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28 March 2012Fingerprinting the Lamb wave signals by using S-transformation
Lamb wave method detects the defects from the propagation characteristics of the created brief harmonic signals.
Generally, the defects are detected by analyzing the delays and amplitudes of the received waves. The envelopes of the
sensory signals may be used to calculate the delays and amplitudes of the received signals. Sometimes, similar envelopes
could be observed at different test conditions. Use of the time-frequency spectra of the s-transformation is proposed for
distinction of the problems when the envelopes of the monitored signals are very similar. In the study, a beam was
compressed from different points with a hydraulic crimping tool. In separate tests, the cross sectional area at the middle
of the beam was reduced by opening slots. The envelopes and time-frequency spectra of the sensory signals were
calculated by using the s-transformation. The difference of the time-frequency spectra successfully distinguished the test
condition when the envelopes were very similar.
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Ibrahim N. Tansel, Ahmet Yapici, Srikanth Korla, Mustafa Demetgul, "Fingerprinting the Lamb wave signals by using S-transformation," Proc. SPIE 8348, Health Monitoring of Structural and Biological Systems 2012, 834805 (28 March 2012);