Active distance measuring apparatus

Details Active distance measuring apparatus Active distance measuring apparatus

1991-10-03

1993-10-12

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 4, 356403, G01C 300

Patent

active

052530329

ABSTRACT:
An active distance measuring apparatus comprises a projector for projecting modulated light to an object, a photo-sensor for sensing the modulated light reflected by the object to produce a pair of alternating current signals in accordance with a distance to the object, and a signal processor for producing a distance signal in accordance with the pair of alternating current signals. The signal processor includes a detector means for detecting a voltage corresponding to each of the pair of alternating current signals a plurality of times and adding the results of such detection and repeating such detection and addition a plurality of times and a calculation for calculating the distance signal based on the output of the detector.

REFERENCES:
patent: 4758082 (1988-07-01), Kozuki et al.
patent: 4909624 (1990-03-01), Tsuru et al.
patent: 5008695 (1991-04-01), Nagaoka et al.

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