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Proceedings Paper

Measurement of structure motion by means of a moving light sheet
Author(s): Ping Tcheng; Thomas L. Jordan; John M. Franke; Kenneth Cate
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Paper Abstract

The elaboration of an optical system which measures the displacement and velocity of large flexible space structures is reviewed. The motion-measuring system, comprised of a laser, optics, motorized mirror, two photodiodes and electronics, is designed to allow feedback for configuration control of flexible structures. A motor or scanner is employed to sweep the light sheet. The range of motion was shown to be 2 inches, and information was received at a rate of 30 Hz. The uncertainty in displacement measurement was better than +0.01 inch from a distance of 16 feet. The results are considered to be very good for two scanning light sheet systems. Higher sample rates and a more constant speed would improve the rotating mirror option, and the accuracy and range of the scanning mirror option could be upgraded as well. Both setups are shown to be viable noncontact measuring methods for the displacement and velocity of large space structures.

Paper Details

Date Published: 1 October 1990
PDF: 12 pages
Proc. SPIE 1303, Advances in Optical Structure Systems, (1 October 1990); doi: 10.1117/12.21505
Show Author Affiliations
Ping Tcheng, NASA/Langley Research Ctr. (United States)
Thomas L. Jordan, NASA/Langley Research Ctr. (United States)
John M. Franke, NASA/Langley Research Ctr. (United States)
Kenneth Cate, NASA/Langley Research Ctr. (United States)


Published in SPIE Proceedings Vol. 1303:
Advances in Optical Structure Systems
John A. Breakwell; Victor L. Genberg; Gary C. Krumweide, Editor(s)

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