Optical waveguides – Optical waveguide sensor
Reexamination Certificate
2006-12-26
2006-12-26
Wood, Kevin S. (Department: 2874)
Optical waveguides
Optical waveguide sensor
C385S037000, C385S013000, C385S125000
Reexamination Certificate
active
07155074
ABSTRACT:
A pressure transducer has a cane waveguide geometry with “side-holes” in the cane waveguide cross-section that reduce the force required to compress the waveguide. The cane waveguide is a large diameter optical waveguide with a cross-section of at least about 0.3 millimeters, at least one inner core, a Bragg grating arranged therein, a cladding surrounding the inner core, and a structural configuration for providing a reduced bulk modulus of compressibility and maintaining the anti-buckling strength of the waveguide. The structural configuration reduces the cross-sectional area of the waveguide. These side holes reduce the amount of glass that needs to be compressed, but retains the large diameter. The waveguide responds to an optical signal, further responds to an external pressure that causes a differential strain across the inner core, for providing a Bragg grating optical-signal containing information about a birefringence of the Bragg grating that is proportional to the external pressure.
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Patterson & Sheridan LLP
Weatherford / Lamb, Inc.
Wood Kevin S.
LandOfFree
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