Utilizing wave polarization in microwave characterization of heterogeneous anisotropic materials with application to the wood industry

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Authors
Bogosanovic, Mirjana
Emms, G.W.
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Date
2014-09
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Conference Contribution - Paper in Published Proceedings
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Keyword
wood
free-space transmission measurement
non-destructive testing
microwave
polarization
heterogeneous media
moisture content of wood
density
Citation
Bogosanovic, M., and Emms, G. (2014) Utilizing wave polarization in microwave characterization of heterogeneous anisotropic materials with application to the wood industry. Proceedings of the 8th International Conference on Sensing Technology (Ed.), Liverpool, UK. (614-619)
Abstract
This paper presents a novel approach to microwave non-contact, non-destructive testing of wood, investigating additional indicators of wood structure, in particular the significance of wave polarization in transmission measurements. Contribution of wave polarization to wood characterization is studied, considering detection of rapid and gradual variations in wood structure, determination of moisture content and density distribution along the sample, as well as bulk properties detection. A set of microwave sensors in a collinear arrangement was used in two orthogonal linear polarizations. Significant findings are reported, in particular polarization dependence of moisture related attenuation, as well as improved defect detection accuracy when measurements in two orthogonal linear polarizations are considered. In addition, sorting wood samples into categories is considered and the advantages of this approach are presented.
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International Conference on Sensing Technology
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