Destruction-free and contactless inspection method and inspection apparatus for surfaces of components with ultrasound waves

US9194844B2 · kind B2 · utility

Assignees

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE
• MTU Aero Engines AG · DE

Inventors

• Bernd Koehler · Écully, FR
• Martin Barth · Munich, DE
• Joachim Bamberg · Dachau, DE
• Hans-Uwe Baron · Munich, DE

Key dates

• Filing date: Jul 14, 2011
• Grant date: Nov 24, 2015
• Expiry date: Jul 16, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2291/106
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The invention relates to a method of nondestructive and contactless testing of components (3), wherein ultrasonic waves (6) are irradiated onto the surface of the component (3) at a predefinable, non-perpendicular angle of incidence (9) using an ultrasonic transmission sound transducer (1) arranged spaced apart from the surface of the component (3) and the intensity of the ultrasonic waves (7) reflected from the surface of the component (3) is detected with time resolution and/or frequency resolution by the antenna array elements (2n) of an ultrasonic antenna array (2) configured for detecting ultrasonic waves (7) and the phase shift of the ultrasonic waves guided at the surface of the test body is determined therefrom with respect to the ultrasonic waves (7) directly reflected at the surface of the component (3).