Patent ID: 11939956
Assignee: LM WIND POWER A/S
Field: Measurement (Instruments)
Classification: CPC F  G  Y | IPC F  G

Claim 0:
1. A method for detecting concealed emerging defects in a structure of a wind turbine blade, the method comprising:
fastening a first acoustical transducer to a first area of a surface of the structure;
attaching the wind turbine blade to a hub of a wind turbine:
operating the wind turbine and while operating the wind turbine:
emitting by the first acoustical transducer a first primary acoustic signal through the surface of the structure and into the structure; and
receiving by the first acoustical transducer a first secondary acoustic signal indicative of an echo of the first primary acoustic signal;

analysing the first secondary acoustic signal to obtain one or more first signal parameters; and
evaluating presence of a first defect in the structure based on the one or more signal parameters.