TY - JOUR

T1 - The generalized polarization tensors for resolved imaging Part II

T2 - Shape and electromagnetic parameters reconstruction of an electromagnetic inclusion from multistatic measurements

AU - Ammari, Habib

AU - Kang, Hyeonbae

AU - Kim, Eunjoo

AU - Lee, June Yub

PY - 2012

Y1 - 2012

N2 - This paper deals with the problem of reconstructing the electromagnetic parameters and the shape of a target from multi-static response matrix measurements at a single frequency. The target is of characteristic size less than the operating wavelength. Using small-volume asymptotic expansions of the measurements of high-order, we show how the electromagnetic parameters and the equivalent ellipse of the target can be reconstructed. The asymptotic expansions of the measurements are written in terms of the new concept of frequency dependent polarization tensors. Moreover, we extend the optimization approach proposed in Part I to image geometric details of an electromagnetic target that are finer than the equivalent ellipse. The equivalent ellipse still provides a good initial guess for the optimization procedure. However, compared to the conductivity case in Part I, the cost functional measures the discrepancy between the computed and measured high-order frequency dependent polarization tensors rather than between the generalized polarization tensors. The main reason for such a modification of the cost functional is the fact that the (measured) frequency dependent polarization tensors can be easily obtained from multistatic measurements by solving a linear system while the derivation of the generalized polarization tensors from measurements requires more delicate treatment. The proposed methods are numerically implemented to demonstrate their validity and efficiency.

AB - This paper deals with the problem of reconstructing the electromagnetic parameters and the shape of a target from multi-static response matrix measurements at a single frequency. The target is of characteristic size less than the operating wavelength. Using small-volume asymptotic expansions of the measurements of high-order, we show how the electromagnetic parameters and the equivalent ellipse of the target can be reconstructed. The asymptotic expansions of the measurements are written in terms of the new concept of frequency dependent polarization tensors. Moreover, we extend the optimization approach proposed in Part I to image geometric details of an electromagnetic target that are finer than the equivalent ellipse. The equivalent ellipse still provides a good initial guess for the optimization procedure. However, compared to the conductivity case in Part I, the cost functional measures the discrepancy between the computed and measured high-order frequency dependent polarization tensors rather than between the generalized polarization tensors. The main reason for such a modification of the cost functional is the fact that the (measured) frequency dependent polarization tensors can be easily obtained from multistatic measurements by solving a linear system while the derivation of the generalized polarization tensors from measurements requires more delicate treatment. The proposed methods are numerically implemented to demonstrate their validity and efficiency.

KW - Asymptotic expansions

KW - Frequency dependent polarization tensors

KW - Generalized polarization tensors

KW - Shape recovery

KW - Target reconstruction

KW - Wave imaging

UR - http://www.scopus.com/inward/record.url?scp=84858968449&partnerID=8YFLogxK

U2 - 10.1090/S0025-5718-2011-02534-2

DO - 10.1090/S0025-5718-2011-02534-2

M3 - Article

AN - SCOPUS:84858968449

SN - 0025-5718

VL - 81

SP - 839

EP - 860

JO - Mathematics of Computation

JF - Mathematics of Computation

IS - 278

ER -