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Multichannel seismic signal acquisition device with high synchronization accuracy

A technology of synchronous precision and seismic signals, which is applied in the field of geophysical exploration, can solve the problems that seismic analog signals are easily affected by interference, and achieve the effects of overcoming the interference easily introduced, improving the common mode rejection ratio, and overcoming the ground potential difference

Active Publication Date: 2012-06-20
TIANJIN UNIV
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Problems solved by technology

[0005] In order to overcome the deficiencies of the existing technology, do (1) overcome the shortcomings in the prior art that weak earthquake analog signals are easily affected by interference after passing through long-distance transmission lines, and provide an acquisition board that can effectively suppress interference

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  • Multichannel seismic signal acquisition device with high synchronization accuracy
  • Multichannel seismic signal acquisition device with high synchronization accuracy
  • Multichannel seismic signal acquisition device with high synchronization accuracy

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Embodiment Construction

[0036] In order to overcome the aforesaid deficiencies of the prior art, the main technical problems to be solved by the present invention are: (1) to overcome the shortcoming that the weak earthquake analog signal in the prior art is easily affected by interference after passing through the long-distance transmission line, and to provide a method that can effectively suppress the interference collection board. (2) To overcome the disadvantages of less seismic signal acquisition channels, low integration, and large volume in the prior art, a highly integrated acquisition board capable of synchronously acquiring 16 channels of seismic signals with high precision is provided. (3) To break through the current situation that existing seismic instruments only have microsecond-level precision in synchronous acquisition of seismic signals, and provide a 16-channel seismic signal acquisition board with nanosecond-level high synchronization precision.

[0037] The present invention is ...

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Abstract

The invention belongs to the field of geophysical exploration and provides a method. Real-time acquisition of multiview stereo images can be realized by using fewer cameras. The invention provides a nanosecond acquisition board which can effectively suppress interference and has high integration level. The invention provides a multichannel seismic signal acquisition device with high synchronization accuracy. The device comprises a preamplifier and an analog-digital converter, wherein the signal detected by each sensor is transmitted to a channel of each analog-digital conversion chip after passing through the preamplifier, a multicircuit switch, a gain control circuit and a signal conditioning circuit respectively; and the data output by the analog-digital conversion chips are transmittedto a data receiving and retransmitting device by a data preprocessor. The device also comprises a gain control module, a self-check control module, a command decoder, a synchronous clock receiver andthe data receiving and retransmitting device. The device is mainly applied to geophysical exploration.

Description

technical field [0001] The invention belongs to the field of geophysical exploration, in particular to a multi-channel seismic signal acquisition device with high synchronization precision for geophysical exploration. Background technique [0002] The seismic signal acquisition system is a very critical equipment in seismic exploration. The sensors in the seismic acquisition system are arranged in a chain and are highly dispersed. Moreover, the seismic signal is weak, and the distance from the sensor to the analog-to-digital converter is large. Therefore, it is a key to effectively obtain seismic signals to transmit weak seismic signals to analog-to-digital converters without distortion over long distances. In addition, due to the large attenuation characteristics of different geological layers to the acoustic signal reflection, the seismic acquisition system must have the ability to have a large dynamic range, low noise, low drift, and strong interference suppression capabi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/22
Inventor 段发阶蒋佳佳陈劲何智刚常宗杰张超华香凝
Owner TIANJIN UNIV
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