将电介质的复介电常数与其静介电参数、交变电场频率的关系引入Maxwell-Wagner非均质电介质理论,建立湿蒸汽等效复介电常数模型,得到饱和水、干饱和蒸汽和湿蒸汽的复介电常数随波长和温度的变化。饱和水复介电常数的实部随波长增加、温度降低而变大,当波长较大时,实部趋于静介电常数,当波长较小时,实部趋于常数,与温度无关;其虚部随波长增加先变大后减小,随温度降低而变大,当波长较小或较大时,虚部趋于0。干饱和蒸汽复介电常数的实部随波长增加、温度升高而变大,当波长较小或温度较低时,实部趋于1;其虚部随波长增加先变大后减小,随温度升高而变大,当波长较小或较大或温度较低时,虚部趋于0。湿蒸汽的复介电常数和干饱和蒸汽规律相近,当湿度增加时,实部和虚部均变大,而且温度越高,数值越大。 The Maxwell-Wagner heterogeneous dielectric theory is introduced into the relationship between complex dielectric constant of dielectric and its static dielectric constant and alternating electric field frequency to establish the equivalent dielectric constant model of wet steam. Saturated water, dry saturated steam and wet steam The complex dielectric constant with wavelength and temperature changes. The real part of the complex permittivity of saturated water increases with the wavelength and decreases with temperature. When the wavelength is large, the real part tends to the static permittivity. When the wavelength is small, the real part tends to be constant and has no relation with the temperature. The first increases and then decreases with increasing wavelength, and becomes larger with decreasing temperature. When the wavelength is smaller or larger, the imaginary part tends to zero. The real part of the complex permittivity of dry saturated vapor increases with the wavelength and increases with temperature. When the wavelength is small or the temperature is low, the real part tends to 1; the imaginary part increases and then decreases with the wavelength increasing, As the temperature increases and become larger, when the wavelength is smaller or larger or the temperature is lower, the imaginary part tends to 0. The complex permittivity of wet steam is similar to that of dry saturated steam. When the humidity increases, the real part and the imaginary part become larger, and the higher the temperature, the larger the value.