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Measurement of Interface Position between Substances in a Tank by Radiofrequency Techniques

Radiofrequency method for measurement of interface position between two substances that are liquids with different densities in particular, located in a tank one above the other is considered. Measurement results are independent on electromagnetic parameters of both one and two substances. The method is realized via application of two or three TEM transmission line sections correspondingly and joint functional processing of their resonant frequencies. The line sections have horizontal parts at their lower ends.