Abstract
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.
Similar content being viewed by others
References
Bernal, L. P.; Scherer, J. 1990: Holographic particle image velocimetry. 43rd annual meeting of the Division of Fluid Dynamics of Amer. Phy. Soc., Cornell University, Ithaca, New York, 18–20 November
Blais, F.; Rioux, M. 1986a: BIRIS: a simple 3D sensor. SPIE Proceedings on Optics, Illumination, and Image Sensing for Machine Vision 728, 235–242, 30–31 October, Cambridge, MA
Blais, F.; Rioux, M. 1986b: Compact three-dimensional camera for robotic applications. J. Opt. Soc. Am. A 3, 1518–1521
Elkins, R. E.; Jackman, G. R.; Johnson, R. R.; Lindgren, E. R.; Yoo, J. K. 1977: Evaluation of stereoscopic trace particle records of turbulent flow fields. Rev. Sci. Instrum. 48, 738–746
Moraitis, C. S.; Riethmuller, M. L. 1990: Real time optical processing of holographically recorded particle images for 3-D whole field velocimetry. Proc. of the 5th Int. Symposium on Application of Laser Techniques to Fluid Mechanics. Lisbon: Instituto Superior Tecnico, LADOAN, Portugal, 9–12 July
Papantoniou, D.; Maas, H.-G 1990: Recent acvances in 3-D particle tracking velocimetry. Proc. of the 5th Int. Symposium on Application of Laser Techniques to Fluid Mechanics. Lisbon: Instituto Superior Tecnico, LADOAN, Portugal, 9–12 July
Racca, R. G.; Dewey, J. M. 1988: A method for automatic particle tracking in a three-dimensional flow field. Exp. Fluids 6, 25–32
Stanislas, M.; Rodriguez, O.; Dadi, M.; Beluche, F. 1986: Application of high speed holography to aerodynamic and hydrodynamic three-dimensional velocimetry. AGARD-CP-413, Aerodynamic and related hydrodynamic studies using water facilities, Monterey, USA, 20–23 October
Weinstein, L. M.; Beeler, G. B. 1986: Flow measurements in a water tunnel using a holocinematographic velocimeter. AGARD-CP-413, Aerodynamic and related hydrodynamic studies using water facilities, Monterey, USA, 20–23 October
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Willert, C.E., Gharib, M. Three-dimensional particle imaging with a single camera. Experiments in Fluids 12, 353–358 (1992). https://doi.org/10.1007/BF00193880
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00193880