CN103837899A - Transient electromagnetic measurement device and method - Google Patents
Transient electromagnetic measurement device and method Download PDFInfo
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- CN103837899A CN103837899A CN201410092714.XA CN201410092714A CN103837899A CN 103837899 A CN103837899 A CN 103837899A CN 201410092714 A CN201410092714 A CN 201410092714A CN 103837899 A CN103837899 A CN 103837899A
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Abstract
The invention relates to a transient electromagnetic measurement device which comprises a transmitting antenna coil, a receiving antenna coil and a zero setting antenna coil which are parallel to each other. The transmitting antenna coil and the zero setting antenna coil are connected in series. Magnetic flux penetrating through the receiving antenna coil of a primary field generated by the transmitting antenna coil and the zero setting antenna coil is equal to zero or close to zero all the time, the primary field strength of a detection region below a receiving point is ensured, accordingly, the transient process of induction generated by a receiving antenna when emission current is off is eliminated or weakened, the signal to noise ratio of a secondary field signal of an underground medium sensed by the receiving antenna is increased greatly, and high-precision transient electromagnetic detection is achieved.
Description
Technical field
The invention belongs to geophysical survey field, be specifically related to a kind of transient electromagnetic measurement mechanism and method.
Background technology
Transient electromagnetic method is a kind of important method in geophysical survey field, according to the difference of the system carrier using, can be divided into 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.The method passes into electric current in transmitting wire, to target area transmitting primary field, then moment is turn-offed transmitter current, the secondary vortices flow field inducing with antenna or ground-electrode observed object Region Medium in shutoff gap, and distribute according to the electrical parameter of this secondary field information acquisition target area medium.
Current transient electromagnetic fado adopts an emitting antenna, and one or more receiving antennas adopt the devices such as great Ding Yuan, center loop line, overlapping loop line, dipole.Due to the coupling effect of emitting antenna and receiving antenna, have no progeny in pass, the induction field of receiving antenna itself will continue long transient process, the secondary field signal of the induction field of receiving antenna itself and underground induction is during this time superimposed, cause the secondary field signal distortion of underground induction, signal to noise ratio (S/N ratio) is low.The at present processing thinking to this problem: the one, on hardware, regulate inductance, electric capacity, the build-out resistor of receiving antenna, make sensor in Critical damping state, to reduce the induction field of receiving antenna itself; The 2nd, in data processing, the induced voltage of actual measurement is converted to behind magnetic field, then deducts the primary field that transmitter current variation produces, or ask for the rate of change of electric current blocking interval primary field, 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 receiving antenna self, but complex disposal process; Data processing method theory is feasible, and actual being difficult to operates.
Summary of the invention
The object of this invention is to provide a kind of transient electromagnetic measurement mechanism and the method that can effectively eliminate or greatly weaken the transient process of the induction field of receiving antenna own.
Transient electromagnetic measurement mechanism provided by the invention, comprises emitting antenna coil, receiving antenna coil and Nulling antenna coil, and three is parallel to each other; Emitting antenna coil and Nulling antenna coil are connected mutually; Make primary field that emitting antenna coil and Nulling antenna coil combination produce equal all the time 0 or close to 0 through the magnetic flux of receiving antenna coil.
Described Nulling antenna coil, receiving antenna coil and emitting antenna coil three's relative position can regulate.
Effectively the sealing in the number of turn and can regulate of described Nulling antenna coil.
As a preferred implementation, described Nulling antenna coil, receiving antenna coil and emitting antenna coil three are centered close on the axis perpendicular to coil, receiving antenna coil is positioned at the middle of emitting antenna coil and Nulling antenna coil, emitting antenna coil is all identical with Nulling antenna coil dimension size, wire type, winding mode and the number of turn, and receiving antenna coil size is less than Nulling antenna coil.
As another preferred implementation, described emitting antenna coil is to determine source rectangle frame greatly, and receiving antenna coil size is less than Nulling antenna coil, and Nulling antenna coil dimension is less than emitting antenna coil.
