METHOD OF DETERMINING THICKNESS OF OPTICALLY TRANSPARENT AND TURBID MEDIA Russian patent published in 2020 - IPC G01B11/06 G08B19/02 

FIELD: measurement.

SUBSTANCE: method of determining thicknesses of optically transparent or opaque media consists in location on the level of the surface on which a layer of optically transparent and / or turbid medium is located, two fiber-optic sources of amplitude-modulated monochromatic radiation at different wavelengths of the infrared spectrum and two radiation receivers with two inputs of fiber-optic lines of different diameters. Modulation of radiation sources is carried out by two different non-multiple frequencies, signal received by receivers is generated by synchronous detection. From the obtained signal values at different radiation frequencies for each receiving aperture, ratios of signals are formed, the combination of which determines the thickness of the film.

EFFECT: high accuracy of determining thickness of an optically permeable liquid film on a surface.

1 cl, 3 dwg, 2 tbl