Wide-range high-sensitivity fiber grating displacement sensor with two fixed ends

The invention relates to the field of fiber bragg grating sensors, and discloses a wide-range high-sensitivity two-end fixed fiber bragg grating displacement sensor which comprises a shell, a movable probe arranged at one end of the shell, a displacement transmission rod horizontally arranged in the center of the interior of the shell, one end of the displacement transmission rod fixed to the back face of the probe, and the other end of the displacement transmission rod. The other end is fixed on the inner wall of the shell through a transmission rod resetting device; the upper surface and the lower surface of the displacement transmission rod are each provided with a slope with the longitudinal section being a right triangle, and every two adjacent slopes are symmetrically arranged. Two groups of sensing units are arranged in the shell, each sensing unit comprises a probe, an optical fiber and a probe reset device, the probe is fixed on the inner wall of the shell through the probe reset device, the head of