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CATEGORIES:Engineering Department Geotechnical Research Semin
 ars
SUMMARY:An enhanced data interpretation methodology for th
 e distributed fiber optic sensing technology - Yin
 g Mei\, University of Cambridge\, Department of En
 gineering
DTSTART;TZID=Europe/London:20150604T160000
DTEND;TZID=Europe/London:20150604T164500
UID:TALK59201AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/59201
DESCRIPTION:When light is launched into a fibre optic cable\, 
 the majority of the light travels through the cabl
 e\, but a small fraction is backscattered and the 
 property of Brillouin backscattered light is relat
 ed to cable’s strain and temperature condition. Ba
 sed on that principle\, a Brillouin Optical Time D
 omain Reflectometry (BOTDR) analyser was construct
 ed and has been recently applied to many infrastru
 ctures for strain and temperature monitoring. Howe
 ver\, unexpected strain fluctuations were observed
  from a majority of site’s BOTDR measurement resul
 ts and it is hardly to distinguish whether the flu
 ctuation is error or real strain. Therefore a temp
 erature and strain calibration bench was establish
 ed in lab to characterize BOTDR analyser measureme
 nts and a fundamental optics model was built to si
 mulate the results. It is found out that BOTDR str
 ain measurement fluctuations are mainly coming fro
 m analyser spatial limitation\, and the faster str
 ain changes\, the more fluctuation there will be. 
 Based on that theory\, an enhanced data interpreta
 tion methodology is being investigated to minimise
  BOTDR measurement error and achieve better strain
  monitoring.
LOCATION: Cambridge University Engineering Department\, Lec
 ture Room 5
CONTACT:Anama Lowday
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