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:
Nov. 02, 2004
Filed:
Jul. 12, 2002
Mark R. Fernald, Enfield, CT (US);
Timothy J. Bailey, Longmeadow, MA (US);
Matthew B. Miller, Glastonbury, CT (US);
James M. Sullivan, Manchester, CT (US);
Richard T. Jones, Hamden, CT (US);
Christopher J. Wright, Amston, CT (US);
Alan D. Kersey, Glastonbury, CT (US);
Martin A. Putnam, Cheshire, CT (US);
Robert N. Brucato, Waterbury, CT (US);
Paul E. Sanders, Madison, CT (US);
Weatherford/Lamb, Inc., Houston, TX (US);
Abstract
A pressure-isolated Bragg grating temperature sensor includes an optical element, which includes an optical fiber having at least one Bragg grating disposed therein. The Bragg grating is encased within and fused to at least a portion of an inner glass capillary tube, or comprises a large diameter waveguide grating having a core and a wide cladding and having the grating disposed therein, encased within an outer tube to form a chamber. An extended portion of the sensing element that has the grating therein extends inwardly into the chamber, which allows the grating to sense temperature changes but isolates the grating from external pressure. More than one grating or pair of gratings may be used and more than one fiber or optical core may be used. At least a portion of the sensing element may be doped between a pair of gratings to form a temperature tuned laser, or the grating or gratings may be configured as a tunable DFB laser disposed in the sensing element.