Non-contact sensor, system and method with particular utility fo

Details Non-contact sensor, system and method with particular utility fo Non-contact sensor, system and method with particular utility fo

1981-10-29

1984-06-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356 1, 250235, 180169, G01N 2186

Patent

active

044568290

ABSTRACT:
Electro-optical apparatus, system and method for measuring distance to a relatively moving surface, such as distance to a road surface from a vehicle frame of reference passing thereover. The apparatus includes a light transmitter for projecting a rectangular beam vertically downwardly onto the road surface. A rotating scanner includes a circumferential array of facets for sequentially receiving the image diffusely reflected from the road surface and reflecting such image through a rectangular reticle onto a photodetector. Reference beams are sequentially reflected by the road image-reflecting scanner facets onto a reference detector. Distance to the road surface is then determined as a function of the angle of incidence of the road image onto the scanner by comparing the time of incidence of the road image to the times of occurrence of the reference reflections on the reference detector.

REFERENCES:
patent: 3856399 (1974-12-01), Hosoe et al.
patent: 3970845 (1976-07-01), Hollis et al.
patent: 4136949 (1979-01-01), Hayamizu et al.

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