Measuring and testing – Fluid pressure gauge – Diaphragm
Reexamination Certificate
2006-05-23
2006-05-23
Lefkowitz, Edward (Department: 2855)
Measuring and testing
Fluid pressure gauge
Diaphragm
Reexamination Certificate
active
07047816
ABSTRACT:
A pressure transducer that uses a rhomboidal flexure to provide displacement amplification to an optical sensing element is disclosed. The transducer includes an optical sensor disposed between sides of the flexure. The top portion of the flexure connects to a displacement device, such as a bellows. A first pressure port provides a first pressure to the bellows. A second pressure, preferably greater than the first pressure, is ported into a housing containing the flexure, which tends to compress the bellows and pull apart or expand the flexure. Such expansion pinches or compresses the optical sensing element between the sides of the flexure, and in particular stresses an optical sensing element containing a fiber Bragg grating. Assessing the Bragg reflection wavelength of the grating allows the differential pressure to be determined, although the transducer can also be used to sense an absolute pressure. A temperature compensation scheme, including the use of additional fiber Bragg gratings and thermal compensators axially positioned to counteract thermal effects of the optical sensing element, is also disclosed.
REFERENCES:
patent: 4932263 (1990-06-01), Wlodarczyk
patent: 5348019 (1994-09-01), Sluss, Jr. et al.
patent: 5569856 (1996-10-01), Jacobs-Cook
patent: 5844667 (1998-12-01), Maron
patent: 6175108 (2001-01-01), Jones et al.
patent: 6229827 (2001-05-01), Fernald et al.
patent: 6278811 (2001-08-01), Hay et al.
patent: 6422084 (2002-07-01), Fernald et al.
patent: 6439055 (2002-08-01), Maron et al.
patent: 6490931 (2002-12-01), Fernald et al.
patent: 6519388 (2003-02-01), Fernald et al.
patent: 6626043 (2003-09-01), Bailey et al.
patent: 6668656 (2003-12-01), Fernald et al.
patent: WO 00/70320 (2000-11-01), None
patent: WO 02/103315 (2002-12-01), None
U.K. Search Report, Application No. GB0406263.4, dated Aug. 11, 2004.
Dunphy James R
Jones Richard T
Allen Andre
Lefkowitz Edward
Patterson & Sheridan L.L.P.
Weatherford / Lamb, Inc.
LandOfFree
Optical differential pressure transducer utilizing a bellows... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical differential pressure transducer utilizing a bellows..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical differential pressure transducer utilizing a bellows... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3625465