NASA NTRS · 19770000041
Optical proximity detector
Abstract
Sensitive, relatively inexpensive instrument uses phase-detection techniques to sense presence of objects. Phase-sensitive detectors, LED, photodiode with response matched to LED output, and filtering lens allow detector to operate over narrow radiation band, giving selectivity over stray light.
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Hermann, W. A., Johnston, A. R.. 1977-06-01. Optical proximity detector. https://ntrs.nasa.gov/citations/19770000041
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