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Noise suppression method for superconducting transient electromagnetic application

A noise suppression, transient electromagnetic technology, applied in the direction of electric/magnetic exploration, utilization of re-radiation, sound wave re-radiation, etc., can solve the problem of unsatisfactory noise suppression effect.

Active Publication Date: 2014-07-30
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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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 reference, Geophysics 44, 53‐68 (1979)) reported by Gamble T.D. et al. etc., but due to the non-stationarity of the noise signal, these processing methods are not ideal for suppressing noise

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  • Noise suppression method for superconducting transient electromagnetic application
  • Noise suppression method for superconducting transient electromagnetic application
  • Noise suppression method for superconducting transient electromagnetic application

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Embodiment Construction

[0032] According to the method mentioned above, the superconducting TEM receiving system is improved to suppress the 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] Manufacture two sets of superconducting TEM receiving systems, such as Figure 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) Field TEM system and environmental magnetic field reference system setup

[0036] When carrying out TEM experiments in the field, after laying out the TEM transmitting coil, two sets of s...

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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 applications, belonging to the technical field of transient electromagnetic applications in geophysics. Background technique [0002] With the development of industry and technology, human beings have more and more urgent demands for mineral resources, and the mineral resources buried in shallow strata are basically exhausted, so mineral exploration work is gradually moving to hidden mines and blind mines that are deeper underground. As a result, higher requirements are put forward for the performance of various instruments and equipment for geophysical exploration. In the field of geophysical electrical prospecting, the Transient Electromagnetic Method (TEM) is currently the most sensitive method in detecting large depths and finding low-resistivity geological bodies in high-resistivity areas, and has great potential for development And prospects, providi...

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Application Information

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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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