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Record Details

Record 8 of 4161
Chopping-Wheel Optical Attenuator
Author and Affiliation:
Leviton, Douglas B.(NASA Goddard Space Flight Center, Greenbelt, MD.)
Abstract: Star-shaped rotating chopping wheel provides adjustable time-averaged attenuation of narrow beam of light without changing length of optical path or spectral distribution of light. Duty cycle or attenuation factor of chopped beam controlled by adjusting radius at which beam intersects wheel. Attenuation factor independent of wavelength. Useful in systems in which chopping frequency above frequency-response limits of photodetectors receiving chopped light. Used in systems using synchronous detection with lock-in amplifiers.
Publication Date: Dec 01, 1988
Document ID:
(Acquired Nov 04, 1995)
Accession Number: 88B10574
Report/Patent Number: GSC-13139
Document Type: NASA Tech Brief
Publication Information: NASA Tech Briefs; p. P. 42; (ISSN 0145-319X); 12; 11
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
Availability Source: National Technology Transfer Center (NTTC), Wheeling, WV
Availability Notes: No additional information available: For specific technical questions contact TU Officer at Center of origin.
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