【摘要】 为了描述木材—吸附水系统的复数介电系数（ε^*）随频率（f）、含水率（φ）的变化关系,本文应用Wagner理论,假定介电弛豫时间分布函数呈Gauss型概率分布形式,得到了复数介电系数（ε^*）的表达式,以及分布参数（n）同温度（T）、含水率（φ）之间的关系,并对介电系数（ε′）、介电损耗（ε″）的计算值和实测值作了比较。结果表明:在描述木材—吸附水系统的复数介电系数方面,Wagner理论比Fr（?）hlich理论更理想;在平均弛豫时间（τ₀）的近域内,Wagner理论和Fr（?）hlich理论两者等同;在描述介电弛豫时间分布随含水率（φ）变化方面,Cole—Cole理论中参数（β）、Fr（?）hlich理论中参数(v₀/kT、Wagner理论中参数（n）三者等同。更多还原

【Abstract】 By applying wagner’s theory, the relationship between the complex dielectric con stant（ε（?））, the frequency （f） and the moisture content（ψ）of wood-absorptive water sys tem was given in the paper. According to Wagner’s theory, it is assumed that the distri bution function of relaxation time is governed by Gauss probability function. The relationship of the parameter n of relaxation time in the distribution with respect to moisture content ψand temperature T formulated respectively in this study. The calculated values of the dielectric constant ε′and the loss factor ε〃were compared with those measured. The results showed that Wagner’s theory was more accurate than Frhlich’s. Within the near domain of the average relaxation time τ₀, Wagner’s theory was consist with Frhlich’s theory. In regard to the change of the distribution of dielectric relaxation time with moisture content ψ, the parameters βin Cole-Cole’s theory, ν₀ /KT in Frhlich’s theory and n in Wagner’s theory were also the same.更多还原