A state monitoring device for at least one rotor blade of a wind turbine, having at least one flexible sensor device with a plurality of measuring sections, which are arranged on a plurality of sections of the rotor blade and are designed so as to measure at least one respective parameter, and a processing device for detecting and/or processing the measured parameters. The device also relates to a rotor blade for a wind turbine, having at least one such state monitoring device, and to a wind turbine, having such a state monitoring device or such a rotor blade.

An aerial vehicle obtains information regarding the external condition of a wind turbine. The wind turbine includes a tower, a nacelle rotatably supported by the tower, and a wireless charging device provided in the nacelle for charging the aerial vehicle. The aerial vehicle charged by the wireless charging device can stably acquire information regarding the appearance of the wind turbine without being limited in an available flight time.