FIELD: measuring equipment.
SUBSTANCE: invention can be used to determine the interfaces in a three-component medium, in particular air and two liquids with different densities. Method comprises vertical placing of a long line segment in a tank with a medium, exciting electromagnetic oscillations at its resonant frequency ƒ, its measuring, exciting electromagnetic waves at a fixed frequency, receiving reflected waves, measuring the phase shift Δϕ of excited and received waves and joint functional transformation ƒ and Δϕ. Measuring Δϕ is performed in the same or another identical long line segment with a uniform distribution of the energy of the electric field along it when measuring ƒ and the position of the lower and the upper interfaces are determined according to the difference in values, one of which is proportional, respectively, to the difference between the ratio of the quantity proportional to the value Δϕ in the presence of a medium in the tank to its value in the absence of this medium, and unity, and another quantity - the difference between a quantity proportional to the square of the ratio of the value ƒ in the absence of a medium to its value in the presence of this medium in the tank, and unity.
EFFECT: technical result is wider method functional capabilities.
1 cl, 2 dwg
