PROCEDURE FOR NON-DESTRUCTIVE TESTING OF A THIN-WALLED STRUCTURE BASED ON A TOMOGRAPHIC ULTRASOUND WAVE ANALYSIS

摘要

A method is described for non-destructive testing of a thin-walled structure based on ultrasonic tomographic ultrasound analysis in which two ultrasound transducer arrays are arranged on the thin-walled structure at a distance from each other for emitting and receiving guided ultrasound waves along the thin-walled structure and through which the structure is subsonic and transmitting ultrasonic wave components are detected, based on which a check information is reconstructed from the thin-walled structure. The method is characterized in that in a first Durchschallungsvorgang the structure with supersonic ultrasonic waves of at least a first type is durchschallt and the structure transmitting and / or reflected in the structure ultrasonic wave components are detected with respect to their phase and group velocities and / or amplitude. In a second through-sounding process, the structure is transilluminated with guided ultrasound waves of at least one second type, the ultrasound wave components transmitting and / or reflecting in the structure being detected with respect to their phase and group velocities and / or amplitude. In the following, the phase and group velocities and / or amplitudes of the detected ultrasonic wave components of the guided ultrasonic waves of the first and second types of reconstruction are taken as a basis, the guided ultrasonic waves of the first and second types differing in at least two of the following properties: wavelength, frequency, wave type , Wave mode.