Abstract
Time reversal (TR) is a technique of localizing acoustical sources using a time reversal mirror (TRM) and is especially useful in reverberant environments. TR is commonly used to find acoustically small sources and in many cases pulsed waveforms are used. Here TR is applied to distributed sources using long duration waveforms. This is done using a straightforward, theoretical, point source propagation computer modeling and data from experimental measurements of jet noise. The quality of the TR focusing versus using different numbers of microphones to constitute the TRM is determined. These results are compared to other imaging techniques and theories of sound radiation from jets.
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