A geoelectric field sensor system and electrode embedding method thereof

Abstract

The invention discloses an earth electric field sensor system and an electrode embedding method thereof. The weak information is lost in the long-distance transmission of the existing earth electric field signals. The common electrode and the north-south azimuth electrode are connected with a pre-stage passive band-pass filter of a pre-stage signal conditioning circuit, and simultaneously connected with a pre-stage passive band-pass filter of another pre-stage signal conditioning circuit with the east-west azimuth electrode; after an earth electric field signal is transmitted to the pre-stagesignal conditioning circuit, the earth electric field signal is sequentially subjected to the filtering of the pre-stage passive band-pass filter, the amplification of a pre-stage mixed instrument amplifier, the filtering of a pre-stage active band-pass filter and the signal conditioning of a pre-stage single-ended slip differential circuit in the pre-stage signal conditioning circuit, and the differential signal is output to a corresponding post-stage signal conditioning circuit for further signal conditioning. According to the earth electric field sensor system and the electrode embedding method thereof, the front-stage circuit adopts the mixed instrument amplifier and has the advantages of high input impedance, low noise and low offset; the electrode embedding method ensures that the electrode can be in good contact with the soil medium and enhances the long-term stability of the electrode working.

Description

technical field [0001] The invention relates to the technical field of geophysical electric field exploration, in particular to a geoelectric field sensor system and an electrode embedding method thereof. Background technique [0002] At present, the geoelectric field instrument used in China is mainly the ZD9A geoelectric field instrument. After the electrode signals are collected by the center, they are directly transmitted to the recording room through the cable without any signal processing. Because the electric field signal is a weak signal, the long-distance transmission loses weak Useful information is unfavorable to the extraction of geoelectric field information. For example, the recording room is too close to the central collection point, and interference such as personnel activities in the recording room and mains power is unavoidable. Contents of the invention [0003] In view of the above-mentioned technical defects, an object of the present invention is to pr...

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Problems solved by technology

[0002] At present, the geoelectric field instrument used in China is mainly the ZD9A geoelectric field instrument. After the electrode signals are collected by the center, they are directly transmitted to the recording room through the cable without any signal processing. Because the electric field signal is a weak signal, the long-distance transmission loses weak Useful information is unfavorable to the extraction of geoelectric field information. For example, the recording room is too close to the central collection point, and interference such as personnel activities in the recording room and mains power is unavoidable.

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