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Nondestructive testing of ceramics by computed tomography and high-frequency ultrasonics

: Arnold, W.; Maisl, M.; Netzelmann, U.; Reiter, H.

Carlsson, R.; Johansson, T.; Kahlmann, L. ; Swedish Ceramic Society -SKS-:
4th International Symposium on Ceramic materials and components for engines. Proceedings
London: Elsevier, 1992
ISBN: 1-85166-776-8
International Symposium on Ceramic Materials and Components for Engines <4, 1991, Göteborg>
Fraunhofer IZFP ()
computed tomography; Computertomographie; dreidimensionale Visualisierung; threedimensional visualisation; Ultraschall; ultrasonic

An ultrasonic pulse-echo inspection system (up to 100 MHz) has been equiped with a fast digitizer in order to allow a full volume acquisition of ultrasonic data. A powerful workstation with modern visualtization software is used to represent the ultrasonic voume data. Any desired cross section plan inside the object can be selected and displayed in real time. Snall defects and variations in the density distribution are imaged by the computed tomography (fCT) with high contrast. In the reconstructed cross sections a pixel size down to 10 fm is realized. Among all the requirements which a system with high resolution capabilities has to accomplish, we are especially discussing the influence of the raiographic imaging system on the achievable resolution. The same software, used to represent the ultrasonic volume data, is also employed for d 3D-visualization of the 2D reconstructed cross sections of the fCT.