TY - GEN
T1 - Imaging and characterizing damage using time reversed acoustics
AU - Ulrich, T. J.
AU - Sutin, A. M.
AU - Johnson, P. A.
PY - 2007
Y1 - 2007
N2 - Nonlinear elastic wave spectroscopy (NEWS) has been shown to exhibit a high degree of sensitivity to both distributed and isolated nonlinear scatterers in solids. In the case of an isolated nonlinear scatterer such as a crack, by combining the elastic energy localization of the time reversal mirror (TRM) with NEWS, it is shown here that one can isolate surfacial nonlinear scatterers in solids. The experiments presented here are conducted in a doped glass block applying two different fixed frequency time reversed signals at each focal point and scanning over a localized nonlinear scatterer (a complex crack). The results show a distinct increase in nonlinear response, via intermodulation distortion, over the damaged area. The techniques described herein provide the means to discriminate between linear and nonlinear scatterers, and thus to ultimately image and characterize damaged regions.
AB - Nonlinear elastic wave spectroscopy (NEWS) has been shown to exhibit a high degree of sensitivity to both distributed and isolated nonlinear scatterers in solids. In the case of an isolated nonlinear scatterer such as a crack, by combining the elastic energy localization of the time reversal mirror (TRM) with NEWS, it is shown here that one can isolate surfacial nonlinear scatterers in solids. The experiments presented here are conducted in a doped glass block applying two different fixed frequency time reversed signals at each focal point and scanning over a localized nonlinear scatterer (a complex crack). The results show a distinct increase in nonlinear response, via intermodulation distortion, over the damaged area. The techniques described herein provide the means to discriminate between linear and nonlinear scatterers, and thus to ultimately image and characterize damaged regions.
KW - Crack characterization
KW - Imaging
KW - Nonlinear elasticity
KW - Time reversed acoustics
UR - http://www.scopus.com/inward/record.url?scp=34248182900&partnerID=8YFLogxK
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U2 - 10.1063/1.2718032
DO - 10.1063/1.2718032
M3 - Conference contribution
AN - SCOPUS:34248182900
SN - 0735403996
SN - 9780735403994
T3 - AIP Conference Proceedings
SP - 650
EP - 656
BT - Review of Progress in Quantitative Nondestructive Evaluation
T2 - REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION
Y2 - 30 July 2006 through 4 August 2006
ER -