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Non-destructive methods to detect decay in trees
Institute for Terrestrial Ecology, Soil Physics, Switzerland.
Institute for Terrestrial Ecology, Soil Physics, Switzerland.
2004 (English)In: Wood Research, ISSN 1336-4561, Vol. 49, no 2, p. 17-28Article in journal (Refereed) Published
Abstract [en]

The ability to measure the presence of decay in trees using three different methods is studied. The methods are based on drill resistance, sound wave propagation measurements, and microwave polarimetry. All methods have been tested on samples with artificial cavities as well as on decayed samples. The experiments with both types of samples have showed positive results.

Place, publisher, year, edition, pages
Bratislava: State Forest Products Research Institute , 2004. Vol. 49, no 2, p. 17-28
Keywords [en]
Acoustic wave propagation, Density, Energy absorption, Forestry, Microwaves, Nondestructive examination, Polarimeters, Tomography, Wood, Artifical cavities, Degree of decay, Drill resistance, Microwave polarimetry, Organic Decay, Microwaves, Nondestructive Tests, Polarimetry, Sound Waves, Trees, Wood, Wood Decay
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:hh:diva-4070ISI: 000222854200003Scopus ID: 2-s2.0-14644391611OAI: oai:DiVA.org:hh-4070DiVA, id: diva2:303459
Available from: 2010-03-12 Created: 2010-03-12 Last updated: 2012-06-18Bibliographically approved
In thesis
1. Non-Invasive Multidimensional Imaging Applied on Biological Substances
Open this publication in new window or tab >>Non-Invasive Multidimensional Imaging Applied on Biological Substances
2002 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents the research and development of a microwave in-strument to capture tomographic information from the inner structure ofthe biological sample. The principle of the instrument is based on theanisotropy introduced by the fibres in materials such as wood and musclesin terms of information regarding changes in the fibre structure. The in-formation is presented as images representing the state of polarization us-ing Stokes parameters, the complex polarization ratio, and the ellipticityand the linear tilt angles. The theory of wave propagation in anisotropicmedia is discussed and related to the dielectric properties of wood. Ex-periments have shown that the developed instrument can be utilized invarious applications such as localizing knots and cavities in wood andto detect mechanical contamination of meat. A second instrument hasbeen improved by introducing a new signal analysis step to estimate therelative shrinkage profile of paper. The estimator is based on trackingfrequency variations in the joint time frequency spectrum and follows thelower bound of the problem for the relevant noise levels.

Place, publisher, year, edition, pages
Göteborg: Chalmers university of technology, 2002. p. 154
Series
Doktorsavhandlingar vid Chalmers Tekniska Högskola, Ny serie, ISSN 0346-718X ; 1886
Keywords
Microwave propagation, Tomography, Polarimetry, Frequency estimation, Anisotropic media, Wood, Muscles, Paper
National Category
Natural Sciences
Identifiers
urn:nbn:se:hh:diva-2461 (URN)2082/2863 (Local ID)91-7291-204-9 (ISBN)2082/2863 (Archive number)2082/2863 (OAI)
Public defence
(English)
Note
[Paper A] Kaestner, A.P. & Bååth, L.B., Microwave polarimetry based scanning for internal defects, Submitted to IEEE Transactions on Antennas and Propagation.Available from: 2009-04-16 Created: 2009-04-16 Last updated: 2010-03-12Bibliographically approved

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