Abstract
Fiber grating sensors are widely used in the strain measurements for smart structures such as composite materials, bridges, aircraft, etc. In this paper, three successful approaches implemented to improve the accuracy for the fiber Bragg grating (FBG) strain sensing system are described and followed by experimental results. Firstly, two reference FBGs and a specific algorithm are used for the automatic calibration function. Secondly, the newly developed amplified spontaneous emission light source using Erbium-doped fiber was adopted to eliminate the wavelength reading error caused by the ripple. Thirdly, the pair sensors formed by two FBGs with different reflected wavelength were designed to simultaneously measure the temperature and strain of the structure. The strain reading variation of the sensing system is found to be 3.3 (mu) (epsilon) .
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