CN103499839A - Low-noise transient electromagnetism measuring device with function of automatically eliminating interference of primary field - Google Patents
Low-noise transient electromagnetism measuring device with function of automatically eliminating interference of primary field Download PDFInfo
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Abstract
The invention relates to a low-noise transient electromagnetism measuring device with the function of automatically eliminating interference of a primary field. The low-noise transient electromagnetism measuring device with function of automatically eliminating interference of the primary field comprises a transmitting coil and a receiving coil, wherein a gap is reserved between the transmitting coil and the receiving coil, when the receiving coil is wound, the receiving coil is wound to form a primary measuring coil and four additional secondary coils, the primary measuring receiving coil and the transmitting coil are placed in a concentric mode, the four secondary coils are arranged on the four corners of the interior of the transmitting coil, and are connected with the main measuring receiving coil in series, and the winding direction of the primary measuring receiving coil is opposite to the winding direction of each secondary coil. The low-noise transient electromagnetism measuring device with the function of automatically eliminating interference of the primary field has the advantages that the influence of mutual inductance can be effectively reduced; due to the fact that the mutual inductance effect between the transmitting coil and the receiving coil is used for reducing the influence of the transmitting coil on the receiving coil, interference of the primary field is eliminated, and effective utilization of a secondary field signal is ensured; the low-noise transient electromagnetism measuring device has a certain interference noise restraining effect, can improve the signal-to-noise ratio to some extent, and facilitates identification and extraction of later-period weak signals of a secondary field; the form of a traditional center loop measuring device is not changed, and detection and construction are convenient and rapid.
Description
Technical field
The present invention relates to the transient electromagnetic detecting technology, specifically a kind of primary field disturbs from the low noise transient electromagnetic measurement mechanism disappeared.
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Background technology
As everyone knows, transient electromagnetic method belongs to TDEM, is called for short TEM.It is to utilize earth-free loop line to underground transmission pulsatile once magnetic field, at pulsatile once magnetic field tempus intercalare, utilize coil observation induction secondary electromagnetic field, the research by induction secondary electromagnetic field time space distribution, reach the method that solves the structure analysis of detected object electro permanent magnetic.Development along with the geophysical survey cause, the exploration of complex area is increasing, the transient electromagnetic method data acquisition more and more is subject to the restriction of perform region condition, particularly in tunnel, down-hole forward probe, due to limitation of construction, loop's area can not be too large, makes the signal collected very faint, the degree of depth of surveying reduces greatly, can not meet the requirement of meticulous exploration and forward probe.For meeting above requirement, in the situation that coil size is certain, have to increase coil turn, but thus also with the problem that affects of mutual inductance (citing document: Xiao Minghui etc. the little wire frame transient electromagnetic of domestic multiturn the Research Status .2011,10:158-159).In transient electromagnetic method, as Natural electromagnetic field noise, the humane interference and underground coal mine electrical equipment running etc., measurement effect that all can the severe jamming transient electromagnetic equipment, must find effective method in order to suppress to disturb.
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Summary of the invention
The objective of the invention is the deficiency existed in order to solve the above-mentioned background technology, propose a kind of effective minimizing mutual inductance, improve signal to noise ratio (S/N ratio) and can utilize mutual inductance to affect to weaken the transient electromagnetic measurement mechanism of primary field.
For achieving the above object, the present invention adopts following technical scheme: primary field disturbs from the low noise transient electromagnetic measurement mechanism disappeared, comprise transmitting coil and built-in receiving coil wherein, described receiving coil is mutually in series by main measuring coil and several subcoils, described subcoil is uniformly distributed between described transmitting coil and main measuring coil, the coiling direction of described main measuring coil and the coiling opposite direction of subcoil.
Described transmitting coil, main measuring coil and four subcoils are three-back-shaped structure, and are positioned at same plane; Described subcoil is arranged between the exterior angle of the interior angle of transmitting coil and main measuring coil, and wherein the central point of transmitting coil and main measuring coil overlaps.
Leave space between described transmitting coil and main measuring coil and subcoil.
beneficial effect of the present invention:the present invention adopts unique device design, and on the one hand, the transmitting coil size is greater than receiving coil, and leaves space between transmitting coil and receiving coil, can effectively reduce the mutual inductance impact; On the other hand, utilize the mutual inductance effect between transmitting coil and receiving coil to reduce the impact of transmitting coil on receiving coil, when slackening the primary field interference, ensured effective utilization of secondary field signal; The third aspect, himself possess certain interference noise suppression, can improve signal to noise ratio (S/N ratio) to a certain extent, especially more is conducive to the identification of secondary field weak signal in late period and extracts; The present invention does not change traditional center go-and-return measurement device form, surveys construction convenient.
