177,004 research outputs found
Experimental Reconstructions of Dielectric Targets with Metallic Inclusions by Microwave Imaging
No full textMicrowave imaging of foreign bodies inside wood trunks
No full textThe detection of foreign bodies inside wood trunks is a key task in the wood processing industry. Bullets, screws, or other debris can severely damage carpentry machinery, and, consequently, must be removed prior to processing. In this paper, the feasibility of a new prototype of microwave tomograph for the detection of metallic inclusions inside wood trunks is analyzed. Numerical simulations show that the proposed system configuration is able to acquire data that can be successfully used, in conjunction with a proper inversion procedure, to obtain the distribution of the conductivity of the sample under test, and consequently, to identify the presence of metallic inclusions
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Microwave axial tomograph for medical applications: Preliminary set-up configuration
No full textImaging approaches based on the use of microwaves are acquiring an ever growing importance in several fields. Recently, applications of such approaches to medical imaging, e.g., for breast tumor identification, have also been proposed in the scientific literature. The present Authors are developing a microwave tomograph able to create images of a predefined investigation area by solving the inverse scattering problem which relates the measured electric field data to the dielectric properties of the investigated objects. In the present paper, a description of such system is reported and some advances needed to adapt it for medical imaging are devised by means of numerical simulation involving simplified models
Reconstruction of metallic inclusions inside dielectric targets by means of a microwave tomographic system
No full textExperimental results concerning the inspection at microwave frequencies of wood material with metallic inclusions are reported. They have been obtained by inverting samples of the scattered electromagnetic field collected by a prototype of an imaging system. The system is able to acquire multi-illumination multiview data in a tomographic arrangement. The retrieved maps of the dielectric permittivity and electric conductivity of the cross sections of unknown targets are obtained by applying the distorted-wave Born approximation to the electric field integral equation governing the scattering phenomenon
Electromagnetic imaging of dielectric targets by using a tomographic systems
No full textThe reconstruction of plastic targets by using an electromagnetic imaging system working at microwave frequencies is considered. A prototype of a tomograph is used to measure field scattered data in a multi-illumination multi-view arrangement. The samples of the field are used to retrieve the two-dimensional distributions of the dielectric parameters of the target under test. Experimental results are provided and the overall reconstruction quality is evaluated
Validazione sperimentale di un prototipo di tomografo a microonde per il test non distruttivo di oggetti dielettrici
No full textA multistatic tomographic approach to microwave imaging of dielectric targets
No full textIn the last years, the development of microwave imaging systems, aimed at reconstructing images of the dielectric properties of unknown targets from measures of the scattered field, has been a continuously pursued target. There are mainly two topics that must be faced. First of all, it is necessary to create fast and efficient measurement setups for obtaining the samples of the scattered electric field. Secondly, it is necessary to develop numerical methods able to extract from such measured values the needed information. In this paper, a multistatic measurement setup and an efficient reconstruction procedure are presented. Experimental results are provided in order to demonstrate the effectiveness of the proposed system
Nondestructive Inspection of Wood Materials by a Microwave Imaging Approach – Experimental Results
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