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Chopping-Wheel Optical AttenuatorStar-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.
Document ID
19880000574
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Leviton, Douglas B.
(NASA Goddard Space Flight Center, Greenbelt, MD.)
Date Acquired
August 13, 2013
Publication Date
December 1, 1988
Publication Information
Publication: NASA Tech Briefs
Volume: 12
Issue: 11
ISSN: 0145-319X
Subject Category
Physical Sciences
Report/Patent Number
GSC-13139
Accession Number
88B10574
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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