Abstract: Holographic techniques for measuring particles have been studied since the inception of holography. However, techniques used in the past have had limited success in particle velocimetry for one of the following reasons: large depth of focus, poor signal to noise ratio, distortion, and directional ambiguity in the particle displacement. This paper introduces holographic velocimetry, and discusses methods being investigated for implementing holographic particle image velocimetry (HPIV). !11
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