Digital particle image accelerometry |
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Authors: | P Dong T-Y Hsu P Atsavapranee T Wei |
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Institution: | (1) Department of Mechanical and Aerospace Engineering Rutgers, The State University of New Jersey Piscataway, NJ 08854-8058, USA, US |
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Abstract: | A high-resolution video-based technique for obtaining two-dimensional fluid acceleration field data has been developed. The
algorithm uses a combination of cross-correlations and autocorrelations on doubly exposed images of particle-seeded flows.
Autocorrelations of individual video frames in an image pair yield two instantaneous velocity fields from which accelerations
can be computed. Cross-correlations between successive images in the pair are used to resolve directional ambiguity associated
with the autocorrelation. Time intervals are made arbitrarily small through the use of a laser sheet generator circuit which
is synchronized with the framing rate of the camera. The technique is validated using a fluid-filled Petri dish subject to
a known periodic motion. Ongoing development, uncertainties, and limitations of the technique are discussed.
Received: 22 October 1998/Accepted: 27 September 2000 |
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