We present the preliminary results of a digital holographic system
that can determine the two-dimensional velocity vector fields in several
slices of a sample volume. A CCD camera directly records the diffraction
patterns of small particles illuminated by a double-pulse laser diode. In
fact, the diffraction can be interpreted as a convolution with a wavelet
family of functions. The scale parameter a is related to the distance z
between a particle and the CCD camera. Then, the intensity distributions in a
plane located at a distance z are reconstructed by computing the wavelet
components for the corresponding scale parameter a. Afterwards, a particle
image velocimetry algorithm is applied to the numerically reconstructed pair
of images. The feasibility of this technique is demonstrated for two simulated
displacements.
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