基于光放大的光纤Fizeau应变传感器频分复用系统

Frequency-multiplexed fiber-optic Fizeau strain sensor system based on optical amplification

提出了一种可频分复用基于光放大的光纤Fizeau应变传感器的方法 ,从原理上解决了现有光纤Fabry Perot传感器固有的两大弱点 :信号弱和复用难 .利用掺铒光纤的放大作用 ,既形成宽带光源 ,又放大了微弱的信号 .描述了该应变传感器系统的结构、原理及实验结果 .实验表明该复用传感器应变测量精度可达± 10 με,可满足实际应用的要求 .

A novel method for multiplexing fiber-optic Fizeau strain sensors based on optical amplification is proposed and demonstrated for the first time to our knowledge. This method overcomes the two intrinsic disadvantages of fiber-optic Fabry-Perot strain sensors, i.e. weak signal and difficult multiplexing. Also, the amplified spontaneous emission and optical amplification of the Erbium-doped fiber pumped by a 980nm laser diode are used simultaneously. The structure, principle and experimental results of the sensor system are described in this paper. A strain accuracy of ～±10με has been achieved, which can meet the practical requirement.