Patent ID: 8261599

Claim:
A method of determining balancing of a rotor of a wind turbine, the wind turbine comprising a tower and a nacelle mounted to the top of the tower, the rotor being rotatably connected to the nacelle for rotating about a rotor axis and having a plurality of equally spaced blades, the method comprising: positioning a camera below the rotor; rotating the rotor so that a first blade is in a reference position in which a tip of the blade is directed toward the camera; capturing an image of the first blade in the reference position; rotating the rotor so that a second blade is in the reference position; capturing an image of the second blade in the reference position; determining a blade angle of the first blade from the image of the first blade in the reference position, wherein the blade angle is the angle between the rotor plane and a predetermined chord line of the blade designed as a reference point; determining the blade angle of the second blade from the image of the second blade in the reference position; and determining whether the blade angle of the first and second blades are within a predetermined threshold.