CN103499839B - Primary field interference is from the low noise Transient electromagnetic measure device disappeared - Google Patents
Primary field interference is from the low noise Transient electromagnetic measure device disappeared Download PDFInfo
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Abstract
The present invention relates to primary field interference from the low noise Transient electromagnetic measure device disappeared, comprise transmitting coil and receiving coil, leave space between the two; Receiving coil is when coiling, turn to a main measuring coil and four additional subcoils, wherein, main measurement receiving coil and transmitting coil adopt common midpoint form to put, four subcoils are positioned over four angles place in transmitting coil respectively and connect with main measurement receiving coil, and the coiling direction of main measurement receiving coil is contrary with the coiling direction of subcoil.The present invention one effectively can reduce mutual inductance impact; Two is utilize the mutual inductance effect between transmitting coil and receiving coil to reduce the former impact on the latter, while slackening primary field interference, has ensured effective utilization of secondary field signal; Three is himself possess certain interference noise suppression, can improve signal to noise ratio (S/N ratio) to a certain extent, be beneficial to secondary field weak-signals incept in late period and extraction; The present invention does not change traditional Genter loop measurement mechanism form, and detection construction is convenient.
Description
Technical field
The present invention relates to transient electromagnetic detecting technology, specifically a kind of primary field interference is from the low noise Transient electromagnetic measure device disappeared.
Background technology
As everyone knows, transient electromagnetic method belongs to TDEM, is called for short TEM.It utilizes earth-free loop line to send pulsatile once magnetic field to underground, at pulsatile once magnetic field tempus intercalare, utilize coil to observe induction secondary electromagnetic field, by the research to induction secondary electromagnetic field time space distribution, reach the method solving the structure analysis of detected object electro permanent magnetic.Along with the development of geophysical survey cause, the exploration of complex area is increasing, transient electromagnetic method data acquisition is more and more subject to the restriction of perform region condition, particularly in tunnel, down-hole forward probe, due to execution conditions restriction, loop's area can not be too large, makes the signal that collects very faint, the degree of depth of detection reduces greatly, can not meet the requirement of fine granularing scalability and forward probe.For meeting above requirement, when coil size is certain, have to increase coil turn, but the problem that affects thus also with mutual inductance (citing document: Xiao Minghui etc. domestic multiturn little wire frame transient electromagnetic the Research Status .2011,10:158-159).In transient electromagnetic method, as Natural electromagnetic field noise, humane interference and underground coal mine electrical equipment running etc., all can the measurement effect of severe jamming transient electromagnetic equipment, must effective method be found to suppress interference.
Summary of the invention
The object of the invention is the deficiency existed to solve above-mentioned background technology, proposing a kind of effective minimizing mutual inductance, improve signal to noise ratio (S/N ratio) and mutual inductance can be utilized to affect the Transient electromagnetic measure device weakening primary field.
For achieving the above object, the present invention adopts following technical scheme: primary field interference is from the low noise Transient electromagnetic measure device 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, and the coiling direction of described main measuring coil is contrary with the coiling 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 interior angle of transmitting coil and the exterior angle of main measuring coil, wherein the point coincides of transmitting coil and main measuring coil.
Space is left between described transmitting coil and main measuring coil and subcoil.
Beneficial effect of the present invention: the present invention adopts unique apparatus design, and on the one hand, transmitting coil size is greater than receiving coil, and leaves space between transmitting coil and receiving coil, effectively can reduce 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, while slackening primary field interference, ensure effective utilization of secondary field signal; The third aspect, himself possesses certain interference noise suppression, can improve signal to noise ratio (S/N ratio) to a certain extent, is especially more conducive to secondary field weak-signals incept in late period and extraction; The present invention does not change traditional Genter loop measurement mechanism form, and detection construction is convenient.
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 of the present invention rough schematic;
Fig. 4 is the induced voltage die-away curve figure that the present invention's measurement obtains;
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. launch lead-in wire, 10. receive leg.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
Embodiment 1: as Figure 1-3, primary field interference is from the low noise Transient electromagnetic measure device disappeared, and comprise transmitting coil 1 and receiving coil 2, receiving coil 2 is built in transmitting coil 1, and both are connected with receiver with receive leg 10 through launching lead-in wire 9 respectively.
The size of transmitting coil 1 is greater than receiving coil 2, leaves space between transmitting coil 1 and receiving coil 2, and both are three-back-shaped structure; Receiving coil 2, when coiling, turns to a main measuring coil 3, four additional subcoils 4, and subcoil 4 is also in three-back-shaped structure.Main measuring coil 3 and transmitting coil 1 are positioned at same plane, adopt common midpoint form to put, and connect between inside the drift angle that four additional subcoils 4 are positioned over transmitting coil 1 respectively and outside the drift angle of main measuring coil 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 encourages transmitting coil, four additional little receiving coils are due near transmitting coil, affect stronger by transmitting coil mutual inductance, primary field intensity is large, therefore, for typical measuring arrangements 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, the object weakening primary field can be reached like this.Because coiling is reverse, the response of neighbourhood noise in large and small receiving coil is also reverse, can suppress noise like this, increase signal to noise ratio (S/N ratio), be conducive to the identification of useful signal.
