ULTRASONIC METHOD OF DETERMINING FLOW RATE OF GAS MEDIUM AND APPARATUS THEREFOR Russian patent published in 2014 - IPC G01F1/66 

FIELD: physics.

SUBSTANCE: method includes generating ultrasonic vibrations, receiving the ultrasonic vibrations with electroacoustic transducers, measuring the phase difference of electrical oscillations between signals from the electroacoustic transducers and calculating the flow rate from the phase difference. Signals from electroacoustic transducers 1, 2, 3 are transmitted to the input of a phase difference measuring device via a switch depending on control voltage. Electroacoustic transducers 1, 2 are located at ends of a measurement channel and transducer 3 is located at a distance of one wavelength of ultrasound in air; for zero control voltage, a signal is generated from the transducers 2 and 3 and sound speed measurement results are stored; when control voltage assumes a value of one, signals are transmitted through the switch from transducers 1 and 2, and the output of the storage device outputs the stored measurement result of electrical signals obtained at outputs of transducers 2 and 3 and the current phase difference value obtained at the output of transducers 1 and 2; a computing device calculates the instantaneous flow rate of the gas medium.

EFFECT: faster measurement of the flow rate of a gas medium and enabling presentation of results in real-time.

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