Arrangement to measure the deflection of an object
AssigneeSiemens Aktiengesellschaft
InventorsJimmi Andersen, Per Egedal, Henrik Stiesdal, Andreas Ziroff
Life of this patent
Estimating the term…
Abstract
A reflector is arranged at a first position, which is assigned to a first end of the object. An antenna-system is arranged at a second position, which is assigned to a second end of the object. The antenna system contains a transmit antenna and a receive antenna, while the reflector and the antenna-system are coupled by a radio signal. The radio signal is sent from the transmit antenna via the reflector towards the receive antenna. The receive antenna is connected with an evaluation unit, which is prepared to measure the deflection between the first end of the object and the second end of the object based on the received radio signal.
Claims11
An arrangement to measure the deflection a blade of a wind turbine, comprising:
- the blade is connected via a root-end with a hub of the wind turbine and the hub is connected with a nacelle of the wind turbine, the blade and the hub rotate around a longitudinal axis of the nacelle;
- a passive reflector arranged at a tip of the blade;
- and
- an antenna system is arranged at a nacelle of the wind turbine and near the root-end of the blade,
- wherein the antenna system contains a transmit antenna and a plurality of receive antennas,
- wherein the plurality of receive antennas are arranged as a linear antenna array,
- wherein the passive reflector and the antenna-system are coupled by a radio signal, which is sent from the transmit antenna via the passive reflector towards the plurality of receive antennas,
- the plurality of receive antennas are arranged in a way that each of the plurality of receive antennas receive the radio signal with a phase-difference, which is assigned to the position of the respective antenna, and
- wherein the plurality of receive antennas is connected with an evaluation unit, which is configured to measure the phase differences and to calculate the deflection of the blade based on the phase-differences.
Dependencies are inferred from the claim text.