Inductive salinity sensor for environmental sea water monitoring

by

S.I. Yankovskiy, M.A. Durmanov, I.B. Shirokov

Sevastopol State University, RF, Sevastopol, Universitetskaya St., 33

E-mail: max.durmanov@gmail.com

 

DOI: 10.33075/2220-5861-2023-4-52-57

UDC 502.08                                                              

EDN: https://elibrary.ru/speyxa

Abstract:

The paper focuses on the problem of measuring the salinity of sea water, as one of the main parameters indicating changes in the composition of water, which is necessary for studying the ocean, resource development, monitoring and protecting the environment and preventing its pollution. Methods of salinity measuring are considered. Areometric and refractometric methods have some significant disadvantages, such as low accuracy, low selectivity and low sensitivity, therefore, conductometry is most widely used. When using the considered methods, the disadvantages are eliminated. Conductometry, which includes the inductive method, is based on measuring the electrical conductivity of liquids. When measuring salinity by the conductometric method, the dependence of the electrical conductivity of water on temperature should be considered. Factors influencing changes in water conductivity in reservoirs are also considered. An implementation of a non-contact inductive method for measuring conductivity, in which there is no galvanic contact of the cell electrodes with the analyzed environment is proposed. The operating principle of the inductive salinity sensor is considered and the relationship between the output signal from the sensor and the electrical conductivity of the analyzed liquid is determined. A block diagram of the device is developed. The presence of a microcontroller in the circuit makes it possible to abandon the potential balancing circuit, and also control the generator, keeping constant the frequency values ​​ and the signal voltage. The device is planned to be used as an element of a research probe for monitoring the sea surface using an unmanned surface vehicle.

Keywords: salinity, sensor, inductance, conductivity, measurement, hydrosphere.

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