METHOD OF MEASUREMENT OF LIQUID LEVEL IN VESSEL Russian patent published in 2015 - IPC G01F23/284 

FIELD: measurement equipment.

SUBSTANCE: method of measurement of liquid level in a vessel is offered according to which in a vessel with dielectric liquid the waveguide resonator is vertically placed liquid, the liquid level x in which is equal to its level in the vessel, inaide it electromagnetic oscillations are excited and their resonant frequency is measured. At the resonant frequency f_n(x) electromagnetic oscillations of the type, for which f_n(x) is higher than the critical frequency f_nkp for the wave of this excited type in the wave guide are excited in the whole volume of the resonator, at the value x, lower than some value x1 at which f_n(x₁) is higher than f_nkp, and f_n(x) is measured, and at the value x, higher than x₁ at which f_n(x₁) is lower than f_nkp, in the whole volume of the resonator at the resonant frequency f_k(x) electromagnetic oscillations are excited of the type for which f_k(x) is higher the critical frequency of f_kkp for the wave of this excited type in the wave guide, with change of f_n(x₁) value down to f_k(x₁) value at x=x₁, and f_k(x) is measured. Design data of the resonator can be selected from the condition f_n(x₁)=f_k(x₁).

EFFECT: higher accuracy.

2 cl, 6 dwg