As shown in Figure 4, it, for adopting same transmitting coil (Tx), adopts the induced voltage die-away curve that the measurement of multi-form receiving coil (Rx1, Rx2) same observation station obtains respectively, and Tx and Rx is concentrically combination unit type.Wherein Rx2 coil form is shown in accompanying drawing 1-3, and Rx1 form removes the outer same Rx2 of four additional small coils.
As apparent from Fig. 4 can: (1) is although all there is super width phenomenon in the early stage field signal that curve 1,2 reflects, but still there is larger difference: the early stage field signal that curve 1 reflects is stronger, super width phenomenon is even more serious, namely 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 correspondence is to transit time (about 37.6 μ s) of secondary field, shorter than the transit time (about 55.2 μ s) of curve 1 correspondence; (3) the secondary field signal attenuation trend model that reflects of curve 1,2 is basically identical, and secondary field signal in late period (curve tail props up) is all affected by noise, and fluctuation appears in die-away curve, but curve 2 is decayed more level and smooth, fluctuates less;
Wherein, (1) (2) compare Rx1 under describing the same terms, the primary field disturbing effect that Rx2 produces 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 such collection gained is retained largely, for shallow-layer geology detecting advantageously; (3) describe Rx2 and can ensure secondary field signal, especially late period, field signal was affected by noise weak, signal to noise ratio (S/N ratio) wants high, and this has benefited from this structural design itself and has certain suppression for noise signal, and therefore mid-deep strata geology detecting effect is better.
Embodiment 2: as different from Example 1 when ensureing 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 ensure that main measuring coil is contrary with four additional small coil coiling directions.
Specifically in implementation process, a kind of primary field interference, from the low noise Transient electromagnetic measure device disappeared, comprises the following steps:
(1) overall employing common midpoint measurement mechanism form, but during receiving coil coiling, be coiled into a main measuring coil, four additional small coil forms with single line, and main measuring coil is contrary with four additional small coil coiling directions;
(2) according to real work needs, determine the parameters such as the number of turn of transmitting coil and receiving coil, the length of side, and determine its fixed form etc.;
(2) transmitting coil joint access transmitter, is connected the joint of receiving coil with receiver;
(3) after excitation power supply encourages transmitting coil, acquisition channel carries out whole process collection to the signal that receiving coil obtains, 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 change.Allly within invention thought of the present invention and principle, make any amendment, equivalently to replace, improve, all should be included within protection scope of the present invention.
Claims (2)
1. primary field interference is from the low noise Transient electromagnetic measure device 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, and the coiling direction of described main measuring coil is contrary with the coiling direction of subcoil; Described transmitting coil, main measuring coil and subcoil are three-back-shaped structure, and are positioned at same plane; Between inside the drift angle that described subcoil is arranged in transmitting coil and outside the drift angle of main measuring coil, the wherein point coincides of transmitting coil and main measuring coil.
2. primary field according to claim 1 interference is from the low noise Transient electromagnetic measure device disappeared, and it is characterized in that: leave space between described transmitting coil and main measuring coil and subcoil.
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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 |
| CN105204076B (en) * | 2015-10-19 | 2017-07-14 | 吉林大学 | Helicopter transient electromagnetic detecting motion artifacts restraining device and noise suppressing method |
| 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 |
| CN109507739B (en) * | 2018-12-12 | 2019-10-01 | 吉林大学 | Urban underground space quick high accuracy pull-type array electromagnetic exploration apparatus and detection method |
| CN109471180B (en) * | 2018-12-28 | 2024-07-30 | 国科（重庆）仪器有限公司 | Transient electromagnetic instrument and compensation algorithm |
| CN110187395B (en) * | 2019-06-24 | 2020-12-01 | 安徽理工大学 | A zero-flux shallow transient electromagnetic test coil and its test method |
| CN116449438B (en) * | 2023-06-16 | 2023-09-12 | 中国地质大学（武汉） | A transient electromagnetic method reference noise elimination device and method |
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| US6628119B1 (en) * | 1998-08-28 | 2003-09-30 | Den Norske Stats Oljeselskap A.S. | Method and apparatus for determining the content of subterranean reservoirs |
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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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Date of cancellation: 20221026 Granted publication date: 20160413 Pledgee: Hefei merchants bank innovation Avenue Branch Pledgor: ANHUI HUIZHOU GEOLOGY SECURITY INSTITUTE Co.,Ltd. Registration number: 2017340000232 |