基于小波变换阈值的光干涉信号去噪  

Denoising optical interferometry signal based on wavelet transform threshold

作　　者：郭常盈[1] 郑珂[1] 

机构地区：[1]南阳理工学院计算机科学与技术系,南阳473004

出　　处：《激光技术》2009年第5期506-508,共3页Laser Technology

基　　金：国家自然科学基金资助项目(60574098)

摘　　要：为了研究光反馈自混合干涉信号的去噪方法,根据光反馈自混合干涉信号的特点,在多分辨分析小波阈值去噪的基础上,采用了一种改进的阈值函数方法。新阈值函数克服了传统硬阈值函数不连续的缺点,解决了软阈值函数中存在的恒定偏差,并且具有软硬阈值函数不可比拟的灵活性。利用3种阈值函数对光自混合干涉信号进行去噪处理,通过对仿真波形和实测波形的处理,结果表明,无论是在去噪效果上,还是在信噪比增益和最小均方误差意义上,均优于传统的软硬阈值方法。In order to denoise the optical feedback self-mixing interferometric signal, an improved threshold function is proposed according to the characteristics of the signal after analyzing wavelet threshold denoising method. The new threshold function overcomes the shortcomings of the hard threshold with discontinuous function and solves the problem of the permanent bias in soft threshold function, and it is more flexible than the soft threshold and hard threshold function. The optical self-mixing interferometric signal is denoised by means of three threshold functions. Denoising simulation and measured signals prove that the improved threshold method is better than traditional hard and soft methods not only in denoising effect, but also in mean square error performance and signal-to-noise ratio gain.

关 键 词：傅里叶光学与光信号处理 信号去噪 小波变换 光反馈自混合干涉 阈值函数 

分 类 号：O436.1[机械工程—光学工程]