Fiber bragg grating strain gauge and manufacturing method thereof

A fiber bragg grating strain gauge and a manufacturing method thereof relate to the field of sensor elements and manufacturing methods thereof, the fiber bragg grating strain gauge comprises an optical fiber, a substrate and a packaging tube, the optical fiber is embedded in the substrate through integral pouring, the substrate is of a fully-sealed structure, and the exposed end of the optical fiber is packaged and sealed through the packaging tube. The substrate is made of an epoxy resin-based composite material; and the packaging tube is made of a fusible polytetrafluoroethylene material. The manufacturing method comprises the following steps: S1, manufacturing a substrate mold; s2, packaging the exposed end of the optical fiber; and S3, pouring the substrate: integrally pouring the substrate material and the optical fiber on the prefabricated substrate mold. The optical fiber and the substrate are integrally cast and molded, so that the optical fiber and the substrate can form a whole, and the optical fibe