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January 5, 2012

Mtg: Scattering and Migration for Remote and Noninvasive Imaging

by @ 5:06 pm. Filed under ALL, BioEngineering, Communications, Optics/Displays
 

THURSDAY January 19, 2012
OEB Signal Processing Chapter
Speaker: Dr. Sean K. Lehman, Lawrence Livermore National Laboratory
Time: Presentation from 12:30 – 2:00 PM
Cost: none
Place: Livermore Valley Open Campus (LVOC) – Bldg 6475, Lawrence Livermore National Laboratory, Greenville Road, Livermore
RSVP: by email to Ron Kane, kane@ieee.org
Web: www.e-grid.net/docs/1201-oeb-sps.pdf

Wave-based noninvasive and remote sensing and imaging provide methods for investigating structures or objects with minimal or no contact. Delay, scale, and sum migration is one such method (in some circles this is known as ‘beam forming’ or simply ‘migration’ but must not be confused with beam forming for target location in ocean acoustics or migration as used in geophysics). Migration assumes coherently scattered fields will sum constructively at a scattering target and destructively where there is no target. There are additional assumptions that multiple scattering can be neglected and diffraction is minimal although these can be relaxed as the forward model sophistication is increased. This presentation summarizes the forward scattering model and migration (inverse imaging) algorithm derived from it. Acoustic and electromagnetic migration examples are presented on real data for experiments modeling target identification in clutter with a homogeneous background, two planar layered medium buried object imaging, and vertical seismic offset profiling.

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