利用全光纤干涉解调技术的光纤光栅复用传感系统

Multiplexed fiber Bragg grating sensing system based on a novel demodulation technique using an all-fiber interferometer

提出了一种用于光纤光栅传感波长检测的新方法。系统采用全光纤Mach Zehnder干涉仪,运用动态的自参考相位检测方式,结合微机实时处理技术,实现了对三点复用传感器的高分辨率(0.99pm)解调,单点测量范围达3.32nm。系统结构简单、成本低,可以同时检测静态和低频动态信号。

A novel method of detecting wavelength shift for fiber Bragg grating sensing application is proposed. The system, which employs an all-fiber Mach-Zehnder interferometer and adopts dynamic self-reference phase measuring technique, has successfully interrogating three-points-multiplied sensors by virtue of the real-time computer processing technique with high resolution of 0.99pm and large measurable range of 3.32nm for single point. This system can detect both static and dynamic signal and has a merit of simple structure and low cost.