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Combined distributed temperature and strain sensor based on Brillouin loss in an optical fiber

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Abstract

We present a novel distributed sensor that utilizes the temperature and strain dependence of the frequency at which the Brillouin loss is maximized in the interaction between a cw laser and a pulsed laser. With a 22-km sensing length, a strain resolution of 20 μ and a temperature resolution of 2 °C have been achieved with a spatial resolution of 5 m.

© 1994 Optical Society of America

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