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Synchronizing Photography For High-Speed-Engine ResearchLight flashes when shaft reaches predetermined angle. Synchronization system facilitates visualization of flow in high-speed internal-combustion engines. Designed for cinematography and holographic interferometry, system synchronizes camera and light source with predetermined rotational angle of engine shaft. 10-bit resolution of absolute optical shaft encoder adapted, and 2 to tenth power combinations of 10-bit binary data computed to corresponding angle values. Pre-computed angle values programmed into EPROM's (erasable programmable read-only memories) to use as angle lookup table. Resolves shaft angle to within 0.35 degree at rotational speeds up to 73,240 revolutions per minute.
Document ID
19890000436
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Chun, K. S.
(NASA Lewis Research Center, Cleveland, OH.)
Date Acquired
August 14, 2013
Publication Date
September 1, 1989
Publication Information
Publication: NASA Tech Briefs
Volume: 13
Issue: 9
ISSN: 0145-319X
Subject Category
Electronic Systems
Report/Patent Number
LEW-14713
Accession Number
89B10436
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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