefficient is closest, and the damping coefficient corresponding to the voltage waveform used to calculate the minimum integral value is taken as the optimal damping coefficient required by the receiving coil in the current environment, thereby the optimal matching resistance value is selected for the receiving coil, and the problem that the matching resistance R mThe signal distortion caused by the improper resistance of the receiving coil, the oscillation of the signal collected by the receiving coil and the slow attenuation of the signal can be solved by adaptively adjusting the damping coefficient of the receiving coil 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.

[0063] Specifically, in one application example, as an optional implementation in the embodiment, the integral formula of the integral of 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:

[0064]

[0065] wherein, represents the voltage value of the ideal voltage waveform under the optimal damping coefficient in the damping adjustment 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 time, n represents the number of sampling points, and f represents the sampling frequency. In the example, the current sampling frequency and the sampling frequency of the ideal voltage waveform use the same frequency value. Of course, the way of integrating by difference provided in the application example is only an optional way to select the voltage waveform closest to the voltage waveform under the optimal damping coefficient, and the present application is not limited thereto.

[0066] As another optional implementation in the example embodiment of the present application, the control unit 300 analyzes the voltage signal according to the preset damping adjustment algorithm and damping adjustment model to determine the optimal damping coefficient required by the receiving coil in the current environment in the following way:

[0067] The control unit 300 compares the adjustment time ts of the voltage signal entering the steady state after the off time is calculated with the optimal adjustment time TS in the damping adjustment model;

[0068] If ts≤TS, the current damping coefficient is the optimal damping coefficient required by the receiving coil in the current environment;

[0069] If ts>TS, the current damping coefficient is reduced by a preset value to obtain an adjusted damping coefficient, the adjusted damping coefficient is taken as the optimal damping coefficient required by the receiving coil in the current environment, and the voltage value of the voltage signal with the adjusted damping coefficient collected by the receiving signal detection unit 100 is continuously received, and the adjustment time ts is recalculated according to the voltage value of the voltage signal with the adjusted damping coefficient; if the adjustment time ts increases, the adjusted damping coefficient is increased by a preset value to obtain 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 a preset value to obtain the adjusted damping coefficient, the operation of taking the adjusted damping coefficient as the optimal damping coefficient required by the receiving coil in the current environment and continuously receiving the voltage value of the voltage signal with the adjusted damping coefficient collected by the receiving signal detection unit 100 is repeatedly performed until the recalculated adjustment time ts increases, and the current damping coefficient is increased by a preset value to obtain the optimal damping coefficient required by the receiving coil in the current environment.

[0070] The optional embodiment is to determine the optimal damping coefficient required by the receiving coil in the current environment by comparing and analyzing the adjustment time ts corresponding to the current damping coefficient and the optimal adjustment time TS corresponding to the optimal damping coefficient. The following explains how the control unit 300 calculates the adjustment time ts.

[0071] As an optional embodiment in the example embodiment of the present application, the control unit 300 calculates the adjustment time ts of the voltage signal entering the steady state after the turn-off time, including: taking the curve of the voltage value of the voltage signal entering the steady state after the turn-off time as a response curve; taking the shortest time required for the response curve to enter and remain in the steady state range as the adjustment time ts, wherein the steady state range is the reference value ± error range, and the response value of the voltage value of the voltage signal entering the steady state after the turn-off time is taken as the reference value.

[0072] Figure 3 The relationship between the voltage value entering the steady state after the turn-off time and the adjustment time is shown in the schematic diagram of the example embodiment of the present application. As shown in Figure 3 , the turn-off time is the turn-off time t0, , the maximum value of the receiving coil induced voltage, the error range , , the reference value entering the steady state, the steady state range is , the adjustment time ts represents the shortest time for the induced voltage value to enter and stabilize in . In the embodiment, the voltage value of the voltage signal received by the control unit 300 in the current environment is , and the adjustment time ts is the shortest time required for the voltage value of the voltage signal to enter the steady state and remain in the steady state range after the turn-off time t0.

