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Brillouin scattering has been widely investigated as a basis for fiber distributed temperature and strain measurements. Measurement of a single parameter (Brillouin frequency or power), however, is unable to discriminate the two measurands, temperature and strain. The Brillouin optical time-domain reflectometry technique was thus developed, in which both a Brillouin frequency shift and a change in power are used to produce temperature and strain changes simultaneously along a length of fiber.