Abstract
Characterizing underwater objects is often accomplished with optical imaging, but this task is rendered difficult or impossible if the water is turbid or the object is encrusted or buried. Often imaging is capable of identifying approximate dimensions, but lacks the ability to differentiate between naturally occurring and manmade objects. However, every resonant target possesses its own (nearly) unique ID: its vibrational modal spectrum, if it can be excited. This study reports on the use of strongly collapsing cavitation bubbles, generated via dielectric breakdown, to impulsively excite resonant modes of an underwater object. [Work funded by Department of the Navy.]
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