Fiber optic proximity sensors for narrow targets with reflectivi

Details Fiber optic proximity sensors for narrow targets with reflectivi Fiber optic proximity sensors for narrow targets with reflectivi

1986-01-29

1987-10-20

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231R, G01D 534, G01J 516, G01J 4014

Patent

active

047016108

ABSTRACT:
An optical proximity detector including a set of transmitter fibers for directing light to a target and two sets of receiver fibers. One set of receiver fibers is combined with the transmitter fibers to from a central portion which is flanked by the second set of receiver fibers. Two light sensors and a signal processing circuit are also included to generate one output signal which is linear with respect to the distance to the target and is independent of the target reflectance. The detector is especially suited for monitoring targets having widths less than the diameter of the bundle, such as a turbine blade.

REFERENCES:
patent: 3503116 (1970-03-01), Strack
patent: 3814081 (1974-06-01), Mori
patent: 4070116 (1978-01-01), Frosch et al.
patent: 4141624 (1979-02-01), Siegmund
patent: 4601537 (1986-07-01), Saccocio

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