红外与激光工程
2022, 51(8): 20220299
Author Affiliations
Abstract
1 Key Laboratory of Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Imaging through scattering media via speckle autocorrelation is a popular method based on the optical memory effect. However, it fails if the amount of valid information acquired is insufficient due to a limited sensor size. In this Letter, we reveal a relationship between the detector and object sizes for the minimum requirement to ensure image reconstruction by defining a sampling ratio R, and propose a method to enhance the image quality at a small R by capturing multiple frames of speckle patterns and piecing them together. This method will be helpful in expanding applications of speckle autocorrelation to remote sensing, underwater probing, and so on.
speckle correlation dynamic scattering media remote sensing Chinese Optics Letters
2020, 18(4): 042604
Author Affiliations
Abstract
Key Laboratory for Quantum Optics and Center for Cold Atom Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, P. R. China
We observed a phenomenon that different scattering components have different decorrelation time. Based on decorrelation time difference, we proposed a method to image an object hidden behind a turbid medium in a reflection mode. In order to suppress the big disturbance caused by reflection and back scattering, two frames of speckles are recorded in sequence, and their difference is used for image reconstruction. Our method is immune to both medium motions and object movements.
Decorrelation time dynamic scattering media speckle autocorrelation memory effect reflection mode Journal of Innovative Optical Health Sciences
2019, 12(4): 1942001
重庆大学光电工程学院光电技术及系统教育部重点实验室, 重庆 400030
蛋白质在生命活动中起着重要作用, 一直是人们研究的热点, 动态光散射技术由于其快速、准确、对样品无损坏等优点, 而成为研究蛋白质的重要手段之一。本文采用美国布鲁克海文公司提供的BI-200SM激光散射仪对浓度分别为0.1 mg/mL、0.5 mg/mL、1 mg/mL、5 mg/mL、10 mg/mL的牛血清白蛋白溶液进行动态光散射测量, 讨论了光强自相关曲线和粒径测量的相对误差随浓度的变化关系, 研究了蛋白浓度对测量结果的影响。实验结果表明, 在一定浓度范围内, 光强自相关函数曲线的稳定性随浓度增加而增加, 而自相关曲线的迟豫时间随着溶液浓度的增加而减小, 粒径测量的相对误差也随着浓度的增加而逐渐减小。
动态光散射 牛血清白蛋白 自相关函数曲线 弛豫时间 稳定性 dynamic scattering bovine serum albumin the autocorrelation function curve delay time
1 Jinkou Branch of Wuhan Ordnance Noncommissioned Officer Academy, Wuhan Jinkou 430208, CHN
2 Luoyang Technology College, Luoyang 471003, CHN