[0073] For each damping value, the adjustment time ts of the collected voltage 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 the corresponding damping is the optimal damping. The optimal damping in the damping adjustment model is determined according to the optimal adjustment time TS. Therefore, the optimal damping can be determined by the minimum value of the adjustment time of the voltage response curve from the off time to the steady state.

[0074] In the above-described example 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 needed, 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 optimal, the current damping coefficient is first reduced by a preset value (for example, -0.1), and is sent to the damping adjustment unit 400 to adjust the matching resistance. 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 to adjust the matching resistance, and the damping adjustment is completed. If ts decreases (compared with the adjustment time calculated last time), the adjusted damping coefficient is continuously reduced by a preset value (for example, -0.1) to obtain an adjusted damping coefficient, and the collected voltage signal after the damping coefficient adjustment is continuously received, and the calculated adjustment time is compared with the adjustment time last time, if it is larger than the adjustment time last time, it is taken as the current optimal damping coefficient, and the adjustment is ended, otherwise, the damping coefficient is continuously reduced until the adjustment time calculated by the new damping coefficient is larger than the adjustment time last time, and the adjustment is ended.

[0075] In an application example, Table 1 shows the correspondence between the damping coefficient, the resistance value and the adjustment time ts.

[0076] Table 1.

[0077]

[0078] 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, the better the damping coefficient, and the optimal damping coefficient in Table 1 is 0.7.

[0079] In the embodiment, since the adjustment time is short, the better the damping coefficient is, and thus the damping coefficient is adjusted to determine the optimal damping coefficient required by the receiving coil in the current environment through analysis and comparison of the adjustment time corresponding to the current damping coefficient, thereby avoiding the problems of signal distortion, oscillation or slow attenuation of the signal collected by the receiving coil due to the inappropriate resistance value of the matching resistor R m The adaptive damping matching device for transient electromagnetic coil can adaptively adjust the damping coefficient of the receiving coil according to different detection environments and working conditions, effectively improves the bandwidth and stability of the receiving coil to the electromagnetic signal, and reduces signal distortion and attenuation.

[0080] As an optional implementation manner of the exemplary embodiment of the present application, as shown in Figure 2 The adaptive damping matching device for transient electromagnetic coil further comprises a charging and discharging unit 600, wherein the control end of the charging and discharging unit 600 is connected with the second output end of the control unit 300, and the charging and discharging unit 600 is used to charge and discharge according to the time sequence pulse output by the control unit 300 to generate a pulse current to excite the target to generate a secondary field and 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 to trigger the receiving coil 200 to generate a voltage signal. Specifically, the control unit 300 outputs a time sequence pulse to the control end of the charging and discharging unit 600 according to the working time sequence waveform to control the charging and discharging of the charging and discharging unit 600, as shown in Figure 4 Figure 4 The working time sequence waveform of the control unit 300 is shown in FIG. 6, wherein the discharging and charging pulse is used to control the charging and discharging of the charging and discharging unit, the high level represents the charging and discharging time, and the moment when the discharging ends is the off moment for calculating the adjustment time. The acquisition signal pulse is used to control the signal detection unit 100 to acquire the voltage value of the receiving coil, and the high level represents the acquisition time.

[0081] ​As an optional implementation of the example embodiment of the present application, the control unit 300 is further configured to establish the damping adjustment model by: obtaining the LCR parameters of the receiving coil 200; controlling the LCR parameters to be constant, adjusting the damping coefficient by changing the resistance value of the matching resistor; obtaining the transient electromagnetic response process corresponding relationship under different damping coefficients, and establishing the damping adjustment model, which includes: the resistance value corresponding to different damping coefficients, the voltage waveform data, the adjustment time, and the resistance value corresponding to the optimal damping coefficient, the ideal voltage waveform data, and the 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 value of the matching resistor, and obtains the resistance value corresponding to 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 establishing the damping adjustment model in advance as a reference object, the damping of the receiving coil in the current environment can be dynamically adjusted to achieve the optimal damping state of the receiving coil in the current environment, avoiding the problems of signal distortion, causing the received signal of the receiving coil to oscillate or slow down, and improving the stability of the response performance of the receiving coil. m

[0082] As an optional implementation of the example 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.

