Research on Fiber Bragg Grating Dual-parameter Sensing Technology

Abstract

The external environment where the FBG sensing system is located may have changes in strain and temperature, concentration and other physical quantities. Aiming at the dual-parameter monitoring of temperature and strain in the application of fiber Bragg grating (FBG) dual-parameter measurement, the dual-wavelength matrix operation method is adopted to analysis and study the problem theoretically. By using the dual wavelength matrix algorithm, the error analysis of the established FBG equation is carried out, and the relative error curves of temperature and strain under cross sensitivity are obtained. When the FBG sensing system is used for measurement, it is necessary to fully consider the impact of cross-sensitivity on measurement. When the temperature and strain gradually increase to a certain range, the error caused by the cross sensitive term will be greater. The application of FBG sensing system can be improved and enhanced by optimizing the dual-wavelength matrix operation method.