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

With the capability of Brillouin optical correlation domain analysis (BOCDA) technique to probe measurands with millimeter order spatial resolution, the idea of combining intensity measurements with BOCDA for high spatial resolution temperature compensated distributed strain sensing has been explored and successfully demonstrated. This paper discusses the advantages of achieving this temperature compensation using Raman or Brillouin intensity measurements. Combining BOCDA with measurement of the backscattered Brillouin anti Stokes signal provides improved high spatial resolution temperature corrected distributed strain.