Remote monitoring of wind direction on overhead transmission lines based on Fiber Bragg Grating

A novel wind direction monitoring system for the overhead transmission lines based on Fiber Bragg Grating (FBG) sensing is proposed in this paper. Compared to the existing systems, this system has several unique advantages, such as free from power supply on site, excellent ability to avoid electromagnetic interference, immunity to temperature and long lifespan. Firstly, with horizontal FBG arrangement, light intensity loss of the anemoscope is reduced and the monitoring distance is significantly enlarged. Then, optimization model is proposed to solve the contradiction between wavelength shift ranges of FBG and startup wind speed. Lastly, an algorithm is proposed to obtain wind direction and to eliminate the temperature effect. Experiments were conducted in a wind tunnel to calibrate the sensor. The results indicate that the startup wind speed of the anemoscope is 1.488m/s, and the anemoscope works properly under different wind direction.