Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1979-02-21
1981-05-26
McGraw, Vincent P.
Optics: measuring and testing
By polarized light examination
With light attenuation
250561, 250204, G01B 1114, G01N 2186
Patent
active
042695120
ABSTRACT:
An electro-optical position-monitoring system including a tracking detector whose position is interpretable to indicate the spatial location of a monitored object. In one embodiment, the detector includes a beam-splitting prism, and in the other includes two arrays of fiber-optic elements--both arrangements being designed to divide reflected, received light into two optical paths. Interposed in these paths are photodetectors which each produce an output signal directly indicative of the intensity of light received along the associated path. Circuitry which responds to such signals effects tracking movement of the prism (or the arrays) so as to equalize signals produced by the photodetectors. When equalization occurs, tracking stops, and the repositioned location of tracked parts is directly readable as an indication of the spatial location of the monitored object.
REFERENCES:
patent: 3589815 (1971-06-01), Hosterman
patent: 3806253 (1974-04-01), Denton
patent: 4037958 (1977-07-01), Schmidt et al.
patent: 4125314 (1978-11-01), Haskell et al.
Cranberg, Sensory Aid for the Blind, "Electronics", 3/46, pp. 116-119.
Bovernick Rodney
McGraw Vincent P.
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