基于数字相关匹配的光纤光栅非对称反射峰解调算法研究

光纤布拉格光栅(FBG)在封装时易出现非对称反射峰,传统拟合方式对此现象解调误差大.针对这一问题提出了一种基于数字相关匹配的光纤光栅解调新算法.采用Matlab仿真和水浴实验对此算法进行了检验,证明该算法的可行性及有效性.实验结果表明:在FBG存在非对称反射峰现象时,所提出的算法比传统高斯拟合算法误差减小约67％.基于数字相关匹配的光纤光栅解调算法扩大了解调算法的运用范围,提高了非对称峰时的解调精度,保持了光纤光栅的有效传感.

Research on FBG Asymmetric Reflection Peak Demodulation Algorithm Based on Digital Correlation Matching

The asymmetrical reflection peaks are easy to appear when fiber Bragg grating (FBG) is packaged and the conventional fitting method has a large error in demodulation. In this paper, a new algorithm of fiber Bragg grating demodulation based on digital correlation matching is proposed to solve this problem. The effectiveness and feasibility of the new algorithm are studied by the numerical simulations and water-bath experiment. The experimental results show that the error of this algorithm is about 67% less than that of the conventional Gauss fitting algorithm under the condition of asymmetrical reflection peak. The algorithm of fiber grating demodulation based on digital correlation matching enlarges the application range of demodulation algorithm, improves the demodulation accuracy of asymmetrical reflection peaks, and maintains the effectiveness of FBG sensing.