Open AccessNew Method of Temperature and Strain Decoupling Based on Directivity of Fiber Bragg Grating Sensing
Author(s) -
Xiao Huang,
Zhenkun Jin,
Qing Shen
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2101/1/012023
Subject(s) - fiber bragg grating , decoupling (probability) , materials science , wavelength , cantilever , temperature measurement , directivity , optics , strain (injury) , acoustics , optoelectronics , composite material , physics , telecommunications , computer science , engineering , medicine , quantum mechanics , control engineering , antenna (radio)
Fiber Bragg Grating (FBG) has been widely used in temperature and strain measurement. Its center wavelength drift is affected by both temperature and strain. The influence of temperature and strain on center wavelength should be decoupled when measuring. In this paper, the sensing characteristics of FBG which pasted at different angles were simulated and analyzed, and it was found that FBG sensing for strain has strong directivity. A dual FBG composite construction based on the directivity of FBG sensing was proposed. Two FBGs were at an Angle of 62°. One FBG was sensitive to both temperature and strain, and the other was only sensitive to temperature. The structure can realize the decoupling of temperature and strain, and it doesn’t depend on feature of cantilever beam. It was verified by experimental analysis that the decoupling result was good by utilizing the combined FBG structure, and decoupling was realized easily.