Fiber optic position sensor

Details Fiber optic position sensor Fiber optic position sensor

1982-12-27

1985-10-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231SE, G01D 534

Patent

active

045476659

ABSTRACT:
A fiber optic sensor for determining the position of a shaft 10 that is supported by a bearing 12 includes a sensor circuit 14 and at least one fiber 16 that extends from the sensor circuit to a point proximate but slightly separated from the shaft surface, with a portion of the optical fiber extending through and being carried by the bearing. Target areas 18, 20 and 22 are located on shaft 10 so as to correspond to the positions to be determined. Each target area consists of an angled recess that is constructed and arranged, relative to the numerical aperture and orientation of the optical fiber, so as to substantially nonreflective insofar as the optical fiber is concerned, thus providing a sharp contrast to the highly reflective background of the shaft surface.

REFERENCES:
patent: 4275966 (1981-06-01), Kleesattel
patent: 4447118 (1984-05-01), Mulkey

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