The invention relates to a method for evaluating the inflow on the rotor blades 108 of a wind turbine 100, wherein the pressure P on the rotor blades 108, in particular the pressure of the wall pressure, is at least at one measuring position. Detecting at least a portion of the spectrum,-determining at least two characteristic values P 1 , P 2 from the pressure spectrum,-a relationship of the at least two characteristic values P 1 , P 2 to each other Forming an indicator value (I), and-evaluating whether a critical inflow (24) is present based on said indicator value (I).
展开▼