为了快速而准确地获得应变信息, 针对基于法布里-珀罗(F-P)滤波器的光纤传感应用系统, 研究和对比分析了几种光纤布喇格光栅(FBG)光谱信号的中心波长变动计算方法。根据FBG反射光谱的功率分布波形对称特性, 提出一种优化查找中心波长值的算法, 利用相邻2次采样的光谱波形峰值的两侧数据, 依据最小二乘法原理进行优化计算获得中心波长的替代值。实验结果表明, 以此计算FBG光谱中心波长值变动量不大于1个采样点。

In order to obtain the strain information quickly and accurately, several methods for calculating the central wavelength variation of fiber Bragg grating(FBG) spectrum signals are studied and analyzed based on the fiber sensing application system of Fabry Perot(F-P) filter. According to the symmetrical characteristics of the power distribution waveform of the FBG reflection spectrum, an algorithm for optimizing the central wavelength value is proposed. Based on the two side data of the peak value of the two adjacent sampling spectral waveforms, the alternative value of the central wavelength is obtained by the optimization calculation according to the principle of the least square method. The experimental results show that the variation of the central wavelength of FBG spectrum calculated by this method is not more than one sampling point.