CN103837899B - A kind of Transient electromagnetic measure device and method - Google Patents
A kind of Transient electromagnetic measure device and method Download PDFInfo
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- CN103837899B CN103837899B CN201410092714.XA CN201410092714A CN103837899B CN 103837899 B CN103837899 B CN 103837899B CN 201410092714 A CN201410092714 A CN 201410092714A CN 103837899 B CN103837899 B CN 103837899B
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Abstract
The present invention relates to a kind of Transient electromagnetic measure device, including launch aerial coil, receiving antenna coil and Nulling antenna coil, three is parallel to each other；Launch aerial coil and Nulling antenna coil is serially connected；The magnetic flux making the primary field launching aerial coil and the generation of Nulling antenna coil combination pass through receiving antenna coil is consistently equal to 0 or close to 0, ensure the primary field intensity of receiving point lower sensing zone simultaneously, thus eliminate or weaken the sensing transient process that reception antenna produces when emission current turns off, it is greatly improved the secondary field Signal-to-Noise of the underground medium that reception antenna senses, it is achieved transient electromagnetic sounding in high precision.
Description
Technical field
The invention belongs to field of geophysical exploration, be specifically related to a kind of Transient electromagnetic measure device and method.
Background technology
Transient electromagnetic method is a kind of important method of field of geophysical exploration, according to the difference of the systemic vectors using, transient electromagnetic system, tunnel transient electromagnetic system and transient electromagnetic system waterborne in aviation transient electromagnetic system, half aviation transient electromagnetic system, ground transient electromagnetic system, well can be divided into.The method is passed through electric current in launching wire, launch primary field to target area, then moment turns off emission current, is turning off the secondary turbulence field that gap induces with antenna or earth electrode observed object Region Medium, and according to the electrical parameter distribution of this secondary field information acquisition target area medium.
Current transient electromagnetic fado uses a transmitting antenna, one or more reception antennas, uses and determines the devices such as source, Genter loop, Coincident loop, dipole greatly.Owing to launching the coupling effect of antenna and reception antenna, after shut-off, the induction field of reception antenna itself will continue a longer transient process, the induction field of period reception antenna itself is together with the secondary field Signal averaging that underground senses, causing the secondary field signal distortion that underground senses, signal to noise ratio is low.Roadmap to this problem at present: one is the inductance of regulation reception antenna on hardware, electric capacity, build-out resistor, makes sensor be in Critical damping state, to reduce the induction field of reception antenna itself；Two be on data are processed, the induced voltage of actual measurement is converted to magnetic field after, then deduct the primary field that emission current change produces, or ask for the rate of change of primary field during switch off current, deduct the rate of change of primary field with the induced voltage of actual measurement.On hardware, Optimum Matching can to a certain degree reduce the induction field of reception antenna self, but complex disposal process；Data processing method theory is feasible, and actual being difficult to operates.
Content of the invention
It is an object of the invention to provide the Transient electromagnetic measure device and method of a kind of transient process that can effectively eliminate or significantly weaken the induction field of reception antenna own.
The Transient electromagnetic measure device that the present invention provides, including launch aerial coil, receiving antenna coil and Nulling antenna coil, three is parallel to each other；Launch aerial coil and Nulling antenna coil is serially connected；The magnetic flux making the primary field launching aerial coil and the generation of Nulling antenna coil combination pass through receiving antenna coil is consistently equal to 0 or close to 0.
Described Nulling antenna coil, receiving antenna coil can be regulated with the relative position of transmitting aerial coil three.
Effectively the sealing in the number of turn and can regulate of described Nulling antenna coil.
As a preferred embodiment, described Nulling antenna coil, receiving antenna coil and transmitting aerial coil three are centrally located on the axis being perpendicular to coil, receiving antenna coil is positioned at the middle launching aerial coil and Nulling antenna coil, launching aerial coil all identical with the number of turn with Nulling antenna coil dimension size, wire type, winding mode, receiving antenna coil is smaller in size than Nulling antenna coil.
As another preferred embodiment, described transmitting aerial coil is for determining source rectangle frame greatly, and receiving antenna coil is smaller in size than Nulling antenna coil, and Nulling antenna coil dimension is less than transmitting aerial coil.
As another preferred embodiment, described receiving antenna coil is smaller in size than Nulling antenna coil and launches aerial coil, and the line of centres of Nulling antenna coil and transmitting aerial coil forms an angle with the axis being perpendicular to coil.
