基于经验模态分解消噪的光纤光栅解调系统  

FBG Demodulation System Based on EMD Denoise

作　　者：李志全[1] 曹平[1] 王亚男[1] 刘正君[1] 张景茹[1] 

机构地区：[1]燕山大学电气工程学院,河北秦皇岛066004

出　　处：《光子学报》2010年第8期1367-1371,共5页Acta Photonica Sinica

基　　金：国家自然科学基金(60877047);河北省自然科学基金(F2008000873)资助

摘　　要：为了提高光纤Bragg光栅解调系统的解调准确度,提出利用经验模态分解对信号进行滤波分析和降噪处理的方法.该方法将经验模态分解得到的固有模态函数,分为信号分量起主导作用模态与噪音分量起主导作用模态,并利用反映信号主要结构的模态对信号进行重构实现去噪.实验表明,解调系统输出信号能够识别出中心波长的位置,精确得到Bragg波长的漂移量,输出谱失真小、信噪比高.对温度实验数据进行曲线拟合,拟合线性度为0.998,提高了系统的解调准确度.In order to improve the accuracy of the fiber Bragg grating demodulation system,a denoising processing and filtering analysis method based on empirical mode decomposition is proposed.The intrinsic mode functions obtained by EMD are derived into signal component dominanting modes and noise component dominanting modes.Denoising can be achieved by reconstructing the signal using the modes reflecting the main structures of the signal.The experimental results show that the output signal of demodulation system can achieve identitfying the location of central wavelength and the Bragg wavelength shift accurately.The output spectrum has the features of less distortion and higher SNR.The curve fitting of temperature shows that the fitting linearity is 0.998,and the accuracy of demodulation system is greatly improved.

关 键 词：光纤光栅 经验模态分解 信号重构 噪音 

分 类 号：TN253[电子电信—物理电子学]