3 December 1980 Noncoherent-Light Speckle Photography For Measurements Of Fluid Velocity Fields
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Abstract
Noncoherent light speckle photography utilizes the idea that a mass of fluid carrying particles or a solid surface which is illuminated obliquely will exhibit a unique pattern of spots or speckles. These speckles are recorded for two states of the specimen using high-resolution photography and, for dynamic problems, strobe lighting. A map of displacement during the interval for the specimen is extracted from the photograph using optical data processing. Experiments on a solid calibration specimen demonstrate the quantitative capability of the method. Preliminary flow experiments have used water loaded with aluminum or other particles. Qualitatively meaningful fringe patterns have been obtained for laminar and turbulent flow in a channel.
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Gary Cloud, Gary Cloud, Robert Falco, Robert Falco, Russell Radke, Russell Radke, Jeffery Peiffer, Jeffery Peiffer, } "Noncoherent-Light Speckle Photography For Measurements Of Fluid Velocity Fields", Proc. SPIE 0243, Applications of Speckle Phenomena, (3 December 1980); doi: 10.1117/12.959297; https://doi.org/10.1117/12.959297
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