UDC 621.396.96
LEVEL MEASUREMENT ERROR BY FREQUENCY-MODULATED LEVEL GAUGE WITH IRREGULAR WAVE GUIDE
B. A. Atajants, Ph.D. (Tech.), deputy the general director, chief designer, LTD enterprise «Kontakt-1», Ryazan, Russia;
orcid.org/0009-0002-3317-3897, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
V. M. Davydochkin, Dr. Sc. (Tech.), head of the department of microwave oven devices and antennas, LTD «KONTAKT-1» enterprise, Ryazan, Russia;
orcid.org/0009-0009-5232-7527, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
V. V. Ezerskiy, Dr. Sc. (Tech.), full professor, professor of the department of radio control and communication, Ryazan state radio engineering university, leading expert of special design bureau, LTD «Kontakt-1» enterprise, Ryazan, Russia;
orcid.org/0000-0002-6077-752X, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
The problem of measuring the level of filling the tank with liquid substance by means of waveguide frequency-modulated level gauge is considered. The level estimation error is considered to be caused by dispersion of electromagnetic waves in a waveguide and is easily eliminated by introducing the predistortions to the law of frequency modulation. Additional error arises when using an irregular waveguide. The irregularity is caused by the need to use a compound waveguide when heterogeneity of properties of the pieces used is observed. The aim of the work is to estimate possible measurement error caused by piecewise heterogeneity of a waveguide and to develop a method allowing us to make this error significantly lower. Error estimation caused by waveguide irregularity at practical realization of a waveguide level gauge is made. The method of reducing the error by using individual calibration parameters for each site of quasiuniformity is offered. The technique of practical determination of individual parameters is offered. Quantitative assessment of reached effect is carried out.
Key words: : frequency-modulated level gauge, irregular waveguide, unevenness of characteristics, level measurement error, individual calibration parameters, error reduction.