A wind turbine optical wind sensor

摘要

The invention comprises a wind turbine having an optical wind sensor 10. The optical wind sensor generates one or more multiple beams of light 42 each of which forms a sensor beam pointing along a sensor axis. Where more than one sensor beam is used the beams are arranged so that the different sensor axes lie at least partly orthogonal to each other allowing the wind direction 40 to be detected for any direction of wind. Each multiple sensor beam comprises at least two individual sensor beams having different respective wavelengths of light. The different colour of the individual light beams allows the sensor system to detect which of the light beams is triggered first when matter in the wind passes through the beam and reflects light back to light collecting device.