- Title
- Microwave characterization of typical Australian wood-based biomass materials
- Creator
- Ramasamy, Shanmuganathan; Moghtaderi, Behdad
- Relation
- 35th Annual Review of Progress in Quantitative Nondestructive Evaluation, 2008. Proceedings of the 35th Annual Review of Progress in Quantitative Nondestructive Evaluation 2008, Volume 28B (Chicago, IL 20-25 July, 2008) p. 1558-1565
- Publisher Link
- http://dx.doi.org/10.1063/1.3114143
- Publisher
- American Institute of Physics
- Resource Type
- conference paper
- Date
- 2009
- Description
- Many applications of microwave energy to wood-based materials require a reliable estimation of permittivity, which is the physical parameter of crucial importance in the absorption of electromagnetic energy. Wood-based materials are of significant importance in a number of application areas particularly in: (i) power generation, (ii) fire safety, and (iii) manufacturing. In the present study, dielectric measurements were carried out for typical Australian wood species such as slash pine (Pinus elliottii, soft wood), and spotted gum (Eucalyptus maculata, hard wood), based on Von Hippel's transmission line method. The influence of extractive removal is also studied and compared with the virgin wood samples. Measurements were performed at 9.5 GHz for virgin wood samples and extractive-free wood samples. Experiments were carried out at room temperatures and atmospheric pressure. The dielectric properties of wood species were determined for three principle structural directions, (i.e. longitudinal tangential and radial) and different moisture contents. Moisture content varied from 0% to 15% for virgin wood samples and from 3 - 6.6 % for extractive-free wood samples at atmospheric equilibrium condition. Results indicated that for both wood species the dielectric constant was affected by moisture content, structural direction and density. The dielectric properties of both wood species were found to be quantitatively similar. In general, for virgin wood samples the dielectric constant was found to increase with moisture content and density. The values of dielectric constant in the longitudinal direction were generally higher than those in the transverse direction for both types of wood species. An abnormal trend was obtained for extractive - free wood samples.
- Subject
- dielectric constant; hardwood; softwood and microwave
- Identifier
- http://hdl.handle.net/1959.13/919107
- Identifier
- uon:8775
- Identifier
- ISBN:9780735406292
- Identifier
- ISSN:0743-0760
- Language
- eng
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