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研究了基于高频CO_2激光脉冲单侧写入的截面折变非对称型长周期光纤光栅(LPFG)高温特性及其在高温环境中的轴向应变特性。理论和实验表明在200～1000℃之间长周期光纤光栅的谐振峰漂移呈线性趋势;同时,在高温环境中其谐振峰随轴向应变也呈线性漂移,且不同谐振峰的温度和应变灵敏度也不同。利用这种新型长周期光纤光栅独特的高温应变特性可用一根光纤光栅实现对高温和应变的同时测量。
The high-temperature properties of cross-section asymmetric long-period fiber grating (LPFG) based on high-frequency CO_2 laser pulse unilateral writing and its axial strain characteristics under high temperature were studied. The theoretical and experimental results show that the resonance peak shift of long-period fiber gratings exhibits a linear trend at 200 ~ 1000 ℃. At the same time, the resonance peak shifts linearly with the axial strain at high temperature, and the temperature and strain sensitivity of different resonance peaks Also different. Utilizing the unique high-temperature strain characteristics of this new long-period fiber grating, simultaneous measurement of high temperature and strain can be achieved with a single fiber grating.