Ultrafast phased-array imaging with pump excitation for closed-crack imaging

Yoshikazu Ohara, Sylvain Haupert, Sinan Li

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Nondestructive evaluation of closed cracks is one of the most challenging problems in ultrasonic testing. Here, we propose a novel closed-crack imaging technique combining ultrafast phased-array with pump excitation. The pump excitation with kHz frequency can effectively induce the crack opening/closing behaviors since it can generate a large displacement of 1000 nm order. At the same time, ultrafast phased-array imaging, i.e. plane wave imaging, with MHz frequency stroboscopically captures the high-speed crack dynamics induced by pump excitation. We successfully proved the concept in a closed fatigue crack specimen.

Original languageEnglish
Article number126505
JournalApplied Physics Express
Issue number12
Publication statusPublished - 2021 Dec


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