Optical Fiber External Environment Monitoring System Based On Brillouin Scattering

When the technology is not mature,the icing detection of transmission lines mainly depends on the on-site inspection of the staff,which is greatly affected by the factors such as terrain environment and personnel’s physical quality.After the snow disaster in 2008,the online monitoring technology of icing has attracted much attention.However,due to the immature relevant monitoring technology in China,the traditional monitoring device system has problems of power supply and reliability under the influence of strong magnetic field environment.In essence,the study of ice monitoring is the problem of the stress and temperature on the optical fiber.The optical fiber sensing technology can monitor the changes of the external environment of the optical fiber,among which the optical fiber sensing technology based on Brillouin scattering has a good advantage and application potential in ice monitoring.The optical fiber external environment monitoring system studied in this paper is a fully distributed optical fiber sensing technology based on Brillouin scattering.This technology is applied on the power transmission line,and has the functions of online monitoring of optical fiber icing position,real-time observation of icing situation and determination of icing position.According to this function,the optical fiber sensing system is built and the effect of temperature on the Brillouin frequency shift in the optical fiber is preliminarily studied.The feasibility of the system and the relationship between Brillouin frequency shift and temperature are verified,which lays the foundation for the stress monitoring and positioning in the next stage.The results of this study can be combined with the stress detection and location technology to realize the real-time monitoring of the ice-covered status of the cable and the precise location of the ice-covered dancing position.