Simultaneous temperature and strain measurement with combined spontaneous Raman and Brillouin scattering

Opt Lett. 2005 Jun 1;30(11):1276-8. doi: 10.1364/ol.30.001276.

Abstract

We report on a novel method for simultaneous distributed measurement of temperature and strain based on spatially resolving both spontaneous Raman and Brillouin backscattered anti-Stokes signals. The magnitude of the intensity of the anti-Stokes Raman signal permits the determination of the temperature. The Brillouin frequency shift is dependent on both the temperature and the strain of the fiber; once the temperature has been determined from the Raman signal, the strain can then be computed from the frequency measurement of the Brillouin signal.