Optical sensing device

Details Optical sensing device Optical sensing device

G - Physics

01

P

340/123.4, 340/1

G01P 13/00 (2006.01) B65H 7/14 (2006.01) G01P 3/36 (2006.01) G03B 27/62 (2006.01) G03G 15/00 (2006.01)

Patent

CA 1043441

OPTICAL SENSING DEVICE ABSTRACT OF THE DISCLOSURE An optical sensing device to minitor the flow of cut sheet material is disclosed. A light source and photo- detector are mounted on one side of the flow path and a concave reflector on the other side. In one embodiment, the reflector is spherical with its center of curvature midway between light source and photodetector. In another embodiment, the reflector is ellipsoidal having its foci at the light source and photodetector. In either case, the entire cone of light from the light source subtended by the reflector is directed to the photodetector. Material flowing in discrete units between the light source-photo- detector and the reflector alternately closes and opens optical communication in the device for purposes of control- lying some related function.

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