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通过对传统数字式地震检波器的改造 ,使其输出信号真正数字化。新型数字式地震检波器的设计 ,部分借鉴遥测地震仪的思路 ,采用主从式CPU管理机制 ,使每个检波器内部带有基于AT87C51的高精度、高采样率、大存储量的地震信号采集系统。该系统采用Δ -ΣA/D转换器、程控增益运算放大器、非易失性数据存储和RS -4 85通信接口等先进技术获取数据 ,从而减小了有用信号的衰减 ,增强抗干扰能力 ,提高了信噪比 ,并有效克服了常规集中式地震仪在数据采集过程中的瓶颈效应。新型数字式地震检波器的设计 ,完全可以适应高分辨率地震勘探的要求 ,为基于可控震源的新型地震仪的实现起到了决定性作用。
Through the transformation of the traditional digital geophone to make its output signal truly digital. The design of the new digital geophone is based on the idea of telemetry seismograph and adopts master-slave CPU management mechanism to make each geophone with seismic signal acquisition with high precision, high sampling rate and large storage based on AT87C51 system. The system uses delta-sigma A / D converters, programmable gain operational amplifiers, nonvolatile data storage and RS -485 communication interface and other advanced technology to obtain data, thereby reducing the useful signal attenuation, anti-interference ability and improve SNR, and effectively overcome the bottleneck effect of conventional centralized seismograph in data acquisition. The design of the new digital geophone can fully meet the requirements of high-resolution seismic exploration and play a decisive role in the implementation of the new seismometer based on vibrator.