[0083] Preferably, the change range of the damping coefficient is 0.5 to 2. In this embodiment, the optimal damping is 0.707. As an optional implementation, the relationship between the matching resistor R m and the damping coefficient is:

[0084] Wherein, r is the direct current 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.

[0085] 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.

[0086] As an optional implementation of the example embodiment of the present application, as shown in FIG. 4, the damping adjustment unit 400 includes a plurality of groups of high-precision digital programmable potentiometers. Figure 2 ​As shown, the transient electromagnetic coil adaptive damping matching device provided by the embodiment further comprises a communication unit 700, wherein the communication unit 700 is connected with the third output end of the control unit 300; the communication unit 700 is used for receiving the damping adjustment parameter, the voltage waveform data of the received coil collected and other information output by the control unit 300, sending the voltage waveform data of the received coil collected, the damping adjustment parameter, the working state and other information to the upper computer, and simultaneously accepting the instruction of the upper computer to further optimize the damping setting.

[0087] By the transient electromagnetic coil adaptive damping matching device provided by the embodiment, the problems that signal distortion is caused due to the unsuitable resistance value of the matching resistor R m , the signal collected by the received coil is oscillated or attenuated slowly, and the like can be avoided; the damping coefficient of the received coil can be adaptively adjusted according to different detection environments and working conditions; the bandwidth and stability of the received coil to the electromagnetic signal are effectively improved; and the signal distortion and attenuation are reduced.

[0088] Figure 5 A flow chart of a transient electromagnetic coil adaptive damping matching method according to an example embodiment of the present application is shown, and the method can be executed by the transient electromagnetic coil adaptive damping matching device described above. The transient electromagnetic coil adaptive damping matching method will be briefly described below, and other details can be referred to the related description of the transient electromagnetic coil adaptive damping matching device described above. As shown in the flow chart, Figure 5 the transient electromagnetic coil adaptive damping matching method mainly comprises the following steps (S510-S540):

[0089] S510, continuously collecting the voltage signal output by the received coil;

[0090] In the embodiment, the transient electromagnetic coil adaptive damping matching device comprises a signal detection unit 100, a received coil 200, a control unit 300 and a damping adjustment unit 400. The signal detection unit 100 continuously and real-timely collects the voltage signal output by the received coil 200, forms a voltage waveform and outputs to the control unit 300. The control unit 300 can receive the control instruction output by a control terminal such as a computer, and receive the voltage signal output by the received coil 200 collected by the signal detection unit 100 within the collection time.

[0091] S520, obtaining a damping adjustment model;

[0092] In the embodiment, the control unit 300 pre-establishes a damping adjustment model and stores the damping adjustment model in a data storage unit 500. The pre-stored damping adjustment model is obtained by reading the data in the data storage unit 500.

[0093] As an optional implementation of an exemplary embodiment of the present application, before the damping adjustment model is acquired, the method provided by the embodiment further includes: establishing the damping adjustment model, and specifically, the establishing of the damping adjustment model includes the following steps:

[0094] acquiring the LCR parameters of the receiving coil;

[0095] controlling the LCR parameters to be unchanged, and adjusting the damping coefficient by changing the resistance value of the matching resistor;

[0096] acquiring the correspondence between the transient electromagnetic response process under different damping coefficients, and establishing the damping adjustment model, wherein the damping adjustment model includes: the resistance value corresponding to different damping coefficients, the voltage waveform data, the adjustment time, and the resistance value corresponding to the optimal damping coefficient, the ideal voltage waveform data, and the optimal adjustment time.

