CN110989004B - Self-compensation three-component dragging transient electromagnetic exploration device and exploration method - Google Patents
Self-compensation three-component dragging transient electromagnetic exploration device and exploration method Download PDFInfo
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- CN110989004B CN110989004B CN201911307580.8A CN201911307580A CN110989004B CN 110989004 B CN110989004 B CN 110989004B CN 201911307580 A CN201911307580 A CN 201911307580A CN 110989004 B CN110989004 B CN 110989004B
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- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/083—Controlled source electromagnetic [CSEM] surveying
Abstract
The invention relates to the field of geophysical exploration equipment, in particular to a self-compensation three-component dragging transient electromagnetic exploration device and an exploration method, wherein the device comprises: the system comprises a towing vehicle platform and a high platform arranged on the towing vehicle platform, wherein the towing vehicle platform and the high platform are laid in parallel, and a z-component receiving coil is laid on the high platform; the system comprises a transmitter coil, an x component receiver coil and a y component receiver coil, wherein the x component receiver coil is laid on the right side of the driving direction of the towing vehicle platform perpendicular to the ground; the Y-component receiving coil central line is superposed with the Y-axis central line of the transmitting coil, so that the problems of overlarge primary field interference and insufficient secondary field information are solved, and the acquisition of three components of zero-offset secondary field information is realized by adopting a separated three-component receiving coil structure.
Description
Technical Field
The invention relates to the field of geophysical exploration equipment, in particular to a self-compensation three-component dragging transient electromagnetic exploration device and an exploration method.
Background
Transient Electromagnetic Methods (TEMs) are geophysical exploration methods based on the law of electromagnetic induction, and due to the characteristics of high working efficiency, simple form, sensitivity to low resistance bodies and the like, the transient electromagnetic methods become important methods for solving the problems of geological structure detection, geological resource exploration and the like. Due to the coupling effect of emission on a receiving coil, effective secondary field signals and primary field interference of the ground TEM (transmission and transmission mode) generate aliasing, and if the primary field interference is strong, the effective secondary field signals cannot be extracted, so that shallow geological information is lost. Therefore, how to weaken the coupling of the transmitting coil and the receiving coil, and obtaining the pure secondary field information of the xyz three components has great significance for realizing the three-dimensional high-precision detection from the shallow layer to the deep layer full space of the terrestrial TEM system.
In the patent application No. 201810256463.2, "aviation magnetic field compensation multi-coil system based on double compensation coils", a method for performing primary field compensation by using a double compensation coil central loop is disclosed, but the compensation method is limited by the size of a transmitting coil, the compensation coil has poor flexibility and limited compensation effect, and primary field accurate compensation is difficult to realize; for a towed transient electromagnetic system, the method cannot acquire richer geological information, and residual primary field interference even can cause that early secondary field signals cannot be extracted.
A three-component transient electromagnetic receiving device designed by a guide rail and the like is disclosed in the patent application No. 201710654527.X, and the device has stronger flexibility, but does not solve the problem of coupling of emission to a receiving coil, and secondary field signals of X, y and z components received under primary field interference generate larger offset and even cause complete distortion of the secondary field signals; if the method is applied to a towed transient electromagnetic system, a field compensation device needs to be additionally designed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a self-compensation three-component dragging transient electromagnetic exploration device, and solves the problems of overlarge interference of a primary field and insufficient information of a secondary field.
The invention further provides a self-compensation three-component dragging transient electromagnetic exploration method.
