基于小波降噪的光纤布拉格光栅波长高精度解调算法  

High-Precision Wavelength Demodulation Algorithm of Fiber Bragg Grating Based on Wavelet Denoising

作　　者：韩超 胡宾鑫 朱峰 宋广东 张华 高煜 Han Chao;Hu Binxin;Zhu Feng;Song Guangdong;Zhang Hua;Gao Yu(Laser Institute,Qilu University of Technology(Shandong Academy of Sciences),Jinan,Shandong 250300,China)

机构地区：[1]齐鲁工业大学(山东省科学院)激光研究所,山东济南250300

出　　处：《激光与光电子学进展》2022年第5期122-128,共7页Laser & Optoelectronics Progress

基　　金：山东省自然科学基金博士基金(ZR2019BEE019);山东省科学院青年博士基金(2020QN005);山东省深部冲击地压灾害评估工程实验室开放项目(LMYK-2021-010)。

摘　　要：针对传统波长解调算法在光纤布拉格光栅(FBG)在线监测系统检测精度不高、效率低的问题,提出了一种基于小波降噪的FBG波长高精度解调算法。首先,对小波降噪方法处理的光谱波形进行快速运算,得到新函数。然后,获得新函数对应的中心波长。最后,搭建了一套基于垂直腔面发射激光器的FBG变压器绕组温度在线监测系统,采用小波降噪算法对波长进行解调并间接得到温度数据。实验结果表明,相比直接寻峰、多项式拟合、高斯拟合算法,小波降噪算法具有速度快、稳定性好等优点,在70~90℃测量范围内,测温精度达到±0.04℃,波长解调的最大标准差小于1.67 pm,且该算法的运行效率高于常用的高斯拟合算法,可用于工业现场环境FBG的高精度实时在线监测系统。This study proposes a high-precisionwavelength demodulation algorithm of fiber Bragg grating(FBG)based on wavelet denoising to overcome the shortcomings of traditional wavelength demodulation algorithms in the online monitoring system of FBG,such as low detection accuracy and effectiveness.First,we perform rapid calculations on the spectral waveforms that are processed using the wavelet noise reduction method to generate a new function.Then,we obtain the center wavelength for the new function.Finally,a set of FBG transformer winding temperature online monitoring system based on a vertical-cavity surface-emitting laser is constructed;the wavelet noise reduction technique is used to demodulate the wavelength and indirectly acquire temperature data.The experiments show that the wavelet denoising technique outperforms the finding peaks directly,polynomial fitting,and Gaussian fitting algorithms in terms of speed and stability.In the temperature range of 70-90℃,the temperature measurement accuracy can reach±0.04℃.The wavelength demodulation’s highest standard deviation is less than 1.67 pm.Further,the operational efficiency of the algorithm is greater than that of the commonly used Gaussian fitting algorithm.Therefore,the algorithm may be used in the FBG’s highprecision real-time online monitoring system in the industrial environment.

关 键 词：光纤光学 光纤布拉格光栅 波长解调 小波降噪 卷积积分 寻峰算法 

分 类 号：TN253[电子电信—物理电子学]