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  • CLEO/Europe and EQEC 2011 Conference Digest
  • OSA Technical Digest (CD) (Optica Publishing Group, 2011),
  • paper CH_P2

Performance comparison between Raman and Brillouin intensity based sub metre spatial resolution temperature compensated distributed strain sensor

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Abstract

With the capability of Brillouin Optical Correlation Domain Analysis (BOCDA) technique to probe measurands with millimeter order spatial resolution [1], the idea of combining intensity measurements with BOCDA for high spatial resolution temperature compensated distributed strain sensing has been explored and successfully demonstrated [2, 3]. This paper discusses the advantages of achieving this temperature compensation using Raman [2] or Brillouin intensity measurements [3]. Fig. 1 shows a summary of temperature compensation strain measurements made using Raman/Brillouin intensity in combination with Brillouin frequency based BOCDA. The 131m long sensing fibre comprised a 42m unheated-unstrained section, 14.5m of unstrained section maintained at 52°C, 33m unheated-unstrained section, 3.5m unheated section subject to 1044με over a fibre strain rig and 38m unheated-unstrained section of standard single mode telecommunications fibre.

© 2011 Optical Society of America

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