As another preferred implementation, described receiving antenna coil size is less than Nulling antenna coil and emitting antenna coil, the line of centres of Nulling antenna coil and emitting antenna coil with form an angle perpendicular to the axis of coil.
The present invention also provides the method that adopts above-mentioned transient electromagnetic measurement mechanism to measure, and comprising:
(1) emitting antenna coil is arranged to region surface to be measured top, receiving antenna coil is arranged on emitting antenna coil top or same plane, and Nulling antenna coil is arranged on receiving antenna coil top or same plane, and three is parallel to each other;
(2) pass into electric current to being in series with in the launching circuit of emitting antenna coil and Nulling antenna coil, control electric current and flow into Nulling antenna coil and keep the current direction of the two coil identical or contrary with the direction of emitting antenna coil;
(3) regulate Nulling antenna coil, receiving antenna coil and emitting antenna coil three's relative position, make primary field that emitting antenna coil and Nulling antenna coil combination produce equal all the time 0 or close to 0 through the magnetic flux of receiving antenna coil.
In the method, according to surveying needs, determine emitting antenna coil size and layout and receiving antenna coil position; According to emitting antenna coil magnetic moment parameter, and transmitting-receiving relative position relation, calculate the vertical magnetic field that emitting antenna coil primary field produces at receiving position, determine the position of Nulling antenna coil and the direction of current of access Nulling antenna coil.
In the method, further can be by regulate the position of Nulling antenna coil and effectively seal in the number of turn simultaneously, make primary field that emitting antenna coil and Nulling antenna coil combination produce equal all the time 0 or close to 0 through the magnetic flux of receiving antenna coil.
Emitting antenna in the present invention is synchronizeed and is sent circuit controls with the curent change of Nulling antenna, and keep the current direction of the two coil identical or contrary by controlling electric current inflow antenna direction, make in receiving antenna position, the magnetic field that the magnetic field that Nulling antenna produces and emitting antenna produce is reverse in vertical direction.In practical application, emitting antenna and receiving antenna position are determined with exploration demand, then effectively seal in the number of turn by what adjust Nulling antenna position and/or Nulling antenna, the primary field magnetic flux that receiving antenna is obtained equal all the time or the primary field magnetic flux that is tending towards 0(region to be measured much larger than 0), eliminate or weakened the impact of primary field on receiving antenna, thereby eliminate or weakened the induction transient process that receiving antenna produces in the time that transmitter current turn-offs, greatly improve the secondary field Signal-to-Noise of the underground medium that receiving antenna senses, realize high precision transient electromagnetic sounding.
Brief description of the drawings
Fig. 1 is the little wire frame launching centre of embodiment 1 wire-retracting device schematic diagram.
Fig. 2 receives signal contrast figure 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: 1, emitting antenna coil; 2, receiving antenna coil; 3, Nulling antenna; 4, current direction; 5, magnetic direction (identifying the magnetic line of force in figure is half vertical plane magnetic line of force schematic diagram of current coil).
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in detail.
Embodiment 1: as shown in Figure 1, for little frame emitter schematic diagram, comprise emitting antenna coil 1, receiving antenna coil 2, Nulling antenna coil 3, three place plane is parallel to each other, and being centered close on the same central axis perpendicular to described plane of three.Vertical upper, emitting antenna 1 the most close search coverage, Nulling antenna 3 is on emitting antenna 1.The vertical range of triantennary is adjustable, but ensures that receiving antenna 2 is positioned at emitting antenna 1 and Nulling antenna 3 middles.Emitting antenna 1 and Nulling antenna 3 sizes, wire type, winding mode, the number of turn are all identical, and are connected in launching circuit, make to flow to by two coil currents 4 contrary.
