Single-ended distributed fiber temperature measurements using the novel technique of microwave (11 GHz) coherent detection of spontaneous Brillouin backscattered power are presented. Anti-Stokes power traces mere obtained for a sensing length of 27.4 km, believed to be the longest yet demonstrated for such spontaneous power measurements. The power dependence on temperature was measured as 0.36/spl plusmn/0.04%/K, and the rms temperature error was less than 3.5 K at the far end of the sensing fiber.
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Maughan et al. (2001) studied this question.
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