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Synchronous Photodiode-Signal SamplerSynchronous sampling circuit increases signal-to-noise ratio of measurements of chopped signal of known phase and frequency in presence of low-frequency or dc background noise. Used with linear array of photoelectric sensors for locating edge of metal plate. Multiplexing circuit cycles through 16 light-emitting-diode/photodiode pairs, under computer control. Synchronized with multiplexer so edge detector makes one background-subtracted signal measurement per emitter/detector pair in turn.
Document ID
19880000320
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Primus, Howard K.
(Caltech)
Date Acquired
August 13, 2013
Publication Date
June 1, 1988
Publication Information
Publication: NASA Tech Briefs
Volume: 12
Issue: 6
ISSN: 0145-319X
Subject Category
Electronic Components And Circuits
Report/Patent Number
NPO-16698
Accession Number
88B10320
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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