When transmitter is when accessing electric current in emitting antenna 1 and Nulling antenna 3, Nulling antenna 3 all produces primary field with emitting antenna 1, due to contrary by two the direction of the winding current, in receiving antenna 2 positions, the vertical magnetic direction that in emitting antenna 1 and Nulling antenna 3, electric current produces is contrary; Because they are to be connected in launching circuit, so curent change is synchronously subject to the control of transmitter; Because their other parameters except electric current access opposite direction are all the same, so signal shows that the magnetic line of force of receiving antenna place plane is horizontal direction in their the primary field magnetic flux of receiving antenna 2 of middle is always 0(Fig. 1, do not have the magnetic line of force to pass receiving antenna), the variation that is primary field can not produce induction field in receiving antenna 2, has eliminated the induction transient process that causes receiving antenna when traditional unicoil transmitting is turn-offed.Fig. 2 is the comparison diagram that the actual measurement before and after zeroing of this model equipment receives signal, and significantly, before approximately 150 μ s, distortion is bigger than normal due to the induction transient process that comprises receiving coil self for the signal before zeroing; After zeroing, the signal that receiving antenna obtains is the secondary vortices flow field of being responded to by underground medium completely, thereby greatly improves the secondary field signal quality of underground medium, realizes high precision depth measurement.
Embodiment 2: as shown in Figure 3, for large frame emitter schematic diagram, comprise large frame emitting antenna coil 1, receiving antenna coil 2, Nulling antenna coil 3, receiving antenna 2 sizes are less than Nulling antenna 3, Nulling antenna 3 sizes are less than emitting antenna 1, three place plane is parallel to each other, and the relative position in parallel direction is adjustable.The vertical range of vertical upper triantennary is adjustable (can at grade).Emitting antenna 1 and Nulling antenna 3 are connected in launching circuit, make to flow to by two coil currents 4 contrary.The effective turn of Nulling antenna 3 is adjustable.
In the time that transmitter passes into electric current to launching circuit, Nulling antenna 3 all produces primary field with large frame emitting antenna 1.By regulating Nulling antenna 3, receiving antenna 2 and large frame emitting antenna 1 three's relative position (receiving antenna 2 can drop on the middle certain area of large frame emitting antenna 1 or the outside certain area at frame), that adjusts Nulling antenna 3 effectively seals in the number of turn or level or vertical range with receiving antenna 2, make in receiving antenna 2 positions, Nulling antenna 3 is contrary with the vertical magnetic direction of large frame emitting antenna 1, the primary field magnetic flux of receiving antenna 2 remain 0 or keep be tending towards 0, thereby eliminate or weaken the induction transient process that receiving antenna produces in the time that transmitter current turn-offs.
Embodiment 3: as shown in Figure 4, for dipole device schematic diagram, comprise emitting antenna coil 1, receiving antenna coil 2, Nulling antenna coil 3, receiving antenna 2 sizes are less than Nulling antenna 3 and emitting antenna 1, three place plane is parallel to each other, and the relative position in parallel direction is adjustable.Vertical upper, emitting antenna 1 the most close search coverage, receiving antenna 2 is above emitting antenna 1, and Nulling antenna 3 is above receiving antenna 2, and the horizontal and vertical of triantennary is apart from capable of regulating.Nulling antenna 3 is connected in launching circuit with emitting antenna 1, makes by the current direction 4 of two coils identical.The effective turn of Nulling antenna 3 is adjustable.
In the time that transmitter passes into electric current to launching circuit, Nulling antenna coil 3 all produces primary field with emitting antenna 1.By regulate Nulling antenna 3, receiving antenna 2 and emitting antenna 1 three relative position, adjust Nulling antenna 3 effectively seal in the number of turn or the vertical range with receiving antenna 2, make in receiving antenna 2 positions, Nulling antenna 3 is contrary with the vertical magnetic direction of emitting antenna 1, the primary field magnetic flux of receiving antenna remains 0 or keep being tending towards 0, thereby eliminates or weaken the induction transient process that receiving antenna produces in the time that transmitter current turn-offs.
