Laser speckle contrast analysis (LASCA) for flow measurement

J. David Briers; Glenn J. Richards

doi:10.1117/12.281163

17 September 1997 Laser speckle contrast analysis (LASCA) for flow measurement

J. David Briers, Glenn J. Richards

Proceedings Volume 3098, Optical Inspection and Micromeasurements II; (1997) https://doi.org/10.1117/12.281163
Event: Lasers and Optics in Manufacturing III, 1997, Munich, Germany

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.

Citation Download Citation

J. David Briers and Glenn J. Richards "Laser speckle contrast analysis (LASCA) for flow measurement", Proc. SPIE 3098, Optical Inspection and Micromeasurements II, (17 September 1997); https://doi.org/10.1117/12.281163

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