FIELD: measuring equipment.
SUBSTANCE: invention relates to measuring technology and can be used for high-precision determination of the position of the interface of two liquids located in a tank one above the other and forming a flat interface, in particular two immiscible liquids with different densities, regardless of the electrophysical parameters of both liquids. In the proposed method for determining the position of the interface between two liquids in a tank, in which two identical segments of a coaxial long line filled with liquids are placed vertically in a tank with liquids forming a flat horizontal interface, one above the other, filled with liquids in accordance with their location in the tank, electromagnetic vibrations are excited in the segments of a long line at resonant frequencies ƒ1 and ƒ2,, which correspond to different energy distributions of the electromagnetic field of a standing wave along these segments of a long line, and these resonant frequencies are measured depending on the z coordinate of the interface between two liquids, additionally, electromagnetic waves at a fixed frequency are excited between the parallel outer conductors of the segments of a coaxial long line, as in a segment of a two-wire long line, electromagnetic waves propagated along it and reflected from its lower end of the segment are received at the same end, the phase shift Δϕ of these excited and received electromagnetic waves is measured, electromagnetic oscillations are excited in two segments of a coaxial long line, containing at their lower ends identical parallel horizontal sections of length z0, abruptly filled with liquid when it enters the tank and emptied when the liquid is removed from it, their resonant frequencies ƒ1(z,z0) and ƒ2(z,z0) are measured, and excitation in a segment of a two-wire long line, reception at the upper end of electromagnetic waves propagated along it and reflected from the end of its horizontal section, and a joint functional transformation of ƒ1(z,z0), ƒ2(z,z0) and Δϕ(z,z0) is performed, the result of which does not depend on the values of the electrophysical parameters of both liquids forming the interface.
EFFECT: increased accuracy of determining the position of the interface between two liquids in the tank.
1 cl, 2 dwg
