Method and device for non-destructive material testing of a test object using ultrasonic waves

A method for nondestructive material testing of a sectionally solid test object by an application of ultrasonic waves to the test object and a detection of the ultrasonic waves reflected inside the test object, the method comprising:

• subdividing the test object into a plurality of predetermined volume elements using an aid of a computer;
• applying ultrasound to the test object at a plurality of surface elements while scanning a surface or a surface section of the test object;
• detecting the sound waves reflected at the plurality of volume elements while scanning the plurality of surface elements on the surface or on the surface section of the test object;
• adding, in-phase, the sound waves reflected at the plurality of volume elements and detected at the plurality of surface elements of the surface of the test object within a predetermined angular interval about the acoustic axis;
• and
• using an angle-dependent amplitude distribution in a sound field of a test head,
• wherein the angle-dependent amplitude distribution in a sound field of the test head is used to determine a plurality of amplitudes of the reflected sound waves, and
• wherein a specific number of amplitudes are summed with the predetermined angular interval about the acoustic axis in order to calculate a size of a reference reflector that would produce a same amplitude sum.