Sensor assembly for measuring at least a first torsion of a rotor blade of a wind turbine generator system

A sensor assembly for measuring at least a first torsion of a rotor blade of a wind turbine generator system, the sensor assembly comprising:

• a first light source configured to generate light;
• a first transmitter-side polarizer disposed downstream of the first light source in a direction of light propagation and configured to generate linearly polarized light as a first transmission light;
• a second light source configured to generate unpolarized light as a second transmission light;
• a first detector element and a second detector element arranged and adapted to receive the first transmission light and the second transmission light;
• a first receiver-side polarizer disposed upstream of the first detector element in the direction of light propagation and a second receiver-side polarizer disposed upstream of the second detector element in the direction of light propagation, an orientation of a polarization plane of the first receiver-side polarizer and an orientation of a polarization plane of the second receiver-side polarizer being different from one another;
• and
• a transmitter unit disposed at a first position and a plurality of transmitter/receiver units disposed along a bending line of the rotor blade at second through nth positions, wherein the transmitter unit includes the first light source, the first transmitter-side polarizer, and the second light source, wherein a first transmitter/receiver unit of the transmitter/receiver units includes the first and second detector elements and the first and second receiver-side polarizers, wherein the first transmitter/receiver unit includes a third light source configured to generate light and a second transmitter-side polarizer disposed downstream of the third light source in the direction of light propagation, wherein the third light source and the second transmitter-side polarizer are configured to generate linearly polarized light as a third transmission light, and wherein the first transmitter/receiver unit includes a fourth light source configured to generate unpolarized light as a fourth transmission light.

A sensor assembly for measuring at least a first torsion of a rotor blade of a wind turbine generator system, the sensor assembly comprising:

• a first light source configured to generate light;
• a first transmitter-side polarizer disposed downstream of the first light source in a direction of light propagation and configured to generate linearly polarized light as a first transmission light;
• a second light source configured to generate unpolarized light as a second transmission light;
• a first detector element and a second detector element arranged and adapted to receive the first transmission light and the second transmission light;
• and
• a first receiver-side polarizer disposed upstream of the first detector element in the direction of light propagation and a second receiver-side polarizer disposed upstream of the second detector element in the direction of light propagation, an orientation of a polarization plane of the first receiver-side polarizer and an orientation of a polarization plane of the second receiver-side polarizer being different from one another,
• wherein the first light source and the first transmitter-side polarizer are configured to generate the linearly polarized light as the first transmission light in such a way that a polarization direction of the linearly polarized light is parallel or perpendicular to a second direction, the second direction being defined by a predetermined curvature of the rotor blade.