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Three-dimensional particle imaging with a single camera of particles within parallel light sheet planes

Willert, C. E. and Gharib, M. (1992) Three-dimensional particle imaging with a single camera of particles within parallel light sheet planes. Experiments in Fluids, 12 (6). pp. 353-358. ISSN 0723-4864.

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A new approach to the instantaneous three-dimensional mapping of flow fields is introduced. A single camera system uses defocusing in conjunction with a mask (three pin holes) embedded in the camera lens to decode three-dimensional point sources of light (i.e., illuminated particles) on a single image. The sizes and locations of the particle image patterns on the image plane relate directly to the three-dimensional positions of the individual particles. Using sequential images, particles may be tracked in space and time, yielding whole-field velocity information. Calibration of the system is straightforward, whereas the self-similarity of the particle image patterns can be used in automating the data-extraction process. The described technique was used to obtain particle trajectories in the flow field of a vortex ring impinging on a wall.

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Additional Information:© 1992 Springer-Verlag. Received June 13, 1991. This communication was motivated through many inquiries on the subject after a presentation at the 43rd Annual APS/DFD Meeting in Ithaca, New York on the 23-24 November of 1990. We would like to thank many of our fellow researchers for their encouragements leading to publication of the presented material. Also special thanks to D. Liepmann for his participation on the free-surface mapping experiment. This research was made possible through the financial support from the Office of Naval Research/Fluid Dynamics Division (Contract number N00014-89-J-1529).
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Office of Naval Research (ONR) Fluid Dynamics DivisionN00014-89-J-1529
Issue or Number:6
Record Number:CaltechAUTHORS:20130913-145252660
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41329
Deposited By: Tony Diaz
Deposited On:16 Sep 2013 21:04
Last Modified:03 Oct 2019 05:48

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