METHOD AND DEVICE FOR MEASURING FLOW RATE OF LIQUID OR GAS Russian patent published in 1995 - IPC

FIELD: measurement of flow rates of liquids and gases. SUBSTANCE: method consists in shaping the signals of ultrasonic frequency by and counter flow at different aliquant frequencies, modulating the signals thus shaped by frequency in proportion with time of their propagation, measuring the difference of time of propagation by separating the modulated components, mixing them and separating the difference signal of beating and determining the flow rate. Device for realization of this method has two self-excited oscillators 1 and 2, two amplifiers 3 and 4, two acoustic radiators U₁ and U₂, two acoustic receivers F₁ and F₂, axle of pipe 5, two preamplifiers 6 and 7, two synchronizing detectors 8 and 9, two modulators 10 and 11, mixer 12, two amplifiers 13 and 15, detector 14 and recording unit 16. EFFECT: enhanced efficiency. 3 cl, 2 dwg