CN108254791A - A kind of Transient Electromagnetic Transmitter damping coalignment and method - Google Patents

Abstract

The application discloses a transient electromagnetic transmitter damping matching device and method, including a damping adjustment module and a control module; wherein, the first end of the damping adjustment module is connected to the first output end of the transmitting coil, and the second end of the damping adjustment module The second output end of the transmitting coil is connected, and the control end of the damping adjustment module is connected to the output end of the control module; the damping adjustment module is used to adjust the resistance value of the damping resistance by using the control signal output by the control module. In this application, a damping adjustment module controlled by the control module is connected in series between the first output end and the second output end of the transmitting coil of the transient electromagnetic transmitter, so that after the transmitting coil is replaced, the damping adjustment module can be based on the control module. The control signal adjusts its own damping resistance to match the damping resistance with the current transmitting coil, which can better absorb the current overshoot and oscillation between the two output terminals of the transmitting coil.

Description

A transient electromagnetic transmitter damping matching device and method

technical field

The invention relates to the field of geological exploration, in particular to a damping matching device and method for a transient electromagnetic transmitter.

Background technique

Transient electromagnetic method, also known as time-domain electromagnetic method, is a method of detecting the electrical parameters of underground media by using the law of electromagnetic induction. It is widely used in mineral exploration, water resource detection, geological structure research, oil field exploration and non-destructive testing. and many other fields. The transient electromagnetic transmitter periodically sends constant-amplitude pulse currents to the ground through the ungrounded transmitting coil, establishes a pulsed magnetic field underground, and then receives the pulse current through the receiving coil to shut off the secondary eddy current field formed in the gap geological body, and By analyzing and processing the secondary field data, the underground geological structure can be obtained.

The transmitting coil of the transient electromagnetic transmitting device can be divided into two types according to the size of the large loop and the transmitting coil of the multi-turn small wire frame. Due to some of its own characteristics, the multi-turn small wire frame coil has not only coil inductance and internal resistance, but also inter-turn distributed capacitance in its equivalent model, and the response formed by distributed capacitance and inductance is a typical second-order response. When the transmitting current is cut off suddenly, if only the constant voltage clamping circuit is connected to both ends of the transmitting coil without absorbing circuit, the current overshoot and oscillation will often appear at the end of the shutdown.

Therefore, there is a need for a absorbing circuit capable of absorbing current overshoot and oscillation between the two output terminals of the transmitting coil of the transient electromagnetic transmitting device.

Contents of the invention

In view of this, the object of the present invention is to provide a transient electromagnetic transmitter damping matching device and method to absorb the current overshoot and oscillation between the two output ends of the transmitting coil. The specific plan is as follows:

A transient electromagnetic transmitter damping matching device, including a damping adjustment module and a control module; wherein, the first end of the damping adjustment module is connected to the first output end of the transmitting coil, and the second end of the damping adjustment module is connected to the The second output end of the transmitting coil, the control end of the damping adjustment module is connected to the output end of the control module;

The damping adjustment module is used to adjust the resistance value of the damping resistor by using the control signal output by the control module.

Optionally, the damping adjustment module includes a plurality of damping resistors, a total controllable switch, and a plurality of branch controllable switches corresponding to each damping resistor; wherein, a plurality of damping resistors are connected in series with the total controllable switch Between the first output end and the second output end of the transmitting coil, one end of the total controllable switch is connected to the first output end or the second output end of the transmitting coil, and each branch controllable switch is connected in parallel on the corresponding damping resistor;

The control module includes a control unit corresponding to each branch controllable switch and the total controllable switch, and the output terminal of each control unit is connected to the control terminal of each branch controllable switch and the total controllable switch.

Optionally, the damping adjustment module includes a plurality of damping units, and each damping unit includes a damping resistor connected in series with each other and a controllable switch corresponding to the damping resistor; wherein each damping unit is connected in series with the transmitting coil Between the first output end and the second output end of each damping unit are connected in parallel with each other;

The control module includes a control unit corresponding to each damping unit, and the output terminal of each control unit is connected with the control terminal of the controllable switch in each damping unit.

Optionally, the controllable switch is a triac.

Optionally, the damping resistors in each damping unit have the same resistance value.

Optionally, the resistance values of the damping resistors in each damping unit are different.

