一种改进小波阈值函数的光纤光栅传感信号去噪方法

光纤布拉格光栅( FBG)传感信号中存在的噪声严重影响了其中心波长的检测精度，因此必须进行去噪处理。本文针对传统的小波软、硬阈值函数去噪的不足，提出了一种改进的对数阈值函数，并确定了最优的小波基和分解尺度。仿真表明，本文提出的改进阈值函数去噪后信噪比( SNR)较大，均方根误差( RMSE)较小，其中信噪比比传统的软、硬阈值方法提高了1.5 dB~4 dB。最后通过实验验证了本文方法的去噪效果。

Improved Threshold De-noising Method of Fiber Bragg Grating Sensor Signal based on Wavelet Transform

Noise in the fiber Bragg grating( FBG) sensing has seriously affected the detection precision of the center wavelength,and it should be processed to reduce noises. A modified logarithmic threshold method is adopted,and the reasonable wavelet basis and decomposition level are determined by analyzing the disadvantages of traditional soft and hard wavelet threshold de-noising methods. The simulation results show that the improved method can obtain the maximum signal-to-noise ratio ( SNR ) and the minimum root mean square error ( RMSE ) , and the SNR improves 1.5 to 4 dB than traditional methods. The de-noising effect of this method is proved by experiments.