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Controllable-source high-frequency magnetotelluric instrument system and measuring method

A technology of magnetotellurics and measurement methods, applied in geophysical measurement, radio wave measurement systems, instruments, etc., can solve the problems of ignoring shallow excavation on the ground surface, large detection blind area of ​​shallow targets, etc., and achieve the effect of reducing detection blind area

Pending Publication Date: 2019-03-19
国科(重庆)仪器有限公司
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Problems solved by technology

However, the highest frequency that the current controllable source audio magnetotelluric system can achieve is 9.6KHz, according to the formula relationship between frequency and skin depth h=356×((ρ / f) 0.5 ) It can be seen that the frequency range of 0-9.6KHz can measure extremely deep underground. Since a frequency corresponds to a skin depth, although the depth of the existing sounding is relatively deep, the excavation of the shallow layer of the ground is ignored. For shallow targets, the detection blind zone is large

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  • Controllable-source high-frequency magnetotelluric instrument system and measuring method

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Embodiment Construction

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0037] Such as Figure 1-2 As shown, a controllable source high-frequency magnetotelluric instrument system includes a transmitting end and a receiving end. The receiving end is set within the range of the vertical electromagnetic field measurement range of the transmitting electrode of the transmitting end and the transmitting and receiving distance is 1.5 to 3Km. The measurement range of the electromagnetic field of the vertical line of the electrode is a 60° fan-shaped range of the horizontal line centered on the vertical line of the transmitting electrode.

[0038] The transmitting end includes a high-frequency transmitter 1 and a power supply 16 , and the power supply 16 is connected to the high-frequency transmitter 1 . In this embodiment, the frequency range of the high-frequency transmitter transmission 1 is 81.92KHz~4Hz, which can be achieved by usi...

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Abstract

The invention discloses a controllable-source high-frequency magnetotelluric instrument system. The controllable-source high-frequency magnetotelluric instrument system comprises an emitting terminaland a receiving terminal, the receiving terminal is arranged in the emitting-electrode midperpendicular electromagnetic field measuring range of the emitting terminal and in a region with the receiving-emitting distance of 1.5 Km to 3 Km; the emitting-electrode midperpendicular electromagnetic field measuring range is a 60-degree sector range with the emitting-electrode midperpendicular as the central horizontal line; the invention also discloses a controllable-source high-frequency magnetotelluric instrument method. By means of the controllable-source high-frequency magnetotelluric instrumentsystem, earth's surface constructions within 500 m can be efficiently and accurately measured, and a detecting dead zone is reduced.

Description

technical field [0001] The invention relates to the technical field of geophysics, in particular to a controllable-source high-frequency magnetotelluric instrument system and a measurement method. Background technique [0002] Magnetotelluric sounding is a geophysical prospecting method that uses natural alternating electromagnetic fields to study the structure of the earth. Its field source is the natural alternating electromagnetic field generated by the interaction between the earth and the solar wind. It has the advantages of low frequency, long wavelength, and large detection depth. . Controlled source audio magnetotelluric method is an electromagnetic sounding technology developed in the 1970s. This method uses artificial long source. Compared with natural source magnetotelluric sounding method, it has the advantages of high signal-to-noise ratio, fast and efficient. It has been widely used and played an important role in the exploration of mineral resources such as en...

Claims

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Application Information

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IPC IPC(8): G01V3/08
CPCG01V3/083
Inventor 陈健马磊
Owner 国科(重庆)仪器有限公司
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