Method for testing a rotor blade of a wind power plant and test device

A test apparatus for wind power installations comprising:

• (a) an aiming light source which has an aiming light beam power density,
• (b) a detection apparatus, which is designed to detect any reflection of the aiming light beam at an impact point on a rotor blade of the wind power installation,
• (c) a measurement laser, which has a measurement laser power density which is greater than the aiming light beam power density, and is designed to output a measurement laser beam in a measurement laser beam direction,
• (d) a temperature measurement apparatus for measuring a temperature distribution at the impact point, and
• (e) an electrical controller, which is connected to the aiming light source, to the detection apparatus, to the measurement laser and to the temperature measurement apparatus.

A wind farm having at least two wind power installations, wherein a test apparatus is mounted on one of said at least two wind power installations, said test apparatus comprising:

• (a) an aiming light source which has an aiming light beam power density,
• (b) a detection apparatus, which is designed to detect any reflection of the aiming light beam at an impact point on a rotor blade of the wind power installation,
• (c) a measurement laser, which has a measurement laser power density which is greater than the aiming light beam power density, and is designed to output a measurement laser beam in a measurement laser beam direction,
• (d) a temperature measurement apparatus for measuring a temperature distribution at the impact point, and
• (e) an electrical controller, which is connected to the aiming light source, to the detection apparatus, to the measurement laser and to the temperature measurement apparatus,
• wherein said test apparatus carries out 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 on a rotor blade of another wind power installation of said at least two Wind power installations, which includes 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 laser 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.