Optical fiber grating torque sensor structure used in underwater environment

The utility model relates to an optical fiber grating torque sensor structure used in an underwater environment. The sensor structure has a torque measurement shaft and a sealing cylinder. The torque measurement shaft is arranged in the sealing cylinder. Both ends extend out of the sealing cylinder, and are fixedly connected with both ends of the sealing cylinder through two metal circular plates in a sealing manner. Optical fiber grating torque strain sensors are distributed and arranged on the torque measurement shaft in an orthogonal symmetric manner, and are used to improve measurement sensitivity and eliminate temperature cross sensitivity. A watertight type optical fiber socket is arranged on the sealing cylinder. The optical fiber grating torque sensors and a measurement device carry out optical signal transmission through a watertight optical fiber plug. The optical fiber grating torque sensor structure provided by the utility model has the advantages of simple structure, convenient installation, electromagnetic interference resisting, high measurement precision and long service life, and effectively solves the problem of device torque parameter measurement in the underwater harsh high pressure and corrosion environment.