Abstract: We develop strain, tilt and acceleration sensors with strain accuracy of 5 με, tilt angle precision of 0.02°, and acceleration sensitivity of 800 pm/g below 40 Hz, based on the principle of fiber Bragg grating (FBG).We further employed them to establish a safety monitoring system for the jacket structure of offshore platform. We implement online monitoring for pileleg supporting force, platform tilt and swing amplitude. We also calculate its strain situation by constructing a mechanical model for jacket structure, analyze the security of the jacket structure and conduct alert.The system has been successfully applied in an oil platform at South China Sea, and provide security guarantee for the jacket structure.

Key words: offshore platform, structure monitoring, fiber optic sensing