Measuring and testing – Fluid pressure gauge – Photoelectric
Reexamination Certificate
2005-04-12
2005-04-12
Patel, Harshad (Department: 2855)
Measuring and testing
Fluid pressure gauge
Photoelectric
C250S227210
Reexamination Certificate
active
06877378
ABSTRACT:
A fluid diffusion resistant tube-encased fiber grating pressure sensor includes an optical fiber10having a Bragg grating12impressed therein which is encased within a sensing element, such as a glass capillary shell20. A fluid blocking coating30is disposed on the outside surface of the capillary shell to prevent the diffusion of fluids, such as water molecules from diffusing into the shell. The fluid diffusion resistant fiber optic sensor reduces errors caused by the diffusion of water into the shell when the sensor is exposed to harsh conditions.
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Bailey Timothy J.
Fernald Mark R.
Kersey Alan D.
MacDougall Trevor W.
Putnam Martin A.
Moser, Patterson & Sheridan L.L.P.
Patel Harshad
Weatherford / Lamb, Inc.
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