ULTRASONIC PHASE-SHIFT METHOD FOR MEASURING FLOWRATE OF MEDIUM (ALTERNATIVES) Russian patent published in 2004 - IPC

FIELD: fluid medium flow metering technology using ultrasonic transducers.

SUBSTANCE: two different phase-shift methods are proposed for flow metering, each of them ensuring flow metering in any direction of medium and for direct measurement of ultrasound velocity in medium at the same time measuring phase shift and controlling temperature in the course of measurements. First proposed method is ultrasonic phase-shift method for measuring fluid media flow that depends on radiation of single-frequency ultrasonic vibrations in the form of sounding pulses by first and second convertible electroacoustic transducers in uniflow and counter-flow opposing directions simultaneously; reception of mentioned opposing vibrations by electroacoustic transducers; limiting of amplitude and phase detection of received pulses; and integration of pulse area. Zero value of flow is set by respective pulse area in absence of flow. Current flow is evaluated by measuring phase shift between vibrations received in uniflow and counter-flow direction and by measuring rate of ultrasound propagation in given medium; ultrasonic vibrations excited in first and second electroacoustic transducers are relatively shifted in phase in advance. Second proposed method includes evaluation of ultrasound velocity for calculating medium flow by pulse-time method using radiations of convertible electroacoustic transducers used for phase-shift measurement method; in the process propagation time of sounding pulses is measured between their radiation and reception at the same time measuring phase shift between radiation periods of electroacoustic transducers.

EFFECT: enlarged functional capabilities.

4 cl, 5 dwg