Present invention also offers the method using above-mentioned Transient electromagnetic measure device to measure, comprising:
(1) being arranged above region surface to be measured by transmitting aerial coil, receiving antenna coil is arranged above transmitting aerial coil or on same plane, Nulling antenna coil is arranged above receiving antenna coil or on same plane, and three is parallel to each other；
(2) being passed through electric current in the launching circuit being in series with transmitting aerial coil and Nulling antenna coil, it is identical or contrary with the current direction of both the direction holdings coil launching aerial coil that control electric current flows into Nulling antenna coil；
(3) the relative position of Nulling antenna coil, receiving antenna coil and transmitting aerial coil three is regulated so that the magnetic flux that the primary field that transmitting aerial coil and Nulling antenna coil combination produce passes through receiving antenna coil is consistently equal to 0 or close to 0.
In this method, according to detection needs, determine and launch antenna coil size and arrangement and receiving antenna coil position；According to transmitting aerial coil magnetic moment parameter, and transmitting-receiving relative position relation, calculate and launch the vertical magnetic field that aerial coil primary field produces in receiving position, determine the position of Nulling antenna coil and the sense of current accessing Nulling antenna coil.
In this method, further by regulating the position of Nulling antenna coil simultaneously and the number of turn can effectively be sealed in so that the magnetic flux that the primary field that transmitting aerial coil and Nulling antenna coil combination produce passes through receiving antenna coil is consistently equal to 0 or close to 0.
Aerial coil of launching in the present invention is subject to send circuit controls with the curent change synchronization of Nulling antenna coil, and keep the current direction of the two coil identical or contrary by control electric current inflow antenna direction, making in receiving antenna coil position, the magnetic field that the magnetic field that Nulling antenna coil produces produces with transmitting aerial coil is reverse in vertical direction.In actual application, launch aerial coil to determine with exploration demand with receiving antenna coil position, then the number of turn is effectively sealed in by adjust Nulling antenna coil position and/or Nulling antenna coil, the primary field magnetic flux that receiving antenna coil is obtained is consistently equal to or tends to the primary field magnetic flux in 0(region to be measured much larger than 0), eliminate or reduce the impact on receiving antenna coil for the primary field, thus eliminate or reduce the sensing transient process that receiving antenna coil produces when emission current turns off, substantially increase the secondary field Signal-to-Noise of the underground medium that receiving antenna coil senses, achieve high accuracy transient electromagnetic sounding.
Brief description
Fig. 1 is embodiment 1 little wire frame launching centre wire-retracting device schematic diagram.
Fig. 2 is receipt signal comparison diagram before and after embodiment 1 actual measurement zeroing.
Fig. 3 is that embodiment 2 determines greatly source observation device schematic diagram.
Fig. 4 is embodiment 3 dipole device schematic diagram.
In figure: the 1st, launch aerial coil；2nd, receiving antenna coil；3rd, Nulling antenna coil；4th, current direction；5th, magnetic direction (identifying the half vertical plane magnetic line of force schematic diagram that the magnetic line of force is current coil in figure).
Detailed description of the invention
The present invention is described in detail with embodiment below in conjunction with the accompanying drawings.
Embodiment 1: as it is shown in figure 1, be little frame emitter schematic diagram, including launch aerial coil 1, receiving antenna coil 2, Nulling antenna coil 3, three place plane is parallel to each other, and three is centrally located on the same central axis being perpendicular to described plane.On vertical, launch aerial coil 1 and launching on aerial coil 1 near search coverage, Nulling antenna coil 3.The vertical range of triantennary is adjustable, but ensures that receiving antenna coil 2 is positioned at transmitting aerial coil 1 and Nulling antenna coil 3 middle.Launch aerial coil 1 all identical with Nulling antenna coil 3 size, wire type, winding mode, the number of turn, and be connected in launching circuit, make to flow to 4 by two coil currents contrary.
When emitter accesses electric current in transmitting aerial coil 1 and Nulling antenna coil 3, Nulling antenna coil 3 all produces primary field with launching aerial coil 1, due to contrary by two the direction of the winding current, in receiving antenna coil 2 position, launch the vertical magnetic direction that in aerial coil 1 and Nulling antenna coil 3, electric current produces contrary；Owing to they are to be connected in launching circuit, so curent change synchronization is controlled by emitter；Due to they except electric current access in opposite direction in addition to other parameters all as, so being always in 0(Fig. 1 at the primary field magnetic flux of the receiving antenna coil 2 of their middle, to schematically show the magnetic line of force of receiving antenna coil place plane be horizontal direction, the magnetic line of force is not had to pass through receiving antenna coil), the i.e. change of primary field will not produce induction field in receiving antenna coil 2, eliminates traditional unicoil and launches the sensing transient process causing receiving antenna coil when turning off.The comparison diagram of Fig. 2 actual measurement receipt signal that is this model equipment before and after zeroing, it will be apparent that before about 150 μ s, the signal before zeroing is owing to comprising to receive the sensing transient process of coil self and distortion is bigger than normal；After zeroing, the signal that receiving antenna coil obtains is entirely the secondary turbulence field being sensed by underground medium, thus is greatly improved the secondary field signal quality of underground medium, it is achieved depth measurement in high precision.
