US 12,031,886 B2
Sensor assembly for measuring at least a first torsion of a rotor blade of a wind turbine generator system
Markus Meissner, Uebersee (DE); Franz Langrieger, Trostberg (DE); Siegfried Reichhuber, Stein an der Traun (DE); and Stefan Gilg, Trostberg (DE)
Assigned to DR. JOHANNES HEIDENHAIN GMBH, Traunreut (DE)
Filed by DR. JOHANNES HEIDENHAIN GmbH, Traunreut (DE)
Filed on Dec. 7, 2022, as Appl. No. 18/076,434.
Claims priority of application No. 10 2021 213 938.8 (DE), filed on Dec. 8, 2021.
Prior Publication US 2023/0175917 A1, Jun. 8, 2023
Int. Cl. G01M 5/00 (2006.01); F03D 17/00 (2016.01); G01D 5/28 (2006.01)
CPC G01M 5/0058 (2013.01) [F03D 17/00 (2016.05); G01D 5/28 (2013.01); F05B 2260/83 (2013.01)] 20 Claims
OG exemplary drawing
 
1. 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 sensor assembly has first through third operating modes, the sensor assembly being configured to switch cyclically among the first through third operating modes.