Title :
Applied modeling and inverse profiling in electromagnetic non-destructive evaluation
Author :
Marklein, R. ; Rahman, M.U. ; Miao, J.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Univ. of Kassel, Kassel, Germany
Abstract :
This paper presents three examples of applied numerical modeling and inverse profiling in electromagnetic non-destructive testing. In the first example, we discuss numerical modeling and optimization of eddy current sensors for in-line inspection of hot wire steel. To detect longitudinal cracks a series of new sensors are modelled and optimized by numerical modeling and is successfully tested. The second example presents the application of a time-domain technique to reconstruct the unknown permittivity and electric conductivity profile of a one-dimensional slab of finite length. The inverse scattering problem is solved by an Invariant Embedding Method which requires a finite time trace of reflection data and therefore is suitable for reconstructing the material parameters in real-time. The implemented method is validated against synthetic and measured Time Domain Reflectometry data. The third example demonstrates the application of the Contrast Source Inversion method to reconstruct the 2-D permittivity profile of a beech tree. Thus, the discussed applications present an identified need of numerical modeling and inverse profiling in electromagnetic non-destructive evaluation.
Keywords :
crack detection; eddy current testing; electric sensing devices; electrical conductivity; electromagnetic wave scattering; inverse problems; numerical analysis; optimisation; permittivity; slabs; steel; time-domain reflectometry; trees (mathematics); 2D permittivity profile; applied numerical modeling; beech tree; contrast source inversion method; eddy current sensor; electric conductivity profile; electromagnetic nondestructive testing; finite time trace; hot wire steel; in-line inspection; invariant embedding method; inverse profiling; inverse scattering problem; longitudinal crack detection; material parameter reconstruction; one-dimensional slab; optimization; time domain reflectometry data; Coils; Eddy currents; Inverse problems; Permittivity; Sensors; Steel; Wire;
Conference_Titel :
Electromagnetic Theory (EMTS), 2010 URSI International Symposium on
Conference_Location :
Berlin
Print_ISBN :
978-1-4244-5155-5
Electronic_ISBN :
978-1-4244-5154-8
DOI :
10.1109/URSI-EMTS.2010.5637346