NASA NTRS · 19880000320
Synchronous Photodiode-Signal Sampler
Abstract
Synchronous 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.
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Primus, Howard K.. 1988-06-01. Synchronous Photodiode-Signal Sampler. https://ntrs.nasa.gov/citations/19880000320
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