Answers are grounded in this paper and cite their sources.
This paper describes a rapid response microwave hygrometer for continuously recording the water vapor pressure of atmospheric air over a wide ambient range. The principle employed involves the measurement by means of a cavity resonator of the contribution of water vapor to the refractive index of atmospheric air. The device described also has potential application to the continuous measurement of the degree of contamination of one gas (or of gas mixtures) by another gas (or gases).
No takes yet. Share an insight, caveat, or question.
Magee et al. (1958) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: