基于分段傅里叶变换的激光自混合干涉速度测量  

Laser self-mixing interference velocity measurement based on segmental Fourier transform

作　　者：张秀艳[1] 刘珈池 顾婉莹 Zhang Xiuyan;Liu Jiachi;Gu Wanying(School of Electrical Engineering and Information,Northeast Petroleum University,Daqing 163318,China)

机构地区：[1]东北石油大学电气信息工程学院

出　　处：《国外电子测量技术》2018年第11期32-36,共5页Foreign Electronic Measurement Technology

基　　金：东北石油大学研究生创新科研项目(YJSCX2016-028NEPU)资助

摘　　要：在利用激光自混合干涉进行速度测量时,为解决傅里叶变换在求解物体做非匀速运动时无法获得其速度随时间变化的情况,提出了基于分段傅里叶变换的方法对速度曲线进行重构。首先根据物体运动的参数,确定分段傅里叶变换窗口的大小。然后通过提取频谱峰值获得每一段傅里叶变换的多普勒频移,从而得到多普勒频移随时间变化的曲线,最后通过条纹方向的判断和速度计算公式,即可求解出物体速度随时间变化的曲线。仿真结果表明,在弱反馈和适度反馈下,该方法简单易实现,具有较高的测量精度,重构的相对误差小于2%。In laser self-mixing interference(SMI)velocity measurement,in order to solve the problem that the object’s velocity changing with time cannot be obtained when Fourier transform is used for non-uniform motion,a method based on the segmental Fourier transform is proposed to reconstruct the velocity curve.First,according to the parameters of the object motion,the size of the segmental Fourier transform window is determined.Then,the Doppler shift of each section of the Fourier transform is obtained by extracting the peak value of the spectrum,thereby the curve of the Doppler shift with time is obtained.Finally,by determining the fringes’ direction and the velocity calculation formula,the velocity changing with time can be solved.The simulation results show that under weak feedback and moderate feedback,the method is simple and easy to implement,with high measurement accuracy,and the relative error of reconstruction is less than 2%.

关 键 词：自混合干涉 速度测量 傅里叶变换 多普勒频移 

分 类 号：TN249[电子电信—物理电子学]