Ultrasonic current and flow meter utilizing doppler's shift

Abstract

PURPOSE:To enable measurement of current velocity of fluid having high pollution concentration by measuring the current velocity of the fluid to be measured in the vicinity of a tubular wall by utilizing the Doppler's shift of an ultrasonic signal reflected from solid particles passing the vicinity of the wall of a conduit. CONSTITUTION:Ultrasonic wave is generated from a transmission transducer 2, and this ultrasonic wave signal is transmitted in a beam having an axis 7 crossing at an angle alpha with respect to the central axis 6 of a conduit 4 through a plastic wedge 3. The ultrasonic wave signal thus transmitted collides with solid particles 8 passing the vicinity of the tubular wall of the conduit 4, and is partially received by a receiving transducer 11 upon reflection. The received signal is applied through a mixer 12, a low pass filter 13, a frequency discriminator 14 to a correcting unit 15 to become an output voltage representing the mean current velocity.

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Cited By (7)

    Publication numberPublication dateAssigneeTitle
    DE-4118810-A1December 10, 1992Georg F WagnerVorrichtung zur messung kleiner partikel in einem messrohr stroemenden medium
    EP-0517140-A2December 09, 1992Wagner, LouiseApparatus for measuring small fluid and particle flow
    GB-2399879-ASeptember 29, 2004Otsuka Denshi KkElectrophoretic mobility measuring apparatus
    GB-2399879-BFebruary 15, 2006Otsuka Denshi KkElectrophoretic mobility measuring apparatus
    JP-S57147013-ASeptember 10, 1982Hitachi LtdUltrasonic doppler flow meter
    US-4545244-AOctober 08, 1985Ebara CorporationUltrasonic flow meter
    US-7449097-B2November 11, 2008Otsuka Electronics Co., Ltd.Electrophoretic mobility measuring apparatus