Abstract
A simple heterodyne speckle interferometer can be built by slightly modifying a classical laser Doppler velocimeter (LDV) for fluid flows applications. The random character of the speckle scattered by a rough surface is considered for the statistical description of the measured signals as a function of the number of speckle grains collected by the photodetector. Three types of simple demodulators are proposed and demonstrated. In particular, it is shown that the LDV frequency counters can be used without any change to process the continuous frequency modulated signals obtained in a speckle interferometer.
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