The present invention is achieved in such a way that,
a self-compensating three-component towed transient electromagnetic survey apparatus, the apparatus comprising: the system comprises a towing vehicle platform and a high platform arranged on the towing vehicle platform, wherein the towing vehicle platform is laid in parallel on the high platform, and z-component receiving coils are laid on the high platform; the system comprises a transmitter coil, an x component receiver coil and a y component receiver coil, wherein the transmitter coil, the x component receiver coil and the y component receiver coil are laid on a trailer platform, the x component receiver coil is laid on the rear side of the trailer platform in the driving direction perpendicular to the ground, the y component receiver coil is laid on the right side of the trailer platform in the driving direction perpendicular to the ground, and the central line of the x component receiver coil in the x direction is superposed with the central line of the transmitter coil in the x axis; the center line of the y component receiving coil in the y direction is superposed with the center line of the y axis of the transmitting coil, the x direction, the y direction and the z direction are mutually orthogonal, the advancing direction of the trailer is the y direction, and the direction vertical to the trailer is the z direction; the initial position of the z-component receiving coil is symmetrical on the plane parallel to the plateau left and right about one side of the transmitting coil parallel to the advancing direction, the initial position of the x-component receiving coil is symmetrical on the side of the transmitting coil perpendicular to the advancing direction up and down, and the initial position of the y-component receiving coil is symmetrical on the side of the transmitting coil parallel to the advancing direction up and down.
Furthermore, the z-component receiving coil is eccentrically laid on a high platform which is 20-30cm away from the towing vehicle platform across the transmitting line of the transmitting coil.
Furthermore, the x-component receiving coil and the y-component receiving coil are horizontally spaced from one side of the transmitting coil by 20-30 cm.
A method of self-compensating three component towed transient electromagnetic surveying, the method comprising:
1) laying coils: the system comprises a towing vehicle platform and a high platform arranged on the towing vehicle platform, wherein the towing vehicle platform and the high platform are laid in parallel, and a z-component receiving coil is laid on the high platform; the system comprises a transmitter coil, an x component receiver coil and a y component receiver coil, wherein the transmitter coil, the x component receiver coil and the y component receiver coil are laid on a trailer platform, the x component receiver coil is laid on the rear side of the trailer platform in the driving direction perpendicular to the ground, the y component receiver coil is laid on the right side of the trailer platform in the driving direction perpendicular to the ground, and the central line of the x component receiver coil in the x direction is superposed with the central line of the transmitter coil in the x axis; the center line of the y component receiving coil in the y direction is superposed with the center line of the y axis of the transmitting coil, the x direction, the y direction and the z direction are mutually orthogonal, the advancing direction of the trailer is the y direction, and the direction vertical to the trailer is the z direction; the initial position of the z-component receiving coil is symmetrical on a plane parallel to the plateau left and right relative to one side of the transmitting coil parallel to the advancing direction, the initial position of the x-component receiving coil is symmetrical on the side of the transmitting coil perpendicular to the advancing direction up and down, and the initial position of the y-component receiving coil is symmetrical on the side of the transmitting coil parallel to the advancing direction down;
2) adjusting the position of a receiving coil: introducing 1KHz and 1A sinusoidal currents into the transmitting coil through the transmitter, observing a received signal through the upper computer, respectively determining the compensation effects of the x-component receiving coil, the y-component receiving coil and the z-component receiving coil, and performing corresponding position adjustment;
3) and excitation and collection are carried out, the transmitter transmits bipolar rectangular waves through the transmitting coil, and the receiver detects secondary field signals through the x-component receiving coil, the y-component receiving coil and the z-component receiving coil.
Further, step 1) coil laying comprises: and the z-component receiving coil is eccentrically laid on a high platform which is 20-30cm away from the towing vehicle platform across the transmitting line of the transmitting coil.
Furthermore, the x-component receiving coil and the y-component receiving coil are horizontally spaced from one side of the transmitting coil by 20-30 cm.
