System for detecting position of gauge pointer

摘要: A system is disclosed for detecting the position of pointer a gauge. The includes stationary light source which positioned adjacent pointer. lens receives from and redirects in at least one elongated beam directed toward In preferred embodiment, located along pointer's axis rotation bends rays 90° to form arcuate beam. plurality beams can be used variations different shapes readily by so designing means. sensitive detector positionable gauge itself movable guided path on opposite side than source. generally follows particular shape that needle. function sense, provide some signal when passes across sensor, thereby substantially reducing amount sensor. this manner signals sensor may moved within limits an infinite number positions conveniently knobs outside operator thus can, simply turning knob, adjust desired will detect or remains position.