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An Optimization Method in Inverse Elastic Scattering for One-Dimensional Grating Profiles

Published online by Cambridge University Press:  20 August 2015

Johannes Elschner  and
Guanghui Hu
Johannes Elschner*
Affiliation:
Weierstrass Institute, Mohrenstr. 39, Berlin 10117, Germany
Guanghui Hu*
Affiliation:
Weierstrass Institute, Mohrenstr. 39, Berlin 10117, Germany
*
Email address:[email protected]
Corresponding author.Email address:[email protected]
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Abstract

Consider the inverse diffraction problem to determine a two-dimensional periodic structure from scattered elastic waves measured above the structure. We formulate the inverse problem as a least squares optimization problem, following the two-step algorithm by G. Bruckner and J. Elschner [Inverse Probl., 19 (2003), 315-329] for electromagnetic diffraction gratings. Such a method is based on the Kirsch-Kress optimization scheme and consists of two parts: a linear severely ill-posed problem and a nonlinear well-posed one. We apply this method to both smooth (C2) and piecewise linear gratings for the Dirichlet boundary value problem of the Navier equation. Numerical reconstructions from exact and noisy data illustrate the feasibility of the method.

Keywords

35R3074B0578A4635Q93Diffraction gratingelastic wavesprofile reconstructionTikhonov regularizationoptimization method
Type
Research Article
Information
Communications in Computational Physics , Volume 12 , Issue 5 , November 2012 , pp. 1434 - 1460
Copyright
Copyright © Global Science Press Limited 2012

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