Two applications of time reversal mirrors: Seismic radio and seismic radar

Sherif M. Hanafy, Gerard T. Schuster

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Two seismic applications of time reversal mirrors (TRMs) are introduced and tested with field experiments. The first one is sending, receiving, and decoding coded messages similar to a radio except seismic waves are used. The second one is, similar to radar surveillance, detecting and tracking a moving object(s) in a remote area, including the determination of the objects speed of movement. Both applications require the prior recording of calibrationGreen’s functions in the area of interest. This reference Green’s function will be used as a codebook to decrypt the coded message in the first application and as a moving sensor for the second application. Field tests show that seismicradar can detect the moving coordinates ( x(t), y(t), z(t)) of a person running through a calibration site. This information also allows for a calculation of his velocity as a function of location. Results with the seismic radio are successful in seismically detecting and decoding coded pulses produced by a hammer. Both seismic radio and radar are highly robust to signals in high noise environments due to the super-stacking property of TRMs.
Original languageEnglish (US)
Pages (from-to)1985-1994
Number of pages10
JournalThe Journal of the Acoustical Society of America
Volume130
Issue number4
DOIs
StatePublished - Oct 3 2011

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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