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.
© 2005 Optical Society of America
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(290.1350) Scattering : Backscattering
(290.5830) Scattering : Scattering, Brillouin
(290.5860) Scattering : Scattering, Raman
M. N. Alahbabi, Y. T. Cho, and T. P. Newson, "Simultaneous temperature and strain measurement with combined spontaneous Raman and Brillouin scattering," Opt. Lett. 30, 1276-1278 (2005)