基于间隙光纤光栅的微间隙与温度同时测量技术

间隙光纤光栅（g-FBG）兼具菲索干涉和相移光纤光栅(PSFBG)的特征，仿真研究和分析了g-FBG反射谱中菲索干涉谱型和相移光纤光栅谱型对微间隙和温度的敏感特性，提出了一种同时测量微间隙和温度的方法，并建立了测量模型。搭建g-FBG实验系统，测试了不同间隙下的反射谱，验证了仿真结果，数据分析表明微间隙测量误差小于±5 nm；制作g-FBG传感头，实现了位移和温度的同时测量，温度灵敏度为8.3 pm/℃，测量精度可达0.1 ℃。基于g-FBG的微间隙与温度同时测量技术具有精度高、体积小和设计灵活等优点。通过建立微间隙与温度的关联方程，可补偿由于温度变化对间隙测量的影响，实现温度无关的微间隙测量。

Abstract

Gap fiber Bragg grating (g-FBG) exhibits both Fizeau interference and phase-shifted fiber Bragg grating (PSFBG) spectrum. Their different sensitivities to micro-gap and temperature are demonstrated respectively, based on which a micro-gap and temperature simultaneous measurement method is proposed. The reflective spectra with different micro-gaps are tested by g-FBG experiments, which fits the simulation results. Data analysis shows that the micro-gap measurement error is less than ±5 nm. A g-FBG based sensor is made and simultaneous micro-gap and temperature measurement is obtained. Temperature measurement is achieved with a sensitivity of 8.3 pm/℃ and a low error of 0.1 ℃. This proposed g-FBG based simultaneous micro-gap and temperature measurement exhibits the advantages of high-accuracy, compact size, and flexible designing. With the related equation between temperature and micro-gap, temperature-induced gap change can be compensated and the temperature-independent micro-gap measurement is able to implement.

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胡军, 杨远洪, 刘学静. 基于间隙光纤光栅的微间隙与温度同时测量技术[J]. 中国激光, 2014, 41(11): 1108003. Hu Jun, Yang Yuanhong, Liu Xuejing. Gap Fiber Bragg Grating Based Micro-Gap and Temperature Simultaneous Measurement Technology[J]. Chinese Journal of Lasers, 2014, 41(11): 1108003.

基于间隙光纤光栅的微间隙与温度同时测量技术

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