Patent ID: 8139206
Filing Date: 2012-03-20
Classification: F03D,F05B,G01P,Y02E

Abstract:
1. A method for determining a wind-speed of a wind acting on a blade of a wind-turbine, comprising: sending an optical-signal with a known frequency from an optical transmit-unit to a joint measurement volume; scattering the sent optical-signal and reflecting the sent optical-signal by atmospheric particles of the joint measurement volume; shifting the known frequency of the sent optical signal due to a Doppler-principle; receiving the frequency-shifted optical signal by an optical receive-unit; comparing the frequency-shifted optical-signal with the sent optical-signal; determining the wind-speed based on the shifted frequency caused by the atmospheric particles moving with the wind; combining the wind-speed with a factor for determining a three-dimensional wind-vector; and adjusting a setting of the wind-turbine according to the three-dimensional wind-vector.