Empress Catherine II Saint-Petersburg Mining University, Saint-Petersburg, Russia

A. A. Korzhev, Candidate of Engineering Sciences, Associate Professor
V. I. Malarev, Candidate of Engineering Sciences, Associate Professor
T. E. Minakova, Candidate of Engineering Sciences, Associate Professor, Minakova_TE@pers.spmi.ru

The dielcometric method of measuring humidity is described, with a moist environment representing the sensitive element of a dielectric sensor. To determine the most appropriate circuits for the preset requirements, it is proposed to use a calibration curve in a wide frequency range. Based on the results of the preliminary analysis, the circuits of the highest operational reliability and operability at a low tuned-circuit Q-factor were determined. The article presents the experimental studies of the high-frequency measuring self-oscillator circuits intended for use in a dielectrometric humidity meter. The comparative analysis of the main types of sensors is performed, and the calibration curves of the generators under consideration are given. From the obtained calibration curve, it can be seen that the studied generator circuit is operable in the range from 0 to 0.3 units of bulk humidity, and works stably and without disrupting vibrations in the entire measurement range. Based on the analysis, an original circuit of a measuring self-oscillator for a dielectric humidity meter is proposed, as well as a technical implementation of the proposed humidity sensor based on a vertical coplanar cell of a scattered field is presented. As a result of the studies, it is concluded that it is advisable to use this sensor to monitor moisture content of crude oil in oil wells, as well as in other mineral mines if moisture control is necessary. The proposed circuit provides operation in a wide capacitance range with a nearly linear calibration curve, and is also operable in the range from 0 to 0.3 volume units, which is sufficient for rapid humidity testing in the oil field conditions, for instance, during separation of crude oil.

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