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WO2018126808A1 - Procédé et dispositif de réception à couplage lâche d'un champ primaire recherché par un procédé électromagnétique - Google Patents

Procédé et dispositif de réception à couplage lâche d'un champ primaire recherché par un procédé électromagnétique Download PDF

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Publication number
WO2018126808A1
WO2018126808A1 PCT/CN2017/112273 CN2017112273W WO2018126808A1 WO 2018126808 A1 WO2018126808 A1 WO 2018126808A1 CN 2017112273 W CN2017112273 W CN 2017112273W WO 2018126808 A1 WO2018126808 A1 WO 2018126808A1
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WIPO (PCT)
Prior art keywords
coil
receiving
transmitting
receiving coil
mth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/CN2017/112273
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English (en)
Chinese (zh)
Inventor
付志红
王浩文
秦善强
王耀
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chongqing Triloop Prospecting Technology Co Ltd
Chongqing University
Original Assignee
Chongqing Triloop Prospecting Technology Co Ltd
Chongqing University
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Application filed by Chongqing Triloop Prospecting Technology Co Ltd, Chongqing University filed Critical Chongqing Triloop Prospecting Technology Co Ltd
Publication of WO2018126808A1 publication Critical patent/WO2018126808A1/fr
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Ceased legal-status Critical Current

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    • G—PHYSICS
    • 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
    • G01V3/10—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 using induction coils
    • G01V3/104—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 using induction coils using several coupled or uncoupled coils

Definitions

  • the invention relates to the technical field of electromagnetic method exploration, in particular to a field weak coupling receiving device and method for electromagnetic method exploration.
  • Electromagnetic exploration has been widely used in mineral exploration, engineering geological exploration, groundwater resources, underground pipelines and environmental geological exploration. Among them, frequency domain electromagnetic method and time domain electromagnetic method are commonly used, and electromagnetic transmitter is used to generate excitation field. The secondary field induced by the geological body is collected by the receiver, and the structure of the geological body is detected by analyzing the secondary field.
  • electromagnetic exploration still has the following disadvantages: 1. There is mutual inductance between the transmitting coil and the receiving coil, and the signal sensed by the receiving coil not only has the secondary field signal collected by the receiver, but also has electromagnetic transmission. The machine generates the excitation primary field, and there is a problem of primary field and secondary field aliasing. 2. Since the amplitude of the primary field signal is large and the amplitude of the secondary field is small, it is very difficult to distinguish the secondary field in the background of one field. The receiving signal has a large fluctuation range and is difficult to receive the secondary field signal. 3. The conventional small wire frame same-point device has a large number of transmitting and receiving coils, and the mutual inductance is strongly affected.
  • the conventional small wire frame and the same point device have poor reliability, and it is difficult to obtain practical application;
  • the transmission and reception are relatively independent of the two systems.
  • the relative position of the exploration is uncertain, the mutual inductance changes greatly, the distortion of the signal is uncertain, and the error of the detection data is large, and the use is inconvenient.
  • the patent authorization number is ZL200720151836.7 "a transient electromagnetic instrument", which can eliminate the influence of the field during the power supply and after a short time after the shutdown, but after the switch is switched, the mutual inductance still exists, and there is still a signal mixture.
  • the stacking problem uses four switches, the structure is complicated, and the switching of the switch has an adverse effect on the received signal. 5.
  • the patent transmission authorization number is 2010101145349 "An integrated method and device for transmitting and receiving electromagnetic surveys" can achieve the elimination of one field by adjusting the number of turns of the receiving coils disposed inside and outside the transmitting coil, but this adjustment mode relies on The combination of the number of turns is prone to non-integer ⁇ , resulting in lower accuracy of the primary field elimination, and the concentrated winding of the receiving coil has a large self-inductance, which easily causes distortion of the received signal. Summary of the invention
  • the present invention provides an apparatus and method for transmitting and receiving integrated for electromagnetic method exploration, which cancels the mutual inductance effect between the transmitting coil and the receiving coil, and eliminates the influence of the excitation primary field generated by the electromagnetic transmitter.
