FIELD: nondestructive testing. SUBSTANCE: waveguide is made in form of hollow cylinder whose second end face surface is plugged. Installed coaxially and movably is piston with rod. The second converter is attached to piston. Waveguide length is selected from condition l = λ·n, where λ is wave length of excited oscillations in waveguide, and n is integer. EFFECT: extended field of application of device due to measurement of homogeneous mixtures in depth. 4 dwg
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