Optics: measuring and testing – Angle measuring or angular axial alignment – Apex of angle at observing or detecting station
Patent
1980-01-18
1984-10-16
Buczinski, S. C.
Optics: measuring and testing
Angle measuring or angular axial alignment
Apex of angle at observing or detecting station
180169, 350358, 356 5, 356 28, 358201, G01B 1126, G01C 308, G01P 336
Patent
active
044771843
ABSTRACT:
An obstacle detection system for vehicles comprises a laser radar mounted on the front end of a vehicle and modulated by drive pulses of high rate. The laser pulses are deflected in two orthogonal directions by paired deflection signals fed from a deflection driver to paired acousto-optic light deflectors to digitally scan a space ahead of the running vehicle. The deflector driver supplies paired deflection information to arithmetic logic means. One deflection signal fed to one deflector has a rate much higher than the other and is synchronized therewith. When receiving a return pulse by a photo-detector, a video pulse of substantially constant level is reproduced by a sensitivity time control function. The distance between a target and the vehicle can be registered in a binary counter. Relevant distance information is supplied to the arithmetic logic means. The latter provides a decision of whether a possibility of collision exists and produces an alarm when the distance approaches a stopping distance. For two facing targets the arithmetic logic means calculates a spacing between them and provides decision that passing-through therebetween is impossible if the spacing is smaller than a predetermined width. For a target above the road the arithmetic logic means calculates its height and provides a decision that passing-through thereunder is impossible if that height is smaller than a predetermined height.
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Buczinski S. C.
Nissan Motor Company Limited
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