Method of controlling physical characteristics of fluid medium

Abstract

A method of controlling physical characteristics of a fluid medium by transmitting ultrasonic vibrations to the medium under control through a sound conducting medium and through a pipe wall at an angle .alpha., acute or obtuse, to the pipe exterior, said angle being determined by the relationship: .alpha. = arcsin C.sub.o /(.sqroot.2.multidot.C) where: C.sub.o is the velocity of propagation of ultrasonic vibrations in the sound conducting medium; and C is the velocity of propagation of transverse ultrasonic vibrations in the material of the pipe wall. Therewith, the frequency f of the ultrasonic vibrations being transmitted is selected according to the relationship: f = (n .multidot. C)/(.sqroot.2 .multidot. d) where: n is an integer (such as 1, 2 or 3); and d is the thickness of the pipe wall. Parameters of the ultrasonic vibrations, passed through the medium under control, are then measured and their value is used to determine the value of a parameter being controlled. The herein proposed method makes it possible to increase the accuracy of controlling physical characteristics of a fluid medium.

Dependencies are inferred from the claim text.