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Sample entropy analysis of laser speckle fluctuations to suppress motion artifact on blood flow monitoring

Chinese Optics Letters 2022年第1期20卷 106-111页

作者： Sungchul Kim Evgenii Kim Eloise Anguluan Jae Gwan Kim Department of Biomedical Science&Engineering Institute of Integrated TechnologyGwangju Institute of Science and Technology(GIST)Gwangju 61005Republic of Korea Center for Bionics Biomedical Research InstituteKorea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea

Laser speckle imaging is a common technique to monitor blood *** fluctuations in speckle intensity can be related to the blood flow by calculating the speckle contrast,the ratio between the standard deviation of speckle fluctuations and the average ***,this simple statistic calculation is easily affected by motion *** this study,we applied sample entropy analysis instead of calculating standard deviations of the speckle *** to the traditional method,sample entropy-based speckle contrast increases linearly with flow rate but was shown to be more immune to sudden movements during an upper arm occlusion test.

关键词： laser speckle imaging sample entropy speckle contrast blood flow monitoring motion artifact

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Decoherence of fiber light sources using a single-trench fiber

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Chinese Physics B 2020年第12期29卷 281-285页

作者： Huahui Zhang Weili Zhang Zhao Wang Hongyang Zhu Chao Yu Jiayu Guo Shanshan Wang Yunjiang Rao School of Information and Communication Engineering University of Electronic Science and Technology of ChinaChengdu 611731China China Second Institute of Railway Engineering Group Co.LTD Chengdu 610031China

Decoherence of fiber laser sources is of great importance in imaging applications,and most current studies use ordinary multi-mode fibers(MMFs).Here,a newly designed single-trench fiber(STF)is investigated to reduce the spatial coherence of fiber light source and compared with *** bending two fibers with different turns,speckle contrast of a 0.8-m-long STF can be reduced from 0.13 to 0.08,while a 0.8-m-long MMF shows an inverse *** speckle contrast and decoupling-mode analysis,the reason of this inverse trend is ***,the STF supports more modes than the MMF due to its larger core ***,mode leak from the first core of the STF can couple to the second core when bending the ***,power distribution among high and low-order modes become more even,reducing the spatial coherence ***,in the MMF,high-order modes become leaky modes and decrease slightly when bending the *** work provides a new method to modulate coherence of light source and a new angle to study decoherence principle using special fibers.

关键词： single-trench fiber multi-mode fiber bending fiber speckle contrast

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