Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1993-02-24
1994-07-19
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022721, H01J 516
Patent
active
053311523
ABSTRACT:
A sensor particularly for a valve actuator or choke for oil and gas production detects the position of an object that moves along a linear path. The sensor includes a holder with input and output fiber optic tubes extending into the holder. The ends of the fiber optic tubes locate adjacent the moving object. The moving object has a reflecting portion which will reflect light back when located in registry with the fiber optic tubes.
REFERENCES:
patent: 3729047 (1973-04-01), Bohlein
patent: 4304630 (1981-12-01), Tanner
patent: 4438987 (1984-03-01), Kapaan
patent: 4547665 (1985-10-01), Little et al.
ABB Vetco Gray Inc.
Bradley James E.
Nelms David C.
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