Abstract
In this paper, fiber Bragg grating (FBG) sensors are used to monitoring the strain of steel and concrete structure. A designed novel steel slice is introduced to package the used FBG. A shallow rectangular groove is notched on the steel slice. Coated with a thin layer of epoxy, the FBG is fixed and protected on the groove. In order to eliminate to the temperature vibration effect on the wavelength shift of FBG sensors, a FBG temperature sensor is used for temperature compensation. The conventional electrical resistance strain gauges (ERS) are also used to measure the strain for the comparison with the FBG sensors to validate the effectiveness. The experimental shows that the novel FBG stain sensor designed by us can measure the stain of the steel and concrete structure effectively and the results from FBG strain sensor agree well with the results from the resistance strain gauge. The novel FBG strain sensor is simple, smart and fit to use in civil structure health monitoring.
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