Fiber bragg grating torque sensor structure applicable to underwater environment

The invention relates to a fiber bragg grating torque sensor structure applicable to the underwater environment. The fiber bragg grating torque sensor structure is provided with a torque measuring shaft and a sealing (unsealing) cylinder, wherein the torque measuring shaft is disposed in the sealing cylinder with two ends extending out of the sealing cylinder, and the two ends of the torque measuring shaft are hermetically and fixedly connected with two ends of the sealing cylinder through two metal wafers, and fiber brag grating strain sensors are distributed and mounted on the torque measuring shaft and are orthogonally symmetric and used for improving measuring sensitivity and eliminating temperature cross sensitivity. A watertight fiber bragg socket is mounted on the sealing cylinder, and the fiber bragg torque sensors are in light signal transmission with a measuring device via the watertight fiber bragg socket. The fiber bragg grating torque sensor structure is simple in structure, convenient to mount, resistant to electromagnetic interference, high in measuring accuracy and long in service life, and the problem about measurement of device torque parameters in the underwater high-pressure and highly-corrosive environmental extremes is effectively solved.