Abstract
Time reversal is a signal processing method used either to communicate privately between two locations, focus high amplitude energy to a selected spatial location, or to locate and characterize an unknown source. It has been used in acoustics for various applications including secure underwater communications, biomedical applications (e.g., acoustic lithotripsy), and for nondestructive evaluation of structures and mechanical parts. Time reversal techniques require that a calibration signal (i.e., Green’s function, impulse response, transfer function, etc.) be obtained between the source and receiver location(s). Assuming that conditions do not change, the calibration signal(s) may be used to send wave energy to the target location to provide a coherent reconstruction of a source or constructive interference at that selected location. This presentation will discuss how time reversal techniques work, introduce various types of processing used, and review various applications of the technique. If that does not sound interesting enough, videos will be shown of LEGO minifigures being knocked over with focused vibrations and targeted candles will be blown out with focused loud sound.
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