Fiber laser sensor system using long-term fiber grating

摘要

A fiber laser (resonator) which uses a fiber Bragg grating at the same time as a wavelength selective reflector and a sensor head and a simple structure using an optical fiber grating of a long period as an optical filter to measure a change of Bragg wavelength varying with a physical quantity applied to the Bragg grating By providing an optical fiber Bragg grating sensor composed of a Bragg wavelength converter, the size of the sensor output and the signal-to-noise ratio can be increased. In addition, by using the long period grating as the optical filter of the wavelength converter, it is possible to construct the entire sensor system in the form of optical fiber, thereby increasing the stability, efficiency and economical efficiency of the system. By adjusting the long period grating interval, The wavelength region can be freely selected.