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超短曝光时间下激光散斑对比度速度分析

Speed Analysis of Laser Speckle Contrast with Ultra-Short Exposure Time

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摘要

采用0.205 ms的曝光时间,研究了观测速度范围包含去相关区域和未去相关区域时的散斑对比度与观测物速度间的关系。结果表明,利用对比度随取样帧数的变化趋势,并结合时间序列散斑图像相关系数曲线,可以在复杂环境下正确区分两个区间内的速度大小;同时,选用适当散斑图像帧数进行对比度计算,可以同时为探测大速度和小速度区间的速度变化提供较高灵敏度。

Abstract

With the exposure time of 0.205 ms, the relationship between the object observation speed and the speckle contrast when the observable speed range includes a decorrelation area and a non-decorrelation area is investigated. The results indicate that, based on the variance trend of contrast with sampling frame and the correlation coefficient curve of time sequence speckle image, one can distinguish the speed difference between these two areas under complicated environment. Meanwhile, by choosing the suitable number of speckle image frames, one can provide a higher sensitivity for detecting the speed variance in the small speed range and the large speed range.

Newport宣传-MKS新实验室计划
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中图分类号:TN247

DOI:10.3788/aos201838.0411008

所属栏目:成像系统

基金项目:国家自然科学基金(61605092,61575097)、山西大学量子光学与量子器件国家重点实验室开放课题(KF201605)

收稿日期:2017-09-26

修改稿日期:2017-11-11

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安晓英:南开大学现代光学研究所, 天津 300350南开大学光学信息技术科学教育部重点实验室, 天津 300350
张茹:南开大学现代光学研究所, 天津 300350南开大学光学信息技术科学教育部重点实验室, 天津 300350
宋丽培:南开大学现代光学研究所, 天津 300350南开大学光学信息技术科学教育部重点实验室, 天津 300350山西大学量子光学与光量子器件国家重点实验室, 山西 太原 030006
武鹏飞:南开大学现代光学研究所, 天津 300350南开大学光学信息技术科学教育部重点实验室, 天津 300350

联系人作者:宋丽培(gm_imo@nankai.edu.cn)

备注:安晓英(1994-),女,硕士研究生,主要从事光学成像方面的研究。E-mail: axy@mail.nankai.edu.cn

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引用该论文

An Xiaoying,Zhang Ru,Song Lipei,Wu Pengfei. Speed Analysis of Laser Speckle Contrast with Ultra-Short Exposure Time[J]. Acta Optica Sinica, 2018, 38(4): 0411008

安晓英,张茹,宋丽培,武鹏飞. 超短曝光时间下激光散斑对比度速度分析[J]. 光学学报, 2018, 38(4): 0411008

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