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Impact-echo signature analysis (IESA)

A new evaluation procedure for impact echo data based on spectrograms
Schlag-Echo Signaturanalyse (IESA). Ein neues Auswertungsverfahren für Schlag-Echo-Daten auf der Grundlage von Spektrogrammen
: Schubert, F.

Deutsche Gesellschaft für Zerstörungsfreie Prüfung e.V. -DGZfP-, Berlin; European Federation for Non-Destructive Testing -EFNDT-:
9th European Conference on NDT. ECNDT Berlin 2006. CD-ROM : September 25 - 29, 2006
Berlin: DGZfP, 2006 (DGZfP Proceedings BB 103-CD)
ISBN: 3-931381-86-2
15 pp.
European Conference on NDT (ECNDT) <9, 2006, Berlin>
Conference Paper
Fraunhofer IZFP, Institutsteil Dresden ( IKTS-MD) ()
zerstörungsfreie Prüfung; Schlagprüfung; Signaturanalyse; Auswerteverfahren; Spektrogramm; Zeitbereichanalyse; Frequenzbereichsanalyse

A new evaluation procedure for impact-echo data combining time-domain and frequency-domain analysis is presented. Thereby, normalized spectrograms of the time-domain signals detected at single measuring points are used as acoustic fingerprints of the structure and are compared with a reference spectrogram representing the regular, non-damaged state of the specimen. The corresponding correlation coefficients are a quantitative measure of the deviation of the actual measuring point signature from the reference state signature. Since existence and position of various defects and structural elements are correlated with characteristic changes in specific time-frequency regions, individual selections of spectrogram windows allows for a selective correlation analysis. As a result, damage specific signature plots can be obtained, representing the probability for the existence of a particular kind of damage or structural element.
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