Embodiment 2: as shown in Figure 3, for big frame emitter schematic diagram, including aerial coil the 1st, receiving antenna coil the 2nd, Nulling antenna coil 3 launched by big frame, receiving antenna coil 2 is smaller in size than Nulling antenna coil 3, Nulling antenna coil 3 is smaller in size than transmitting aerial coil 1, three place plane is parallel to each other, and relative position in a parallel direction is adjustable.The vertical range of vertical upper triantennary is adjustable (can be at grade).Launch aerial coil 1 and Nulling antenna coil 3 is connected in launching circuit, make to flow to 4 by two coil currents contrary.The effective turn of Nulling antenna coil 3 is adjustable.
When emitter is passed through electric current to launching circuit, Nulling antenna coil 3 and big frame are launched aerial coil 1 and are all produced primary field.By regulation Nulling antenna coil 3, the relative position (receiving antenna coil 2 can fall and launch the middle certain area of aerial coil 1 or at the outside certain area of frame at big frame) of aerial coil 1 three launched by receiving antenna coil 2 and big frame, adjust Nulling antenna coil 3 effectively seals in the number of turn or the horizontally or vertically distance with receiving antenna coil 2, make in receiving antenna coil 2 position, the vertical magnetic direction that Nulling antenna coil 3 launches aerial coil 1 with big frame is contrary, the primary field magnetic flux of receiving antenna coil 2 remains 0 or keeps tending to 0, thus eliminate or weaken the sensing transient process that receiving antenna coil produces when emission current turns off.
Embodiment 3: as shown in Figure 4, for dipole device schematic diagram, including launch aerial coil the 1st, receiving antenna coil the 2nd, Nulling antenna coil 3, receiving antenna coil 2 is smaller in size than Nulling antenna coil 3 and launches aerial coil 1, three place plane is parallel to each other, and relative position in a parallel direction is adjustable.On vertical, launching aerial coil 1 and launching above aerial coil 1 near search coverage, receiving antenna coil 2, Nulling antenna coil 3 is above receiving antenna coil 2, and the horizontal and vertical of triantennary is apart from adjustable.Nulling antenna coil 3 is connected in launching circuit with launching aerial coil 1, makes by the current direction 4 of two coils identical.The effective turn of Nulling antenna coil 3 is adjustable.
When emitter is passed through electric current to launching circuit, Nulling antenna coil 3 all produces primary field with launching aerial coil 1.By regulation Nulling antenna coil the 3rd, receiving antenna coil 2 with launch aerial coil 1 three relative position, adjust Nulling antenna coil 3 effectively seal in the number of turn or the vertical range with receiving antenna coil 2, make in receiving antenna coil 2 position, Nulling antenna coil 3 is contrary with the vertical magnetic direction launching aerial coil 1, the primary field magnetic flux of receiving antenna coil remains 0 or keeps tending to 0, thus eliminates or weaken the sensing transient process that receiving antenna coil produces when emission current turns off.
In being embodied as, the invention mainly includes steps:
(1) according to detection needs, determine and launch antenna coil size, launch aerial coil and arrange and receiving antenna coil position；
(2) according to transmitting aerial coil magnetic moment parameter, and transmitting-receiving relative position relation, calculate and launch the vertical magnetic field that aerial coil primary field produces in receiving position, and the position of Nulling antenna coil and the sense of current of access Nulling antenna coil is probably determined according to the direction in this vertical magnetic field, make to launch aerial coil to be 0 with the once vertical magnetic field that Nulling antenna coil produces in receiving antenna coil position or tend to 0, ensure that in the once vertical magnetic field of receiving point lower sensing zone be not 0 simultaneously；
(3) utilize receiving antenna coil observation once vertical magnetic field, finely tune Nulling antenna coil position or effectively seal in the number of turn, until once vertical magnetic field is 0 or tends to 0.
Above are only the specific embodiment of the present invention, it will be apparent to those skilled in the art that the present invention has multiple modification.All within the inventive concept of the present invention, make any modification, or equivalent etc., all should be within protection scope of the present invention.
Claims (2)
1. a Transient electromagnetic measure device, it is characterised in that:
This device includes Nulling antenna coil, receiving antenna coil and transmitting aerial coil, and three is from top to bottom
Being arranged in order and being parallel to each other, three is centrally located on the axis being perpendicular to coil, receiving antenna coil
It is positioned at the middle launching aerial coil and Nulling antenna coil；
Launch aerial coil and Nulling antenna coil dimension size, wire type, winding mode and the number of turn are homogeneous
With receiving antenna coil is smaller in size than Nulling antenna coil；
Launch aerial coil and Nulling antenna coil is serially connected so that launch aerial coil and Nulling antenna line
The magnetic flux that the primary field that circle combination produces passes through receiving antenna coil is consistently equal to 0.