  • a field weak coupling receiving device for electromagnetic method exploration comprising a transmitter, a transmitting coil, a signal conditioning module and a receiver, wherein two transmitting output ends of the transmitter are connected with two ends of the transmitting coil, and the key thereof
  • the method further includes: n receiving coils, the n receiving coils constitute a receiving coil module, the receiving coil module is connected to the signal conditioning module, and the signal conditioning module output end group is connected to the receiver;
  • a receiving coil module is disposed at an edge of the transmitting coil, the two of which partially intersect, a partial orthographic projection of the transmitting coil and a partial orthographic projection of the receiving coil module coincide.
  • the transmitting coil is either circular or square or elliptical or a polygonal coil.
  • the receiving coil is either square or elliptical or polygonal or circular.
  • the magnetic flux emitted by the transmitting coil passing through the receiving coil module receiving coil is adjustable.
  • the area of the intersection area between the receiving coil and the transmitting coil can be adjusted, or the relative heights of the receiving coil and the transmitting coil can be adjusted.
  • the receiving coil module is a receiving coil array, and the receiving coil array is composed of n independent working n receiving coils, and all receiving coil wires are wound in the same direction.
  • the n receiving coils are independent of each other, complement each other, and receive each. The independent effect is good and the mutual interference is small.
  • the signal conditioning module comprises n independent signal conditioning circuits, each of the receiving coil is connected to a separate signal conditioning circuit, the starting end of the receiving coil corresponding to A m and the signal conditioning circuit being The input terminal is connected, and the receiving coil end terminal B m is connected to a reference end corresponding to the signal conditioning circuit.
  • the signals received by the n receiving coils are processed by n independent signal conditioning circuits.
  • the signal conditioning module includes a signal conditioning circuit, and all of the receiving coils are sequentially connected in series, wherein a starting end A 1 of the first receiving coil is connected to a positive input end of the signal conditioning circuit, The end receiving end point B n of the receiving coil is connected to a reference end corresponding to the signal conditioning circuit.
  • n receiving coils are sequentially connected in series, disposed at the edge of the transmitting coil, and the n receiving coils are subjected to receiving signal adjustment by a signal conditioning circuit, and the signal processing is simple and convenient.
  • n 1 of the receiving coils are uniformly disposed at an edge of the transmitting coil (2), and the n 1 receiving coils partially intersect with the transmitting coil (2);
  • n 2 receiving coils are completely located in the transmitting coil (2);
  • the receiving coil is a strip coil
  • the strip coil is annular, and is disposed around the edge of the transmitting coil, the two portions are partially intersected, and part of the orthographic projection of the transmitting coil and a portion of the strip coil are positive The projections coincide.
  • the receiving coil is wound into a strip shape by a wire, and the inner coil portion of the strip coil is disposed in the transmitting coil, and the outer ring portion is disposed outside the transmitting coil, by adjusting the overlapping portion of the strip coil and the transmitting coil. Adjust the size of the magnetic flux.
  • the signal conditioning circuit includes a damping resistor R 0 , a voltage follower A 1 , an operational amplifier A 2 , an input resistor R 1 and a feedback resistor R 2 ; one end of the damping resistor R 0 serves as the signal conditioning end of the reference circuit, the reference end, the noninverting input damping resistor R 0 and the other end of the voltage follower a 1 is connected to the noninverting input of voltage follower a 1 as the signal conditioning a positive input terminal, an output of the voltage follower A 1 is connected to the inverting input terminal of the voltage follower A 1 ; an output end of the voltage follower A 1 is connected to one end of the input resistor R 1
  • the other end of the input resistor R 1 is connected to the inverting input terminal of the operational amplifier A 2 , the non-inverting input terminal of the operational amplifier A 2 is connected to the reference terminal, and the output terminal of the operational amplifier A 2 is said feedback resistor R 2 is connected to the inverting input terminal a 2 of
  • the signal conditioning circuit processes the signal received by the receiving coil.
