Method and device for ultrasonic testing

Abstract

The invention relates to a method for ultrasonically testing a test specimen (6), which comprises a bore (26) extending in an axial direction (L), wherein the probe (2) is disposed inside the bore (26) and extends in the axial direction (L). The probe (2) comprises a plurality of sensor rings (81-88) disposed behind one another in the axial direction (L) and spaced apart from each other, said sensor rings extending in a plane perpendicular to the axial direction (L) and comprising a plurality of ultrasonic transducers (10) spaced apart from each other. The ultrasonic transducers (10) are disposed in a segment (30) of a particular sensor ring (81-88), which extends in the circumferential direction of the particular sensor ring (81-88) on at least a partial section of a circumference of the particular sensor ring (81-88). For the ultrasonic testing of the test specimen (6), an ultrasonic test pulse originating from the ultrasonic transducers (10) of a segment (30) of a sensor ring (81-88) is coupled into the test specimen (6). Then a plurality of echo signals (20) are received with a first and a second ultrasonic transducer (10), wherein said transducers are disposed spatially apart from each other. The echo signals (20) are caused by reflection of the coupled-in ultrasonic test pulse from one and the same defect (16) present in the test specimen (6).

Description

technical field [0001] Method and apparatus for ultrasonic testing. Background technique [0002] Defects or imperfections in the volume and on the surface of components or technical components can be detected with the aid of ultrasound. The advantage of the pulse-echo technique, which is preferably used in ultrasonic testing, is that surface separations, such as cracks, can be detected very well. A prerequisite for reliable detection is that the defects present in the test piece are properly scanned by the acoustic waves. Ultrasonic testing can be used both in manufacturing as an integrated test for quality assurance and as a periodic test in the field of repair and maintenance to ensure the suitability of the test object for continued use. [0003] In principle, only defects for which ultrasonic echoes are received are detected in ultrasonic testing by the pulse echo method. The question of whether ultrasonic echoes reflected by defects can be detected by means of the d...

AI Technical Summary

Problems solved by technology

A disadvantage of this known detection method is the relatively long detection time, since the borehole surface is scanned eg helically

Furthermore, the detection of the condition via the substitute reflector results in only a weak or even no detection of actual defects with other reflective properties

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