Comparison of laser Doppler and laser speckle contrast imaging using a concurrent processing system

Sun, Shen and Hayes-Gill, Barrie R. and He, Diwei and Zhu, Yiqun and Huynh, Nam T. and Morgan, Stephen P. (2016) Comparison of laser Doppler and laser speckle contrast imaging using a concurrent processing system. Optics and Lasers in Engineering, 83 . pp. 1-9. ISSN 0143-8166

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Abstract

Full field laser Doppler imaging (LDI) and single exposure laser speckle contrast imaging (LSCI) are directly compared using a novel instrument which can concurrently image blood flow using both LDI and LSCI signal processing. Incorporating a commercial CMOS camera chip and a field programmable gate array (FPGA) the flow images of LDI and the contrast maps of LSCI are simultaneously processed by utilizing the same detected optical signals. The comparison was carried out by imaging a rotating diffuser. LDI has a linear response to the velocity. In contrast, LSCI is exposure time dependent and does not provide a linear response in the presence of static speckle. It is also demonstrated that the relationship between LDI and LSCI can be related through a power law which depends on the exposure time of LSCI.

Item Type: Article
Keywords: Laser Doppler; Laser speckle contrast; Blood flow imaging; CMOS Sensor; Field programmable gate array
Schools/Departments: University of Nottingham UK Campus > Faculty of Engineering
Identification Number: https://doi.org/10.1016/j.optlaseng.2016.02.021
Depositing User: Morgan, Steve
Date Deposited: 29 Jun 2016 10:12
Last Modified: 18 Sep 2016 19:35
URI: http://eprints.nottingham.ac.uk/id/eprint/34459

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