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Proceedings Paper

Stereoscopic system for measuring particle trajectories past an underwater model
Author(s): H.-T. Liu; Michael A. Weissman; Gary B. White; G. E. Miner; William T. Gustafson
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Paper Abstract

A stereoscopic system was developed that integrates hardware and software components for image acquisition, digitization, processing, display, and measurements. The model-induced trajectories of nearly neutrally buoyant fluorescent particles, illuminated with a 15-W pulsed copper vapor laser, are tracked in a towing tank by stereoscopic time-lapse photography using two 35-mm cameras positioned at a 90-degree angle from the top and the side. A C program, HI, drives two data I/O boards hosted in a PC to set up the run parameters, control the operations of the laser and camera shutters, and acquire the stereo images. The photographic records are digitized and processed to derive the centroids of reference marks and particle images. The centroids are then fed into a Windows-based program, Track/3D, to perform image correlation, correction for image distortion, stereo conversion, stereoscopic display, and measurements. The display module incorporates a graphics library that drives a stereoscopic display adapter attached to a monitor; the stereogram must be viewed with polarizing glasses. Functions are available for image translation, rotation, zooming, and on- screen measurements. The velocity and acceleration components of the 3-D flow field induced by the model are derived from the trajectories, serving as a basis for whole-field stereoscopic quantitative flow visualization.

Paper Details

Date Published: 15 April 1994
PDF: 11 pages
Proc. SPIE 2177, Stereoscopic Displays and Virtual Reality Systems, (15 April 1994); doi: 10.1117/12.173880
Show Author Affiliations
H.-T. Liu, Quest Integrated, Inc. (United States)
Michael A. Weissman, Quest Integrated, Inc. (United States)
Gary B. White, Quest Integrated, Inc. (United States)
G. E. Miner, Quest Integrated, Inc. (United States)
William T. Gustafson, Quest Integrated, Inc. (United States)

Published in SPIE Proceedings Vol. 2177:
Stereoscopic Displays and Virtual Reality Systems
Scott S. Fisher; John O. Merritt; Mark T. Bolas, Editor(s)

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