Research on Temperature Response of FBG Sensor Surface-packaged on High Strength Steel Wire
In order to solve the temperature correction problem of surface-packaged high-strength wire fiber grating strain sensor(HSW-FBG sensor)for bridge cables,the temperature response layered structure model of HSW-FBG sensor was established and its temperature sensitivity coefficient calculation formula was derived.9 HSW-FBG sensors were designed and manufactured based on orthogonal test,and the temperature response of the sensors was verified and analyzed by water bath test.The results show that the temperature sensitivity coefficient of the FBG sensor changes greatly after packaging,and the accuracy of the calculation formula of the temperature sensitivity coefficient of the HSW-FBG sensor is verified by the water bath test.Through the analysis of influence parameters and range analysis,the order of influence of temperature sensitivity coefficient is the thermal stress coefficient of high-strength steel wire,the initial wavelength of optical fiber,the thermal stress coefficient of packaging material,and the cross-section area of packaging layer,among which the base material plays a decisive role in the temperature response of HSW-FBG sensor.The research results of temperature response of HSW-FBG sensors will lay a solid foundation for its engineering application.
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