Method for improving performance of seismic exploration moving coil detector and adjunct circuit

A technology of seismic exploration and additional circuits, applied in the field of geophysical exploration, can solve the problems that low-frequency geophones cannot be popularized or applied on a large scale, and achieve the effect of low cost

Inactive Publication Date: 2015-01-21
UNIV OF SCI & TECH OF CHINA
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Therefore, this low-frequency detector canno

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  • Method for improving performance of seismic exploration moving coil detector and adjunct circuit
  • Method for improving performance of seismic exploration moving coil detector and adjunct circuit

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[0021] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0022] The position of the performance improvement circuit of the detector of the present invention in the system is as figure 1 Shown. Connect the two output signal lines of the ordinary detector to the input terminals Gi+ and Gi- of the performance improvement circuit, and the output terminal of the performance improvement circuit is used as the signal output terminals Go+ and Go- of the improved detector. Go+ and Go- are connected to the signal input terminal of the seismic data acquisition system.

[0023] The performance improvement circuit of the detector of the present invention is as figure 2 Shown. This is a negative resistance realized with an operational amplifier and a feedback resistor. Through this circuit, the electromagnetic feedback of the ordinary detector can be enhanced, so as to improve the low frequency response bandwidth of the detecto...

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Abstract

The invention provides a method for improving the performance of a seismic exploration moving coil detector and an adjunct circuit. An electromagnetic feedback circuit is additionally arranged outside the signal output end of the detector, and the circuit can be integrated at the front end of a data collecting circuit of a seismic exploration instrument. According to a traditional low-frequency detector, the electromagnetic feedback force of the detector is enhanced by increasing the size of a permanent magnet and a coil. A circuit for enhancing electromagnetic force feedback is additionally arranged at the output end of the moving coil detector, the parameter of the feedback circuit is designed according to the dynamic characteristic of electromagnetic force of the detector, the electromagnetic force of the coil is enhanced through an electronics method, electromagnetic induction is increased, and therefore the low-frequency characteristic of the detector and the bandwidth of frequency responses are improved. Through the low-cost electronics method easy to implement, the characteristic of the low-frequency responses of a common detector is improved. The detecting result indicates that after the detector with the natural frequency of 10 Hz is improved, the defector with the natural frequency equivalent to 3 Hz to 5 Hz can be achieved conveniently.

Description

technical field [0001] The invention relates to the technical fields of geophysical prospecting, seismic prospecting and microseismic monitoring, in particular to a method and an additional circuit for realizing performance improvement of a moving coil detector for seismic prospecting. Background technique [0002] Seismic exploration is the most important method of geophysical resource exploration. Usually artificial excitation of seismic waves is used, and the reflected waves are detected by geophones, and then digitized, so as to obtain the section map of the geological structure. At present, the sensors used in land seismic exploration are mainly moving coil electromagnetic induction sensors, and it is estimated that there are tens of millions of them in use in China. Generally, a set of large-scale petroleum seismic exploration equipment usually requires thousands or even tens of thousands of geophones. [0003] The structure of the moving coil detector is mainly comp...

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Application Information

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IPC IPC(8): G01V1/18
Inventor 宋克柱董磊童声群张嗣锋
Owner UNIV OF SCI & TECH OF CHINA
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