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Measurement of the Dielectric Properties of Sawdust Between 0.5 and 15 GHz
Mälardalen University, School of Sustainable Development of Society and Technology. (MERO)
ARS, USDA, Richard B Russell Agr Res Ctr, Athens, GA 30605 USA.
ARS, USDA, Richard B Russell Agr Res Ctr, Athens, GA 30605 USA.
Mälardalen University, School of Sustainable Development of Society and Technology.ORCID iD: 0000-0002-3485-5440
2011 (English)In: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, Vol. 60, no 10, 3384-3390 p.Article in journal (Refereed) Published
Abstract [en]

The aim of this paper was to measure the broadband dielectric properties of sawdust. Knowledge of dielectric properties is important in improving understanding of a material and can lead to the development of methods for determining physical properties such as moisture and salt content. The broadband dielectric properties of sawdust were measured with an open-ended coaxial-line dielectric probe. Measurements on granular materials with the dielectric probe are dependent on the density of the measured region, which may differ from the average density of the sample. In this paper, a method was developed for determining the actual density for measurements with the dielectric probe. It consists of measurement of the dielectric constant with a different method (in this instance, a free-space transmission method) at a frequency common to both methods and identifying a relationship between the measured dielectric constant and density. The dielectric properties of sawdust samples with moisture content levels between 13% and 45% are presented for frequencies between 0.5 and 15 GHz.

Place, publisher, year, edition, pages
2011. Vol. 60, no 10, 3384-3390 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:mdh:diva-10415DOI: 10.1109/TIM.2011.2128510ISI: 000294864700017Scopus ID: 2-s2.0-80052855747OAI: oai:DiVA.org:mdh-10415DiVA: diva2:356709
Available from: 2010-10-13 Created: 2010-10-13 Last updated: 2013-12-04Bibliographically approved
In thesis
1. The dielectric properties of solid biofuels
Open this publication in new window or tab >>The dielectric properties of solid biofuels
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The use of bioenergy has been increasing due to efforts in fossil fuels replacement. Modern bioenergy technologies aim for high efficiency and low pollution levels, which increases the need for methods for the on-line characterization of biofuels.

Dielectric methods have been identified as useful for the sensing of solid biofuels because they allow for rapid, nonhazardous, nondestructive, and bulk determination of material properties. The dielectric properties describe the interaction between the material and the electromagnetic waves. Dielectric properties are intrinsic of the materials and can therefore be used for the development of prediction models that can be applied regardless of the measurement technique. The study of the dielectric properties is also important as it improves the understanding of the dielectric behavior of the materials.

This thesis focuses on the dielectric properties of solid biofuels and their use in the characterization of these materials. The work presented includes the development of new methods permitting the determination of the dielectric properties of solid biofuels with large particle size (waveguide method), broadband measurement of the dielectric properties (coaxial-line probe), and the use of a previously developed method for the accurate determination of the dielectric properties (free-space method). The results includes the dielectric properties of solid biofuels and their dependence on parameters such as frequency, moisture, density, and temperature.

This thesis also presents semi-theoretical models for the determination of moisture content, which obtained a RMSEP of 4% for moisture contents between 34 and 67%, and an empirical model that resulted in a RMSEC of 0.3% for moisture contents between 4 and 13%.

Finally, this thesis includes measurements of the influence of salt content on the dielectric properties and a discussion of its use for estimation of the ash content of solid biofuels.



Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2010. 64 p.
Series
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 90
Keyword
dielectric properties, solid biofuels, moisture content determination
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-10500 (URN)978-91-86135-94-2 (ISBN)
Public defence
2010-11-26, Lambda, Mälardalens högskola, Västerås, 10:00 (English)
Opponent
Supervisors
Available from: 2010-11-11 Created: 2010-10-22 Last updated: 2010-11-11Bibliographically approved

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