Dynamic photogrammetry utilizing high-speed digital imaging

J. C. Kent; W.-C. Choi; Y. G. Guezennec

doi:10.1117/12.273342

28 May 1997 Dynamic photogrammetry utilizing high-speed digital imaging

J. C. Kent, W.-C. Choi, Y. G. Guezennec

Proceedings Volume 2869, 22nd International Congress on High-Speed Photography and Photonics; (1997) https://doi.org/10.1117/12.273342
Event: 22nd International Congress on High-Speed Photography and Photonics, 1996, Santa Fe, NM, United States

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.

Citation Download Citation

J. C. Kent, W.-C. Choi, and Y. G. Guezennec "Dynamic photogrammetry utilizing high-speed digital imaging", Proc. SPIE 2869, 22nd International Congress on High-Speed Photography and Photonics, (28 May 1997); https://doi.org/10.1117/12.273342

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