GA／SDS结合最小二乘拟合的FBG图像解调算法  

Demodulation algorithm of FBG image combining GA/SDS with least squares fitting

作　　者：鲍吉龙[1] 徐才[2] 郑德春[1] 吴都健[2] 

机构地区：[1]宁波工程学院电子与信息工程学院,浙江宁波315016 [2]华东理工大学信息科学与工程学院,上海200237

出　　处：《光通信技术》2008年第6期57-60,共4页Optical Communication Technology

基　　金：浙江省科技厅项目基金(2007R40G2290003)资助;宁波市自然科学基金(2006A610004)资助

摘　　要：针对FBG图像解调中的核心问题通过计算FBG图像中光斑的位移变化达到计算FBG波长变化的目的,提出了一种GA/SDS结合最小二乘拟合的解调算法。采用GA/SDS算法对FBG图像进行像素级解调,兼顾了精度和速度的要求。在此基础上结合最小二乘拟合算法使解调精度达到亚像素级。实验结果表明:算法精度逼近理论值,速度可以满足实时性的要求。To solve the problem of the demodulation of FBG image which converts the variation of FBG wavelength into the displace of FBG spot, a algorithm combined GA/SDS with least squares fitting is proposed. Firstly, this approach utilizes GA/SDS to demodulate the FBG image by the precision of pixel level, which satisfies to the requirement of precision and speed. Then the precision is improved to sub-pixel level by using the algorithm of least squares fitting. Laboratory simulations demonstrate that the algorithm suits for demodulating the FBG image. The precision can approach to the theoretical precision and the speed satisfies to the standard of real-time in the project.

关 键 词：光纤布拉格光栅 遗传算法 块匹配 最小二乘拟合 解调 平均绝对误差 

分 类 号：TN929.11[电子电信—通信与信息系统]