Optionally, each damping unit further includes a filter resistor and a filter capacitor connected in parallel with the controllable switch, the filter capacitor is connected in series with the filter resistor, and one end of the filter capacitor is connected between the damping resistor and the filter capacitor. Between the controllable switches, one end of the filter resistor is connected to the second output end of the transmitting coil.

Optionally, each control unit includes a controller, a first photoelectric isolator, a second photoelectric isolator, a first resistor and a second resistor; wherein, the control terminal of the controller is connected to the control terminal, and the controller The first terminal of the first photoelectric isolator is connected with the second terminal of the first photoelectric isolator, the first terminal of the first photoelectric isolator is connected with the second terminal of the second photoelectric isolator, and the first photoelectric isolator The third end of the first photoelectric isolator is connected to the control end of the controllable switch, the fourth end of the first photoelectric isolator is connected to one end of the first resistor, and the other end of the first resistor is connected to the second photoelectric isolator. The third end of the isolator is connected, the first end of the second photoelectric isolator is connected to one end of the second resistor, and the other end of the second resistor is connected to the positive pole of the power supply;

The control module further includes a current-limiting resistor, the fourth terminal of the second photoelectric isolator is connected to the current-limiting resistor, and the other terminal of the current-limiting resistor is connected to the first output terminal of the transmitting coil.

The present invention also discloses a transient electromagnetic transmitter damping matching method, which is applied to the aforementioned transient electromagnetic transmitter damping matching device, including:

Obtain various parameters of the current transmitting coil, use the pre-calculated correspondence between various parameters of the transmitting coil of each specification and the damping resistance, generate a control signal corresponding to the current transmitting coil, and control the transient electromagnetic transmitter damping matching device , access the damping resistor corresponding to the current transmitting coil.

In the present invention, the transient electromagnetic transmitter damping matching device includes a damping adjustment module and a control module; wherein, the first end of the damping adjustment module is connected to the first output end of the transmitting coil, and the second end of the damping adjustment module is connected to the first output end of the transmitting coil. The second output end, the control end of the damping adjustment module is connected to the output end of the control module; the damping adjustment module is used to adjust the resistance value of the damping resistance by using the control signal output by the control module. In the present invention, a damping adjustment module controlled by the control module is connected in series between the first output end and the second output end of the transmitting coil of the transient electromagnetic transmitter, so that after the transmitting coil is replaced, the damping adjustment module can transmit according to the control module. The control signal adjusts its own damping resistance to match the damping resistance with the current transmitting coil, which can better absorb the current overshoot and oscillation between the two output terminals of the transmitting coil.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is a structural schematic diagram of a transient electromagnetic transmitter damping matching device disclosed in an embodiment of the present invention;

Fig. 2 is a structural schematic diagram of another transient electromagnetic transmitter damping matching device disclosed in an embodiment of the present invention;

Fig. 3 is a structural schematic diagram of another transient electromagnetic transmitter damping matching device disclosed in an embodiment of the present invention;

Fig. 4 is a structural schematic diagram of another transient electromagnetic transmitter damping matching device disclosed in an embodiment of the present invention;

Fig. 5 is a schematic flowchart of a damping matching method for a transient electromagnetic transmitter disclosed in an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The embodiment of the present invention discloses a transient electromagnetic transmitter damping matching device, as shown in Figure 1, the device includes a damping adjustment module 11 and a control module 12; wherein, the first end of the damping adjustment module 11 is connected to the first end of the transmitting coil An output end 13, the second end of the damping adjustment module 11 is connected to the second output end 14 of the transmitting coil, and the control end of the damping adjustment module 11 is connected to the output end of the control module 12;

The damping adjustment module 11 is configured to adjust the resistance value of the damping resistor by using the control signal output by the control module 12 .

Specifically, the damping adjustment module 11 is connected in series between the first output end 13 and the second output end of the transmitting coil of the transient electromagnetic transmitter, and the damping adjustment module 11 is used as the absorbing circuit to absorb the current that the transmitting coil appears at the end of shutdown For overshoot and oscillation, the damping adjustment module 11 can accept the control signal sent by the control module 12 connected to it. When the transmitting coil is replaced and the parameter specification of the transmitting coil changes, the damping adjustment module 11 can use the control signal damping adjustment module 11 to adjust The resistance value of the internal damping resistor is matched with the current transmitting coil to ensure that the current overshoot and oscillation that occur at the end of the current transmitting coil can be absorbed.

It can be understood that the above-mentioned control module 12 can receive a control command output by a control terminal, such as a computer, and the control module 12 generates a corresponding control signal according to the control command, and sends it to the control terminal of the damping adjustment module 11 through the output terminal.

