NASA NTRS · 19830000142
Self-Modulated Laser Rangefinder
Abstract
Longitudinal resonance modes exploited. Self-modulated-laser ranging system exploits presence of signals differing in frequency by longitudinalmode separation frequency fm. Two square-law photodetectors have outputs modulated by fm, and phase difference between two outputs is related to target distance. Laser transmitter/receiver measures distances as well as displacements of distant objects (such as vibrating buildings).
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Abshire, J. B.. 1983-10-01. Self-Modulated Laser Rangefinder. https://ntrs.nasa.gov/citations/19830000142
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