Temperature dependence of dielectric properties of some wood species at low frequency range

Abstract

The effect of temperature on the dielectric properties of some wood species such as Kadam (

Haldina cordifolia), Teak (Tectona grandis L) and Sal tree (Shorea robusta)) wood were investigated at different frequencies from 100Hz to 1MHz along tangential direction. Dielectric constants and dielectric loss factors were measured at temperatures from 30o C to 120°C with variation of frequency showing increase in dielectric constant and dielectric loss with the increase of temperature. Dielectric properties on wood showed a strong relation dependence on the structures, waterâ€Âwood relations, frequency and temperature. A significant variation in dielectric parameters was observed with respect to each species. An abrupt increase in dielectric constant was observed when frequency was less than 1 kHz. The variation in activation energy is observed from one species to other.