强度型光纤传感器的信号检测系统

本文阐述了一种可提高强度型光纤传感器测量精度的检测系统。该系统利用同一检测电路交替检测信号、参考通道的输出信号，并将信号、参考两通道的检测结果相除，从而消除了因发光二极管光源波动及检测电路系统不稳定所带来的误差。采用同步相关技术抑制了噪声，提高了输出信噪比。实验证明，当时间常数ＲＣ为０．０５Ｓ时，采用该检测系统可获得优于千分之一的零点稳定性和优于２×１０３的输出信噪比。

The Intensity-Modulated Optic Fiber Sensor Detection System

A deteion system for raisiny the accuracy of the mtensity-modulated optic fiber sensor is statcd. In this system, a reference channal and a signal channal are used to reduse the optical supply wave and the circait drift by the output of the reference channal being divided by the output of the signal channal.In order to raise signal-to-noise ratio,the Coherent detection is used in this system.In experiment, if the time Constant is 0.05s,the sytem have the zero point stabitility up to 1/1000 and the Signal-to-noise ratio up to 2×10 4。