Fluid diffusion resistant glass-encased fiber optic sensor
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United States of America Patent
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Sep 30, 2003
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N/A
app pub date -
Jan 31, 2000
filing date -
Jan 31, 2000
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Abstract
A fluid diffusion resistant tube-encased fiber grating pressure sensor includes an optical fiber 10 having a Bragg grating 12 impressed therein which is encased within a sensing element, such as a glass capillary shell 20. A fluid blocking coating 30 is 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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