Abstract
In this paper, we demonstrate the measurements of lateral loads in a
distributed manner using long-length fiber Bragg gratings (FBGs) based on
optical frequency-domain reflectometry (OFDR). Birefringence is induced at
specific areas of the long-length FBGs by lateral compression. The distributions
of the Bragg peaks were monitored by the OFDR sensing system, from which we
calculated the applied lateral loads. Theoretical calculation results confirmed
the validity of the experimental results. In addition, position-wise beat
signals of the power of the obtained spectra were observed with smaller lateral
loads that were not sufficient to provide two distinguished Bragg peaks. This
unique phenomenon for the frequency-domain reflectometry scheme is explained
theoretically. We proposed a method for utilizing the beat cycle to calculate
smaller lateral loads.
© 2012 IEEE
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