Short range optical rangefinder

Details Short range optical rangefinder Short range optical rangefinder

1982-10-18

1985-12-03

Buczinski, S. C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

102213, 356 4, G01C 310, G01C 308, F42C 1302

Patent

active

045563136

ABSTRACT:
An optical rangefinder having a transmitter and receiver located closely acent for short range operation allows optimum detection of a target when either or both the target and the rangefinder are moving. An optical window region is established where the transmitter look axis intersects the receiver look axis and is adjustable for providing an output signal when the rangefinder and target are less than approximately ten feet apart. The transmitter may emit either noncoherent or coherent infrared energy. The receiver includes zero crossing detection when a received maximum signal intensity is reached and adequate signal detection means which activates when the signal level exceeds a desired minimum. An output signal is generated when the outputs of these two detection circuits are coincident.

REFERENCES:
patent: 2297534 (1942-09-01), Brulin
patent: 2350820 (1944-06-01), Rettinger
patent: 2379496 (1945-07-01), Saunier, Jr.
patent: 2489297 (1949-10-01), Labin et al.
patent: 3493769 (1970-02-01), Revesz et al.
patent: 3512888 (1970-05-01), Humphrey
patent: 3892483 (1975-07-01), Saufferer
patent: 4010689 (1977-03-01), Sochard et al.
patent: 4068222 (1978-01-01), Treviranus
patent: 4409900 (1983-10-01), Currie

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