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Borehole strain observation full-frequency band data acquisition device

A data collector and full-band technology, applied in the direction of seismic signal transmission, etc., can solve problems such as inconvenient instrument and data management, unsuitable number of channels, and lack of high-frequency microseismic or geoacoustic observation functions, so as to enrich understanding and overcome Effect of drift, effect of good application significance

Active Publication Date: 2016-10-05
INST OF EARTHQUAKE CHINA EARTHQUAKE ADMINISTRATION
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Problems solved by technology

When applied to the 4-component borehole strain seismograph proposed and realized in the national invention patent ZL20061007216.7, there are the following problems: 1. Since it is mainly designed for the three-component seismograph, the number of channels is not suitable for the borehole strain seismograph , that is, if the four components of the borehole strain seismograph are arranged in two sets of data acquisition channels as two seismographs, it will bring great inconvenience to the instrument and data management; 2. At most, only seismic waves and fixed Tide observation, does not have the observation function of high-frequency microseisms or geoacoustics
Other types of data collectors do not have the ability or function to simultaneously observe solid tides, seismic waves, high-frequency microseisms or ground sounds

Method used

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  • Borehole strain observation full-frequency band data acquisition device

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0031]A full-band data collector for borehole strain observation provided by the present invention has a structural block diagram as shown in Figure 1: the 4 component signals of the 4-component borehole strain seismograph are input into the data collector and are divided into two paths, one of which is input The low-pass filter circuit (1) is input to ADS1281 (2), and the cut-off frequency of the low-pass filter circuit (1) is set to 40Hz. ADS1281 (2) is a 32-bit high-precision large dynamic range Σ-Δ AD converter, which contains a 4-order Σ-Δ modulator, SINC and a series of FIR digital decimation filters, and can produce sampling rates from 250Hz to Convert data at 4000Hz. Because its minimum sampling rate of 250Hz usually does not meet the requirements of 100Hz sampling rate for seismic wave observation, and part of its internal FIR digital decimati...

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Abstract

The invention belongs to the digital seismic observation field and relates to a borehole strain observation full-frequency band data acquisition device. The data acquisition device is provided with two 4-input data acquisition channels, can simultaneously generate second-sampling and 100-sampling high-precision and wide-dynamic range observation data and 10000Hz-sampling high-sampling rate observation data, and carry out precise synchronization on the observation data through a GPS clock; and the borehole strain observation full-frequency band data acquisition device and a 4-component borehole strain seismograph can be combined together to form an observation system of which the frequency band ranges from 10<-6>Hz to 1000Hz, which can carry out digital observation of earth tide, seismic wave and high-frequency microquake or earth sound. According to the borehole strain observation full-frequency band data acquisition device, the traditional earth tide observation function of a borehole strain instrument is reserved; a seismic wave observation new means which cannot be realized by a pendulum seismograph can be provided; especially a high-frequency microquake observation function or an earth sound observation function is realized; and the cognition of people for seismic waves can be enriched. The borehole strain observation full-frequency band data acquisition device covers all frequency bands in the seismic observation field and has great application significance in deepening the understanding of people for high-frequency microquake or earth sound and the like.

Description

technical field [0001] The invention relates to the field of digital seismic observation, in particular to a full-band data acquisition controller for borehole strain observation. It can simultaneously produce 4 input signals with high precision and large dynamic range of sampling per second and 100Hz sampling and high sampling rate observation data of 10000Hz sampling, and the observation data can be precisely synchronized through the GPS clock, which can be used with the frequency band range of 10-6Hz-1000Hz The 4-component borehole strain seismometer together constitutes an observation system for simultaneous observation of solid tides, seismic waves and high-frequency microseisms or geoacoustics. Background technique [0002] The borehole strain gauge is a kind of crustal strain observation instrument. It is one of the main instruments in the China Digital Seismic Network, and it is also the instrument adopted by the US "Earth Lens" project. In the China Digital Seismic...

Claims

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Application Information

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IPC IPC(8): G01V1/22
Inventor 廖成旺邓涛丁炜王浩
Owner INST OF EARTHQUAKE CHINA EARTHQUAKE ADMINISTRATION
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