  • An independent exploration method for a field weakly coupled receiving device for electromagnetic surveying comprises the following steps:
  • N 1 total number of turns of the transmitting coil
  • N m total number of turns of the mth receiving coil
  • the structural specification should add that each coil can be single or multiple turns
  • k summation variable of the transmitting coil
  • i summation variable of the mth receiving coil
  • i(t) the current through which the transmitting coil passes
  • ⁇ mki the angle between the i-th coil plane of the mth receiving coil and the normal direction of the kth coil of the transmitting coil
  • l 1k the path of the kth coil of the transmitting coil
  • the mth receiving coil, the i-th coil plane, and the transmitting coil 1, the kth coil element vector Relative position vector
  • R mki a certain point of the mth receiving coil, the i-th coil plane, and the k-th coil element vector of the transmitting coil 1 a mode of the relative position vector
  • S mi a planar range of the mth receiving coil of the i-th coil; a plane bin vector of the i-th coil of the mth receiving coil;
  • B(t) secondary field magnetic induction
  • S mi area of the i-th coil of the mth receiving coil
  • ⁇ mi direction of the first direction of the coil and the direction of the secondary field magnetic induction of the coil
  • a field induced voltage between the start and end points of the mth receiving coil a field induced voltage between the start and end points of the mth receiving coil
  • a series exploration method for a field weakly coupled receiving device for electromagnetic surveying comprises the following steps:
  • N 1 total number of turns of the transmitting coil
  • N m total number of turns of the mth receiving coil
  • the structural specification should add that each coil can be single or multiple turns
  • k summation variable of the transmitting coil
  • i summation variable of the mth receiving coil
  • i(t) the current through which the transmitting coil passes
  • ⁇ mki the angle between the i-th coil plane of the mth receiving coil and the normal direction of the kth coil of the transmitting coil
  • l 1k the path of the kth coil of the transmitting coil
  • the mth receiving coil, the i-th coil plane, and the transmitting coil 1, the kth coil element vector Relative position vector
  • R mki a certain point of the mth receiving coil, the i-th coil plane, and the k-th coil element vector of the transmitting coil 1 a mode of the relative position vector
  • S mi a planar range of the mth receiving coil of the i-th coil; a plane bin vector of the i-th coil of the mth receiving coil;
  • B(t) secondary field magnetic induction
  • S mi area of the i-th coil of the mth receiving coil
  • ⁇ mi direction of the first direction of the coil and the direction of the secondary field magnetic induction of the coil
  • a field induced voltage between the start and end points of the mth receiving coil a field induced voltage between the start and end points of the mth receiving coil
  • the invention has the beneficial effects that the field magnetic flux cancellation is realized on each receiving coil by adjusting the relative arrangement positions of the receiving coil and the transmitting coil, thereby eliminating the phenomenon of the primary field and the secondary field aliasing of the conventional receiving coil; Conventional receiving coil primary field and secondary field aliasing phenomenon, the dynamic range of the received signal is reduced, solving the problem of receiving weak secondary field signal; wide application range; integrated system, easy to use; convenient operation, accurate and reliable adjustment effect .
  • FIG. 1 is a block diagram showing the structure of a first system series coil of the present invention
  • Figure 2 is a block diagram showing the structure of the independent coil of the second system of the present invention.
  • FIG. 3 is a circuit schematic diagram of a detecting device composed of a series receiving coil of the present invention.
  • Figure 4 is a circuit diagram of a detecting device composed of a strip-shaped receiving coil of the present invention.
  • Figure 5 is a vector diagram of the calculation of the primary field flux of the present invention.
  • Figure 6 is a vector diagram of the calculation of the secondary field flux of the present invention.
  • FIG. 7 is a schematic circuit diagram of a spiral coil transmitting and receiving integrated device of the present invention.
  • Figure 8 is a waveform diagram of currents passed by the time domain electromagnetic method transmitting coil of Figure 7;
  • Figure 9 is a waveform diagram of the induced voltage of the time domain electromagnetic receiving coil of Fig. 7 and the induced voltage of the receiving coil n;
  • Figure 10 is a voltage waveform diagram of the induced voltage of the time domain electromagnetic receiving coil of Fig. 7 and the end point of the receiving coil group;
  • Figure 11 is a waveform diagram of currents passed through the frequency domain electromagnetic transmitting coil of Figure 7;
  • Figure 12 is a waveform diagram of the induced voltage of the frequency domain electromagnetic receiving coil of Fig. 7 and the induced voltage of the receiving coil n;
  • Figure 13 is a voltage waveform diagram of the induced voltage of the frequency domain electromagnetic receiving coil of Figure 7 and the end of the receiving coil group;
  • Figure 14 is a schematic circuit diagram of a square coil transmitting and receiving integrated device of the present invention.
