Microwave measurement of water salinity

by

D.A. Poletaev, B.V. Sokolenko

V.I. Vernadsky Crimea Federal University,

RF, Simferopol, Vernadsky Av., 4

E-mail: poletaevda@cfuv.ru

DOI: 10.33075/2220-5861-2023-4-58-64

UDC 621.317                                                           

EDN: https://elibrary.ru/speyxa

Abstract:

In this paper the process of optimizing the geometry of a resonant transducer for improving sensitivity and its application for measuring water salinity are described. Microwave diagnostic methods are widely used in science, technology and national economy. The widespread use of equipment based on these methods is due to the indestructibility of the sample, the absence of physical contact, and the possibility of obtaining express data during research. The main functional unit of the equipment for microwave diagnostics of materials is a sensor, which includes a source of electromagnetic waves, a measuring transducer and devices for allocation of information signals (resonant frequency, quality factor and their changes for a specific resonant measuring transducer). The purpose of the work is to optimize the parameters of a resonant measuring transducer used for measuring the salinity of the aquatic environment, as well as to describe the principle of operation of this device and its testing. A theoretical description of the experimental methodology is provided. Its capabilities are analyzed. Theoretical and practical calibration of the developed device is carried out. An unambiguous correspondence between salinity and information signals is established.

A set of practical measurements of prepared water samples is carried out. According to estimates, the measurement time is no more than 100 μs. A conclusion is made about the possibility of using the developed sensor in a complex of automatic flow meters that monitor water salinity in real time. As a result of modeling and experimental testing, it is established that the developed device is characterized by rapidity.

Keywords: microwave, resonator, volume, frequency, sensor, aperture, waveguide.

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