基于可调F-P滤波器的光纤光栅传感器阵列查询技术

Technique for Fiber Bragg Grating Array Interrogation with a Tunable Fabry-Perot Filter

利用可调 F- P滤波器对四个光纤光栅组成的传感器阵列进行波长扫描 ,借助示波器和探测器对滤波光束的时序分布进行观察 ,实现地址查询。比较波长漂移前后传感阵列的反射谱 ,可用于解调 ,实验结果与预期值基本一致。选用反射率相差悬殊的光栅作传感元 。

A four elements fiber Bragg grating sensing arrays has been interrogated using a tunable Fabry-Perot filter acted as a wavelength scanner and an oscilloscope and a photodector to monitor the distribution of the transmitted intensity in time domain. The sensing signal can be demodulated by comparing the shifted and unshifted spectra and the results are in good agreement with the prospected values. The measured range of the sensing elements can be improved by choosing the gratings with larger reflectivity difference.