介绍了光纤布拉格光栅非本征型法布里珀罗干涉仪集成复用传感器的结构、应变和温度同时监测的原理;观察到光纤布拉格光栅反射谱和非本征型法布里珀罗干涉仪干涉谱间的串扰,用3dB带宽平均波长法减小了该串扰,提高了测量精度;将该传感器应用于三维编织复合材料的应变及温度同时监测.实验结果表明温度精度为±1℃,应变精度为±20 με,可满足实际应用的要求.

The structure and principle of a novel sensor with in-fibre Bragg grating (FBG) and extrinsic Fabry-Perot interferometer (EFPI) in series, used for simultaneous strain and temperature measurement, are presented. The cross-talk between the reflective spectra of the FBG and the EFPI interference spectra is observed which has been reduced by the method of averaging the wavelengths at the two points of 3 dB bandwidth to improve the accuracy for temperature measurement. This sensor has been applied to simultaneous strain and temperature measurement for 3-D braided composite materials. The experimental results show that this method has a strain accuracy of ±20 με and a temperature accuracy of 1 ℃, which can meet the requirements for practical applications.