It can be seen that in the embodiment of the present invention, a damping adjustment module 11 controlled by the control module 12 is connected in series between the first output end 13 and the second output end of the transmitting coil of the transient electromagnetic transmitter, so that after the transmitting coil is replaced, the damping adjustment module 11 is connected in series. The adjustment module 11 can adjust its own damping resistance according to the control signal sent by the control module 12, so that the damping resistance matches the current transmitting coil, and can better absorb the current overshoot and oscillation between the two output ends of the transmitting coil.

The embodiment of the present invention discloses a specific damping matching device for a transient electromagnetic transmitter. Compared with the previous embodiment, this embodiment further explains and optimizes the technical solution. specific:

Referring to Fig. 2, the above-mentioned damping adjustment module 11 may include a plurality of damping units 111, and each damping unit 111 includes damping resistors connected in series (R1-R4 are damping resistors in different damping units) and corresponding to the damping resistors. controllable switches (Q1-Q4 are all controllable switches in different damping units); wherein, each damping unit 111 is connected in series between the first output end 13 and the second output end of the transmitting coil, each damping unit 111 connected in parallel with each other;

The control module 12 includes a control unit 121 corresponding to each damping unit 111 , and an output terminal of each control unit 121 is connected to a control terminal of a controllable switch in each damping unit 111 .

Specifically, whether the damping resistor in each damping unit 111 is connected between the first output terminal 13 and the second output terminal of the transmitting coil is determined by whether the controllable switch in each damping unit 111 is turned on. When a damping unit 111 If the controllable switch in the damping unit 111 is turned on, the damping resistor in the damping unit 111 will be connected between the first output terminal 13 and the second output terminal of the transmitting coil, because there are many series connections between the two output terminals of the transmitting coil. Two damping units 111 connected in parallel, when the controllable switches that control different numbers of damping units 111 are turned on, the damping resistance of the transmitting coil changes accordingly, thereby realizing adjusting the damping resistance between the two output ends of the transmitting coil, so that when transmitting After the coil is replaced, the damping adjustment module 11 can adjust the damping resistance accordingly, so that the resistance of the current damping resistance matches the current transmitting coil; each controllable switch is controlled by the control unit 121 connected to the control terminal in the control module 12 to determine whether it is turned on .

Further, as shown in FIG. 3 , in order to better absorb the current overshoot and oscillation of the transmitting coil, each damping unit 111 may also include a filter resistor connected in parallel with a controllable switch (R5-R8 are all from different damping units. filter resistor) and filter capacitor (C1~C4 are all filter capacitors in different damping units), the filter capacitor is connected in series with the filter resistor, one end of the filter capacitor is connected between the damping resistor and the controllable switch, and one end of the filter resistor is connected to the transmitting coil The second output terminal 14 is connected.

Specifically, when the controllable switch is not turned on, the damping resistor, filter capacitor and filter resistor in the damping unit 111 are sequentially connected in series between the first output terminal 13 and the second output terminal of the transmitting coil, and one end of the damping resistor is connected to the transmitting coil. The first output end 13 of the coil is connected, the other end of the damping resistor is connected to one end of the filter capacitor, one end of the filter resistor is connected to the second output end 14 of the transmitting coil, and the other end of the filter resistor is connected to the other end of the filter capacitor. The capacitor adopts a small capacitor, and the filter resistor adopts a large resistor, so that the damping resistor, the filter capacitor and the filter resistor can perform an RC high-frequency filter circuit between the first output terminal 13 and the second output terminal of the transmitting coil, which is not equivalent to the transmitting coil. The circuit model has a substantial impact, and at the same time it can absorb the current overshoot and oscillation of the transmitting coil; when the controllable switch is turned on, since the filter capacitor and filter resistor are connected in parallel with the controllable switch, the turn-on of the controllable switch will be Short-circuit the filter capacitor and filter resistor, so that the damping resistor is directly connected between the two output terminals of the transmitting coil.

