Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1991-12-18
1993-06-15
Rosenberger, Richard A.
Optics: measuring and testing
By polarized light examination
With light attenuation
250221, G01B 1114
Patent
active
052204090
ABSTRACT:
Light beam detection is taught in method and apparatus where a light source of coherent light is directed toward a reflecting hologram made to simulate a parabolic mirror to generate light beams detected by photoreceptors along one side of an opto-frame, such receptors being scanned in a manner to preclude false detection of an object within the field of light. An an alternative, multiple light sources are used with a single receptor and an appropriate hologram.
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AMP Incorporated
Ness Anton P.
Pitts Robert W.
Rosenberger Richard A.
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