Font Size: a A A

Theoretical And Experimental Study Of Temperature And Strain Measurement Based Fiber Grating

Posted on:2011-07-17Degree:MasterType:Thesis
Country:ChinaCandidate:L P ZhangFull Text:PDF
GTID:2178360305987845Subject:Communication and Information System
Abstract/Summary:PDF Full Text Request
The research condition of fiber Bragg grating (FBG) sensing technology is reviewed, and the dependences of FBG center wavelength on temperature, strain and pressure are investigated theoretically in this thesis. A FBG based temperature and strain sensing system utilizing a tunable Fabry-Perot (F-P) filter is designed and set up. The smallest detectable temperature and strain of the sensing system is deduced by statistical optics method, and the simulation results show that the smallest detectable temperature and strain are 0.68℃and 5.83με, respectively. The principle that the reference FBG is used to eliminate the measurement error caused by the cavity length drift of tunable F-P filter is analyzed, and the peak-detection algorithm using Gaussian fitting is selected as the wavelength demodulation algorithm of the sensing system, then the corresponding wavelength demodulation software is designed and achieved by LabVIEW. Finally the performance of the sensing system is tested, which shows that the sensing system has good veracity, linearity and repeatability.
Keywords/Search Tags:fiber Bragg grating, temperature, strain, tunable Fabry-Perot filter, sensing system
PDF Full Text Request
Related items