Abstract
In this paper digital speckle pattern interferometry (DSPI) as a digital image planeholography (DIPH) technique is presented and its potential for fluid velocimetry arediscussed. The recording is carried out with a spatial phase shifting (SPS) DSPI set-up,which can also be viewed as an off-axis DIPH set-up. A theoretical study of both SPS–DSPIanalysis using a Fourier transform method and DIPH analysis is presented for a set-up withonly one illuminated plane. From the DIPH analysis, a way to extend the SPS–DSPI set-upto simultaneously record but independently reconstruct several fluid planes is inferred.Some preliminary results from a convective flow illustrate the feasibility of the quasi 3Drecording.
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