Abstract:
Resonance inspection - the answer to new industrial demands with regard to quality assurance
by U. Schlengermann, W. Hansen, Krautkrämer GmbH & Co.
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ABSTRACT
The method introduced here is a resonance inspection method using mono-frequent pulses which can be generated by a digital signal generator in any frequency windows required. The signal transformation from time to frequency domain, which would otherwise be necessary for the acoustic analysis, is therefore not necessary.
Due to the selective excitation of characteristic (diagnostic) frequencies this resonance method is very fast but at the same time more informative than the broadband excitation with the classical acoustic analysis.
As this new resonance method can do without any couplant in spite of the piezoelectric sensors, and besides that, it enables to store the test results for every test object as a file, this is the first method to open up the possibility for a complete and low-cost nondestructive testing of mass-produced parts within the production process which can be completely automated.