You have come across my website. My name is Dave and I am a recent Ph. D. graduate of physics at North Carolina State University. My current research interests are in using time-reversal in acoustics to locate objects buried in the seafloor. I also have a few other projects that involve using GPS maps to determine areas of a shoreline that susecptible to erosion.

Time reversal is the emphasis of my thesis and it is an interesting topic in acoustics. Time reversal is nothing more than transmitting a recorded signal in the reverse temporal order that it was received. Granted, this does not sound like a major advancement. Heck, it sounds like running a movie backwards, which is entertaining in it's own right. But, what makes time reversal special is that the sound will travel along the paths that it took to get to where it was recorded. Imagine a source that sends out some sound, like your favorite Van Halen tune (yeah, I know I'm showing my age), and you record it at some other location. The next step is to reverse the order of recording of a sample of the recorded signal. Then you might want to increase the amplitude of that signal before you send it back. The time-reversed signal will focus to the source location. This configuration is known as a time-reversal mirror.