NASA NTRS · 19770000274
Differential optical proximity detector
Abstract
Updated detector can operate under ambient light and uses multiple detectors to locate objects in several different spacial volumes. Sensitivity is approved by scanning field-of-view twice: once with coherent light source turned on and once with background light only. Detector outputs for two cases are amplified and subtracted for each photodiode sensor in array, to eliminate effect of background light.
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Johnston, A. R., Shimada, K., Tippins, H. H., Jr.. 1977-11-01. Differential optical proximity detector. https://ntrs.nasa.gov/citations/19770000274
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