Within the next years more than 80% of the wind turbines in North America will be operating past the expiration of the manufacturer’s warranty. This means these turbines be maintained under a series of mainentence contracts. The companies responsible for the now aging fleet of wind turbines are wholly responsible for their performance and profitability. A physically small but critically important component on a wind turbine is its wind sensor. The wind sensor, or anemometer is installed atop the turbine’s nacelle and directs the controls to yaw the turbine into the wind for optimal performance.