Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1975-09-24
1977-05-31
Wilbur, Maynard R.
Optics: measuring and testing
Range or remote distance finding
With photodetection
180 98, 340 1T, 340 33, 340 38P, 340 38S, 343 5PD, 343 6ND, 343112CA, 356 28, G01C 308, G01S 966
Patent
active
040266540
ABSTRACT:
A system for detecting the distance L between two objects A and B, either or both of which may be in motion, comprising approach detector means and proximity detector means operational within overlapping distance ranges; each detector means includes an emitter mounted on a first one of the objects, which radiates a primary signal toward the second object, a responder on the second object, which radiates a similar secondary signal back toward the first object, and a signal comparator for measuring the time differential between the primary and secondary signals to determine the distance L between the objects. A range switch coupled to both comparators develops an output indicative of the distance L within a comprehensive distance range encompassing both the approach range and the proximity range and extending down to zero distance.
REFERENCES:
patent: 3600090 (1971-08-01), Wood et al.
patent: 3604805 (1971-09-01), Scott
patent: 3760414 (1973-09-01), Nicolson
patent: 3892483 (1975-07-01), Saufferer
Buczinski S. C.
Engins Matra
Wilbur Maynard R.
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