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SUMMARY:An enhanced data interpretation methodology for the distributed fi
 ber optic sensing technology - Ying Mei\, University of Cambridge\, Depart
 ment of Engineering
DTSTART:20150604T150000Z
DTEND:20150604T154500Z
UID:TALK59201@talks.cam.ac.uk
CONTACT:Anama Lowday
DESCRIPTION:When light is launched into a fibre optic cable\, the majority
  of the light travels through the cable\, but a small fraction is backscat
 tered and the property of Brillouin backscattered light is related to cabl
 e’s strain and temperature condition. Based on that principle\, a Brillo
 uin Optical Time Domain Reflectometry (BOTDR) analyser was constructed and
  has been recently applied to many infrastructures for strain and temperat
 ure monitoring. However\, unexpected strain fluctuations were observed fro
 m a majority of site’s BOTDR measurement results and it is hardly to dis
 tinguish whether the fluctuation is error or real strain. Therefore a temp
 erature and strain calibration bench was established in lab to characteriz
 e BOTDR analyser measurements and a fundamental optics model was built to 
 simulate the results. It is found out that BOTDR strain measurement fluctu
 ations are mainly coming from analyser spatial limitation\, and the faster
  strain changes\, the more fluctuation there will be. Based on that theory
 \, an enhanced data interpretation methodology is being investigated to mi
 nimise BOTDR measurement error and achieve better strain monitoring.
LOCATION: Cambridge University Engineering Department\, Lecture Room 5
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