GB1509963A - Devices for determining mass air flow in a conduit - Google Patents

Devices for determining mass air flow in a conduit

Info

Publication number
GB1509963A
GB1509963A GB2154875A GB2154875A GB1509963A GB 1509963 A GB1509963 A GB 1509963A GB 2154875 A GB2154875 A GB 2154875A GB 2154875 A GB2154875 A GB 2154875A GB 1509963 A GB1509963 A GB 1509963A
Authority
GB
United Kingdom
Prior art keywords
pulse
transducer
duct
ultrasonic
airpressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2154875A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fiat SpA
Original Assignee
Fiat SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fiat SpA filed Critical Fiat SpA
Publication of GB1509963A publication Critical patent/GB1509963A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
    • G01F1/667—Arrangements of transducers for ultrasonic flowmeters; Circuits for operating ultrasonic flowmeters

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

1509963 Flowmeter FIAT SpA 20 May 1975 [1 Aug 1974] 21548/75 Heading G1G The mass flow-rate of air in a duct is measured by arranging two Piezo-electric transducers to transmit ultrasonic pulse signals simultaneously towards each other and computing the mass flowrate from the signal propagation times and airpressure data, part of the receiving system for the ultrasonic signals being made inoperative during the pulse transmission. In the embodiment described two Piezo-electric transducers are spaced along the axis of the air duct to avoid vortex generation and are simultaneously pulsed through respective transmit/receive switches. The pulse duration and transducer damping are such that transducer vibrations in response to the pulse die away before the arrival at either transducer of the ultrasonic wavetrain from the other. The two arriving wavetrains pass through respective noise-excluding gates to a circuit which gives an output pulse train of pulse width proportional to the instantaneous air velocity. This pulse train is integrated to give an average velocity signal which is then multiplied by a representation of the airpressure in the duct to obtain a measure of the mass flow-rate.
GB2154875A 1974-08-01 1975-05-20 Devices for determining mass air flow in a conduit Expired GB1509963A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT6943974A IT1016749B (en) 1974-08-01 1974-08-01 ULTRASONIC DEVICE FOR MEASURING THE AIR FLOW IN MAS SA IN A DUCT

Publications (1)

Publication Number Publication Date
GB1509963A true GB1509963A (en) 1978-05-10

Family

ID=11312136

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2154875A Expired GB1509963A (en) 1974-08-01 1975-05-20 Devices for determining mass air flow in a conduit

Country Status (5)

Country Link
JP (1) JPS5137669A (en)
DE (1) DE2527286B2 (en)
FR (1) FR2280884A1 (en)
GB (1) GB1509963A (en)
IT (1) IT1016749B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9335194B2 (en) 2013-09-16 2016-05-10 Agena A/S System or a method for measuring flow of fluid or gas

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2648718C2 (en) * 1976-10-27 1978-12-21 Danfoss A/S, Nordborg (Daenemark) Device that works with ultrasound to determine the physical quantities of a medium
CH604133A5 (en) * 1977-05-10 1978-08-31 Landis & Gyr Ag
DE2953179A1 (en) * 1978-09-29 1980-12-04 Neil Brown Instr Syst Inc ACOUSTIC CURRENT METER
IT1144295B (en) * 1981-07-10 1986-10-29 Fiat Ricerche ULTRASONIC DEVICE FOR MEASURING THE FLOW RATE OF A FLUID IN A DUCT
CA1307605C (en) * 1987-06-23 1992-09-15 Rene Arpin Polymers with imid groups without daimine and process for their preparation
US5221723A (en) * 1987-06-23 1993-06-22 Ciba-Geigy Corporation Thermally stable bisimido copolymerizates
WO1994020822A1 (en) * 1993-03-09 1994-09-15 Commonwealth Scientific And Industrial Research Organisation Fluid meter construction
DE19704001A1 (en) * 1997-02-04 1998-08-06 Herzog Stephan Method for measuring wind speed measurement using ultrasound

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2831348A (en) * 1953-08-14 1958-04-22 Kritz Jack Apparatus for suppressing undesirable modes in ultrasonic flowmeters
US2991650A (en) * 1956-03-07 1961-07-11 Henry S Katzenstein Sonic flow meter
US3050997A (en) * 1958-06-10 1962-08-28 Nat Res Dev Flowmeters
GB1072519A (en) * 1964-11-24 1967-06-21 Decca Ltd Improvements in or relating to speed measuring devices
FR95411E (en) * 1968-02-26 1970-11-06 Realisations Ultrasoniques Sa Ultrasonic flowmeter.
FR2070438A5 (en) * 1969-12-04 1971-09-10 Alais Pierre
US3575049A (en) * 1970-01-08 1971-04-13 Atomic Energy Commission Sonic flow meter
FR2077827A1 (en) * 1970-02-17 1971-11-05 Thomson Csf

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9335194B2 (en) 2013-09-16 2016-05-10 Agena A/S System or a method for measuring flow of fluid or gas

Also Published As

Publication number Publication date
FR2280884B1 (en) 1978-06-09
DE2527286A1 (en) 1976-02-19
DE2527286B2 (en) 1977-12-22
IT1016749B (en) 1977-06-20
FR2280884A1 (en) 1976-02-27
JPS5137669A (en) 1976-03-30

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee