Abstract: The invention relates to the use of laser beams for measuring rotors, in particular wind turbines, for determining an imbalance or defining the absolute setting angle and/or measuring a half-profile of a rotor blade, and a method for determining a torsion of the rotor blade as a deviation between two pitch angles. The invention enables the determining of the absolute pitch angle of a rotor blade during operation, without it being necessary to obtain information relating to the rotor blade or reference points with a known position relative to the pitch axis, in particular using measuring devices that are mobile and/or positioned on the ground. It is also possible to contactlessly detect imbalances.

Abstract: The invention relates to the use of laser beams for measuring rotors, in particular wind turbines, for determining an imbalance or defining the absolute setting angle and/or measuring a half-profile of a rotor blade, and a method for determining a torsion of the rotor blade as a deviation between two pitch angles. In contrast to the solution in EP 2582970A1, the invention enables the determining of the absolute pitch angle of a rotor blade during operation, without it being necessary to obtain information relating to the rotor blade or reference points with a Known position relative to the pitch axis, in particular using measuring devices that are mobile and/or positioned on the ground. It is also possible to contactlessly detect imbalances.

Abstract: The invention relates to a method for measuring deflection of a substantially elongated hollow component (B) of a wind energy system from a normal position, extended such that it can be used to determine the deflection of the hollow component (B) of a of a wind energy system from a normal position in a simple and accurate manner, and to reliably monitor the same. To this end, the invention proposes that at least one distance sensor (8.1) for measuring distance in a non-contacting, directed manner is disposed at a first position, taking distance measurements from a target point in the direction of a second position within the hollow component (B), and that a measurement target (9.1) is further disposed in the interior of the hollow component (B) at the second position, said target comprising a target surface extending in a direction (x) transverse to a reference plane (R) perpendicular to the measurement direction (10) of the distance sensor (8.

Abstract: The invention relates to a device for monitoring a wind energy installation (1) comprising a tower (2) and a rotor provided with rotor blades (5) and arranged on the tower, in terms of a possible collision of a rotor blade (5) with the tower (2). Said device comprises at least one distance sensor (7a, 7b) which is arranged on the wind energy installation (1) and used for the non-contact measurement of the distance between the rotor blades (5) and a pre-determined point on the wind energy installation (1). The device also comprises an electronic evaluation system in which the distance data measured by the at least one distance sensor (7a, 7b) is evaluated, said system emitting a collision warning in the event of a critical distance not being reached.

Abstract: The invention relates to a method for measuring deflection of a substantially elongated hollow component (B) of a wind energy system from a normal position, extended such that it can be used to determine the deflection of the hollow component (B) of a of a wind energy system from a normal position in a simple and accurate manner, and to reliably monitor the same. To this end, the invention proposes that at least one distance sensor (8.1) for measuring distance in a non-contacting, directed manner is disposed at a first position, taking distance measurements from a target point in the direction of a second position within the hollow component (B), and that a measurement target (9.1) is further disposed in the interior of the hollow component (B) at the second position, said target comprising a target surface extending in a direction (x) transverse to a reference plane (R) perpendicular to the measurement direction (10) of the distance sensor (8.

Abstract: The invention relates to a device for monitoring a wind energy installation (1) comprising a tower (2) and a rotor provided with rotor blades (5) and arranged on the tower, in terms of a possible collision of a rotor blade (5) with the tower (2). Said device comprises at least one distance sensor (7a, 7b) which is arranged on the wind energy installation (1) and used for the non-contact measurement of the distance between the rotor blades (5) and a pre-determined point on the wind energy installation (1). The device also comprises an electronic evaluation system in which the distance data measured by the at least one distance sensor (7a, 7b) is evaluated, said system emitting a collision warning in the event of a critical distance not being reached.