Optical Fiber, Apparatus to Sense Bending and Strain Having the Same, Method to Sense Bending and Strain thereof

摘要

The optical fiber according to an embodiment of the present invention, the oval-shaped core (core); And surrounding the core, are formed on both sides of the core having a pair of air holes that have a two unique cut-off wavelength according to the two polarization states of light (air hole) the case where the light enters the cladding (cladding); comprises, when the bending core and the cladding (bending) or strain (strain) is applied, the bending force applied to the core and cladding by measuring the degree of decrease of the transmission power which is caused by the movement of the short wavelength cut-off wavelength (bending) or may measure a strain (strain). According to an embodiment of the invention, the temperature without being affected by the external factors and the like, and can accurately measure the bending (bending) or strain (strain) is applied to the optical fiber, and physical, such as the outside of the electromagnetic interference and the error not affected by the perturbation can be prevented from being damaged buildings and even built. ;