Fiber bragg grating strain gauge

A fiber bragg grating strain gauge relates to the field of sensor elements and comprises an optical fiber, a substrate and a packaging tube, the optical fiber is embedded in the substrate through integral pouring, and the substrate is of a fully-sealed structure with the thickness of 0.15-2.00 mm; the inner diameter of the packaging tube is 0.12 to 1.8 mm; the packaging tube is tightly attached to the optical fiber through extrusion molding to package and seal the exposed end of the optical fiber, or the left part and the right part of the tail end of the packaging tube are symmetrically cut off, and the remaining upper part and the remaining lower part are bent to package and seal the exposed end of the optical fiber. Or a small iron wire transversely passes through the upper part of the optical fiber, so that the lower surface of the small iron wire is clamped on the upper surface of the optical fiber, and the exposed end of the optical fiber is packaged and sealed. The optical fiber and the substrate form