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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 27,
  • Issue 9,
  • pp. 1142-1146
  • (2009)

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

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Abstract

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 0.01 $^{\circ} {\rm C} $ 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.

© 2009 IEEE

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