Patent ID: 8342743

Claim:
A method for testing a rotor blade of a wind, power installation, which covers a rotor blade coverage area during operation of the wind power installation, having the following steps: (a) transmission of an aiming light beam, in particular of an aiming light beam which has an aiming light beam power density, in an aiming light beam direction at the rotor blade coverage area, (b) detection of any reflection of the aiming light, beam on an impact point on the rotor blade by a detection apparatus, (c) directly after the detection of the reflection, electrically controlled transmission of a measurement later beam with a measurement laser beam power density which is greater than the aiming light beam power density, at the impact point, such that the rotor blade is heated at the impact point, (d) measurement of a temperature distribution at the impact point, and (e) repetition of steps (a) to (d) for a plurality of impact points.