摘要
本文介绍一种新的轻便数字地震仪DAS1。其设计特点是:双微处理器硬件结构;过采样AD转换技术的运用;线性相位和最小相位FIR数字滤波的运用;大容量CMOS快闪存贮器作数据存储介质;GPS授时和内部高精度数字钟相结合的时间服务系统;采集器功耗低于065W。该仪器有3个信号输入通道,0~40Hz的带宽和16位字长。它可方便地用于人工地震测深及天然地震流动观测
The
portable digital seismic acquisition system (DAS 1),which was developed by th e Research
Center of Exploration Geophysics of China Seismological Bureau(CSB),i s presented in this
paper. This system features three channels of recording with 16 bit Σ Δ AD converto r.The
bandwidth of the system is 0~40Hz. Another characters of DAS 1 are as follows:Two
microprocessor are used;Linear o r minimum phase FIR filter can be selected;Acquired data are
stored in CMOS Flash Memory;The time service system consists of an external GPS receiver
and an inte rnal clock;Power consumption of acquisition unit is less than 0 65W.There are 3
trigger mode (timed,event and continuos) to be selected.Therefore,DAS 1 can be deployed in
portable surveys for both DSS and earthquake observations.
引文
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