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Proceedings Paper

Dynamic photogrammetry utilizing high-speed digital imaging
Author(s): J. C. Kent; W.-C. Choi; Y. G. Guezennec
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Paper Abstract

Three-dimensional particle tracking velocimetry (3D PTV), a technique developed for measuring 3D fluid motion within a volumetric region, entails recording of a time sequence of stereo image-pairs of hundreds of small target-particles (flow-tracer particles) that are suspended in the fluid. The fluid motion is characterized by the 3D positions of the target particles as a function of time, information that is obtained by fully-automated processing of the stereo image sequences. Therefore, by extending the concept of photogrammetry to time varying scenes, 3D PTV can be described as transient or dynamic photogrammetry. Initially developed for measuring complex fluid motion, dynamic photogrammetry is ideally suited for a wide variety of 3D motion analysis applications. Digital imaging benefits dynamic photogrammetry by providing accurate spatial and temporal registration. As digital cameras with increasingly higher frame-rates become available, the dynamic range of the velocity measurements can be expanded, i.e., both higher and lower velocities can be measured for points of interest in the time-varying scene. This is illustrated by means of an analytical parameter study that makes use of computer- generated stereo images of target particles whose motion is prescribed to follow a 3D flow field typical of that which is generated in an engine cylinder during the intake stroke.

Paper Details

Date Published: 28 May 1997
PDF: 4 pages
Proc. SPIE 2869, 22nd International Congress on High-Speed Photography and Photonics, (28 May 1997); doi: 10.1117/12.273342
Show Author Affiliations
J. C. Kent, FloCoTec Inc. (United States)
W.-C. Choi, FloCoTec Inc. (United States)
Y. G. Guezennec, FloCoTec Inc. (United States)

Published in SPIE Proceedings Vol. 2869:
22nd International Congress on High-Speed Photography and Photonics
Dennis L. Paisley; ALan M. Frank, Editor(s)

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