Further, the step 2) of adjusting the position of the receiving coil comprises:
performing z-component receive coil position adjustment: observing whether the received signal of the z-component receiving coil is larger than the system background noise V through an upper computer1If not greater than the system noise floor V1Fixing the position of the z-component receiving coil, and if the received signal is larger than the background noise V1Moving the z-component receiving coil 0.5cm from the initial position to the internal direction of the transmitting coil, if the received signal is reduced, continuing to move to the internal direction of the transmitting coil until the received signal of the z-component receiving coil is less than the background noise V1Fixing the position of the z-component receiving coil, if the received signal is increased, moving the z-component receiving coil to the external direction of the transmitting coil until the received signal of the z-component receiving coil is less than the background noise V1Fixing the z component receive coil position;
x-component receive coil position adjustment: observing whether the received signal of the x-component receiving coil is larger than the system background noise V through an upper computer1If not greater than the system noise floor V1Fixing the position of the x component receiving coil, and if the received signal is larger than the background noise V1Moving the x-component receiving coil vertically and upwardly by 0.5cm from the initial position, if the received signal is reduced, continuing to move vertically and upwardly until the received signal of the x-component receiving coil is less than the background noiseV1Fixing the position of the x-component receiving coil, if the received signal is increased, moving the x-component receiving coil vertically downwards until the received signal of the x-component receiving coil is less than the background noise V1Fixing the x component receiving coil position;
the y-component receive coil position is adjusted in accordance with the x-component receive coil adjustment process.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention adopts a self-compensation receiving method, so that the receiving coil induces two primary fields with opposite directions, and the influence of the primary fields can be automatically attenuated without other extra measures;
(2) the invention adopts a primary field self-compensation adjusting method, is based on the principle of magnetic field reversal at two sides of a transmitting coil, is matched with a complete and effective coil position adjusting method, can quickly find the zero field position of a receiving coil, overcomes the problem of serious interference of a primary field, and realizes the acquisition of a pure secondary field signal;
(3) the invention adopts a separated three-component receiving coil structure, uses three independent receiving coils to receive secondary field signals from the directions of x, y and z, is matched with a primary field self-compensation method, has simple structure, can realize the acquisition of three components of zero-offset secondary field information, and provides technical support for realizing non-blind area and high-precision three-dimensional detection.
Drawings
FIG. 1 is a schematic diagram of the system structure and coil laying method of the present invention;
FIG. 2 is a plan view showing the system structure and coil laying method of the present invention in detail;
FIG. 3 is a flow chart of the method of operation of the present invention;
FIG. 4 is a flow chart of the position adjustment of the receiving coil in the flow of the working method of the present invention;
FIG. 5 is a schematic diagram of the system excitation and collection process in the working method process of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, a self-compensating three-component towed transient electromagnetic surveying device adopts an offset receiving method, uses a double-platform structure, and a towed vehicle platform a and a 20cm high platform C are laid in parallel; the exploration device comprises a transmitting and receiving control system B, wherein the system consists of a transmitter and a receiver; the exploration device also comprises a transmitting coil and a receiving coil; the system comprises a towing vehicle platform, a transmitting coil 4, an x component receiving coil 2 and a y component receiving coil 3, wherein the z component receiving coil 1 is laid on the plane of a high platform;
the X component receiving coil is laid perpendicular to the ground and on the right side of the driving direction of the towing vehicle platform, the Y component receiving coil is laid perpendicular to the ground and on the rear side of the driving direction of the towing vehicle platform, and the center line of the X component receiving coil is superposed with the center line of the X axis of the transmitting coil; the central line of the y component receiving coil is superposed with the central line of the y axis of the transmitting coil, the x direction, the y direction and the z direction are mutually orthogonal, the advancing direction of the trailer is the y direction, and the direction vertical to the trailer is the z direction.
And the z-component receiving coil is eccentrically laid on a high platform which is 20-30cm away from the towing vehicle platform across the transmitting coil of the transmitting coil. The horizontal distance between the x-component receiving coil and the y-component receiving coil and one side of the transmitting coil is 20-30 cm. The z-component receiving coil, the x-component receiving coil and the y-component receiving coil are all at the same distance from the transmitting coil. Preferably 20 cm.
