1. College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China
2. National Institute of Metrology, Beijing 100029, China
3. College of Precision Instrument and Optoelectronic Engineering, Tianjin University, Tianjin 300072, China
4. GD Power Development Company, Beijing 600795, China
Abstract A strain calibration test method and device of equal strength cantilever FBG sensor based on deflection analysis are introduced.The simulation analysis method of related parameters in the strain transfer process of FBG sensor is studied.The relevant parameters in the strain transfer process are accurately measured, and the surface strain and deflection of equal strength cantilever beam under different loads are theoretically analyzed and simulated.At the same time, the relationship between deflection and beam surface strain and FBG sensor strain is analyzed, the strain sensitivity of FBG sensor after calibration is given, and the uncertainty of the calibration result of FBG sensor measured by deflection method is evaluated. When the inclusion factor k=2, the relative extended uncertainty of strain sensitivity of FBG sensor is less than 0.5%, which can meet the requirements of high-precision strain test, and provides technique support for strain calibration of high-precision FBG sensor.
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2021, Vol. 42 