  • Figure 15 is a current waveform diagram of the passage of the time domain electromagnetic method transmitting coil of Figure 14;
  • Figure 16 is a waveform diagram of the induced voltage of the time domain electromagnetic receiving coil of Fig. 14 and the induced voltage of the receiving coil n;
  • Figure 17 is a voltage waveform diagram of the induced voltage of the time domain electromagnetic receiving coil of Fig. 14 and the end point of the receiving coil group;
  • Figure 18 is a circuit diagram of the hexagonal coil transmitting and receiving integrated device of the present invention.
  • Figure 19 is a schematic circuit diagram of an elliptical coil transmitting and receiving integrated device of the present invention.
  • Figure 20 is a graph showing the comparison of induced voltages of distributed and single receiving coils of the present invention.
  • transmitter 2. transmitting coil, 3. receiving coil module, 4. signal conditioning module, 5. receiver;
  • the transmitting coil passes the forward current i(t) counterclockwise, and the symbol ' ⁇ ' in the outer receiving coil region indicates that the magnetic induction direction is from the paper inward, and the ' ⁇ ' in the inner receiving coil region indicates that the magnetic induction direction is from the paper direction. outer.
  • a field weak coupling receiving apparatus and method for electromagnetic method exploration including a transmitter 1 and a transmission a coil 2, a signal conditioning module 4 and a receiver 5, the two transmission outputs of the transmitter 1 being connected to both ends of the transmitting coil 2, further comprising n receiving coils, the n receiving coils forming a receiving coil Module 3, the receiving coil module 3 is connected to the signal conditioning module 4, and the output processing group of the signal conditioning module 4 is connected to the receiver 5;
  • the receiving coil module 3 is disposed at an edge of the transmitting coil 2, partially overlapping, and a partial orthographic projection of the transmitting coil 2 coincides with a partial orthographic projection of the receiving coil module 3.
  • the transmitting coil is either circular or square or elliptical or a polygonal coil
  • the receiving coil is either circular or square or elliptical or a polygonal coil.
  • the transmitting coil is a circular coil.
  • the transmitting coil is a square coil
  • the receiving coil is a square coil; as can be seen from Fig. 18, the transmitting coil is a polygonal coil, and the receiving coil is a square coil; as can be seen from Fig. 19, the transmitting coil is elliptical.
  • the coil and the receiving coil are circular coils.
  • the n receiving coils are located in the same plane and at a certain distance from the transmitting coil.
  • the size of the magnetic flux emitted by the transmitting coil 2 passing through the receiving coil module 3 is adjustable, and the relative height of the receiving coil and the transmitting coil 2 can be adjusted by changing the area of the intersection area.
  • the receiving coil module 3 is a receiving coil array, which is composed of n independent working n receiving coils, and all receiving coil wires are wound in the same direction.
  • the signal conditioning module 4 comprises n independent signal conditioning circuits, each of the receiving coil is connected to a separate signal conditioning circuit, said positive input terminal receiving coil corresponding to the start point to the end of A m and the signal conditioning circuit is connected to The receiving coil end point B m is connected to a reference end corresponding to the signal conditioning circuit.
  • the signal conditioning module (4) includes a signal conditioning circuit, and all of the receiving coils in series, where the starting point of the first end a receiving coil 1 is connected to the positive input terminal of said signal conditioning circuit, receiving said endmost side coil end B n corresponding to the reference terminal is connected to the signal conditioning circuit.
  • the receiving coil is a strip coil, the strip coil is annular, and is disposed around the edge of the transmitting coil 2, the two portions are partially overlapped, a partial orthographic projection of the transmitting coil 2 and a partial orthographic projection of the strip coil coincide. See Figure 4 for details.