Initial position of z-component receiving coil the initial position of the z-component receiving coil is symmetric about one side of the transmitting coil, the initial position of the x-component receiving coil is vertically symmetric about one side of the transmitting coil, and the initial position of the y-component receiving coil is vertically symmetric about the transmitting coil.
FIG. 2 shows a circuit structure of a self-compensating three-component towed transient electromagnetic surveying apparatus, which mainly comprises a transmitter, a receiver, a transmitting coil and a receiving coil;
the transmitter is formed by connecting a current sensor 5 with a transmitting controller 6, and the transmitting controller 6 is connected with an H-bridge chopper circuit 8 through an adjustable constant-current DC-DC converter 7;
the transmission controller 6 is used for receiving system parameters and controlling transmission parameters;
the adjustable constant-current DC-DC converter 7 is used for voltage conversion under the control of the transmitting controller 6, and generates constant current to drive the H-bridge chopper circuit 8 to introduce transmitting current to the transmitting coil 4;
the H-bridge chopper circuit 8 is driven by the adjustable constant-current DC-DC converter 7 and outputs a certain waveform emission current;
the current sensor 5 is used for detecting the magnitude of the emission current and transmitting a signal to the emission controller 6 for emission current regulation and control;
the receiver is formed by connecting a first preamplifier 9 with a data acquisition card 15 through a first signal conditioning module 12, connecting a second preamplifier 10 with the data acquisition card 15 through a second signal conditioning module 13, connecting a third preamplifier 11 with the data acquisition card 15 through a third signal conditioning module 14, bidirectionally connecting the data acquisition card 15 with a receiving controller 16 and an upper computer 17, and connecting the upper computer 17 with a transmitting controller 6 through the receiving controller 16; the receiving channel A is formed by connecting a preamplifier 9 and a signal conditioning module 12; the receiving channel B is formed by connecting a preamplifier 10 and a signal conditioning module 13;
the first preamplifier 9, the second preamplifier 10 and the third preamplifier 11 are all used for amplifying TEM electric signals generated by the z-component receiving coil 1, the y-component receiving coil 3 and the x-component receiving coil 2 respectively;
the first signal conditioning module 12, the second signal conditioning module 13 and the third signal conditioning module 14 are respectively used for converting the differential electrical signals output by the first preamplifier 9, the second preamplifier 10 and the third preamplifier 11 into standard electrical signals which can be identified by the acquisition card 15;
the data acquisition card 15 is used for converting the conditioned analog electric signals into digital electric signals and transmitting the digital electric signals to the upper computer 17;
the receiving controller 16 is used for sending a synchronization signal, a control instruction and a system parameter to the transmitting controller 6;
the upper computer 17 is in communication connection with the receiving controller 16, displays the working state of the system and stores the measurement result of the system;
the coil is composed of a transmitting coil 4, a z component receiving coil 1, a y component receiving coil 3 and an x component receiving coil 2;
the z-component receiving coil 1 is eccentrically laid on a 20cm high platform across the transmitting line of the transmitting coil 4, the x-component receiving coil 2 is vertically laid on the ground and is horizontally spaced from the transmitting coil 4 by 20cm, and the central line of the x-component receiving coil 2 is required to be superposed with the central line of the x axis of the transmitting coil 4; the y component receiving coil 3 is laid on the rear side of the platform of the towing vehicle and is horizontally away from the transmitting coil 4 by 20cm, and the central line of the y component receiving coil 3 is required to be coincident with the central line of the y axis of the transmitting coil 4;
the x-component receiving coil 2 is used for acquiring geological body information of an x-component of a secondary field signal, the receiving coil 3 is used for acquiring geological body information of a y-component of the secondary field signal, and the z-component receiving coil 1 is used for acquiring geological body information of a z-component of the secondary field signal and is laid at a position 20cm away from a transmitting line of the transmitting coil 4, so that the coupling of the transmitting coil 4 with the z-component receiving coil 1, the y-component receiving coil 3 and the x-component receiving coil 2 can be weakened, the magnetic field change degree at the position is relatively smooth, and the adjustment of a primary field self-compensation effect can be performed with higher precision;
