微震动测试系统抗噪声干扰技术研究

Study on the Antidisturbing Technology of the Micro Seismic Measurement System

详细分析了微震动测试系统的各种噪声源。通过建立固有噪声的电路模型、计算系统的噪声系数、分析噪声系数特点 ,设计了与压阻式震动传感器噪声匹配的的低噪声前置放大器。在分析干扰噪声的特点的基础上 ,设计了防电磁干扰的屏蔽系统。

In the paper, most kinds of noise source of micro seismic measurement system are analyzed in detail. By modeling the circuit of inherent noise, calculating the noise coefficient of the system and analyzing the characteristic of noise coefficient, a kind of low noise preamplifier matching the piezoresistance seismic sensor is designed. At the same time, a kind of sheltery system preventing electromagnetic disturbance is designed on the basis of researching the characteristic of disturbing noise.