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UWB Radio Measurement and Time-Domain Analysis of Anisotropy in Wood Chips
Radarbolaget, Gävle, Sweden.
Radarbolaget, Gävle, Sweden.
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Electronics.ORCID iD: 0000-0003-2887-049x
2018 (English)In: IEEE Sensors Journal, ISSN 1530-437X, E-ISSN 1558-1748, Vol. 18, no 22, p. 9112-9119Article in journal (Refereed) Published
Abstract [en]

Ultra-wideband (UWB) radio transmission measurements have been used to determine the moisture content of wood chips using a time domain technique. Wood chips have been found to have birefringent dielectric properties acting as an anisotropic dielectric effective medium. Birefringence in wood chips occurs because of the orientation and the shape of wood chips, and microscopic structures of these objects, like wood fibers. The birefringence gives rise to two different wavefronts along the principal axes that have different dielectric properties. Each wavefront has a specific time-domain signal, that can be used to determine the moisture content. In industrial applications, for example in measurement on wood chips in trucks, the vertical polarization direction is the preferable polarization because this signal has higher signal-to-noise ratio (SNR), which makes the signal more identifiable at longer distance (2-3 m). Thus, UWB radio transmission measurement and time-domain analysis is a robust technology to investigate larger containers of wood chips and to determine the moisture content with high accuracy.

Place, publisher, year, edition, pages
2018. Vol. 18, no 22, p. 9112-9119
Keywords [en]
anisotropy, birefringence, moisture content, non-destructive testing, radio measurement, Time-domain, transmission measurement, UWB, wood chips, Anisotropic media, Dielectric properties, Moisture, Moisture determination, Nondestructive examination, Polarization, Radio transmission, Signal to noise ratio, Ultra-wideband (UWB), Underwater acoustics, Wavefronts, Wooden containers, Non destructive testing, Radio measurements, Time domain, Transmission measurements, Wood chip, Time domain analysis
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:hig:diva-27964DOI: 10.1109/JSEN.2018.2870760ISI: 000448514000008Scopus ID: 2-s2.0-85053337938OAI: oai:DiVA.org:hig-27964DiVA, id: diva2:1250570
Note

Funding Agencies:

- Forestry Research Institute of Sweden- Swedish Energy Agency- European Commission within the European Regional Development Fund, through the Swedish Agency for Economic and Regional Growth- Region Gävleborg 

Available from: 2018-09-24 Created: 2018-09-24 Last updated: 2018-11-27Bibliographically approved

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Rönnow, Daniel

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