furthermore, the side length or diameter range of the transmitting coil 4 is 0.5m-5m, and the side length or diameter range of the z component receiving coil 1, the y component receiving coil 3 and the x component receiving coil 2 is 0.1m-1 m;
the compensation effect is that when the received signal is less than the system background noise V1When the current reaches the required primary field compensation precision, considering that the required primary field compensation precision is reached;
a method of self-compensating three component towed transient electromagnetic surveying, as shown in figure 3, comprising the steps of:
1) laying a transmitting coil 4, a z component receiving coil 1, an x component receiving coil 2 and a y component receiving coil 3 on a towing vehicle platform and a 20cm high platform;
2) adjusting the positions of the z component receiving coil 1, the x component receiving coil 2 and the y component receiving coil 3 to complete compensation of a primary field, and fixing the positions of the z component receiving coil 1, the x component receiving coil 2 and the y component receiving coil 3;
3) exciting and collecting according to the set system parameters, and the intensity of the current led into the transmitting coil 4 is ITCurrent frequency of foAnd synchronously receiving the secondary field signal of the transient electromagnetic wave.
Step 1) coil laying:
1a) and the transmitting coil 4 is laid: on the platform of the towing vehicle, the length of the parallel ground laying side is LTThe number of turns is NTThe transmitting coil 4;
1b) z-component receiving coil 1: the length of the side is L when the emitting line is laid on a high platform which is 20cm away from the towing vehicle platform and is parallel to the groundRThe number of turns is NRThe z-component receiving coil 1;
1c) x-component receiving coil 2 laying: the length of the side perpendicular to the ground is L at the position 20cm away from the emission line on the right side of the towing vehicle platformRThe number of turns is NRThe x component receiving coil 2 requires that the central line of the x component receiving coil 2 is coincident with the central line of the x axis of the transmitting coil 4, and the initial position of the x component receiving coil 2 is up-down symmetrical about the transmitting coil 4;
1d) y-component receiving coil 3 is laid: the length of the side perpendicular to the ground is L at the position which is 20cm away from the emission line and behind the towing vehicle platformRThe number of turns is NRThe y-component receiving coil 3, the central line of the y-component receiving coil 3 is required to be coincident with the central line of the y-axis of the transmitting coil 4;
as shown in fig. 4, step 2) system receiving coil position adjustment z component receiving coil 1 initial position is symmetrical up and down about transmitting coil 4:
2a) introducing 1KHz and 1A sinusoidal currents into the transmitting coil 4 through a transmitter, observing a received signal through an upper computer 17, respectively determining the compensation effect of the z component receiving coil 1, the x component receiving coil 2 and the y component receiving coil 3, and carrying out corresponding position adjustment; the position adjustment of the z-component receiving coil 1 is first performed: the upper computer 17 is used for detecting whether the receiving signal of the z component receiving coil is larger than the system background noise V1If not greater than the system noise floor V1Then, the complete compensation of the primary field is realized, and the 1 bit of the z component receiving coil is fixedIf the received signal is larger than the background noise V1Moving the z-component receiving coil 1 to the inner direction of the transmitting coil 4 by 0.5cm from the initial position, if the received signal is reduced, continuing to move to the inner direction of the transmitting coil 4 until the received signal of the z-component receiving coil 1 is less than the background noise V1Fixing the position of the z-component receiving coil 1, if the received signal is increased, moving the z-component receiving coil 1 to the external direction of the transmitting coil 4 until the received signal of the z-component receiving coil 1 is less than the background noise V1Fixing the position of the z-component receiving coil 1;
