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Fiber-Optic Distributed Strain and Temperature Sensing With Very High Measurand Resolution Over Long Range Using Coherent OTDR

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4 Author(s)
Koyamada, Y. ; Dept. of Media & Telecommun. Eng., Ibaraki Univ., Hitachi ; Imahama, M. ; Kubota, K. ; Hogari, K.

We describe a novel fiber-optic technique for measuring distributed strain and temperature that uses a coherent optical time-domain reflectometer (OTDR) with a precisely frequency-controlled light source. Using this technique, we achieved temperature measurements in an 8-km-long fiber with a resolution of 0.01degC and a spatial resolution of one meter. This temperature resolution is two orders of magnitude better than that provided by the Brillouin based sensing technique.

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Lightwave Technology, Journal of  (Volume:27 ,  Issue: 9 )