Shaft encoder having a concave reflective element with two regio

Details Shaft encoder having a concave reflective element with two regio Shaft encoder having a concave reflective element with two regio

1984-09-25

1987-03-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250226, G01D 534

Patent

active

046527478

ABSTRACT:
An optical method of measuring displacement and a sensor for use in the method comprising a light guide and a concave reflective element positioned such that one end of the light guide is at the center of curvature of the reflective element. The reflective element has different regions having different reflection coefficients for light within two different wavelength bands. A member is interposed between the end and the reflective element, the member having light transmissive properties which vary spatially over the member in a direction transverse to the optical axis of the element. The member and reflective element are supported so as to allow them to be displaced relative to one another in a direction transverse to the optical axis of the element.

REFERENCES:
patent: 3399347 (1968-08-01), Martens
patent: 3455637 (1969-07-01), Howard
patent: 3983391 (1976-09-01), Clemons
patent: 4091280 (1978-05-01), Ellis et al.
patent: 4262198 (1981-04-01), Gupta et al.
patent: 4302109 (1981-11-01), Davies
patent: 4517456 (1985-05-01), Halsall et al.

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