Abstract by Paige Simpson
Physics and Astronomy
Experimental analysis of the size and shape of time reversal chaotic cavities for nondestructive evaluation
Time reversal may be used as an energy-focusing technique. It is applied in many different ways including, for example, nondestructively evaluating cracks in structures, reconstructing a source event, and providing an optimal carrier signal for communication. In nondestructive evaluation applications, it is often of interest to study small samples or samples that do not lend themselves to the bonding of transducers to their surfaces. A chaotic cavity provides space for the attachment of transducers as well as a more reverberant environment, which is critical to the quality of time reversal focusing. Transducers are attached to the chaotic cavity which is attached to the sample under test. The goal of this research is to explore the dependence of the quality of the time reversal focusing on the size and shape of the chaotic cavity used. An optimal chaotic cavity will produce the largest focusing amplitude, best spatial resolution, and most linear focusing of the time reversed signal. The presentation will provide experimental results for time reversal focusing experiments conducted on various sized and shaped aluminum blocks.