In the embodiment of the present invention, each control unit 121 may specifically include a controller (U1-U4 are all controllers in different control units), a first photoelectric isolator (U6, U8, U10 and U12 are all in different control units) The first photoelectric isolator), the second photoelectric isolator (U5, U7, U9 and U11 are the second photoelectric isolators in different control units), the first resistor (R14~R17 are the first photoelectric isolators in different control units) One resistor) and the second resistor (R10～R13 are the second resistors in different control units); wherein, the control terminal of the controller is connected with the control terminal, and the first terminal of the controller is connected with the second terminal of the first photoelectric isolator. The first terminal of the first photoelectric isolator is connected with the second terminal of the second photoelectric isolator, the third terminal of the first photoelectric isolator is connected with the control terminal of the controllable switch, and the fourth terminal of the first photoelectric isolator The terminal is connected with one terminal of the first resistor, the other terminal of the first resistor is connected with the third terminal of the second photoelectric isolator, the first terminal of the second photoelectric isolator is connected with one terminal of the second resistor, and the other terminal of the second resistor Connect to the positive pole of the power supply;

The control module 12 also includes a current limiting resistor R9, the fourth end of the second photoelectric isolator is connected to the current limiting resistor R9, and the other end of the current limiting resistor R9 is connected to the first output end 13 of the transmitting coil.

Specifically, the photoelectric isolator in each control unit 121 can realize the photocoupler isolation for the MOC3081 photocoupler to ensure that the control signal will not interfere with the transmitting coil. connected so that the light-emitting diodes of the second photoelectric isolator and the first photoelectric isolator emit light when the controller is turned on, and the fourth terminal of the second photoelectric isolator is connected with the first output terminal of the generating coil through the current limiting resistor R9 Connected, the electrical signal of the first output terminal 13 of the transmitting coil is input to the control terminal of the controllable switch in the damping unit 111 through the current limiting resistor R9, the second photoelectric isolator, the first resistor and the first photoelectric isolator, as a control The signal turns on the controllable switch, the controller of the control unit 121 can be the FDS6688 control chip, the control terminal of the FDS6688 control chip is connected to the control terminal, receives the control command, and correspondingly turns on the first photoelectric isolator and the second photoelectric isolator , the input terminal of the FDS6688 control chip, namely the first terminal, is connected to the second terminal of the first photoelectric isolator, and the output terminal of the FDS6688 control chip is grounded.

It can be understood that the control terminal sends a plurality of control signals to the corresponding control unit 121, so as to control the connection of multiple damping resistors between the two output ends of the transmitting coil, and realize the damping resistance between the two output ends of the transmitting coil. change in total resistance.

It can be understood that the above-mentioned controllable switch can be a triac, the resistance values of the damping resistors in each damping unit 111 are the same, and the resistance values of the damping resistors in each damping unit 111 can also be different. Other combinations can be used, which can be set according to actual application requirements, and are not limited here; when the resistance values of the damping resistors in each damping unit 111 are the same, then as the connection between the two output ends of the transmitting coil When the damping resistance increases, the damping resistance value of the transmitting coil, that is, the total resistance value decreases with a unit change rate, and the resistance value adjustment is simple and fast. For example, there are 4 damping units in total, and there are five combinations in total; but each damping unit The resistance values of the damping resistors in the unit 111 are the same, and the selection range of the resistance values is small. Therefore, the resistance values of the damping resistors in the damping unit can be different, and a variety of damping resistors can be produced by combining damping resistors with different resistance values. For collocation, for example, if there are 4 damping units in total, there are 16 combinations in total.

In addition, the embodiment of the present invention also discloses a specific transient electromagnetic transmitter damping matching device, as shown in Figure 4, the device includes:

The damping adjustment module 11 may include a plurality of damping resistors (R1~R4 are all damping resistors), a total controllable switch Q5 and a plurality of branch controllable switches corresponding to each damping resistor (Q1~Q4 are all branch controllable switch); wherein, a plurality of damping resistors and the total controllable switch Q5 are connected in series between the first output terminal 13 and the second output terminal 14 of the transmitting coil, and one end of the total controllable switch Q5 is connected to the first output terminal 13 of the transmitting coil Or the second output terminal 14 is connected, and each branch controllable switch is connected in parallel with the corresponding damping resistor;

The control module 12 includes a control unit 121 corresponding to each branch controllable switch and the total controllable switch Q5, and the output terminal of each control unit 121 is connected to the control terminal of each branch controllable switch and the total controllable switch Q5 .

