The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 24, 2007
Filed:
May. 24, 2005
Alan D. Kersey, South Glastonbury, CT (US);
Martin A. Putnam, Cheshire, CT (US);
Mark R. Fernald, Enfield, CT (US);
Robert N. Brucato, Cheshire, CT (US);
James S. Sirkis, Wallingford, CT (US);
Alan D. Kersey, South Glastonbury, CT (US);
Martin A. Putnam, Cheshire, CT (US);
Mark R. Fernald, Enfield, CT (US);
Robert N. Brucato, Cheshire, CT (US);
James S. Sirkis, Wallingford, CT (US);
Weatherford/Lamb, Inc., Houston, TX (US);
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.