[0097] In the embodiment, in the laboratory, the LCR parameters of a preset fixed receiving coil are acquired by a testing instrument, the damping adjustment test is performed under different environments and states while the condition of the same receiving coil is maintained, the damping coefficient is adjusted by changing the resistance value of the matching resistor, and the resistance value corresponding to different damping coefficients, the collected voltage waveform data, and the corresponding adjustment time are obtained. 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 establishing the damping adjustment model in advance as a reference object, the damping of the receiving coil under the current environment can be dynamically adjusted to achieve the optimal damping state of the receiving coil under the current environment, and the problem of signal distortion, oscillation or slow attenuation of the signal collected by the receiving coil due to the inappropriate resistance value of the matching resistor R m is avoided, and the stability of the response performance of the receiving coil is improved.

[0098] S530, 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;

[0099] In the embodiment, two optional implementation manners are provided to determine the optimal damping coefficient required by the receiving coil under the current environment. The two optional implementation manners are explained in detail as follows.

[0100] As an optional implementation of an exemplary embodiment of the present application, the optimal damping coefficient required by the receiving coil under the current environment is determined by analyzing the voltage signal according to the preset damping adjustment algorithm and the damping adjustment model, and the method includes: subtracting the voltage waveform formed by the collected voltage signal from the voltage waveform under the optimal damping coefficient in the damping adjustment model to obtain the integral value, and taking the damping coefficient corresponding to the voltage waveform with the minimum integral value as the optimal damping coefficient required by the receiving coil under the current environment.

[0101] In this optional embodiment, the voltage waveform formed by the collected voltage signals includes multiple groups. In this embodiment, the control unit 300 can obtain the voltage waveform formed by the voltage signals under multiple damping coefficients by continuously collecting the voltage signals output by the receiving coil 200 in real time through the signal detection unit 100 by adjusting the damping coefficient. In a specific example, for example, the initial damping coefficient is set to 0.5, the control unit 300 collects the voltage signals corresponding to the current damping coefficient through the signal detection unit 100, and then adjusts the damping coefficient multiple times, for example, increases the damping coefficient by 0.1 each time until a preset damping coefficient threshold (such as 2). Thus, the control unit 300 can obtain the voltage waveform formed by the voltage signals corresponding to multiple adjusted damping coefficients.

[0102] In this embodiment, by subtracting and integrating the multiple voltage waveforms from the ideal voltage waveform corresponding to the optimal damping coefficient, the minimum integral value indicates that the optimal damping coefficient is closest to the optimal damping coefficient. The damping coefficient corresponding to the voltage waveform used to calculate the minimum integral value is used as the optimal damping coefficient required by the receiving coil under the current environment. Thus, the optimal matching resistance value is selected for the receiving coil, avoiding signal distortion due to an inappropriate resistance value of the matching resistance R m , resulting in oscillation or slow attenuation of the signals collected by the receiving coil. 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 for electromagnetic signals and reducing signal distortion and attenuation.

[0103] Specifically, in an application example, as an optional embodiment in this embodiment, the integral formula for subtracting and integrating the voltage waveform formed by the collected voltage signals from the voltage waveform under the optimal damping coefficient in the damping adjustment model is:

[0104]

[0105] wherein, represents the voltage value of the ideal voltage waveform under the optimal damping coefficient in the damping adjustment model at the i-th sampling time, represents the voltage value of the voltage waveform formed by the collected voltage signals at the i-th sampling time, n represents the number of sampling points, and f represents the sampling frequency. In this example, the current sampling frequency and the sampling frequency of the ideal voltage waveform use the same frequency value. Of course, the method of subtracting and integrating provided in this application example is only an optional way to select the voltage waveform closest to the voltage waveform under the optimal damping coefficient, and the present application does not limit this.