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The accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of receiving coil;
Fig. 3 is receiving coil coiling direction rough schematic of the present invention;
Fig. 4 is the induced voltage die-away curve figure that the present invention measures;
In figure, 1. transmitting coil, 2. receiving coil, 3. main measuring coil, 4. subcoil, 5. main measuring coil coiling direction, 6. subcoil coiling direction, 7. main measure coil currents direction, 8. subcoil direction of current, 9. emission lead-in wire, 10. receive leg.
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Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
Embodiment 1: as Figure 1-3, primary field disturbs from the low noise transient electromagnetic measurement mechanism disappeared, and comprises transmitting coil 1 and receiving coil 2, and receiving coil 2 is built in transmitting coil 1, and both are connected with receiver with receive leg 10 through emission lead-in wire 9 respectively.
The size of transmitting coil 1 is greater than receiving coil 2, between transmitting coil 1 and receiving coil 2, leaves space, and both are three-back-shaped structure; Receiving coil 2, when coiling, turns to 3, four additional subcoils 4 of a main measuring coil, and subcoil 4 also is three-back-shaped structure.Main measuring coil 3 is positioned at same plane with transmitting coil 1, adopts the common midpoint form to put, between the drift angle outside of the inboard and main measuring coil of the drift angle that four additional subcoils 4 are positioned over respectively transmitting coil 1 and connect with main measuring coil; Main measuring coil coiling direction 5 is contrary with subcoil coiling direction 6.
Detection principle of the present invention is: after excitation power supply is encouraged transmitting coil, four additional little receiving coils are due to the most close transmitting coil, affected by the transmitting coil mutual inductance more intense, primary field intensity is large, therefore, for the traditional measurement device form, due to the existence of four additional little receiving coils, and the induced electromotive force signals reverse of main measuring coil and four additional small coils, can reach the purpose that weakens primary field like this.Because coiling is reverse, the response of neighbourhood noise in large and small receiving coil is also reverse, can suppress like this noise, increase signal to noise ratio (S/N ratio), is conducive to the identification of useful signal.
As shown in Figure 4, it is employing same transmitting coil (Tx), the induced voltage die-away curve that adopts respectively the same measuring point of multi-form receiving coil (Rx1, Rx2) to measure, and Tx and Rx are for being total to the center combination type of device.Wherein the Rx2 coil form is shown in accompanying drawing 1-3, and the Rx1 form is removed the outer same Rx2 of four additional small coils.
From Fig. 4, can obviously find out: (1) is although super width phenomenon all appears in the early stage field signal that curve 1,2 reflects, but still have larger difference: the early stage field signal that curve 1 reflects is stronger, super width phenomenon is even more serious, curve 1 exit saturation signal time (being about 48.8 μ s) be later than curve 2 and exit saturated channel time (being about 33.6 μ s); (2) primary field of curve 2 correspondences is to the transit time (approximately 37.6 μ s) of secondary field, shorter than the transit time of curve 1 correspondence (approximately 55.2 μ s); (3) the secondary field signal attenuation trend model that curve 1,2 reflects is basically identical, and secondary field signal in late period (the curve tail props up) is all affected by noise, and fluctuation appears in die-away curve, but curve 2 decay are more level and smooth, fluctuate less;
Wherein, (1) (2) have illustrated under the same terms and have compared Rx1, the primary field disturbing effect that Rx2 is produced by transmitting loop is less, himself transient state process is also shorter, the early stage information of secondary field in the early stage field signal of collection gained is retained largely like this, more favourable for the shallow-layer geology detecting; (3) illustrated that Rx2 can ensure the secondary field signal, especially a little less than affected by noise the wanting of field signal in late period, it is high that signal to noise ratio (S/N ratio) is wanted, and this has benefited from this structural design itself and has certain suppression for noise signal, so mid-deep strata geology detecting effect is better.
Embodiment 2: as different from Example 1 in the situation that guarantee that one-piece construction is constant, the winding method of receiving coil can be various, and the shape that receiving coil is coiled into also can be various, as long as guarantee main measuring coil and four additional small coil coiling opposite directions.
