Microwave tomography for the inspection of wood materials: Imaging system and experimental results
| Autor: | Andrea Sansalone, Ricardo Monleone, Andrea Randazzo, Manuela Maffongelli, Alessandro Fedeli, Andrea Salvade, Matteo Lanini, Matteo Pastorino, Federico Boero |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Computer science
Acoustics 0211 other engineering and technologies Inverse transform sampling 02 engineering and technology Dielectric tomography Antenna measurements Imaging Microwave antennas Microwave imaging Microwave theory and techniques 0202 electrical engineering electronic engineering information engineering Prototypes Electrical and Electronic Engineering 021101 geological & geomatics engineering Vegetation Radiation Tree trunk 020206 networking & telecommunications Inversion (meteorology) microwave systems inverse scattering Condensed Matter Physics wood Microwave Microwave tomography |
| Popis: | A new microwave tomography prototype for the inspection of wood materials is described and experimentally tested in this paper. The system prototype is composed by a set of microwave antennas, used for both illuminating the sample and collecting field measurements, a custom RF hardware, and a hybrid tomographic inversion scheme. The antennas are placed in contact with the outer structure of the sample, e.g., a tree trunk, and are optimized to radiate inside the inspected region. A switching matrix connects the set of antennas with a custom vector network analyzer, which is used for acquiring multistatic and multiview field measurements at multiple frequencies. The measured data are processed by means of a combined qualitative/quantitative inversion method. In particular, in a first step, the field scattered by the inner inhomogeneities or inclusions is estimated, producing also a qualitative image of the sample. Then, these data are utilized by a deterministic inversion algorithm in order to obtain a quantitative reconstruction of the dielectric properties of the structure under test. |
| Databáze: | OpenAIRE |
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