2b) x-component receiving coil 2 position adjustment: observing whether the received signal of the x component receiving coil 2 is larger than the system background noise V through the upper computer 171If not greater than the system noise floor V1Then the position of the x component receiving coil 2 is fixed, if the received signal is larger than the background noise V1Moving the receiving coil 2 vertically upward by 0.5cm from the initial position, and if the received signal is reduced, continuing moving vertically upward until the received signal of the x-component receiving coil 2 is less than the background noise V1Fixing the position of the x-component receiving coil 2, if the received signal is increased, moving the x-component receiving coil 2 vertically downwards until the received signal of the x-component receiving coil 2 is less than the background noise V1Fixing the x component receiving coil 2 position;
2c) y-component receiving coil 3 position adjustment: similarly, the position adjustment process of the y-component receiving coil 3 is the same as that of the x-component receiving coil 2;
as shown in fig. 5, step 3) the system excitation and acquisition process:
3a) and system parameter sending: if the preset parameters are used, the upper computer 17 of the system sends system parameters such as excitation instructions to the transmitting controller 6 through the receiving controller 16, the receiving controller 16 sends the acquisition instructions to the data acquisition card 15, if the preset parameters are not used, the upper computer 17 sends system parameters such as excitation instructions to the transmitting controller 6 through the receiving controller 16 after the parameters are manually input, the receiving controller 16 sends the acquisition instructions to the data acquisition card 15, and the system parameters comprise the sampling rate fsWhether to use GPS and the number of superpositionNumber n, emission current intensity ITFrequency f of emission current0；
3b) And primary field excitation secondary field acquisition: the receiving controller 16 sends a synchronous signal to the transmitting controller 6 and the data acquisition card 15, and if the transmitting controller 6 detects the synchronous signal, the adjustable cross current DC-DC converter 7 controls the H-bridge chopper circuit 8 to excite the transmitting coil 4 with current intensity ITCurrent frequency of f0If the transmitting controller 6 does not detect the synchronous signal, the receiving controller 16 sends error information to the upper computer 17, and the whole system process is ended;
the z component receiving coil 1 sends a secondary field signal to a data acquisition card 15 for acquisition through a preamplification circuit 9 and a signal conditioning module 12, the receiving coil 2 sends a secondary field signal to a signal conditioning module 13 through a preamplification circuit 10, and the receiving coil 3 sends a secondary field signal to an upper computer 17 for storage and display through a preamplification circuit 11 and a signal conditioning module 14;
3c) and superposition measurement: and repeatedly executing the 3b flow according to the set superposition times until the completion.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A self-compensating three-component towed transient electromagnetic survey apparatus, comprising: the system comprises a towing vehicle platform and a high platform arranged on the towing vehicle platform, wherein the towing vehicle platform and the high platform are laid in parallel, and a z-component receiving coil is laid on the high platform; the system comprises a transmitter coil, an x component receiver coil and a y component receiver coil, wherein the transmitter coil, the x component receiver coil and the y component receiver coil are laid on a trailer platform, the x component receiver coil is laid on the rear side of the trailer platform in the driving direction perpendicular to the ground, the y component receiver coil is laid on the right side of the trailer platform in the driving direction perpendicular to the ground, and the central line of the x component receiver coil in the x direction is superposed with the central line of the transmitter coil in the x axis; the center line of the y component receiving coil in the y direction is superposed with the center line of the y axis of the transmitting coil, the x direction, the y direction and the z direction are mutually orthogonal, the advancing direction of the trailer is the y direction, and the direction vertical to the trailer is the z direction;
the initial position of the z-component receiving coil is symmetrical on the plane parallel to the plateau left and right about one side of the transmitting coil parallel to the advancing direction, the initial position of the x-component receiving coil is symmetrical on the side of the transmitting coil perpendicular to the advancing direction up and down, and the initial position of the y-component receiving coil is symmetrical on the side of the transmitting coil parallel to the advancing direction up and down.
2. The apparatus of claim 1, wherein the z-component receiver coil is placed off-center across the transmit line of the transmitter coil on a 20-30cm plateau from the tow vehicle platform.
