eprintid: 526 rev_number: 5 eprint_status: archive userid: 5 dir: disk0/00/00/05/26 datestamp: 2008-11-28 lastmod: 2013-06-30 13:14:21 status_changed: 2013-06-30 13:14:21 type: techreport metadata_visibility: show item_issues_count: 0 creators_name: Massa, Andrea creators_name: ELEDIA, Laboratory title: A Two-Step Inverse Scattering Procedure for the Qualitative Imaging of Homogeneous Cracks in Known Host Media-Preliminary Results ispublished: unpub subjects: TU full_text_status: public abstract: In the framework of nondestructive evaluation and testing, microwave inverse scattering approaches demonstrated their effectiveness and the feasibility of detecting unknown anomalies in dielectric materials. In this paper, an innovative technique is proposed in order to enhance their reconstruction accuracy. The approach is aimed at firstly estimating the region-of-interest where the defect is supposed to be located and then at improving the qualitative imaging of the crack through a level-set based shaping procedure. In order to assess the effectiveness of the proposed approach, representative numerical results concerned with different scenarios and blurred data are presented and discussed. date: 2008-11 date_type: published institution: University of Trento department: informaticat refereed: FALSE referencetext: [1] P. J. Shull, Nondestructive Evaluation: Theory, Techniques and Applications. CRC Press, 2002. [2] R. Zoughi, Microwave Nondestructive Testing and Evaluation, Kluwer Academic Publishers, The Netherlands, 2000. [3] J. C. Bolomey, “Recent European developments in active microwave imaging for industrial, scientific and medical applications,” IEEE Trans. Microwave Theory Tech., vol. 37, pp. 2109–2117, June 1989. [4] K. Meyer, K. J. Langenberg, and R. Schneider, “Microwave imaging of defects in solids,” in Proc. 21st Annual Review of Progress in Quantitative NDE, Snowmass Village, CO, July 31-Aug. 5 1994. [5] S. Caorsi, A. Massa, M. Pastorino, and M. Donelli, “Improved microwave imaging procedure for nondestructive evaluations of two-dimensional structures,” IEEE Trans. Antennas Propagat., Vol. 52, pp. 1386-1397, Jun. 2004. [6] Y. Rahmat Samii and E. Michielssen, Electromagnetic Optimization by Genetic Algorithms. New York: Wiley 1999. [7] O. Dorn and D. Lesselier, “Level set methods for inverse scattering”, Inverse Problems, 22, pp. R67-R131, 2006. [8] S. Caorsi, G. L. Gragnani, M. Pastorino, and M. Rebagliati, “A model-driven approach to microwave diagnostics in biomedical applications,” IEEE Trans. Microwave Theory Tech., vol. 44, pp. 1910-1920, 1996. [9] A. Litman, D. Lesselier, and F. Santosa, “Reconstruction of a two-dimensional binary obstacle by controlled evolution of a level-set,” Inverse Problem, Vol. 14, pp. 685-706, 1998. [10] S. Osher and J. A. Sethian “Fronts propagating with curvature-dependent speed: algorithms based on Hamilton–Jacobi formulations,” J. Comput. Phys. 79, pp. 12–49, 1988. [11] J. A. Sethian, Levelset Methods and Fast Marching Methods. Monographs on Applied and Computational Mathematics, Cambridge: Cambridge University Press, 2nd ed., 1999. [12] S. Caorsi, M. Donelli, and A. Massa, “Detection, location, and imaging of multiple scatterers by means of the iterative multi-scaling method,” IEEE Trans. Microwave Theory Tech., vol. 52, no. 4, pp. 1217-1228, 2004. citation: Massa, Andrea and ELEDIA, Laboratory (2008) A Two-Step Inverse Scattering Procedure for the Qualitative Imaging of Homogeneous Cracks in Known Host Media-Preliminary Results. [Technical Report] (Unpublished) document_url: http://www.eledia.org/students-reports/526/1/DISI-08-065.pdf