Microwave Cavity Sensor for Measurements of Air Humidity under Reduced Pressure
Author:
Galka Alexander Georgievich1ORCID,
Kostrov Alexander Vladimirovich1,
Priver Stanislav Eduardovich1,
Strikovskiy Askold Vitalievich1,
Parshin Vladimir Vladimirovich1,
Serov Evgeny Alexandrovich1ORCID,
Nikolenko Andrey Sergeevich1,
Korobkov Sergey Vladimirovich1,
Gushchin Mikhail Evgenievich1ORCID
Affiliation:
1. Federal Research Center Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod 603950, Russia
Abstract
A high-sensitivity sensor for measuring moisture content in the air or air humidity under low pressure was designed on the basis of a half-wave coaxial microwave cavity. The method of measuring small variations in the signal phase at a cavity excitation frequency of 1.63 GHz was applied to detect low densities of water vapor. It allows the detection of variations in dielectric air permittivity in the seventh decimal place. A prototype of the sensor was tested in a vacuum chamber. It was calibrated by comparing the test results with the readings of a commercial pressure gauge and using the independent method of measuring the moisture content in rarefied air on the basis of the absorption of millimeter waves in the local line of water vapor at 183 GHz. The developed sensor can be used in laboratory experiments and full-scale geophysical research in the atmosphere onboard various aircrafts.
Funder
the Ministry of Science and Higher Education of the Russian Federation
Laboratory of Microwave Research of Materials and Substances
Subject
Electrical and Electronic Engineering,Biochemistry,Instrumentation,Atomic and Molecular Physics, and Optics,Analytical Chemistry
Reference39 articles.
1. Ruskin, R.E., and Wexler, A. (1965). Humidity and Moisture. Measurements and Control in Science and Industry, Vol. 1, Principles and Methods of Measuring Humidity in Gases, Reinhold Publishing Corp.
2. Association, adsorption, and dielectric constant;Zahn;Phys. Rev.,1926
3. Recording microwave hygrometer;Magee;Rev. Sci. Instrum.,1958
4. Automatic digital microwave hygrometer;Hasegawa;Rev. Sci. Instrum.,1975
5. The dielectric constant of several gases at a wave-length of 3.2 centimeters;Crain;Phys. Rev.,1948
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