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Dynamic studies on a distributed temperature sensor with a 22-km sensing length

This paper presents the results of studies on a distributed temperature sensor (DTS) based on Brillouin gain and loss. The relationship between Brillouin gain/loss and input laser power and the effect of temperature non-uniformities on the system have been studied experimentally and theoretically. Finally we describe results from a combined distributed temperature and strain sensor based on the Brillouin loss mechanism.