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A Noise Suppression Method in Superconducting Transient Electromagnetic Applications

A noise suppression and transient electromagnetic technology, which is applied in electric/magnetic exploration, utilization of re-radiation, re-radiation of sound waves, etc., can solve problems such as unsatisfactory effect of suppressing noise

Active Publication Date: 2017-04-19
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

At present, a variety of noise suppression methods have been developed, such as the environmental magnetic field reference method (Magnetotellurics with a remote magnetic reference, Geophysics 44, 53‐68 (1979)) reported by Gamble T.D. et al. Domain filtering, etc., but due to the non-stationarity of the noise signal, the effect of these processing methods on suppressing noise is not ideal

Method used

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  • A Noise Suppression Method in Superconducting Transient Electromagnetic Applications
  • A Noise Suppression Method in Superconducting Transient Electromagnetic Applications
  • A Noise Suppression Method in Superconducting Transient Electromagnetic Applications

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Embodiment Construction

[0032] According to the above method, the superconducting TEM receiving system is improved to suppress low-frequency and high-frequency noise in the system and improve the measurement accuracy of the system. The specific improvements are implemented as follows:

[0033] (1) Establishment and calibration of superconducting TEM system

[0034] Fabricate two sets of superconducting TEM receiving systems, such as Image 6 As shown in (b), each system includes components such as Dewar, SQUID sensor, readout circuit and signal processing circuit, and the performance of each system is calibrated in the laboratory to determine the magnetic field-voltage conversion coefficient of the superconducting system, Range, frequency band, noise performance and other parameters.

[0035] (2) Setting of field TEM system and ambient magnetic field reference system

[0036] When conducting TEM experiments in the field, after laying out the TEM transmitting coils, two sets of superconducting SQUI...

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Abstract

The invention relates to a noise suppression method for superconducting transient electromagnetic application. The noise suppression method is characterized in that the EMD method and the environment magnetic field reference measurement method are combined, and comprises the steps that firstly, a TEM receiving system and an environment magnetic field reference measurement system are established, a TEM signal and an environment magnetic field signal are measured respectively, and high-frequency noise filtering treatment is carried out on the TEM signal and the environment magnetic field signal through an EMD module; then, low-frequency interference related to the environment reference part is removed from the received signals; finally, a needed TEM signal is obtained. By means of the method, both high-frequency noise and low-frequency noise can be effectively suppressed; furthermore, due to real-time signal processing carried by a DSP module, the effects of improving the signal processing speed and saving the memory space of a system can be easily achieved, the application of the system is greatly promoted, and the measurement accuracy of the system is effectively improved.

Description

technical field [0001] The invention relates to a noise suppression method in superconducting transient electromagnetic application, and belongs to the technical field of transient electromagnetic application in geophysics. Background technique [0002] With the development of industry and science and technology, the demand for mineral resources is more and more urgent, and the mineral resources buried in shallow strata are basically depleted. Therefore, mineral exploration work is gradually going to deeper underground hidden and blind mines. Therefore, higher requirements are put forward for the performance of various instruments and equipment for geophysical exploration. In the field of geophysical detection and electrical exploration, the Transient Electromagnetic Method (TEM) is the most sensitive method in detecting large depths and finding low-resistance geological bodies in high-resistance areas, and has great potential for development. and prospects, providing an ef...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/10
Inventor 徐婷王会武荣亮亮常凯邱隆清伍俊侍文蒋坤谢晓明
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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