基于双阶涡旋光束的旋转测速精度提升方法  

Method for Improving the Accuracy of Rotational Velocimetry Based on Double-Mode Vortex Beam

作　　者：王泓洋 高冬阳 陈寰 张子静[1] 张延相 赵远[1] WANG Hongyang;GAO Dongyang;CHEN Huan;ZHANG Zijing;ZHANG Yanxiang;ZHAO Yuan(School of Physics,Harbin Institute of Technology,Harbin 150001;Shanghai Aerospace Control Technology Institute,Shanghai 201109;Infrared Detection Technology Research&Development Center of CASC,Shanghai 201109)

机构地区：[1]哈尔滨工业大学物理学院,哈尔滨150001 [2]上海航天控制技术研究所,上海201109 [3]中国航天科技集团有限公司红外探测技术研发中心,上海201109

出　　处：《飞控与探测》2023年第6期45-50,共6页Flight Control & Detection

基　　金：中国航天科技集团公司第八研究院产学研合作基金(SAST2022-081);国家自然科学基金(62075049)。

摘　　要：涡旋光束因其独特的螺旋型波前结构,在对旋转物体探测时会产生与转速成正比的旋转多普勒频移,双阶涡旋光束的转速测量精度是单阶的2倍,但探测过程的噪声干扰会引起测量精度的下降。首先,通过分析双阶涡旋光束的旋转物体速度测量机理,给出测量精度影响因素分析。其次,在给出测量系统设计的基础上设计物体转速提取算法思路。最终,对高斯噪声、乘性噪声、探测器累积时间和光束模式纯度这四种情况对于测速精度的影响进行分析。结果表明,高阶双阶涡旋光束能有效提升噪声环境下的测速精度,提高模式纯度至94%以上,探测器累积时间控制在0.49s以上可以获得更好的测速精度。Due to its distinctive spiral wavefront structure,the vortex beam produces a rotational Doppler shift proportional to the rotational velocity when detecting rotating objects.The velocity measurement accuracy of a double-mode vortex beam is twice that of a single-mode vortex beam,but the noise interference during the detection process causes a decrease in measurement accuracy.First,a comprehensive analysis of the mechanisms involved in measuring the velocity of rotating objects using a dual-mode vortex beam is undertaken,elucidating the various factors influencing measurement accuracy.Secondly,the object velocity extraction algorithm is designed based on the measurement system design.Finally,the effects of four factors,Gaussian noise,multiplicative noise,detector accumulation time and beam mode purity,on velocity measurement accuracy are analyzed.The results indicate that the high-order dual-mode vortex beam effectively improves velocity measurement accuracy in noisy environments.Moreover,it achieves a mode purity improvement of 94%or more.Additionally,optimizing the control of detector accumulation time to exceed 0.49s yields superior velocity measurement accuracy.

关 键 词：涡旋光束 旋转多普勒效应 噪声环境 测速精度 模式纯度 

分 类 号：O439[机械工程—光学工程]