Optical fiber bragg grating coating removal detection

Details Optical fiber bragg grating coating removal detection Optical fiber bragg grating coating removal detection

2005-04-26

2005-04-26

Ullah, Akm Enayet (Department: 2874)

Optical waveguides

Optical waveguide sensor

C385S037000

Reexamination Certificate

active

06885785

ABSTRACT:
An optical corrosion sensor employs an optical fiber Bragg grating20embedded within an optical fiber18. The grating20has a coating40made of a material, such as aluminum, which corrodes or can otherwise be removed. The coating40exerts forces46radially inward around and along the grating20so as to cause the wavelength bandwidth of the grating reflectivity profile to become broader and to be shifted relative to its uncoated condition. Also, the forces on the grating20are reduced when the coating corrodes, thereby causing the wavelength bandwidth and shift of the reflectivity profile of the grating to narrow and to return to its uncoated condition.

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