[0106] In the second mode, as an optional implementation of the exemplary embodiment of the present application, the voltage signal is analyzed according to the preset damping adjustment algorithm and damping adjustment model to determine the optimal damping coefficient required by the receiving coil in the current environment, including:

[0107] The adjustment time ts of the voltage value of the voltage signal entering the steady state after the off time is calculated, and the adjustment time ts is compared with the optimal adjustment time TS in the damping adjustment model.

[0108] If ts≤TS, the current damping coefficient is the optimal damping coefficient required by the receiving coil in the current environment.

[0109] If ts>TS, the current damping coefficient is reduced by a preset value to obtain an adjusted damping coefficient, the adjusted damping coefficient is taken as the optimal damping coefficient required by the receiving coil in the current environment, and the voltage value of the voltage signal adjusted by the damping coefficient is continuously received, and the adjustment time ts is recalculated according to the voltage value of the voltage signal adjusted by the damping coefficient. If the adjustment time ts increases, the adjusted damping coefficient is increased by a preset value to be taken as the optimal damping coefficient required by the receiving coil in the current environment, and if the adjustment time ts decreases, the adjusted damping coefficient is continuously reduced by a preset value to be taken as the adjusted damping coefficient. The operation of taking the adjusted damping coefficient as the optimal damping coefficient required by the receiving coil in the current environment and continuously receiving the voltage value of the voltage signal adjusted by the damping coefficient is repeatedly performed until the recalculated adjustment time ts increases, and the current damping coefficient is increased by a preset value to be taken as the optimal damping coefficient required by the receiving coil in the current environment.

[0110] In the optional implementation, the optimal damping coefficient required by the receiving coil in 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.

[0111] As an optional implementation of the exemplary embodiment of the present application, the control unit 300 calculates the adjustment time ts of the voltage value of the voltage signal entering the steady state after the off time, including: taking the curve of the voltage value of the voltage signal entering the steady state after the off time as a response curve; taking the shortest time required for the response curve to enter and remain in the steady state range as the adjustment time ts, wherein the steady state range is the reference value ± error range, and the response value of the voltage value of the voltage signal entering the steady state after the off time is taken as the reference value.

[0112] Figure 3 The relationship between the voltage value entering the steady state after the off time and the adjustment time is shown in the schematic diagram of the exemplary embodiment of the present application. As shown in Figure 3 the off time is the off time, represents the maximum value of the induced voltage of the receiving coil 200, represents the reference value for entering the steady state, and the steady state range is , the adjustment time ts represents the shortest time for the induced voltage value to enter and stabilize in . In the present embodiment, the voltage value of the voltage signal received by the control unit 300 under the current environment is , and the adjustment time ts is the shortest time for the voltage value of the voltage signal after the turn-off time to enter the steady state and remain in the steady state range.

[0113] For each damping value, the adjustment time ts for the collected voltage to enter the steady state after the turn-off time is obtained in this way, and when ts is the minimum value, it is the optimal adjustment time TS, and the corresponding damping is the optimal damping. The optimal damping in the damping adjustment model is determined according to the optimal adjustment time TS. Therefore, the minimum value of the adjustment time required for the voltage response curve to enter the steady state after the turn-off time can determine the optimal damping.

[0114] In the above-described example embodiment of the present application for determining the optimal damping coefficient required by the receiving coil under 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 under the current environment, and the damping coefficient does not need to be adjusted. If ts>TS, it means that the damping coefficient of the receiving coil 200 under the current environment is not optimal, and the current damping coefficient is first reduced by a preset value (for example, -0.1) and sent to the damping adjustment unit 400 to adjust the matching resistance. The control unit 300 receives the voltage value of the adjusted voltage signal collected by the signal detection unit 100 again, calculates the adjustment time ts under the current damping coefficient, and if ts decreases (compared with the last calculated adjustment 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 to adjust the matching resistance. If ts decreases (compared with the last calculated adjustment time), the adjusted damping coefficient is continuously reduced by a preset value (for example, -0.1) to obtain the adjusted damping coefficient, and the collected voltage signal after the damping coefficient adjustment is continuously received, and the calculated adjustment time is compared with the last adjustment time. If it is larger than the last adjustment time, it is taken as the current optimal damping coefficient, and the adjustment is completed, otherwise, the damping coefficient is continuously reduced until the adjustment time calculated by the new damping coefficient is larger than the last adjustment time, and the adjustment is completed.

