Optical distance measurement apparatus and method using cleaning

Details Optical distance measurement apparatus and method using cleaning Optical distance measurement apparatus and method using cleaning

1994-12-29

1997-04-22

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

180169, 356 501, 356 51, 356 505, 356 506, B60T 716, G01C 308

Patent

active

056233345

ABSTRACT:
Optical distance measurement apparatus and method. The apparatus comprises a light emitting circuit, a light receiving circuit, a trigger signal generation circuit, a pollution sensor, a diode abnormal state sensor, a control/time-distance conversion circuit, a cleaning device and a car collision prevention device. The pollution sensor receives a part of a light beam which is emitted from the light emitting circuit and then reflected from protecting glass mounted on a front side of the apparatus, to sense a variation in a reflectivity of the protecting glass, and discriminates a polluted state of the protecting glass in accordance with the sensed result. The diode abnormal state sensor receives the part of the light beam which is emitted from the light emitting circuit and then reflected from the protecting glass, to sense an abnormal state of a light emitting laser diode in the light emitting circuit, and emits a light beam to the light receiving circuit through the protecting glass to sense an abnormal state of a light receiving photo diode in the light receiving circuit. The cleaning device removes pollution on a front surface of the protecting glass under control of the control/time-distance conversion circuit.

REFERENCES:
patent: 4274736 (1981-06-01), Balmer
patent: 4722599 (1988-02-01), Fruengel
patent: 5091726 (1992-02-01), Shyu
patent: 5122796 (1992-06-01), Beggs et al.
patent: 5160971 (1992-11-01), Koshizawa
patent: 5230400 (1993-07-01), Kakinami et al.
patent: 5357438 (1994-10-01), Davidian

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