一种微振动光纤传感系统信号预处理电路

摘要

Laser noise is a significant cause of system noise of long distance micro-vibration fiber sensing system. For suppressing this noise,a preconditioning circuit which transferred a photoelectric current into two differential signals was designed. Through a pair-transistor structure one photoelectric current was converted into two differential currents and then two differential voltage signals by the circuit. The simulation results show the circuit successfully outputs two differential signals and has good bandwidth,gain and signal processing capability.%长距离分布式微振动光纤传感系统的系统噪声的重要产生原因是光源噪声.为了消除这类噪声,设计了预处理电路将一路光电信号转化为两路差分信号.电路将输入的光电流通过时管结构形成差分电流再分别转换成电压信号输出.仿真结果显示该电路可成功的输出两路差分信号,且带宽、增益和信号处理能力都比较强.