摘要
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。
The new geophone truly realizes digital output signal by improving the conventional one. Partly from the telemetry seismometer thought, the new design adoptes the principal and subordinate micro-controller structure. A high resolution, high sampling rate, large buffer memory seismic signal acquisition system based on AT87C51 is described. Some advanced techniques such as Δ-Σ A/D converter, PGA, nonvolatile SRAM, RS-485 communication interface and instrumental design ideas are used in the overall layout. The main controller gets data by accessing the serial port of each geophone, which decreases the attenuation of useful signal, enhances the anti-interference ability, increases the signal-noise rate and apparently overcomes the bottle-neck effect resulted in the sampling process by using the general centralized seismography. The new design of digital geophone used in the occasion of high resolution seismic prospecting will pay an important roll in a new kind of seismography.
出处
《石油仪器》
1999年第5期1-4,53,共8页
Petroleum Instruments
基金
国家自然科学基金
关键词
地震检波器
可控波源
数据采集
数字式
地震勘探
digital geophone, digitalization, vibroseis, high resolution exploration, data acquisition
