International Journal of Applied Electromagnetics and Mechanics - Volume 37, issue 2-3

Authors: Mateev, Valentin | Marinova, Iliana

Article Type: Research Article

Abstract: In this paper a method for characterization of live tissue electromagnetic properties is proposed. The method combines data, acquired by experimental computer system for bio-impedance measurements, and image data obtained by infrared camera. The data from impedance analyzer and from infrared camera are collected simultaneously for a given time period. The impedance data are associated with infrared image data for electromagnetic properties determination. The method developed is applied to evaluate the electromagnetic …properties of biological tissues. The proposed method is applicable for local electric properties determination in inhomogeneous samples with random form. Show more

Keywords: Bioimpedance, measurement system, electromagnetic properties, IR thermal images

DOI: 10.3233/JAE-2011-1389

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 37, no. 2-3, pp. 181-187, 2011

Authors: Park, Il Han | Chai, Jangbom | Kim, Young Sun | Baek, Myung Ki

Article Type: Research Article

Abstract: This paper proposes a nonlinear magnetic method to estimate the thickness of carbon steel pipe used in the secondary steam cycle of nuclear power plants. The principle of the proposed method is based on utilizing the nonlinear property of magnetic saturation in carbon steel. A magnetic sensor system for the nonlinear magnetic method is designed by the magnetic circuit concept, and is modeled and analyzed with the finite element method and an equivalent electric circuit. The …sensor system is built to experimentally test its performance in the estimation of wall thinning. To demonstrate the feasibility and validity of the proposed nonlinear magnetic method, the measured data from the sensor system are used to estimate the wall thinning, and are compared with the analysis results. Show more

Keywords: Wall thinning, nonlinear magnetic method, magnetic sensor, FEM, magnetic saturation

DOI: 10.3233/JAE-2011-1390

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 37, no. 2-3, pp. 189-198, 2011

Authors: Reimund, Verena | Blome, Mark | Pelkner, Matthias | Kreutzbruck, Marc

Article Type: Research Article

Abstract: We present a fast inverse scheme that is capable of simultaneously estimating the parameters depth, opening and length for rectangular 3D geometries of surface-breaking defects. The parameter estimation is realized by an iterative least-squares minimization using the trust-region reflective algorithm. A semi-analytic magnetic dipole model that allows the sensor characteristics to be incorporated is used for predicting the stray magnetic fields. Giant magneto-resistance (GMR) measurements were carried out on a test specimen …that includes a series of artificial defects. For the estimation of the defect depths relative errors between 0.6% and 15.9% have been obtained. Due to its very low computational costs, the inverse scheme can suitably be employed in automated production environments. Show more

Keywords: Magnetic flux leakage, GMR sensor, nonlinear least-squares optimization

DOI: 10.3233/JAE-2011-1391

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 37, no. 2-3, pp. 199-205, 2011

Authors: Ilić, Saša S. | Aleksič, Slavoljub R. | Raičević, Nebojša B.

Article Type: Research Article

Abstract: Theoretical analysis of a vertical broadside symmetrically coupled strip line assuming TEM propagation mode is presented in the paper. The effective dielectric permittivity and characteristic impedance of the analysed strip line is determined applying the Equivalent Electrodes Method (EEM), and the results are compared with the ones obtained using the Finite Element Method (FEM). The paper shows determination of the closed-form Green's function of uniform charge per unit line length placed in an anisotropic medium between …two parallel infinite grounded plates. Additionally, dielectric permittivity tensor has a diagonal form, and both, even and odd, modes are considered. Show more

Keywords: Equivalent Electrodes Method (EEM), Separation of Variables Method (SVM), Perfect Electric Conductor (PEC), anisotropic medium, effective permittivity, Finite Element Method (FEM)

DOI: 10.3233/JAE-2011-1392

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 37, no. 2-3, pp. 207-214, 2011

Authors: Szymanik, Barbara | Gratkowski, Stanisław

Article Type: Research Article

Abstract: Landmines, which affect numerous of territories in the whole world, pose a serious threat mostly to civilians. Therefore there's no doubt that the work on improving the methods of landmines' detection and liquidation should be considered important. Nowadays most effort should be focused on detecting the most common, nonmetallic landmines. In present study we introduce the new method of landmines' detection: active infrared thermography with microwave excitation, which may be considered complementary to popular metal detector. …In this paper we present numerical models (created using TDFEM method) of microwave heating of chosen systems. The comparison between the numerical and experimental results will be presented as well. Show more

Keywords: Infrared thermography, landmine detection, microwave heating, numerical modelling

DOI: 10.3233/JAE-2011-1393

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 37, no. 2-3, pp. 215-229, 2011

Authors: Lattarulo, Francesco | Amoruso, Vitantonio

Article Type: Research Article

Abstract: The value of the time average Poynting vector P_{ave} in resolving some direct and inverse electromagnetic problems at optical frequencies is claimed. The noticed analogy between P_{ave} and electrostatic field on the surface of a rough object, assumed as a perfect conductor, is fruitfully exploited and the usual Lambert law governing diffuse scattering is re-examined. The given theoretical support is especially recommended to unambiguously resolve, in …computer graphics, the direct object-rendering problem and to deal appropriately, in computer vision, with the inverse object-recovering problem. Show more

Keywords: Electrostatic analogy, Lambert's cosine law, planewaves, rendering, recovering

DOI: 10.3233/JAE-2011-1394

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 37, no. 2-3, pp. 231-240, 2011