Ultrasonic Testing - COMSOL.com

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Voltage [V]Experimental sessionThe energizing signal is a square wave with high input voltage of 500 V,which develops in a time interval of 9.3μs.The high intensity of this signal allowed signals on the other side of the wall to bedetected even if strongly attenuated.<strong>COMSOL</strong> CONFERENCE EUROPE 2012
Experimental sessionA signal has been acquired in each point of the grid of receivers. From each node ofthe grid, several features in both time and frequency domain can been extracted.Time domain• Propagation velocity• Maximum peak-peak amplitude• Maximum absolute amplitude• Minimum absolute amplitude• Mean value of normalized amplitude• Variance of normalized amplitude• Time–reversibility• Third order auto-covariance• Mean value of normalized signal envelope• Variance of normalized signal envelope• Local rise time from 25% level to peak ofnormalized signal envelope• Local rise time from 50% level to peak ofnormalized signal envelope• Signal power• Travel timeFrequency Domain• Spectrum principal frequency• Spectrum normalized maximum amplitude• Input signal attenuation• Spectrum central frequency• Spectrum Bandwidth• Spectrum normalized mean value• Spectrum normalized varianceSome of the features that are normally considered to extract information about faults from the signal<strong>COMSOL</strong> CONFERENCE EUROPE 2012
Page 1 and 2: Excerpt from the Proceedings of the
Page 3 and 4: IntroductionThe Research Group in E
Page 5 and 6: Non-Destructive TestingAmong NDTs,
Page 7 and 8: Ultrasonic TestingThe testing metho
Page 9 and 10: Ultrasonic TestingDue to media diss
Page 11 and 12: Experimental sessionFront view of t
Page 13: Experimental set-upUltrasonic measu
Page 17 and 18: Experimental signals crossing the 4
Page 19 and 20: Simulations with COMSOL Multiphisyc
Page 27 and 28: Simulated signals crossing the 4 pa
Page 29 and 30: ResultsSimilarly to what is found f
Page 31 and 32: ConclusionsThe purpose of this work
Page 33: Thanks for your kind attentionThank

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