Method and apparatus for determining the range of vision of a mo

Details Method and apparatus for determining the range of vision of a mo Method and apparatus for determining the range of vision of a mo

1991-02-22

1992-06-02

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 4, G01B 1130

Patent

active

051181800

ABSTRACT:
A method and apparatus are provided for determining the range of vision of the driver of an motor vehicle upon encountering a fog. A transmitter and receiving member is mounted on the front portion of the motor vehicle. A series of beam are transmitted from the range finder to different measured portions of the roadway. The reflections from the roadway are monitored. When the atmospheric conditions change so that a fog or other obstacle appears in the roadway, the reflected signal will take on different characteristics or will not appear at all. The driver of the motor vehicle can have a visual and/or an acoustic warning indication inside the vehicle to note that some dangerous condition exists.

REFERENCES:
patent: 4419731 (1983-12-01), Puffett
patent: 4781465 (1988-11-01), Demachi et al.
patent: 4786164 (1988-11-01), Kawata
patent: 4818887 (1989-04-01), Weishaupt et al.
patent: 4931767 (1990-06-01), Albreckt et al.

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