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Proceedings Paper

Recent experiences with implementing a video-based six-degree-of-freedom measurement system for airplane models in a 20-foot-diameter vertical spin tunnel
Author(s): Walter L. Snow; Brooks A. Childers; Stephen B. Jones; Charles M. Fremaux
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Paper Abstract

Recent progress in establishing calibration schemes for video cameras promises to significantly enhance the measurement capabilities available to aeronautical engineers studying flight dynamics. Targeting and lighting conditions in working facilities are usually less than ideal from a photogrammetric standpoint. This paper will discuss the implementation of a customized state-of-the-art commercial tracker used to estimate pitch attitude and spin rate of 10 Hz refresh rates for a free spinning model in a 20 foot diameter vertical wind tunnel. Active efforts to augment the measurement accuracy of the real time system by post processing concurrent, time coded, taped data from two independent camera stations will also be described. Independent calibration of interlaced fields, degradations due to storage media, effects of electronic shuttering, limited numbers of target points, estimation of 'optical flow' of data from field to field, vibration, and conflicting requirements for the competing video systems will be discussed.

Paper Details

Date Published: 24 February 1993
PDF: 23 pages
Proc. SPIE 1820, Videometrics, (24 February 1993); doi: 10.1117/12.141379
Show Author Affiliations
Walter L. Snow, NASA Langley Research Ctr. (United States)
Brooks A. Childers, NASA Langley Research Ctr. (United States)
Stephen B. Jones, NASA Langley Research Ctr. (United States)
Charles M. Fremaux, Lockheed Engineering and Sciences Co. (United States)

Published in SPIE Proceedings Vol. 1820:
Sabry F. El-Hakim, Editor(s)

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