Specifically, the total controllable switch Q5 is connected in series with the ends of multiple damping resistors and the first output terminal 13 or the second output terminal 14 of the transmitting coil. Between the first output terminal 13 and the second output terminal 14 of the coil, the conduction of each branch controllable switch will short-circuit the corresponding damping resistance. Therefore, after the control of the total controllable switch Q5 is conducted, different control The controllable switch of the branch circuit is turned on, which can adjust the resistance value of the damping resistance between the first output terminal 13 and the second output terminal 14 of the transmitting coil, so that the resistance value of the current damping resistance matches the current transmitting coil, the embodiment of the present invention The control unit 121 can refer to the specific structure in the foregoing embodiments, and the principle is the same.

Correspondingly, the embodiment of the present invention also discloses a transient electromagnetic transmitter damping matching method, as shown in FIG. 5 , the method includes:

S11: Obtain the parameters of the current transmitting coil, use the pre-calculated correspondence between the parameters of each specification transmitting coil and the damping resistance, generate a control signal corresponding to the current transmitting coil, and control the transient electromagnetic transmitter damping matching device , access the damping resistor corresponding to the current transmitting coil.

Specifically, the process of pre-calculating the parameters of the transmitting coils of various specifications may include:

The expression of the damping resistance is obtained from the equivalent circuit of the transmitting coil. The equivalent circuit model of the transmitting coil is that the equivalent inductance and internal resistance of the coil are connected in parallel with the equivalent distributed capacitance, and the connected matching damping resistance is also connected in parallel.

The equivalent circuit is a second-order circuit, and its transfer function is formula (1):

The time domain expression of the equivalent circuit is (2):

The above formula can be simplified as:

In formula (3) ω _p , ω ₀ represent the resonant frequency and natural resonant frequency of the transmitting coil, respectively.

Damping coefficient

When the critical damping ζ=1, the damping resistance can be solved by formula (4) as

The calculation of the internal resistance of the transmitting coil uses the determination formula of the wire resistance calculate;

In the formula, ρ is the resistivity of the coil wire, l is the length of the coil wire, and S is the cross-sectional area of the coil wire.

The solution for the inductance of the transmitting coil is

In the formula, d is the diameter of the transmitting coil, N is the number of turns of the coil, μ ₀ is the magnetic permeability in vacuum, Φ is the amount that changes with the ratio k (k=l/d), and the calculation formula of Φ refers to the short helical tube coil model (when k is a decimal value);

The size of the distributed capacitance of the multi-turn small wire frame coil is related to the cross-sectional area of the wire, the thickness of the insulating layer, and the distance between the turns of the coil. When the transmitting coil has a tight structure between turns, the distance between the two coils is only the insulating layer. The thickness of the insulating layer has a great influence on the distributed capacitance. Using the Maxwell 2-D electrostatic axisymmetric solver, the parasitic capacitance between turns of the coil can be quickly simulated and calculated by using the finite element model. After the coil inter-turn parasitic capacitance is obtained through simulation calculation, all intermediate nodes can be eliminated through appropriate matrix operations to obtain the equivalent lumped parasitic capacitance value between the two terminals, which is the distributed capacitance value of the parallel connection at both ends of the coil.

For different transmitting coils commonly used in practical applications, the size of the distributed capacitance value can be simulated and calculated in advance, and the results can be stored in the computer as the data source for the table lookup in field applications. Table 1 is a parameter table of the transmitting coil with different turns and specifications when the effective area of the transmitting coil is fixed at 128m ² .

Table 1

N 2 4 8 16 twenty four 32 48 64 r/Ω 4.515 3.192 2.257 1.596 1.303 1.129 0.922 0.798 R/Ω 0.493 0.697 0.985 1.393 1.706 1.971 2.414 2.786 L/mH 0.197 0.495 1.211 2.893 4.740 6.676 10.645 14.611 C/pF 3822.7 992.2 346.787 140.572 86.913 62.531 40.138 29.410

According to the parameters of the transmitting coil calculated in advance, the corresponding relationship between the transmitting coil and the damping resistance value of different turns is established, so that when the parameters of the transmitting coil change, the damping matching device of the transient electromagnetic transmitter can be controlled according to the parameter table of the transmitting coil, Connect the damping resistor corresponding to the current transmitting coil, so as to better absorb the current overshoot and oscillation of the transmitting coil.

It can be seen that in the embodiment of the present invention, a damping adjustment module controlled by the control module is connected in series between the first output end and the second output end of the transmitting coil of the transient electromagnetic transmitter, so that after the transmitting coil is replaced, the damping adjustment module can According to the control signal sent by the control module, the damping resistance is adjusted to match the damping resistance with the current transmitting coil, which can better absorb the current overshoot and oscillation between the two output terminals of the transmitting coil.

