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).
Self-Modulated Laser Rangefinder
NASA Tech Briefs ; 7 , 4
1983-10-01
Miscellaneous
No indication
English
Electronically Scanned Laser Rangefinder
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