CALIBRATION-FREE RADIOMETRIC METHOD OF MEASURING COMPLEX DIELECTRIC PERMEABILITY FROM SEPARATION SURFACE REFLECTION IN AN ANECHOIC CHAMBER Russian patent published in 2020 - IPC G01R27/26 

FIELD: measuring equipment.

SUBSTANCE: invention can be used for measuring complex dielectric permittivity of a substance. Essence of the invention is that a radiometric method of measuring complex dielectric permeability of an ε substance by measuring reflection coefficients R_p at given polarizations of radiation p at two or more angles of incidence on the surface of the substance and calculating ε by Fresnel equations, wherein measurements are taken in anechoic chamber at temperature T₀ equal to temperature of measured substance T_S, radiometer signal U₀ is measured when orientation of its axis of beam pattern on walls of anechoic chamber, radiometer measured signal U_per in the orientation of its axis of the radiation pattern directly on the orientation axis of the chart emitter (having a brightness temperature greater than T₀)_, measured signal U_ref radiometer, after reflection from the surface of the radiation emitter substance at a predetermined angle of incidence θ and at the same distance from an imaginary radiometer to the emitter of the image as in the measurement of U_per and reflection coefficient R_p(θ) is calculated without absolute calibration of radiometer according to said formula, in open space by measuring reflection coefficients from surface of substance and using Fresnel equations.

EFFECT: increased accuracy of measurements is provided.

1 cl, 3 dwg