The electromagnetic environment of the factory and the surrounding air contains substances such as heavy metals, compounds, and fuel vapors, which are not conducive to the work of conventional electric sensors and instruments. Due to the unique electrical insulation that gives the optical fiber sensor the ability to resist electromagnetic interference (EMI), and the intrinsic safety in flammable and explosive situations, as well as the fast response and resistance to corrosive liquids, the optical fiber sensor is suitable for the working environment of the factory. Especially in the petrochemical industry, which belongs to the flammable and explosive field, fiber grating sensors are very suitable for applications in the petrochemical field because of their intrinsic safety.
Because fiber Bragg grating sensors have the advantages of anti-electromagnetic interference and corrosion resistance, they can replace traditional electric sensors and be widely used in offshore oil platforms and oilfields and coalfields to detect reserves and formation conditions. The fiber grating sensor built into the thin steel pipe can be used as an optical cable for pipe or pipe temperature and elongation measurement of offshore drilling platform. The FBG sensing system can implement distributed real-time online monitoring of long-distance oil and gas pipelines. Spirin designed an FBG sensor for oil spill monitoring. They encapsulated FBG in polymer butyl synthetic rubber. This polymer has good oil expansion characteristics. When the pipeline or oil storage tank leaks, the sensor is soaked in petroleum, and the polymer expands and stretches the fiber grating to make the grating The center wavelength drifts, and the alarm purpose is achieved by monitoring this drift. At room temperature, the wavelength drift of the system is greater than 2 nm within 20 minutes, which greatly exceeds the wavelength drift (0.5 nm) that may be introduced by the temperature change of the ring mirror.