Distance measuring apparatus with phase detection

Details Distance measuring apparatus with phase detection Distance measuring apparatus with phase detection

1991-01-22

1993-01-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356 5, G01N 2186, G01C 308

Patent

active

051809222

ABSTRACT:
A distance measuring apparatus has a photoelectric light transmitter (11) and a photoelectric light receiver (12) which alternately direct light via a measurement path (14) and a reference path (15) to a single photoreceiver (20). The distance from a target (13) is determined by measurement of the transit time differences via the measurement path (14), on the one hand, and via the reference path (15), on the other hand. The light transmitter (11) contains two laser diodes (18, 19) which can be electronically switched in a complementary manner of which the one sends the light trains to the measurement path (14) and the other sends light trains to the reference path (15). Both light wave trains are alternately received by the same photoreceiver (20) which is connected to an electronic processing circuit.

REFERENCES:
patent: 3326078 (1967-06-01), Clarke et al.
patent: 4403857 (1983-09-01), Holscher
patent: 4531833 (1985-07-01), Ohtomo
patent: 4895441 (1990-01-01), Allen, Jr.
patent: 5054911 (1991-10-01), Ohishi et al.

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