Specifically, in implementation process, a kind of primary field disturbs from the low noise transient electromagnetic measurement mechanism disappeared, and comprises the following steps:
(1) wholely adopt common midpoint measurement mechanism form, but during the receiving coil coiling, with single line, it is coiled into to a main measuring coil, four additional small coil forms, and main measuring coil and four additional small coil coiling opposite directions;
(2), according to the real work needs, determine the parameters such as the number of turn, the length of side of transmitting coil and receiving coil, and determine its fixed form etc.;
(2) transmitting coil joint access transmitter, be connected the joint of receiving coil with receiver;
(3), after excitation power supply is encouraged transmitting coil, the signal that acquisition channel obtains receiving coil carries out whole process collection, and imports the signal collected into receiver, data acquisition.
Above are only embodiments of the invention, to one skilled in the art, the present invention has multiple change and variation.Allly within invention thought of the present invention and principle, make any modification, be equal to replacement, improve etc., within all should being included in protection scope of the present invention.
Claims (3)
1. primary field disturbs from the low noise transient electromagnetic measurement mechanism disappeared, comprise transmitting coil and built-in receiving coil wherein, it is characterized in that: described receiving coil is mutually in series by main measuring coil and several subcoils, described subcoil is uniformly distributed between described transmitting coil and main measuring coil, the coiling direction of described main measuring coil and the coiling opposite direction of subcoil.
2. primary field according to claim 1 disturbs from the low noise transient electromagnetic measurement mechanism disappeared, and it is characterized in that:
Described transmitting coil, main measuring coil and four subcoils are three-back-shaped structure, and are positioned at same plane; Described subcoil is arranged between the drift angle outside of the inboard and main measuring coil of the drift angle of transmitting coil, and wherein the central point of transmitting coil and main measuring coil overlaps.
3. primary field according to claim 1 and 2 disturbs from the low noise transient electromagnetic measurement mechanism disappeared, and it is characterized in that: between described transmitting coil and main measuring coil and subcoil, leave space.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941298A (en) * | 2014-04-15 | 2014-07-23 | 太原理工大学 | Transient electromagnetic instrument and hydro-geologic prospecting method for mine |
| CN105204076A (en) * | 2015-10-19 | 2015-12-30 | 吉林大学 | Transient electromagnetic detection motion noise suppressing device and method for helicopter |
| CN107092035A (en) * | 2017-06-05 | 2017-08-25 | 山东大学 | A kind of scan-type transient electromagnetic detecting system |
| CN107356977A (en) * | 2017-07-17 | 2017-11-17 | 中国科学院地质与地球物理研究所 | A kind of device for eliminating transient electromagnetic primary field |
| 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 |
| 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 |
| CN109507739A (en) * | 2018-12-12 | 2019-03-22 | 吉林大学 | Urban underground space quick high accuracy pull-type array electromagnetic exploration apparatus and detection method |
| CN110187395A (en) * | 2019-06-24 | 2019-08-30 | 安徽理工大学 | A kind of Zero flux shallow transient electromagnetic test coil and its test method |
| CN116449438A (en) * | 2023-06-16 | 2023-07-18 | 中国地质大学（武汉） | Transient electromagnetic method reference denoising device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103941298A (en) * | 2014-04-15 | 2014-07-23 | 太原理工大学 | Transient electromagnetic instrument and hydro-geologic prospecting method for mine |
| CN105204076A (en) * | 2015-10-19 | 2015-12-30 | 吉林大学 | Transient electromagnetic detection motion noise suppressing device and method for helicopter |
| CN107092035A (en) * | 2017-06-05 | 2017-08-25 | 山东大学 | A kind of scan-type transient electromagnetic detecting system |
| CN107356977A (en) * | 2017-07-17 | 2017-11-17 | 中国科学院地质与地球物理研究所 | A kind of device for eliminating transient electromagnetic primary field |
| 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 |
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| 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 |
| CN110187395A (en) * | 2019-06-24 | 2019-08-30 | 安徽理工大学 | A kind of Zero flux shallow transient electromagnetic test coil and its test method |
| CN116449438A (en) * | 2023-06-16 | 2023-07-18 | 中国地质大学（武汉） | Transient electromagnetic method reference denoising device and method |
| CN116449438B (en) * | 2023-06-16 | 2023-09-12 | 中国地质大学（武汉） | Transient electromagnetic method reference denoising device and method |
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Denomination of invention: Primary field disturbs from the low noise transient electromagnetic measurement mechanism disappeared Effective date of registration: 20170919 Granted publication date: 20160413 Pledgee: Hefei merchants bank innovation Avenue Branch Pledgor: ANHUI HUIZHOU GEOLOGY SECURITY INSTITUTE Co.,Ltd. Registration number: 2017340000232 |
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