Patent ID: 11913909
Assignee: ROSEN SWISS AG
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A method for determining the extent of defects in a test specimen, the method comprising the steps of:
exciting, via at least one transmitting transducer, sound waves in the ultrasonic range, causing the sound waves to propagate in the form of a sound beam, the acoustic axis of which forms an angle (α) with a normal to a surface of the test specimen facing the transmitting transducer,
coupling the sound waves into the test specimen obliquely to reflect in a V-shaped manner at an outer interface of the test specimen,
receiving, via at least one first receiving transducer spaced apart from the transmitting transducer, the sound waves reflected at the interface of the test specimen,
determining, via an evaluation unit, an extent of a defect arranged within a sound path based on a reduction of the amplitude of the sound waves received by the first receiving transducer,
wherein the transmitting transducer and the first receiving transducer are guided past the test specimen at an at least substantially constant distance therefrom and the sound waves are coupled into the test specimen with an advance section via a liquid medium;
wherein a second receiving transducer receives sound waves reflected at a defect;
wherein the crack depth is determined from the difference between the amplitudes which the first receiving transducer and the second receiving transducer have received.