Resonant Frequency Testing in the Ceramics Industry

Authors: Prof. W. Lehnhauser

Original Language: German (see German version)

Abstract

Sound or tap tests have long been known in the ceramics field. When striking a ceramic body (tube, vessel, tile, etc.) with a hard object, one can tell from the sound whether a body is porous or dense - weakly or highly fired. However, this assessment is not quantitative and depends on the type of body, mass, density, and not least on the subjective judgment of the testing person. With the “GrindoSonic device,” a frequency measuring instrument was developed to measure the fundamental vibrations (natural frequencies) occurring during impact excitation.