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基于衍射光栅的FBG传感系统解调算法分析
引用本文:冯忠伟,张力,江琴,孙义斌.基于衍射光栅的FBG传感系统解调算法分析[J].光学技术,2011,37(6):709-712.
作者姓名:冯忠伟  张力  江琴  孙义斌
作者单位:北京长城计量测试技术研究所,北京,100095
基金项目:航空集团公司创新团队基金项目
摘    要:研究并实现了一种基于衍射光栅的FBG解调系统,针对该解调系统从理论上分析了光纤内的模式分布,分析了由FBG引起的模式间耦合效应。根据高斯光束经过该系统后的空间光强分布,采用多项式拟合的方法实现了反射光谱峰值定位算法。通过与高精度光谱仪的测量结果对比表明,该解调方法具有较高的波长解调精度和稳定性。由于系统中不存在扫描机构,该技术可以实现较高的动态扫描频率。

关 键 词:光纤光栅  衍射光栅  解调  高斯曲线拟合

Analysis of the demodulation algorithm for the FBG sensing system based on diffraction grating
FENG Zhongwei , ZHANG Li , JIANG Qin , SUN Yibin.Analysis of the demodulation algorithm for the FBG sensing system based on diffraction grating[J].Optical Technique,2011,37(6):709-712.
Authors:FENG Zhongwei  ZHANG Li  JIANG Qin  SUN Yibin
Institution:FENG Zhongwei,ZHANG Li,JIANG Qin,SUN Yibin(Beijing Changcheng Institute of Metrology and Measurement,Beijing 100095,China)
Abstract:A fiber Bragg grating demodulation system based on diffraction grating is researched and realized,the mode field distribution and the coupled mode theory are employed to interpret the light propagation inside the fiber.Polynomial fit algorithm is realized to locate the peak of the reflected spectrum as the Gauss field maintains its profile of intensity when it travels through the system.The demodulation technique is proved to be with high accuracy and high stability by the result comparison with high accura...
Keywords:fiber Bragg grating(FBG)  diffraction grating  demodulation  Gauss curve fit  
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