In concrete enforcement, the present invention mainly comprises the following steps:
(1) according to surveying needs, determine emitting antenna size, emitting antenna is arranged and receiving antenna position;
(2) according to emitting antenna magnetic moment parameter, and transmitting-receiving relative position relation, calculate the vertical magnetic field that emitting antenna primary field produces at receiving position, and probably determine the position of Nulling antenna and the direction of current of access Nulling antenna according to the direction in this vertical magnetic field, the once vertical magnetic field that emitting antenna and Nulling antenna are produced in receiving antenna position is 0 or is tending towards 0, ensures that the once vertical magnetic field of search coverage is not 0 below acceptance point simultaneously;
(3) utilize once vertical magnetic field of receiving antenna observation, finely tune Nulling antenna position or effectively seal in the number of turn, until once vertical magnetic field is 0 or is tending towards 0.
Above are only specific embodiments of the invention, to one skilled in the art, the present invention has multiple modification.All within inventive concept of the present invention, make any amendment, or be equal to replacement etc., all should be within protection scope of the present invention.
Claims (9)
1. a transient electromagnetic measurement mechanism, is characterized in that this device comprises emitting antenna coil, receiving antenna coil and Nulling antenna coil, and three is parallel to each other; Emitting antenna coil and Nulling antenna coil are connected mutually; Make primary field that emitting antenna coil and Nulling antenna coil combination produce equal all the time 0 or close to 0 through the magnetic flux of receiving antenna coil.
2. transient electromagnetic measurement mechanism according to claim 1, is characterized in that described Nulling antenna coil, receiving antenna coil and emitting antenna coil three's relative position can regulate.
3. transient electromagnetic measurement mechanism according to claim 1, is characterized in that effectively sealing in the number of turn and can regulating of described Nulling antenna coil.
4. according to the transient electromagnetic measurement mechanism one of claim 1-3 Suo Shu, it is characterized in that being centered close on the axis perpendicular to coil of described Nulling antenna coil, receiving antenna coil and emitting antenna coil three, receiving antenna coil is positioned at the middle of emitting antenna coil and Nulling antenna coil, emitting antenna coil is all identical with Nulling antenna coil dimension size, wire type, winding mode and the number of turn, and receiving antenna coil size is less than Nulling antenna coil.
5. according to the transient electromagnetic measurement mechanism one of claim 1-3 Suo Shu, it is characterized in that described emitting antenna coil is for to determine source rectangle frame greatly, receiving antenna coil size is less than Nulling antenna coil, and Nulling antenna coil dimension is less than emitting antenna coil.
6. according to the transient electromagnetic measurement mechanism one of claim 1-3 Suo Shu, it is characterized in that described receiving antenna coil size is less than Nulling antenna coil and emitting antenna coil, the line of centres of Nulling antenna coil and emitting antenna coil with form an angle perpendicular to the axis of coil.
7. a method that adopts the described transient electromagnetic measurement mechanism of one of claim 1-6 to measure, comprising:
(1) emitting antenna coil is arranged to region surface to be measured top, receiving antenna coil is arranged on emitting antenna coil top or same plane, and Nulling antenna coil is arranged on receiving antenna coil top or same plane, and three is parallel to each other;
(2) pass into electric current to being in series with in the launching circuit of emitting antenna coil and Nulling antenna coil, control the direction that electric current flows into Nulling antenna coil and emitting antenna coil, and regulate Nulling antenna coil, receiving antenna coil and emitting antenna coil three's relative position, make primary field that emitting antenna coil and Nulling antenna coil combination produce equal all the time 0 or close to 0 through the magnetic flux of receiving antenna coil.
8. the method that employing transient electromagnetic measurement mechanism according to claim 7 is measured, is characterized in that, according to surveying needs, determining emitting antenna coil size and layout and receiving antenna coil position; According to emitting antenna coil magnetic moment parameter, and transmitting-receiving relative position relation, calculate the vertical magnetic field that emitting antenna coil primary field produces at receiving position, determine the position of Nulling antenna coil and the direction of current of access Nulling antenna coil.
