The aim of this article is to introduce an innovative algorithm for the calculation of the shift of the maximum reflectivity wavelength of a Fiber Bragg Grating experiencing an applied strain. An accurate and precise evaluation of the FBG spectrum displacement is crucial for determining the amount of the physical quantity inducing such perturbations. The proposed method is based on the Fast Fourier Transform based Cross Correlation function. Such method is compared to Least Squares Fitting (LSF) and the centroid algorithms, pointing out remarkable improvements in accuracy, precision, and time consumption performance. In addition, a further improvement of the proposed algorithm is introduced. It consists in an iteratively performed Cross Correlation algorithm. It has been proved that such improvement leads to estimations characterized by better accuracy and precision, thanks also to a considerable reduction of the peak-locking effect due to the FBG spectral resolution.

本文的目的是介绍一种创新算法，用于计算经受外加应变的光纤布拉格光栅的最大反射率波长的偏移。FBG频谱位移的准确准确评估对于确定引起此类干扰的物理量至关重要。所提出的方法基于基于快速傅立叶变换的互相关函数。将该方法与最小二乘拟合（LSF）和质心算法进行了比较，指出了准确性，精度和时间消耗性能的显着提高。另外，对提出的算法进行了进一步的改进。它包含一个迭代执行的互相关算法。