EFPI FBG hybrid sensor for simultaneous measurement of high temperature and larg

We report an extrinsic Fabry–Perot interferometer-fiber Bragg grating (EFPI-FBG) hybrid sensor in this letter. The interferometric cavity of the proposed hybrid sensor is composed of a glass capillary tube, a section of single-mode fiber, and a section of single-mode metal fiber with one FBG. The FB