Wind turbine blade provided with optical wind velocity measurement system

摘要

A wind turbine includes a number of blades and an optical measurement system comprising a light source, such as a laser, an optical transmitter part, an optical receiver part, and a signal processor. The light source is optically coupled to the optical transmitter part, which includes an emission point for emitting light in a probing direction. The optical receiver part comprises a receiving point and a detector. The optical receiver part is adapted for receiving a reflected part of light from a probing region along the probing direction and directing the reflected part of light to the detector to generate a signal used to determine a first velocity component of the inflow. The emission point is located in a first blade at a first radial distance from a center axis, and the receiving point is located in the first blade at a second radial distance from the center axis.

主权项

1. A wind turbine comprising a number of blades including at least a first wind turbine blade extending substantially radially from a hub on a main shaft having a substantially horizontal centre axis, the blades together with the hub constituting a rotor with a rotor plane, and which can be put into rotation by wind, and each blade having an innermost part having a root section of the blade and an outermost part having a tip section of the blade, wherein the wind turbine has an optical measurement system comprising a laser as a light source, an optical transmitter part, an optical receiver part, and a signal processor, wherein
the light source is optically coupled to the optical transmitter part, the optical transmitter part comprises an emission point and is adapted for emitting light in a probing direction from said emission point, the optical receiver part comprises a receiving point and a detector, wherein the optical receiver part is adapted for receiving a reflected part of light from a probing region along the probing direction at the receiving point and directing said reflected part of light to the detector so as to generate a signal from the detector based on the received, reflected light, and the signal processor is adapted to determine at least a first velocity component of the inflow from the signal generated by the optical receiver part, wherein the emission point of the optical transmitter part is located in the first blade at a first radial distance from the centre axis, and the receiving point of the optical transmitter part is located in the first blade at a second radial distance from the centre axis, wherein the optical measurement system is adapted to emit at least a first probing beam and a second probing beam, the first and second probing beams being arranged to emit light in separate divergent directions to probe wind velocities in at least two different probing volumes.