Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2006-02-07
2006-02-07
Porta, David (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S559290
Reexamination Certificate
active
06995352
ABSTRACT:
An apparatus and method for determining the position of a hydraulically actuated sliding sleeve valve in real time is disclosed. The apparatus comprises, in a preferred embodiment, a reference sensor and a position sensor, both of which constitute fiber optic windings wound around the hydraulic fluid cavity used to activate the sleeve. The sensors measure the pressure exerted by the hydraulic fluid in the cavity, with the reference sensor circumferentially lengthening to create an optical time delay indicative of the base line pressure of the hydraulic fluid. As the sleeve moves, the position sensor becomes increasingly exposed to the hydraulic fluid pressure and also begins to experience a time delay, which can be compared to the reference sensor's time delay to determine sleeve position.
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U.K. Search Report, Application No. GB 0400486.7, dated Mar. 24, 2004.
Hay Arthur D.
Ogle Peter
Robinson Robert
Patterson & Sheridan L.L.P.
Porta David
Sohn Seung C.
Weatherford / Lamb, Inc.
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