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

Sun, Shen; Hayes-Gill, Barrie R.; He, Diwei; Zhu, Yiqun; Huynh, Nam T.; Morgan, Stephen P.


Shen Sun

Professor of Electronic Systems and Medical Devices

Diwei He

Assistant Professor

Nam T. Huynh


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.


Sun, S., Hayes-Gill, B. R., He, D., Zhu, Y., Huynh, N. T., & Morgan, S. P. (2016). Comparison of laser Doppler and laser speckle contrast imaging using a concurrent processing system. Optics and Lasers in Engineering, 83,

Journal Article Type Article
Acceptance Date Feb 25, 2016
Online Publication Date Mar 11, 2016
Publication Date Aug 1, 2016
Deposit Date Jun 29, 2016
Publicly Available Date Jun 29, 2016
Journal Optics and Lasers in Engineering
Print ISSN 0143-8166
Electronic ISSN 0143-8166
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 83
Keywords Laser Doppler; Laser speckle contrast; Blood flow imaging; CMOS Sensor; Field programmable gate array
Public URL
Publisher URL


OLE doppler speckle comparison 2016.pdf (1.3 Mb)

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