Multi-mode nonlinear ultrasonic phased array for closed crack imaging

Yoshikazu Ohara, Jack Potter, Sylvain Haupert, Hiromichi Nakajima, Toshihiro Tsuji, Tsuyoshi Mihara

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


Crack closure is one of the serious issues in ultrasonic testing that may cause underestimation or misdetection. Nonlinear ultrasonics is a primary means to solve this problem. Recently, several techniques using ultrasonic phased arrays to measure elastic nonlinearity, referred to commonly as nonlinear ultrasonic phased array imaging, have been proposed and have had their efficacy demonstrated in closed-crack specimens. Note that most of them use nonlinearly scattered longitudinal waves. On the other hand, nonlinear scattering at closed cracks can generate not only longitudinal waves but also mode-converted shear waves, which may have different characteristics from longitudinal one. Here we propose to use both longitudinal and mode-converted shear waves in nonlinear ultrasonic phased array imaging, which is called multi-mode nonlinear ultrasonic phased array imaging. We examined the nonlinear scattering in numerical simulation. Subsequently, it was also experimentally demonstrated.

Original languageEnglish
Article number055001
JournalProceedings of Meetings on Acoustics
Issue number1
Publication statusPublished - 2018
Event21st International Symposium on Nonlinear Acoustics, ISNA 2018 - Santa Fe, United States
Duration: 2018 Jul 92018 Jul 13

ASJC Scopus subject areas

  • Acoustics and Ultrasonics


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