9. the method for measuring according to the employing transient electromagnetic measurement mechanism described in claim 7 or 8, it is characterized in that the position by regulating Nulling antenna coil and effectively seal in the number of turn, the magnetic flux that makes primary field that emitting antenna coil and Nulling antenna coil combination produce pass receiving antenna coil equals 0 or close to 0 all the time.
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105676301A (en) * | 2016-03-18 | 2016-06-15 | 湖南五维地质科技有限公司 | Layered medium transient electromagnetic sounding qualitative analytical method |
| CN106908845A (en) * | 2017-01-09 | 2017-06-30 | 重庆璀陆探测技术有限公司 | The primary field weak coupling reception device and method of electromagnetic prospecting |
| CN107203008A (en) * | 2017-04-20 | 2017-09-26 | 武汉地大华睿地学技术有限公司 | A kind of metallic conduit detecting system and method based on transient electromagnetic method |
| 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 |
| CN108089231A (en) * | 2018-02-23 | 2018-05-29 | 中南民族大学 | Three-dimensional gradient vector method Transient Electromagnetic Apparatus and its application |
| 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 |
| CN108535667A (en) * | 2018-03-26 | 2018-09-14 | 中国科学院电子学研究所 | Aviation field compensation multi-coil system based on double compensation coil |
| CN108776356A (en) * | 2018-06-08 | 2018-11-09 | 湖南五维地质科技有限公司 | The design method of Transient electromagnetic measure 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 |
| CN108957570A (en) * | 2018-08-07 | 2018-12-07 | 湖南五维地质科技有限公司 | Zero flux face method for determining position in equivalent anti-magnetic flux transient electromagnetic method |
| CN109343130A (en) * | 2018-11-27 | 2019-02-15 | 中煤科工集团西安研究院有限公司 | A kind of the Loop source ground well transient electromagnetic detecting method and system of broadside |
| CN109358367A (en) * | 2018-11-30 | 2019-02-19 | 天津大学 | A kind of horizontal moving shallow transient electromagnetic fine granularing scalability 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 |
| CN109738958A (en) * | 2019-02-21 | 2019-05-10 | 山东蓝海可燃冰勘探开发研究院有限公司 | A kind of ocean controllable source electromagnetic survey system |
| CN110361785A (en) * | 2019-06-21 | 2019-10-22 | 中国科学院地质与地球物理研究所 | A kind of aviation transient electromagnetic method reception 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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| CN106908845A (en) * | 2017-01-09 | 2017-06-30 | 重庆璀陆探测技术有限公司 | The primary field weak coupling reception device and method of electromagnetic prospecting |
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| CN107203008B (en) * | 2017-04-20 | 2019-02-01 | 武汉地大华睿地学技术有限公司 | A kind of metallic conduit detection system and method based on transient electromagnetic method |
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| 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 |
| CN108089231A (en) * | 2018-02-23 | 2018-05-29 | 中南民族大学 | Three-dimensional gradient vector method Transient Electromagnetic Apparatus and its application |
| CN108535667A (en) * | 2018-03-26 | 2018-09-14 | 中国科学院电子学研究所 | Aviation field compensation multi-coil system based on double compensation coil |
| CN108776356A (en) * | 2018-06-08 | 2018-11-09 | 湖南五维地质科技有限公司 | The design method of Transient electromagnetic measure 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 |
| CN108957570A (en) * | 2018-08-07 | 2018-12-07 | 湖南五维地质科技有限公司 | Zero flux face method for determining position in equivalent anti-magnetic 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 |
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| CN109358367A (en) * | 2018-11-30 | 2019-02-19 | 天津大学 | A kind of horizontal moving shallow transient electromagnetic fine granularing scalability method |
| 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 |
| CN109738958A (en) * | 2019-02-21 | 2019-05-10 | 山东蓝海可燃冰勘探开发研究院有限公司 | A kind of ocean controllable source electromagnetic survey system |
| 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 |
| CN110361785A (en) * | 2019-06-21 | 2019-10-22 | 中国科学院地质与地球物理研究所 | A kind of aviation transient electromagnetic method reception 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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