峰值定位在处理光纤布拉格光栅(FBG)反射信号的过程中至关重要。针对FBG反射信号的特点, 为了解决峰值定位过程中峰值重叠的问题, 提出一种适用于FBG反射信号的寻峰方法。采用基于连续小波变换的脊线寻峰算法, 研究了连续小波变换中小波系数与FBG反射信号的对应关系, 将脊线寻峰算法进行了改进并运用于峰值重叠FBG反射信号的峰值定位。实验结果表明, 改进的小波脊线寻峰算法可以有效解决FBG反射信号的波峰重叠问题, 减小了寻峰误差, 提高了峰值定位的精确度。

Peak localization is a critical step in processing fiber Bragg grating (FBG) reflected signal. Aiming at the feature of FBG reflected signal, we propose a peak detecting algorithm applied to FBG reflected signal to solve the peak overlapping problem in peak localization. According to the ridge peak detecting algorithm based on continuous wavelet transform, the correspondence between wavelet coefficients and FBG reflected signals is analyzed, and the ridge peak detecting algorithm is improved to find the peak of overlapped FBG reflected signal. The experimental result shows that the improved wavelet ridge peak detecting algorithm can effectively solve the peak overlapping problem of FBG reflected signal. Through this algorithm, the error of peak detecting can be reduced, and the accuracy of peak localization can be improved.