Optical position sensor

Details Optical position sensor Optical position sensor

1981-12-21

1984-06-26

Punter, William H.

Optics: measuring and testing

By polarized light examination

With light attenuation

250237R, 356375, G01B 1114

Patent

active

044563787

ABSTRACT:
An optical sensor for sensing the radial position of a shaft. Detection of radial movement is made when a larger or smaller portion of a light beam incident on the shaft is blocked. In order to obtain a light beam of small diameter a laser light source or fiber optic system may be used. To provide long term stability the shaft is provided with a flat or with groove that is machined around its periphery to pass the entire light beam to a detector. This signal provides AGC compensation for the light source, detector and optical system.

REFERENCES:
patent: 3270507 (1966-09-01), Mercier et al.
patent: 3274880 (1966-09-01), Lillestrand et al.
patent: 3354319 (1967-11-01), Loewen et al.
patent: 3604940 (1971-09-01), Matthews
patent: 3908444 (1975-09-01), Peter
patent: 4097731 (1978-06-01), Krause et al.
patent: 4190767 (1980-02-01), Crouse
patent: 4224603 (1980-09-01), Lallemand

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