  • the signal conditioning circuit includes a damping resistor R 0 , a voltage follower A 1 , an operational amplifier A 2 , an input resistor R 1 and a feedback resistor R 2 ;
  • damping resistor R 0 serves as a reference end of the signal conditioning circuit, the reference terminal is grounded, and the other end of the damping resistor R 0 is connected to the non-inverting input terminal of the voltage follower A 1 .
  • follow-inverting input terminal a is a signal conditioning circuit as the positive input, the output of voltage follower a voltage follower a and the inverting input terminal of a connection 1; the output of voltage follower a 1 end of the input end of the resistor R 1 is connected to the inverting input terminal of the input resistor R 1 and the other end of the operational amplifier a 2 is connected to the positive input of the operational amplifier a 2 of said reference termination terminal, the output terminal of the operational amplifier a 2 is connected via the 2 and a 2 of the inverting input terminal of the operational amplifier feedback resistor R, the output of the operational amplifier a 2 and the receiver 5 a positive input
  • the terminal is connected, and the reference end of the signal conditioning circuit is connected to the common reference terminal of the receiver 5.
  • the serial exploration method includes the following steps:
  • B(t) secondary field magnetic induction
  • S mi area of the i-th coil of the mth receiving coil
  • ⁇ mi direction of the first direction of the coil and the direction of the secondary field magnetic induction of the coil
  • a field induced voltage between the start and end points of the mth receiving coil a field induced voltage between the start and end points of the mth receiving coil;
  • the secondary field induced voltage between the start and end points of the mth receiving coil The secondary field induced voltage between the start and end points of the mth receiving coil
  • u(t) is an induced voltage generated by the transmitting coil and the receiving coil
  • u 0 (t) is an amplified voltage of u(t)
  • its amplification factor is R 2 /R 1 .
  • FIG. 5 when the kth coil of the transmitting coil 2 passes the current i(t), a vector diagram of the first field flux of the i-th coil of the inner receiving coil and the j-th coil of the outer receiving coil is calculated;
  • i(t) the current through which the transmitting coil passes
  • ⁇ 2ki the angle between the i-th coil plane of the receiving coil and the normal direction of the k-th coil of the transmitting coil
  • l 1k the path of the k-th coil of the transmitting coil; a line element vector on the kth coil of the transmitting coil; a point at the i-th coil plane of the receiving coil and a k-th coil element vector of the transmitting coil Relative position vector
  • ⁇ nki the angle between the j-th coil plane of the receiving coil and the normal direction of the k-th coil of the transmitting coil
  • l nk the path of the k-th coil of the transmitting coil; a point of the j-th coil of the receiving coil and a k-th coil element vector of the transmitting coil Relative position vector between.
  • FIG. 6 a vector diagram for calculating a second field flux of the ith coil of the receiving coil m is calculated
  • B(t) secondary field magnetic induction
  • S mi area of the first coil of the receiving coil m
  • l mi path of the first coil of the receiving coil m
  • ⁇ m the angle between the normal direction of the ith coil of the receiving coil m and the direction of the secondary field magnetic induction intensity
  • Embodiment 1 applied to the time domain electromagnetic method, is performed in the following sequence steps:
  • the plane selects the center point O
  • the design transmitting coil 2 is a 20-inch planar spiral coil, and each coil is approximately a circle; the innermost coil has a radius of 400 mm, the outermost coil has a radius of 460 mm, and the line width is 2.5 mm. , the distance between lines is 0.5mm;
  • Each sub-receiving coil is designed to be a 300-turn spiral coil, and each turn coil is approximately a circle; the innermost coil has a radius of 100.5 mm, the outermost coil has a radius of 120.5 mm, the line width is 0.5 mm, and the line-to-line distance is 0.5.
  • each cell is 0.02 ms; the vertical axis is current, each cell is 1 A; the signal is the transmission current in Embodiment 1, and the current is transmitted. Frequency is 32Hz, the current is sent by current sensing The current measurement has a conversion ratio of 100mV/A, so the peak value of the transmission current is 7.1A.
  • the above figure shows the induced voltage generated by the receiving coil.
  • the transmitting current i(t) is positively decreased and turned off.
  • the induced voltage of the receiving coil is shown.