[0115] ​In the embodiment, the shorter the adjustment time, the better the damping coefficient, and thus, the damping coefficient is adjusted to determine the optimal damping coefficient required by the receiving coil in the current environment through analysis and comparison of the adjustment time corresponding to the current damping coefficient, thereby avoiding signal distortion due to the improper resistance value of the matching resistor R m , causing the signals collected by the receiving coil to oscillate or attenuate slowly. 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 for electromagnetic signals and reducing signal distortion and attenuation.

[0116] S540, adjusting the resistance value of the matching resistor according to the optimal damping coefficient.

[0117] 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 the 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.

[0118] As an optional implementation in an exemplary embodiment of the present application, the transient electromagnetic coil adaptive damping matching method provided in the embodiment further includes: outputting a time sequence pulse to control the charging and discharging 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 charging and discharging unit 600 is controlled by the control unit 300 to trigger the receiving coil 200 to generate a voltage signal.

[0119] As an optional implementation in an exemplary embodiment of the present application, the transient electromagnetic coil adaptive damping matching method provided in the embodiment further includes: sending the voltage waveform data collected by the receiving coil, damping adjustment parameters, working status and other information to the communication unit 700 to report to the upper computer, so that the upper computer can obtain the information of the transient electromagnetic coil adaptive damping matching device in real time.

[0120] Through the transient electromagnetic coil adaptive damping matching method provided in the embodiment, the problem of signal distortion due to the improper resistance value of the matching resistor R mThe signal distortion caused by the improper resistance value of the receiving coil, the oscillation of the signal collected by the receiving coil, and the slow attenuation of the signal can be solved. The damping coefficient of the receiving coil can be adaptively adjusted according to different detection environments and working conditions, the bandwidth and stability of the receiving coil for the electromagnetic signal are effectively improved, and the signal distortion and attenuation are reduced.

[0121] The transient electromagnetic coil adaptive damping matching method provided by the embodiment is applied and described below by taking two specific application examples.

[0122] Figure 6 A flowchart of a transient electromagnetic coil adaptive damping matching method provided by the application example is shown. As shown in Figure 6 The transient electromagnetic coil adaptive damping matching method includes the following steps (S610-S680):

[0123] S610, system initialization, the data storage unit loads the preset damping adjustment model;

[0124] S620, the signal control unit controls the charging and discharging unit to charge and discharge according to the set working time sequence, and the signal detection unit collects the induced voltage of the receiving coil in real time and transmits it to the control unit;

[0125] S630, the control unit sets the initial damping coefficient to 0.5, adjusts the damping coefficient by increasing 0.1 each time from 0.5 to 2, and obtains the voltage waveform formed by the voltage signal collected by the signal detection unit after adjusting the damping coefficient each time;

[0126] S640, read the damping adjustment model of the data storage unit;

[0127] S650, subtract the voltage waveform formed by the collected voltage signal from the voltage waveform under the optimal damping coefficient in the damping adjustment model to obtain the integral, and the integral formula is:

[0128]

[0129] Wherein, represents the voltage value of the ideal voltage waveform under the optimal damping coefficient in the damping adjustment 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 time, n represents the number of sampling points, and f represents the sampling frequency.

[0130] S660, the control unit saves the integral data and finds the minimum integral value; the damping coefficient corresponding to the voltage waveform with the minimum integral value is taken 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;

[0131] S670, the damping adjustment unit adjusts the resistance value of the matching resistance according to the resistance value under the optimal damping coefficient;

[0132] S680, the communication unit periodically transmits the working state, damping parameters and other key information of the system to the upper computer for real-time monitoring and data analysis by the operator.

