Abstract
Interpretation of Brillouin-scattering-based distributed strain and
temperature measurements so far has been based on the premise that the
Brillouin coefficients used to describe the influence of strain or
temperature remain constant under circumstances where a sensing fiber is
subjected to the combined influence of both temperature and strain. We
examine the validity of these assumptions by experimentally evaluating the
Brillouin coefficients under combined temperature and strain influence. In
order to illustrate the importance of correcting the Brillouin coefficients
for estimation of true values of applied strain and change in temperature,
arbitrarily chosen values of change in frequency and percentage change in
intensity are used to calculate the values of applied strain and change in
temperature by using both corrected and uncorrected Brillouin
coefficients.
© 2011 Crown
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