  • the horizontal axis is time t, each cell is 20 ⁇ s, and the vertical axis is voltage, and each cell is 10 mV.
  • the following figure shows the voltage output from the receiving coil group; the transmitting current i(t) is forward-decreasing and the switching-off starts, and the receiving coil group output voltage
  • the horizontal axis is time t, each cell is 20 ⁇ s, and the vertical axis is voltage, and each cell is 50 mV.
  • the device of the present invention receives the signal of the primary field very small, eliminating the strong primary field background, and achieving the purpose of effectively receiving the secondary field transient signal generated by the underground geological body.
  • Embodiment 2 applied to the frequency domain electromagnetic method, is performed in the following sequential steps;
  • the transmitting coil and the receiving coil group designed in Embodiment 1 are obtained according to the second step of Embodiment 1.
  • the signal is the transmission current in the second embodiment, the frequency of the transmission current is 10000 Hz, and the transmission current is measured by the current sensor.
  • the conversion ratio of the current sensor is 100 mV/A, so the peak value of the transmission current is 5.8 A.
  • Approximate sinusoidal current expression: i(t) 5.5 ⁇ cos(20000 ⁇ t)(A);
  • the above figure is the second embodiment, the transmission current i(t) starts to turn off, and the induced voltage of the receiving coil
  • the following figure shows the induced voltage of the receiving coil n starting from the forward turn-off of the transmitting current i(t) in the second embodiment.
  • the above figure shows the induced voltage generated by the receiving coil.
  • the following figure shows the voltage u 0 (t) after the output voltage u(t) of the receiving coil group is amplified by 1 time;
  • the primary field signal received by the device of the present invention is weak, eliminating the strong primary field background.
  • Embodiment 3 applied to the time domain electromagnetic method, is performed in the following sequence steps:
  • the design transmission coil 2 is a 20-inch square solenoid; the square side length is 300 mm, the line width is 2 mm, and the line-to-line distance is 3 mm;
  • the design sub-receiving coil is a 300-inch square solenoid; the square side length is 110 mm, the line width is 2 mm, and the line-to-line distance is 1.8 mm;
  • l 1 the side length of each coil of the sub-receiving coil
  • x the x coordinate of a point of the i-th coil plane of the sub-receiving coil
  • y the y coordinate of a point of the i-th coil plane of the sub-receiving coil
  • z sub The z coordinate of a point on the i-th coil plane of the receiving coil
  • z k the z coordinate of a point on the k- th coil of the transmitting coil 1
  • the symbol appearing in the following formula has the same meaning
  • L the length of the side of the transmitting coil 1 , the symbol appearing in the following formula has the same meaning
  • the arc through which the current of one side of the coil 1 of the transmitting coil 1 passes, and the symbol appearing in the following formula has the same meaning
  • each cell is 0.02 ms; the vertical axis is current, and each cell is 1 A.
  • the current waveform is measured by a current sensor, and the conversion ratio of the current sensor is 100 mV/A, so the peak value of the transmission current is 7.1 A.
  • the transmission current off time is 30 ⁇ s;
  • the figure above shows the induced voltage of the receiving coil starting from the forward turn-off of the transmitting current i(t) in the third embodiment.
  • the following figure shows the induced voltage of the receiving coil n starting from the forward turn-off of the transmitting current i(t) in the third embodiment.
  • the above figure shows the induced voltage waveform generated by the receiving coil.
  • the following figure shows the voltage u(t) output from the receiving coil group.
  • the technical solution of the invention is not only suitable for geophysical exploration, engineering geological exploration, but also for detecting underground military targets and non-destructive testing.
  • Embodiment 4 applied to the time domain electromagnetic method, is performed in the following sequence steps:
  • the design transmission coil is a 20-inch planar spiral coil, each coil is approximately a circle; the innermost coil has a radius of 400 mm, the outermost coil has a radius of 460 mm, and the line width is 2.5 mm. , the distance between lines is 0.5mm;
  • each sub-receiving coil is a 300-turn spiral coil, each coil is approximately a circle; the innermost coil has a radius of 100.5 mm, and the outermost coil has a radius of 120.5 mm.
