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Proceedings Paper

Laser speckle contrast analysis (LASCA) for flow measurement
Author(s): J. David Briers; Glenn J. Richards
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Paper Abstract

Laser light, when scattered from a moving object or fluid, fluctuates in intensity. These fluctuations can yield information about the velocity of the scatterers involved. Most techniques analyze the temporal fluctuations of a single speckle. For information on the spatial distribution of velocities, some form of scanning is necessary. Exceptions include speckle photography and particle image velocimetry, which are full-field, double-exposure methods for measuring lateral velocities and flow. Another full- field technique, laser speckle contrast analyses, has the additional advantages of being a relatively cheap, single- exposure technique operating in quasi-real time and sensitive to both lateral and line-of-sight motion. LASCA was originally developed to monitor blood flow, but these advantages should also be useful in industrial flow measurement.

Paper Details

Date Published: 17 September 1997
PDF: 11 pages
Proc. SPIE 3098, Optical Inspection and Micromeasurements II, (17 September 1997); doi: 10.1117/12.281163
Show Author Affiliations
J. David Briers, Kingston Univ. (United Kingdom)
Glenn J. Richards, Kingston Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 3098:
Optical Inspection and Micromeasurements II
Christophe Gorecki, Editor(s)

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