光纤式结冰传感器微弱信号检测电路的实现

摘要

The signal from light intensity modulation by ice of the fibre-optical icing sensor (FIS)is weak,and interference sources can be everywhere. After comparing the commonly used weak signal detection methods (WSD) ,this paper designed a reduced-bandwidth high-performance lock-in amplifier (LIA) by combining synchronous integrator and correlator and established a mathematical model of nioseproof feature of the LIA. A high-reliability icing detection system (IDS) was set up. Icing experiments results show that the LIA circuit can effectively get the weak signal of the FIS.%光纤式结冰传感器(FIS)中冰层对光强的调制作用微弱,且干扰源较多.通过比较常用的微弱信号检测方法(WSD),设计了由同步积分和相关检测相结合进行带宽压缩的高性能锁定放大器(LIA),并对该LIA抗干扰原理建立了数学模型.基于该LIA构建了高可靠性结冰探测系统(IDS).结果表明锁定检测电路对FIS微弱信号能有效提取.