2. the method that the Transient electromagnetic measure device that a kind uses described in claim 1 measures, comprising:
(1) it is arranged at transmitting aerial coil above region surface to be measured, receiving antenna coil and tune are set by described
Zero aerial coil；
(2) it in the launching circuit being in series with transmitting aerial coil and Nulling antenna coil, is passed through electric current, control electric current
Flow into Nulling antenna coil and launch the in opposite direction of aerial coil so that launching aerial coil and Nulling antenna
The magnetic flux that the primary field that coil combination produces passes through receiving antenna coil is consistently equal to 0.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410092714.XA CN103837899B (en) | 2014-03-14 | 2014-03-14 | A kind of Transient electromagnetic measure device and method |
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| CN201410092714.XA CN103837899B (en) | 2014-03-14 | 2014-03-14 | A kind of Transient electromagnetic measure device and method |
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| CN103837899A CN103837899A (en) | 2014-06-04 |
| CN103837899B true CN103837899B (en) | 2016-10-05 |
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| CN105676301B (en) * | 2016-03-18 | 2018-08-21 | 湖南五维地质科技有限公司 | A kind of layered medium transient electromagnetic sounding method for qualitative analysis |
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| CN107505385A (en) * | 2017-09-25 | 2017-12-22 | 天津特米斯科技有限公司 | A kind of transient electromagnetic sensor and detection sensing device |
| CN108227013A (en) * | 2018-01-29 | 2018-06-29 | 中国科学院电子学研究所 | A kind of reception device for transient electromagnetic exploration |
| CN108089231B (en) * | 2018-02-23 | 2020-01-10 | 中南民族大学 | Three-dimensional gradient vector method transient electromagnetic instrument and application thereof |
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| CN108776356B (en) * | 2018-06-08 | 2020-09-25 | 湖南五维地质科技有限公司 | Design method of transient electromagnetic measuring device |
| CN108776359A (en) * | 2018-07-13 | 2018-11-09 | 中南大学 | The measurement bearing calibration of the small loop line transient electromagnetic system of transceiver |
| CN108957570B (en) * | 2018-08-07 | 2020-07-28 | 湖南五维地质科技有限公司 | Method for determining position of zero-flux surface in equivalent anti-flux transient electromagnetic method |
| CN109343130B (en) * | 2018-11-27 | 2020-09-25 | 中煤科工集团西安研究院有限公司 | Laterally-excited loop source ground well transient electromagnetic detection method and system |
| CN109358367B (en) * | 2018-11-30 | 2020-05-19 | 天津大学 | Transverse moving type shallow transient electromagnetic fine exploration method |
| CN109471180A (en) * | 2018-12-28 | 2019-03-15 | 国科（重庆）仪器有限公司 | A kind of transient electromagnetic apparatus and backoff algorithm |
| CN109738958B (en) * | 2019-02-21 | 2024-03-19 | 山东蓝海可燃冰勘探开发研究院有限公司 | Ocean controllable source electromagnetic detection system |
| CN110361785B (en) * | 2019-06-21 | 2021-04-20 | 中国科学院地质与地球物理研究所 | Aviation transient electromagnetic method receiving compensation device |
| CN110456419A (en) * | 2019-08-27 | 2019-11-15 | 刘卫军 | A kind of electromagnetic excitation response signal mutual-inductance apparatus and detection device and detection method |
| CN112130213A (en) * | 2020-09-28 | 2020-12-25 | 广东科诺勘测工程有限公司 | Transient electromagnetic measurement device and method and transient electromagnetic measurement airplane |
| CN114089424A (en) * | 2021-11-02 | 2022-02-25 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Portable shallow transient electromagnetic detection device |
| CN115016014A (en) * | 2022-04-20 | 2022-09-06 | 吉林大学 | Small-size multi-turn receiving coil detection device and method for ground magnetic resonance |
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| US8362780B2 (en) * | 2009-03-16 | 2013-01-29 | Schlumberger Technology Corporation | Induction coil impedance modeling using equivalent circuit parameters |
| CN102419456B (en) * | 2011-06-30 | 2013-08-14 | 中国科学院地质与地球物理研究所 | Direct time domain processing method for transient electromagnetic sounding data |
| CN102508308B (en) * | 2011-11-03 | 2013-06-05 | 山东大学 | Transient electromagnetic multipoint array-type detection method of tunnel |
| CN202735524U (en) * | 2012-07-23 | 2013-02-13 | 中国神华能源股份有限公司 | Underground water distribution detection device with transient electromagnetic method |
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