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DC electrical properties of four plantation grown timber species namely Eucalyptus tereticornis, Grevillea robusta, Hevea brasiliensis and Tectona grandis have been measured with respect to moisture content and specific gravity. The effect of grain direction on resistivity and dielectric constant ( at microwave frequency) was also investigated. In case of DC electrical properties, resistivity was found to decrease with moisture content nonlinearly and have a positive correlation with specific gravity. In case of AC electrical properties, dependence of dielectric constant on moisture content has shown a non-linear behaviour for both the grain directions. The variation of dielectric constant parallel to grain has shown a linear behaviour with sp.gr. while it was found to vary non linearly in case of perpendicular to grain direction.

Setup for measuring DC electrical properties of wood            

The dielectric constant in two mutually perpendicular directions (i.e. along and across the grain) of four plantation grown timber species namely Eucalyptus teritecornis,Grevillea robusta , Hevea brasiliensis and Tectona grandis have been measured with varying moisture content at microwave frequency. The dielectric constant has shown a non-linear behaviour with moisture content. The variation of dielectric constant with specific gravity (in the range of 0.55 to 0.72) was found linear in case of parallel to grain directions whereas it showed a non-linear relation in case of perpendicular to grain. The ionization energy have been computed for all the four timber species following Hearle hypothesis and found to vary linearly with moisture content.

Setup for measuring Dielectric properties of wood

                                  

 

 
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  Last Updated on 03-08-2015