Strain sensing
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United States of America Patent
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-
Nov 9, 2004
Grant Date -
N/A
app pub date -
Dec 28, 2001
filing date -
Mar 19, 1999
priority date (Note) -
Expired
status (Latency Note)
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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 (.lambda..sub.1 to .lambda..sub.n+1) 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 (.lambda..sub.1 and .lambda..sub.2 or .lambda..sub.n and .lambda..sub.n+1) are configured to be different such that the intensity of light reflected from adjacent structures can be used to discriminate between them.
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