Abstract
We present a theoretical and experimental analysis of the sensing
capabilities of Raman-based distributed temperature optical fiber sensor
(RDTS) systems using only the anti-Stokes (AS) component in loop
configuration. In particular, the effects of time- and wavelength-dependent
losses on the sensor performance are thoroughly investigated under different
experimental conditions. As expected from the developed theory, experimental
results demonstrate that using the loop AS-light only approach in RDTS
systems can correct the impact of local and wavelength-dependent losses on
the final temperature measurements, with the simple use of an internal
calibration fiber spool at a known temperature value. Signal-to-noise ratio
and temperature resolution analyses of the AS-only RDTS point out an
improved temperature resolution in comparison to standard RDTS systems in
loop configuration.
© 2011 IEEE
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