  • the width is 0.5mm, and the distance between lines is 0.5mm;
  • each coil is approximately a circle; the innermost coil has a radius of 100.5 mm, the outermost coil has a radius of 160.5 mm, the line width is 0.5 mm, and the line-to-line distance is 0.5 mm;
  • the solid line voltage curve is the output voltage of the distributed receiving coil, and the dotted line voltage curve is the voltage output by a single 2100 ⁇ receiving coil;
  • the self-inductance coefficient of the receiving coil group is only 427.1mH, which is much smaller than the self-inductance 2.0248H of the single effective coil of the same effective area, it has better signal sensitivity and is beneficial to realize the reception of the secondary generated by the underground geological body.
  • the purpose of the field transient signal is only 427.1mH, which is much smaller than the self-inductance 2.0248H of the single effective coil of the same effective area.

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  • Remote Sensing (AREA)
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  • Electromagnetism (AREA)
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Abstract

La présente invention concerne un procédé et un dispositif de réception à couplage lâche d'un champ primaire recherché par un procédé électromagnétique. Le dispositif comprend: un émetteur (1), une bobine d'émission (2), un module de conditionnement de signal (4) et un récepteur (5). Deux extrémités de sortie d'émission de l'émetteur (1) sont connectées aux deux extrémités de la bobine d'émission (2). Le dispositif comprend en outre n bobines de réception. Les n bobines de réception constituent un module de bobines de réception (3). Le module de bobines de réception (3) est connecté au module de conditionnement de signal (4). Le groupe d'extrémités de sortie du module de conditionnement de signal (4) est connecté au récepteur (5). Le module de bobines de réception (3) est disposé au niveau d'un bord de la bobine d'émission (2). Le module de bobines de réception (3) coupe partiellement la bobine d'émission (2). Une partie de la projection orthographique de la bobine d'émission (2) chevauche une partie de la projection orthographique du module de bobines de réception (3). Le repliement d'un champ primaire et d'un champ secondaire d'une bobine de réception classique est éliminé; la plage dynamique d'un signal de réception est réduite, et le problème lié à la difficulté de réception d'un signal d'un champ secondaire faible est résolu; la plage d'application est large; un système intégré et une utilisation pratique sont obtenus; un fonctionnement aisé et un effet de conditionnement précis et fiable sont obtenus.
PCT/CN2017/112273 2017-01-09 2017-11-22 Procédé et dispositif de réception à couplage lâche d'un champ primaire recherché par un procédé électromagnétique Ceased WO2018126808A1 (fr)

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Application Number Priority Date Filing Date Title
CN201710014564.4A CN106908845B (zh) 2017-01-09 2017-01-09 电磁法勘查的一次场弱耦合接收装置及方法
CN201710014564.4 2017-01-09

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111337988A (zh) * 2020-04-02 2020-06-26 中油奥博(成都)科技有限公司 井下时间域电磁多分量远探测仪器
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CN114814957A (zh) * 2022-04-15 2022-07-29 吉林大学 一种基于瞬变电磁法的平面梯度测量方法
CN116243391A (zh) * 2023-01-31 2023-06-09 哈尔滨工业大学重庆研究院 拉电传感控制的全航空电磁传感线圈面积调节自适应系统
CN119687799A (zh) * 2024-12-12 2025-03-25 厦门大学 基于单边时频谱的激光自混合干涉位移重建方法及装置

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CN112162323A (zh) * 2020-09-28 2021-01-01 长春工程学院 基于人工场源频率域电法的地下不良地质勘测方法及系统
CN112162323B (zh) * 2020-09-28 2024-03-08 长春工程学院 基于人工场源频率域电法的地下不良地质勘测方法及系统
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CN114814957A (zh) * 2022-04-15 2022-07-29 吉林大学 一种基于瞬变电磁法的平面梯度测量方法
CN116243391A (zh) * 2023-01-31 2023-06-09 哈尔滨工业大学重庆研究院 拉电传感控制的全航空电磁传感线圈面积调节自适应系统
CN119687799A (zh) * 2024-12-12 2025-03-25 厦门大学 基于单边时频谱的激光自混合干涉位移重建方法及装置

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