Research on Straint/Emperature/Vibration Sensing Model Based on FBG

To further master the sensing theory and characteristics of fiber grating and understand the law of light wave transmission in fiber grating is conducive to the research of fiber grating sensing technology. The optical waveguide theory is derived from the electromagnetic waveguide theory, which refers to the transmission theory of light waves in optical fibers. In recent decades, it has been rapidly developed, while gradually improving, and constantly promoting the further development of optical fiber sensing technology. Because FBG has a core whose refractive index changes periodically along the axis, it can be analyzed by optical waveguide theory. It is a kind of irregular optical waveguide, and its transmission characteristics can be analyzed by coupling mode theory, and then its sensing principle can be analyzed. Based on the vector mode coupling theory of informal optical waveguide, the FBG strain sensing model, FBG temperature sensing model and FBG vibration sensing model are analyzed and studied in this paper.