Strain and temperature discrimination using fiber bragg gratings in a cross-wire configuration
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United States of America Patent
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Feb 23, 2016
Grant Date -
Jul 12, 2012
app pub date -
Nov 4, 2010
filing date -
Sep 20, 2010
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Abstract
A fiber Bragg grating cross-wire sensor may be used to independently determine strain and temperature variation. An example fiber Bragg grating cross-wire sensor comprises a first fiber Bragg grating (FBG) that reflects a first percentage, R1, of light of a first wavelength, λ1, and a second FBG that reflects a second percentage, R2, of light of a second wavelength, λ2. The second FBG is positioned orthogonal to the first FBG, and λ1 is substantially equal to λ2, but R1 is different from R2. As the FBG cross-wire sensor experiences a strain and/or a temperature variation, the wavelengths of light reflected by the first FBG and the second FBG will shift from the first and second wavelength, λ1 and λ2, to first and second shifted wavelengths, λA and λT, respectively. Based on R1, R2, λ1, λA, and λT, the strain and/or the temperature variation may be independently determined.
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