## Abstract

Simultaneous temperature and strain measurement with a distributed Brillouin loss system is proposed by use of the parameters Brillouin frequency, power, and bandwidth, for PANDA, bow-tie, and tiger polarization-maintaining fibers for the first time to our knowledge. The expressions for simultaneous temperature and strain sensing and the maximum errors and rms values of temperature and strain measurements are derived with three combinations of the parameters: (1) power and Brillouin frequency, (2) bandwidth and Brillouin frequency, and (3) bandwidth and Brillouin power. Our experiments demonstrate that simultaneous temperature and strain sensing at 20-cm spatial resolution for Brillouin frequency combined with bandwidth the strain/temperature resolutions are $39\mathit{\mu}\epsilon /2{}^{\xb0}\mathrm{C}$ (PANDA), $126\mathit{\mu}\epsilon /3{}^{\xb0}\mathrm{C}$ (bow tie), and $598\mathit{\mu}\epsilon /16{}^{\xb0}\mathrm{C}$ (tiger); for the Brillouin frequency combined with power the strain/temperature resolutions are $153\mathit{\mu}\epsilon /8{}^{\xb0}\mathrm{C}$ (PANDA) and $237\mathit{\mu}\epsilon /4{}^{\xb0}\mathrm{C}$ (bow tie); and for the bandwidth combined with power the strain/temperature resolutions are $135\mathit{\mu}\epsilon /38{}^{\xb0}\mathrm{C}$ (PANDA) and $195\mathit{\mu}\epsilon /38{}^{\xb0}\mathrm{C}$ (bow tie).

© 2004 Optical Society of America

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