[0133] Figure 7 A flow chart of a transient electromagnetic coil adaptive damping matching method provided by the present application is shown. As shown in the figure, Figure 7 The transient electromagnetic coil adaptive damping matching method comprises the following steps (S710-S790):

[0134] S710, system initialization, the data storage unit loads the preset damping adjustment model;

[0135] S720, the signal control unit controls the charging and discharging unit according to the set working time sequence, and the signal detection unit collects the induced voltage of the receiving coil in real time and transmits it to the control unit;

[0136] S730, the control unit calculates the adjustment time ts of entering the steady state after the off time according to the voltage value of the voltage signal;

[0137] S740, read the damping adjustment model of the data storage unit, compare 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, execute step S770; if ts>TS, execute step S750;

[0138] S750, reduce the current damping coefficient by 0.1, and continue to collect the voltage value of the voltage signal after the damping coefficient adjustment;

[0139] S760, according to the voltage value of the voltage signal after the damping coefficient adjustment, recalculate the adjustment time ts, and judge the adjustment time ts, if the adjustment time ts increases, the new damping coefficient after the current damping coefficient +0.1 is taken as the optimal damping coefficient required by the receiving coil under the current environment, execute step S770, otherwise, return to step S750;

[0140] S770, read the resistance value under the optimal damping coefficient required by the receiving coil under the current environment, and send it to the damping adjustment unit;

[0141] S780, the damping adjustment unit adjusts the resistance value of the matching resistance according to the resistance value under the optimal damping coefficient;

[0142] S790, the communication unit periodically transmits the working state, damping parameters and other key information of the system to the upper computer for real-time monitoring and data analysis by the operator.

[0143] The transient electromagnetic coil adaptive damping matching method provided by the embodiment avoids the problems of signal distortion, oscillation or slow attenuation of the signal collected by the receiving coil due to the improper resistance value of the matching resistor R m , and can adaptively adjust the damping coefficient of the receiving coil according to different detection environments and working conditions, effectively improves the bandwidth and stability of the receiving coil to the electromagnetic signal, and reduces signal distortion and attenuation.

[0144] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0145] It should be understood that the application is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is limited only by the appended claims.

Claims

1. A transient electromagnetic coil adaptive damping matching device, characterized in that, include: The signal detection unit (100), receiving coil (200), control unit (300), damping adjustment unit (400), and data storage unit (500) are included; 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), and the second input terminal of the control unit (300) is connected to the input and output terminals of the data storage unit (500). 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 data storage unit (500) is used to store a pre-established damping adjustment model. The damping adjustment model is the data obtained by the control unit (300) under different test environments and conditions. The damping adjustment model includes: resistance value, voltage waveform data, adjustment time corresponding to different damping coefficients, and resistance value, voltage waveform, and optimal adjustment time corresponding to the optimal damping coefficient. 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 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.

2. The apparatus 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 to determine the optimal damping coefficient required by the receiving coil under the current environment: The voltage waveform formed by the acquired voltage signal is compared with the voltage waveform corresponding to the optimal damping coefficient in the damping adjustment model by taking the difference and integrating. The damping coefficient corresponding to the voltage waveform with the smallest integral value is taken as the optimal damping coefficient required by the receiving coil under the current environment.

3. The apparatus according to claim 2, characterized in that, The integral formula for calculating the difference between the voltage waveform formed by the acquired voltage signal and the voltage waveform corresponding to the optimal damping coefficient in the damping adjustment model is as follows: in, This represents the voltage value of the voltage waveform corresponding to the optimal damping coefficient in the damping adjustment model at the i-th sampling time. The voltage value of the voltage waveform formed by the acquired voltage signal at the i-th sampling time is represented by n, where n represents the number of sampling points and f represents the sampling rate.

