Über das Verhalten des dielektrischen Verlustfaktors von Naturholz im großen Frequenzbereich

The former research on the dielectric anisotropy of wood in the frequency range of 3x10^2...10^9 cps has been extended by the measurement of the dielectric losses. The anisotropy originates in the macroscopical structure; the maximum of the loss-factor tg[delta] at rather high frequencies is explained by the dipole-character of cellulose. The effect of water contained in the wood on the dielectric properties at higher frequencies is explained by the influence which the water molecules exercise on the vibration of the dipolegroups of the cellulose. At low frequencies the influence of moisture comes from the inhomogenity corresponding to Wagner's theory of dielectric losses