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. 09, 2004
Filed:
Dec. 28, 2001
Ian Bennion, Northampton, GB;
John Williams, Solihull, GB;
Christopher Groves-Kirkby, Northampton, GB;
Lin Zhang, Birmingham, GB;
Bookham Technology, PLC., Abingdon, GB;
Abstract
A strain sensor comprises an optical waveguide having a plurality of reflecting structure (Bragg grating) along its length. Each structure reflects light at a different characteristic wavelength (&lgr; to &lgr; ) which changes in dependence on a change of physical length of at least part of the reflecting structure. The reflectivity of reflecting structures which reflect at characteristic wavelengths which are adjacent to each other (&lgr; and &lgr; or &lgr; and &lgr; ) are configured to be different such that the intensity of light reflected from adjacent structures can be used to discriminate between them.