基于复合波长参考的温度稳定光纤光栅传感解调研究

为实现温度稳定的光纤光栅传感解调，提出了综合使用法布里-珀罗(F-P)标准具和乙炔气室进行实时复合波长参考的校正方法。分析了F-P标准具透射光谱和乙炔气室吸收光谱的温度漂移特性。建立实验系统，测试了F-P标准具透射光谱的温度漂移特性，实验显示F-P标准具谱线平均温度灵敏度为1.16 pm/℃，谱线温度重复性误差可达13.0 pm。进行了基于F-P标准具单独参考和基于复合波长参考的解调温度稳定性实验，实验结果表明0 ℃~55 ℃的高低温循环，基于F-P标准具单独参考的解调值变化范围为±32.7 pm，标准差为20.7 pm，基于复合波长参考的解调值变化范围为±1.2 pm，标准差为0.39 pm，解调值变化范围温度稳定性提高了27倍。

Abstract

In order to realize temperature-stable fiber Bragg grating (FBG) sensing demodulation, a calibration method of real-time composite wavelength references using Fabry-Pérot (F-P) etalon and acetylene gas cell is proposed. The temperature drift properties of F-P etalon transmitted spectrum and acetylene gas cell absorption spectrum are analyzed. The experiment system is developed to test temperature drift property of F- P etalon transmitted spectrum. The experiment shows that the average temperature sensitivity of F-P etalon spectral line is 1.16 pm/℃ and the temperature repeatability error can be up to 13.0 pm. Temperature stability of demodulation both using F-P etalon as wavelength reference and composite wavelength references is studied. The experimental results show that under temperature cycle from 0 ℃ to 55 ℃, the range of variation using single wavelength reference is ±32.7 pm, and the standard deviation is 20.7 pm. However, the range of variation using composite wavelength references can be ± 1.2 pm, and the standard deviation is 0.39 pm. The temperature stability of variation range increases 27 times.

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江俊峰, 何盼, 刘铁根, 刘琨, 王双, 潘玉恒, 俞琳, 闫金玲. 基于复合波长参考的温度稳定光纤光栅传感解调研究[J]. 光学学报, 2015, 35(10): 1006005. Jiang Junfeng, He Pan, Liu Tiegen, Liu Kun, Wang Shuang, Pan Yuheng, Yu Lin, Yan Jinling. Research of Temperature-Stable Fiber Bragg Grating Sensing Demodulation Based on Composite Wavelength References[J]. Acta Optica Sinica, 2015, 35(10): 1006005.

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