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

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    1.3621469.pdf
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    Description:
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    Type
    Article
    Authors
    Hanafy, Sherif M.
    Schuster, Gerard T. cc
    KAUST Department
    Center for Subsurface Imaging and Fluid Modeling
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2011-10-03
    Online Publication Date
    2011-10-03
    Print Publication Date
    2011-10
    Permanent link to this record
    http://hdl.handle.net/10754/552137
    
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    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.
    Citation
    Two applications of time reversal mirrors: Seismic radio and seismic radar 2011, 130 (4):1985 The Journal of the Acoustical Society of America
    Publisher
    Acoustical Society of America (ASA)
    Journal
    The Journal of the Acoustical Society of America
    DOI
    10.1121/1.3621469
    PubMed ID
    21973353
    Additional Links
    http://scitation.aip.org/content/asa/journal/jasa/130/4/10.1121/1.3621469
    ae974a485f413a2113503eed53cd6c53
    10.1121/1.3621469
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program; Center for Subsurface Imaging and Fluid Modeling (CSIM)

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