Sensing system using optical fiber suited to high temperatures

Details Sensing system using optical fiber suited to high temperatures Sensing system using optical fiber suited to high temperatures

2011-01-04

2011-01-04

Peng, Charlie (Department: 2883)

Optical waveguides

Optical waveguide sensor

Reexamination Certificate

active

07865044

ABSTRACT:
Remote sensing in an environment having temperatures greater than 300° C., using an optical fiber having a core (10), a cladding (20), and a metallic protective coating (30) on the cladding to protect a surface of the cladding, the cladding having a diameter greater than 150 μm, and a thickness of at least 50 μm. The larger diameter cladding means stress from the metallic protective layer can be reduced, giving lower optical loss and better hydrogen protection. A metal conduit (330) encapsulates the sensing fiber, and a pump evacuates the conduit to reduce hydrogen seepage. Ceramic splice protectors are used. OTDR is used to determine differential loss at different locations along the fiber. A reflective element at the far-end of the fiber eases calibration.

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