改进小波阈值去噪方法处理FBG传感信号

摘要

In order to gain the wavelength of fiber Bragg grating sensor system precisely,by analyzing the shortcoming of traditional methods,an improved threshold selection strategy is proposed,and a new threshold function is built to deal with FBG signal.The reasonable selection of wavelet basis and decomposition scale can improve the performance of de-noising.A method is put forward about wavelet basis and decomposition scale.The result of simulation and ex-periment show that the signal noise ratio(SNR)can increase by 2dB to 4dB compared with the traditional soft thresh-old and hard threshold method.While compared with the reference method,the SNR improves 1.5 dB.This method can meet the need of precise demodulation FBG wavelength.%为了精确获得光纤布拉格光栅（FBG）传感系统的波长漂移，通过分析传统阈值和阈值函数存在的不足，提出改进阈值选取策略，并构建一种新的阈值函数处理FBG信号；小波基和分解尺度的合理选取提升小波去噪性能，本文提出确定小波基和分解尺度的方法；仿真与实验结果表明，与传统软硬阈值方法相比，本文所提方法信噪比（SNR）提升2～4 dB；与本文文献所提方法相比，信噪比提高了1.5 dB。满足精确解调FBG中心波长的需要。