Lees, G.P., de Souza, K. and Newson, T.P.
Novel optical fibre distributed temperature sensor based on the Landau-Placzek ratio
At Conference on Lasers and Electro-Optics (CLEO '97), United States.
18 - 23 May 1997.
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We report a compact, portable optical fiber distributed temperature sensor based on spontaneous Brillouin backscattered light. The ratio of the Rayleigh and Brillouin backscattered light is known as the Landau-Placzek ratio and gives a measure of temperature. To measure the Landau-Placzek ratio the Rayleigh and Brillouin signals that are separated by a frequency of approximately 10 GHz have to be spectrally resolved. A narrow linewidth Q-switched fiber laser and an inexpensive low loss in-fiber Mach-Zehnder interferometer were developed for this purpose.
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