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August 8, 2008

Mtg: Target Characterization Using Time Reversal Symmetry of Wave Propagation

by @ 11:13 am. Filed under ALL, Communications, Electronics Design, Semiconductors

TUESDAY September 16, 2008
SCV Antennas and Propagation Chapter
Speaker: Dr. David H. Chambers, Lawrence Livermore National Laboratory
Time: Pizza and sodas at 6:00 PM; Presentation at 6:30 PM
Cost: none
Place: Cogswell Polytechnical College (Boardroom), 1175 Bordeaux Dr., Sunnyvale
RSVP: not required

The fact that wave propagation looks the same whether time is going forward or backward has been known theoretically since the formulation of wave theory. Only recently, however, have array technology and computers been developed to the point that time reversal of waves can actually be performed in real systems. Experiments using ultrasonic and underwater acoustical arrays have shown enhanced focusing, communications, and imaging through complicated media. Better theoretical understanding of the time reversal symmetry for acoustic and electromagnetic waves has motivated new approaches to imaging and characterization of targets applicable to more conventional array technology. These approaches are based on the decomposition of the time-reversal operator (TRO), which describes the behavior of a time-reversal mirror array. Analysis of this operator shows that the number of eigenstates for a given target depends on the degree of symmetry of the scattering process. This talk will describe the analysis of the TRO for acoustic and electromagnetic scattering from spherical and cylindrical objects. Recent experiments have confirmed the predictions from theory and show that multiple eigenvalues of the TRO can be measured. The utility of the decomposition is illustrated for the case of radar imaging of small objects.

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