基于分段傅里叶变换的激光自混合干涉速度测量
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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%.
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%.
引文
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[14]张玉燕.基于LD自混合干涉的位移及速度测量技术的研究[D].秦皇岛:燕山大学,2006.
[15]范方兵.全光纤干涉测速数据处理技术研究[D].南京:南京理工大学,2008.
[16] MAGNANI A,PESATORI A,NORGIA M.Realtime self-mixing interferometer for long distances[J].IEEE Transactions on Instrumentation&Measurement,2014.
[2] WANG W M,GRATTAN K T V,PALMER A W,et al.Self-mixing interference inside a single-mode diode laser for optical sensing applications[J].Journal of Lightwave Technology,1994,12(9):1577-1587.
[3]郭冬梅.相位调制型激光自混合干涉测量微纳米技术的研究[D].南京:南京师范大学,2007.
[4]黄贞.基于半导体激光自混合干涉的振动测量研究与应用[D].哈尔滨:哈尔滨工业大学,2014.
[5] JIANG C,ZHANG Z,LI C.Vibration measurement based on multiple self-mixing interferometry[J].Optics Communications,2016,367:227-233.
[6] DONATI S.Developing self‐mixing interferometry for instrumentation and measurements[J].Laser&Photonics Reviews,2012,6(3):393-417.
[7]徐军.单模VCSEL自混合测速、测距及三维图像技术的研究[D].合肥:中国科学技术大学,2006.
[8]何德勇.单模VCSEL自混合激光多普勒测速研究[D].中国科学技术大学,2008,63(7):1804-1809.
[9] SHINOHARA S,NAITO H,YOSHIDA H,et al.Compact and versatile self-mixing type semiconductor laser Doppler velocimeters with direction-discrimination circuit[J].IEEE Transactions on Instrumentation&Measurement,1989,38(2):574-577.
[10]刘盛刚.自混合干涉测速技术研究[D].绵阳:中国工程物理研究院,2009.
[11] NIKOLI'C M,LIM Y L,BERTLING K,et al.Multiple signal classification for self-mixing flowmetry[J].Applied Optics,2015,54(9):2193-8.
[12]倪家伟.全光纤激光干涉测速技术研究[D].南京:南京理工大学,2011.
[13]赵新才.激光干涉测速系统中的小波算法研究[D].成都:电子科技大学,2011.
[14]张玉燕.基于LD自混合干涉的位移及速度测量技术的研究[D].秦皇岛:燕山大学,2006.
[15]范方兵.全光纤干涉测速数据处理技术研究[D].南京:南京理工大学,2008.
[16] MAGNANI A,PESATORI A,NORGIA M.Realtime self-mixing interferometer for long distances[J].IEEE Transactions on Instrumentation&Measurement,2014.