Apparatus and method for angle measurement

G - Physics – 01 – B

Patent

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G01B 11/26 (2006.01)

Patent

CA 2047288

Apparatus is disclosed which includes two side-by-side planar light sensors. A light stop is spaced from one light sensor in position to stop or shade half of the light sensor surface from a projected light beam when the beam is orthogonal thereto. The other light sensor is completely exposed to the projected light beam. The one light sensor is exposed to more or less of the light beam dependent upon the beam's departure in one direction or the other from orthogonality to the plane of the one light sensor. A ratio of the output from the one light sensor to the output from the other provides beam angle information relative to the plane of the one light sensor.

Cette invention concerne un dispositif comportant deux photodétecteurs juxtaposés. Un écran est placé à une distance telle de l'un des photodétecteurs que la moitié de la surface dudit détecteur ne puisse être éclairée par un faisceau lumineux qui lui est orthogonal, l'autre photodétecteur étant entièrement exposé au faisceau lumineux. Le premier photodétecteur est plus ou moins exposé au faisceau à mesure que celui-ci dévie dans un sens ou l'autre de l'orthogonalité. Le rapport du signal de sortie du premier photodétecteur au signal de sortie de second renseigne sur l'orientation angulaire du faisceau par rapport au plan dudit premier photodétecteur.

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