双路偏振结构的激光多普勒测速系统  

Laser Doppler velocimetry with a dual polarization structure

作　　者：陶善静 甄胜来[1,2] 方健[1,2] 陈鑫[1,2] 吕韬 俞本立[1,2] TAO Shan-jing;ZHEN Sheng-lai;FANG Jian;CHEN Xin;LV Tao;YU Ben-Li(Key-Laboratory of Opto-Electronic Information Acquisiton and Manipulation,Ministry of Education,Anhui University,Hefei 230601,China;Information Materials and Intelligent Sensing-Laboratory of Anhui Province,Anhui University,Hefei 230601,China;Anhui Zhibo Optoelectronic Technology Co.,Ltd,Hefei 230088,China)

机构地区：[1]安徽大学、光电信息获取与控制教育部重点实验室,安徽合肥230601 [2]安徽大学、信息材料与智能感知安徽省实验室,安徽合肥230601 [3]安徽至博光电科技股份有限公司,安徽合肥230088

出　　处：《中国光学（中英文）》2023年第4期753-764,共12页Chinese Optics

基　　金：安徽省重点研究与开发计划(No.202104a05020059);安徽省优秀科研创新团队(No.2022AH010003)。

摘　　要：为了消除光束倾角带来的不确定性,本文建立了一种双路偏振式激光多普勒测速系统。该系统使用双光束双探头结构来探测物体的运动信息。首先,通过转动实验精确获得双光束间的夹角大小,对于任意光束倾角,本文采用双探头装置收集运动物体表面的散射光束,结合双路偏振式光路结构,得到两路干涉信号的多普勒频移。然后,创新性采用了细化分帧算法对两路干涉信号进行实时解调,通过两路速度分量的合成得到物体真实速度。实验结果表明:速度在10 mm/min~1500 mm/min范围内,测量值与理论值之间的平均误差可以达到1%~5%。在非平稳运动过程中,通过细化分帧算法修正后的v-t图像RMSE均值为1.19 mm/min。该系统结构满足速度测量的稳定可靠、精度高、抗干扰能力强等要求。In order to eliminate the uncertainty caused by the inclination of a beam,a dual polarization laser Doppler velocimetry system is established.We use a structure with two beams and two probes to detect the motion of the object.Firstly,the angle between the two beams is obtained by a calibration experiment.For any beam inclination,the scattered beam on the surface of a moving object is collected by a dual-probe device,and the Doppler shift of the two interference signals is obtained by combining the dual polarization optical path structure.Then,the refined framing algorithm is applied to demodulate the two interference signals in real time.The real speed of the object is obtained through the synthesis of the two speed components.The experimental results show that the average deviation between the measured value and the theoretical value can reach 1%−5%when the speed is within the range of 10 mm/min~1500 mm/min.In the process of non-stationary motion,the mean RMSE of the v-t image corrected by the refining frame segmentation algorithm is 1.19 mm/min.The system’s structure meets the requirements of stability and reliability,high precision and strong anti-interference ability in speed measurement.

关 键 词：激光多普勒测速 双路偏振 细化分帧 双探头 

分 类 号：TN29[电子电信—物理电子学]