UWB Radio Measurement and Time-Domain Analysis of Anisotropy in Wood Chips

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 o...

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Bibliographic Details
Published in:IEEE sensors journal 2018-11, Vol.18 (22), p.9112-9119
Main Authors: Ottosson, Patrik, Andersson, Daniel, Ronnow, Daniel
Format: Article
Language:English
Subjects:
Anisotropic magnetoresistance
Anisotropic media
Anisotropy
Birefringence
Broadband
Containers
Dielectric measurement
Dielectric properties
Dielectrics
Industrial applications
Intelligent industri
Intelligent Industry
Moisture
Moisture content
Moisture determination
Non destructive testing
Nondestructive examination
Optical fiber polarization
Polarization
Radio
radio measurement
Radio measurements
Radio transmission
Semiconductor device measurement
Signal to noise ratio
Time domain
Time domain analysis
Time measurement
Transmission line measurements
transmission measurement
Transmission measurements
Ultra-wideband (UWB)
Ultrawideband
Underwater acoustics
UWB
Vertical polarization
Wave fronts
Wavefronts
Wood chip
Wood chips
Wood fibers
Wooden containers
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Summary: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, such as wood fibers. The birefringence gives rise to two different wavefronts along the principal axes, which 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, 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.
ISSN:1530-437X
1558-1748
1558-1748
DOI:10.1109/JSEN.2018.2870760