Optical waveguides – Optical waveguide sensor – Including physical deformation or movement of waveguide
Reexamination Certificate
2005-05-24
2005-05-24
Ullah, Akm Enayet (Department: 2874)
Optical waveguides
Optical waveguide sensor
Including physical deformation or movement of waveguide
C385S012000, C385S015000
Reexamination Certificate
active
06898338
ABSTRACT:
An optical sensing device including a force-applying assembly for providing a force and a Fabry-Perot (FP) element including a large-diameter waveguide having a core and having a cavity in line with the core, the cavity having reflective surfaces and having an optical path length related to the distance between the reflective surfaces, the FP element being coupled to the force so that the optical path length changes according to the force, the FP element for providing an output optical signal containing information about a parameter that relates to the force. Sometimes the large-diameter waveguide is formed by collapsing a glass tube, having a bore and having an outer diameter of about one millimeter, onto a pair of optical fibers arranged in tandem in the bore and separated by a predetermined distance, and respective end faces of the optical fibers form the cavity and are coated with a wholly or partially reflective material.
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Brucato Robert N.
Fernald Mark R.
Kersey Alan D.
Putnam Martin A.
Sirkis James S.
Moser, Patterson & Sheridan L.L.P.
Ullah Akm Enayet
Weatherford / Lamb, Inc.
Wood Kevin S.
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