Microwave Determination of Water Mole Fraction in Humid Gas Mixtures
作者： R. Cuccaro , R. M. Gavioso , G. Benedetto , D. Madonna Ripa , V. Fernicola
DOI: 10.1007/S10765-011-1007-X
关键词: Frost 、 Hygrometer 、 Water vapor 、 Humidity 、 Materials science 、 Dielectric 、 Microwave 、 Analytical chemistry 、 Mole fraction 、 Dew 、 Condensed matter physics
摘要: A small volume (65 cm3) gold-plated quasi-spherical microwave resonator has been used to measure the water vapor mole fraction x w of H2O/N2 and H2O/air mixtures. This experimental technique exploits high precision achievable in determination cavity resonance frequencies is particularly sensitive presence concentrations as a result polarizability this substance. The mixtures were prepared using INRIM standard humidity generator for frost-point temperatures T fp range between 241 K 270 K commercial two-pressure operated at dew-point temperature 272 K 291 K. measurements compare favorably with calculated molar fractions mixture supplied by generators, showing normalized error lower than 0.8.
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