4. The apparatus 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 to determine the optimal damping coefficient required by the receiving coil under the current environment: The control unit (300) calculates the adjustment time ts after the turn-off time based on the voltage value of the voltage signal and enters the steady state, and compares the adjustment time ts with the optimal adjustment time TS in the damping adjustment model. If ts≤TS, then 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 the adjusted damping coefficient. The adjusted damping coefficient is used as the optimal damping coefficient required by the receiving coil under the current environment. The voltage value of the voltage signal after the damping coefficient adjustment collected by the signal detection unit (100) is received. The adjustment time ts is recalculated based on the voltage value of the voltage signal after the damping coefficient adjustment. 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 under the current environment. If the adjustment time ts decreases, the adjusted damping coefficient is further decreased by the preset value and used as the adjusted damping coefficient. The operation of using the adjusted damping coefficient as the optimal damping coefficient required by the receiving coil under the current environment and continuing to receive the voltage value of the voltage signal after the damping coefficient adjustment collected by the signal detection unit (100) 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 under the current environment.

5. The apparatus according to claim 4, characterized in that, The control unit (300) calculates the adjustment time ts after the turn-off time based on the voltage value of the voltage signal in the following manner: The curve of the voltage value of the voltage signal entering a steady state after the turn-off time is used as the response curve; The shortest time required for the response curve to enter and remain within the steady-state range is taken as the settling time ts, where the steady-state range is a reference value ± error range, and the reference value is the response value of the voltage signal entering the steady state after the turn-off time.

6. The apparatus according to claim 1, characterized in that, The control unit (300) is also used to establish the damping adjustment model in the following manner: Obtain the inductance, capacitance, and resistance (LCR) parameters of the receiving coil (200); The damping coefficient is adjusted by changing the resistance value of the matching resistor while keeping the LCR parameter constant. Obtain the corresponding relationship of transient electromagnetic response process under different damping coefficients, and establish the damping adjustment model.

7. The apparatus according to claim 1, characterized in that, Also includes: Charge / discharge unit (600). The control terminal of the charging and discharging unit (600) is connected to the second output terminal of the control unit (300) and is used to charge and discharge according to the timing pulse output by the control unit (300) to generate 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 the transient electromagnetic coil adaptive damping matching device as described in any one of claims 1 to 7, characterized in that, include: Continuously acquire the voltage signal output by the receiving coil; Obtain the damping adjustment model; The voltage signal is analyzed 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. The damping adjustment model is the data obtained by the control unit under different test environments and conditions. The damping adjustment model includes: the resistance value, voltage waveform data, and adjustment time corresponding to different damping coefficients, as well as the resistance value, voltage waveform, and optimal adjustment time corresponding to the optimal damping coefficient. Adjust the resistance value of the matching resistor according to the optimal damping coefficient.

9. The method according to claim 8, characterized in that, The step of 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 acquired voltage signal is compared with the voltage waveform corresponding to the optimal damping coefficient in the damping adjustment model by taking the difference and integrating. The damping coefficient corresponding to the voltage waveform with the smallest integral value is taken 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 step of 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 adjustment time ts after the turn-off time is calculated based on the voltage value of the voltage signal, and the adjustment time ts is compared with the optimal adjustment time TS in the damping adjustment model. If ts≤TS, then 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 the adjusted damping coefficient. This adjusted damping coefficient is then used as the optimal damping coefficient required by the receiving coil under the current environment. The voltage value of the acquired voltage signal after damping coefficient adjustment is then continuously received, and the adjustment time ts is recalculated based on the voltage value of the voltage signal after damping coefficient adjustment. 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 under 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. This process of using the adjusted damping coefficient as the optimal damping coefficient required by the receiving coil under the current environment and continuing to receive the voltage value of the acquired voltage signal after damping coefficient adjustment 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 under the current environment.

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