eprintid: 363
rev_number: 6
eprint_status: archive
userid: 5
dir: disk0/00/00/03/63
datestamp: 2011-07-11
lastmod: 2013-07-03 08:36:50
status_changed: 2013-07-03 08:36:50
type: techreport
metadata_visibility: show
item_issues_count: 0
creators_name: Donelli, Massimo
creators_name: Benedetti, Manuel
creators_name: Lesselier, D.
creators_name: Massa, Andrea
title: A Qualitative Two-Step Inversion Approach for the Reconstruction of Subsurface Defects
ispublished: pub
subjects: TU
full_text_status: public
note: This version is a pre-print of the final version available at IEEE.
abstract: The detection of subsurface objects such as landmine or archaeological find, the location of sedimentary layer for geological inspections, or the identification of cracks and voids in host structures are some examples of applications where the reconstruction of the position and the shape of unknown targets embedded in inaccessible regions is required. In this framework, the imaging methods based on electromagnetic inverse scattering theory can play a key role [1]. As a matter of fact, the electromagnetic and geometric properties of the region under test can be quantitatively reconstructed starting from the observation of the scattered field. Unfortunately, the problem at hand presents several drawbacks such as non-linearity and ill-posedness that need to be taken into account especially when dealing with complex scenarios. However, a considerable amount of a-priori information is generally available in nondestructive testing and evaluation (NDT/NDE) applications, since the crack to be reconstructed is located in a known host medium [2]. Such a peculiarity can be profitably exploited in order to cope with the lack of information characterizing the inverse problem. In such a framework, microwave methodologies based on the use of heuristic optimizers and on the exploitation of the a-priori information have been effectively used for the detection of a crack in a known host structure [3] or when dealing with more complex and realistic scenarios characterized by multiple defects [4]. The proposed approaches demonstrate their feasibility and effectiveness in providing a coarse estimation of the targets in a qualitative fashion, but they are not suitable for the retrieval of complex shapes. In this work, a two-step procedure successfully adopted for NDT/NDE problems [5] has been employed for the qualitative reconstruction of complex subsurface targets. In particular, at the first step the target is localized and its shape is roughly estimated starting from the knowledge of the scattered field. Then, the second step is aimed at refining the contour of the target by means of a shape optimization technique characterized by the evolution of a level set function [6].
date: 2011-01
date_type: published
institution: University of Trento
department: informaticat
refereed: FALSE
referencetext: [1] 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, Jun. 1989. [2] S. Kharkovsky and R. Zoughi, “Microwave and millimeter wave nondestructive testing and evaluation – Overview and recent advances,” IEEE Instrumentation and Measurement Magazine, vol.10, Apr. 2007. [3] M. Benedetti, M. Donelli, G. Franceschini, M. Pastorino, and A. Massa, “Effective exploitation of the a priori information through a microwave imaging procedure based on the SMW for NDE/NDT applications,” IEEE Trans. Geosci. Remote Sensing, vol. 43, pp. 2584-2592, 2005. [4] M. Benedetti, M. Donelli, and A. Massa, “Multicrack detection in two-dimensional structures by means of GA-based strategies,” IEEE Trans. Antennas Propagat., vol. 55, pp. 205-215, 2007. [5] M. Benedetti, M. Donelli, D. Lesselier, and A. Massa, “A two step inverse scattering procedure for the qualitative imaging of homogeneous cracks in known host media – Preliminary results,” IEEE Antennas and Wireless Propagation Letters, vol. 6, pp. 592-595, 2007. [6] O. Dorn and D. Lesselier, “Level set methods for inverse scattering,” Inverse Problems, 22, pp. 67-131, 2006.
citation:   Donelli, Massimo and Benedetti, Manuel and Lesselier, D. and Massa, Andrea  (2011) A Qualitative Two-Step Inversion Approach for the Reconstruction of Subsurface Defects.  [Technical Report]     
document_url: http://www.eledia.org/students-reports/363/1/DISI-11-185.C182.pdf