Finally, it should also be noted that in this text, relational terms such as first and second etc. are only used to distinguish one entity or operation from another, and do not necessarily require or imply that these entities or operations, any such actual relationship or order exists. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

Professionals can further realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software or a combination of the two. In order to clearly illustrate the possible For interchangeability, in the above description, the composition and steps of each example have been generally described according to their functions. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.

Above, a kind of transient electromagnetic transmitter damping matching device and method provided by the present invention has been introduced in detail. In this paper, specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help Understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary, the content of this specification is not It should be understood as a limitation of the present invention.

Claims (9)

1. A transient electromagnetic transmitter damping matching device is characterized in that it includes a damping adjustment module and a control module; wherein, the first end of the damping adjustment module is connected to the first output end of the transmitting coil, and the damping adjustment module The second end of the second end is connected to the second output end of the transmitting coil, and the control end of the damping adjustment module is connected to the output end of the control module; The damping adjustment module is used to adjust the resistance value of the damping resistor by using the control signal output by the control module. 2. The transient electromagnetic transmitter damping matching device according to claim 1, wherein the damping adjustment module includes a plurality of damping resistors, a total controllable switch and a plurality of branch circuits corresponding to each damping resistor. controllable switch; wherein, a plurality of damping resistors are connected in series with the total controllable switch between the first output terminal and the second output terminal of the transmitting coil, one terminal of the total controllable switch is connected to the first output terminal of the transmitting coil The output end or the second output end are connected, and the controllable switch of each branch is connected in parallel with the corresponding damping resistance; The control module includes a control unit corresponding to each branch controllable switch and the total controllable switch, and the output terminal of each control unit is connected to the control terminal of each branch controllable switch and the total controllable switch. 3. The transient electromagnetic transmitter damping matching device according to claim 1, wherein the damping adjustment module includes a plurality of damping units, and each damping unit includes a damping resistor connected in series with the damping resistor A corresponding controllable switch; wherein, each damping unit is connected in series between the first output end and the second output end of the transmitting coil, and each damping unit is connected in parallel with each other; The control module includes a control unit corresponding to each damping unit, and the output terminal of each control unit is connected with the control terminal of the controllable switch in each damping unit. 4. The transient electromagnetic transmitter damping matching device according to claim 3, wherein the controllable switch is a triac. 5. The transient electromagnetic transmitter damping matching device according to claim 3, wherein the damping resistors in each damping unit have the same resistance value. 6. The transient electromagnetic transmitter damping matching device according to claim 3, wherein the resistance values of the damping resistors in each damping unit are different. 7. The transient electromagnetic transmitter damping matching device according to any one of claims 3 to 6, wherein each damping unit further includes a filter resistor and a filter capacitor connected in parallel with the controllable switch, and the filter A capacitor is connected in series with the filter resistor, one end of the filter capacitor is connected between the damping resistor and the controllable switch, and one end of the filter resistor is connected to the second output end of the transmitting coil. 8. The transient electromagnetic transmitter damping matching device according to any one of claims 3 to 6, wherein each control unit comprises a controller, a first photoelectric isolator, a second photoelectric isolator, a first resistor and the second resistor; wherein, the control terminal of the controller is connected to the control terminal, the first terminal of the controller is connected to the second terminal of the first photoelectric isolator, and the first terminal of the first photoelectric isolator One end is connected to the second end of the second photoelectric isolator, the third end of the first photoelectric isolator is connected to the control end of the controllable switch, and the fourth end of the first photoelectric isolator is connected to the One end of the first resistor is connected, the other end of the first resistor is connected to the third end of the second photoelectric isolator, the first end of the second photoelectric isolator is connected to one end of the second resistor connected, and the other end of the second resistor is connected to the positive pole of the power supply; The control module further includes a current-limiting resistor, the fourth terminal of the second photoelectric isolator is connected to the current-limiting resistor, and the other terminal of the current-limiting resistor is connected to the first output terminal of the transmitting coil. 9. A transient electromagnetic transmitter damping matching method, characterized in that it is applied to the transient electromagnetic transmitter damping matching device according to any one of claims 1 to 8, comprising: Obtain various parameters of the current transmitting coil, use the pre-calculated correspondence between various parameters of the transmitting coil of each specification and the damping resistance, generate a control signal corresponding to the current transmitting coil, and control the transient electromagnetic transmitter damping matching device , access the damping resistor corresponding to the current transmitting coil.