Methods for producing ultrasonic sound emissions from wind turbines, active systems for emitting ultrasonic sounds from wind turbines 10, and wind turbines 10 are provided. In one embodiment, a method includes operating the wind turbine 10 with an ultrasonic sound emitting device 300 mounted on or within a component of the wind turbine, and receiving in a controller 404 at least one indicator. The method further includes determining if an operating condition exists based on the at least one indicator, and supplying a fluid flow through an outlet 310 of the ultrasonic sound emitting device 300 such that an ultrasonic sound emission is produced by the ultrasonic sound emitting device 300 if the operating condition exists.
