Abstract
Aiming at the problems of small dynamic range, low signal-to-noise ratio and inaccurate data acquisition of the existing cross-hole CT exploration instrument, the cross-hole CT data acquisition system is designed basing on DSP processor and lownoise high-precision A/D converter. According to signal amplitude range, it can be chosen to do signal amplification and attenuation or straight through processing, control signal to the proper sampling A/D converter, then the FIR low-pass filter is used to filter the signals, and the processed data is transmitted to the PC through the Ethernet port. The test results show that the system has large signal range, high signalto- noise ratio, and high accuracy of data acquisition, the inversion profile coincides with the borehole verification.
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