JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI ›› 2010, Vol. 27 ›› Issue (9): 25-28.

• HEALTHY CHANGJIANG RIVER • Previous Articles     Next Articles

Application of FBG Temperature Sensors in Water Temperature Monitoring for Three Gorges Dam

DUAN Hang 1, REN Da-chun 1 ,WANG Zong-kui 2 , DUAN Tao 3   

  1. 1.Yangtze River Scientific Research Institute Research Center of Water  Engineering Safety and Disease Control Engineering of Ministry of Water Resources, Wuhan 430010,China ; 2.Wuhan Surveying  geotechnical Research Institute of China Metallurgical Science and Industry group CO.LED.  Wuhan 430080, China ; 3. College of Port Waterway and Offshore Engineering,  Hohai University, Nanjing 210024, China
  • Online:2010-09-01 Published:2012-08-22

Abstract: The wavelength variation of Fiber Bragg Grating (FBG) is affected by the effective refraction ratio and fiber Bragg grating period . From measuring the change of reflected wavelength of FBG, we can ascertain the change of environment. We suppose that with pressure field and the axial stress field being kept constant, then a temperature sensing model is set up, and in combination with demand of measuring the water temperature in front of the Three Gorges Dam , we suggest using the quadratic relationship of temperature and wavelength. The calibration results can meet the requirements, and the monitoring results are good.

Key words: Fiber Bragg grating ,  temperature sensor ,   calibration ,  monitoring

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