3. The apparatus of claim 1, wherein the x-component receiver coil and the y-component receiver coil are horizontally spaced from a side of the transmitter coil by 20-30 cm.
4. A method of self-compensating three component towed transient electromagnetic surveying, the method comprising:
1) laying coils: the system comprises a towing vehicle platform and a high platform arranged on the towing vehicle platform, wherein the towing vehicle platform and the high platform are laid in parallel, and a z-component receiving coil is laid on the high platform; the system comprises a transmitter coil, an x component receiver coil and a y component receiver coil, wherein the transmitter coil, the x component receiver coil and the y component receiver coil are laid on a trailer platform, the x component receiver coil is laid on the rear side of the trailer platform in the driving direction perpendicular to the ground, the y component receiver coil is laid on the right side of the trailer platform in the driving direction perpendicular to the ground, and the central line of the x component receiver coil in the x direction is superposed with the central line of the transmitter coil in the x axis; the center line of the y component receiving coil in the y direction is superposed with the center line of the y axis of the transmitting coil, the x direction, the y direction and the z direction are mutually orthogonal, the advancing direction of the trailer is the y direction, and the direction vertical to the trailer is the z direction; the initial position of the z-component receiving coil is symmetrical on a plane parallel to the plateau left and right relative to one side of the transmitting coil parallel to the advancing direction, the initial position of the x-component receiving coil is symmetrical on the side of the transmitting coil perpendicular to the advancing direction up and down, and the initial position of the y-component receiving coil is symmetrical on the side of the transmitting coil parallel to the advancing direction up and down;
2) adjusting the position of a receiving coil: introducing 1KHz and 1A sinusoidal currents into the transmitting coil through the transmitter, observing a received signal through the upper computer, respectively determining the compensation effects of the x-component receiving coil, the y-component receiving coil and the z-component receiving coil, and performing corresponding position adjustment;
3) and excitation and collection are carried out, the transmitter transmits bipolar rectangular waves through the transmitting coil, and the receiver detects secondary field signals through the x-component receiving coil, the y-component receiving coil and the z-component receiving coil.
5. The method of claim 4, wherein step 1) coil laying comprises: and the z-component receiving coil is eccentrically laid on a high platform which is 20-30cm away from the towing vehicle platform across the transmitting line of the transmitting coil.
6. The method of claim 4, wherein the x-component receiver coil and the y-component receiver coil are horizontally spaced from a side of the transmitter coil by 20-30 cm.
7. The method of claim 4, wherein the step 2) receive coil position adjustment comprises:
performing z-component receive coil position adjustment: observing whether the received signal of the z-component receiving coil is larger than the system background noise V through an upper computer1If not greater than the system noise floor V1Fixing the position of the z-component receiving coil, and if the received signal is larger than the background noise V1Moving the z-component receiving coil 0.5cm from the initial position to the internal direction of the transmitting coil, if the received signal is reduced, continuing to move to the internal direction of the transmitting coil until the received signal of the z-component receiving coil is less than the background noise V1Fixing the position of the z-component receiving coil, if the received signal is increased, moving the z-component receiving coil to the external direction of the transmitting coil until the received signal of the z-component receiving coil is less than the background noise V1Is fixed toA z-component receive coil position;
x-component receive coil position adjustment: observing whether the received signal of the x-component receiving coil is larger than the system background noise V through an upper computer1If not greater than the system noise floor V1Fixing the position of the x component receiving coil, and if the received signal is larger than the background noise V1Moving the x-component receiving coil vertically and upwardly by 0.5cm from the initial position, if the received signal is reduced, continuing to move vertically and upwardly until the received signal of the x-component receiving coil is less than the background noise V1Fixing the position of the x-component receiving coil, if the received signal is increased, moving the x-component receiving coil vertically downwards until the received signal of the x-component receiving coil is less than the background noise V1Fixing the x component receiving coil position;
the y-component receive coil position is adjusted in accordance with the x-component receive coil adjustment process.
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