GB2021768A - Acoustic measuring instruments eg flowmeters or level gauges - Google Patents

Acoustic measuring instruments eg flowmeters or level gauges

Info

Publication number
GB2021768A
GB2021768A GB7916836A GB7916836A GB2021768A GB 2021768 A GB2021768 A GB 2021768A GB 7916836 A GB7916836 A GB 7916836A GB 7916836 A GB7916836 A GB 7916836A GB 2021768 A GB2021768 A GB 2021768A
Authority
GB
United Kingdom
Prior art keywords
acoustic wave
signal
pulse
receiver
time
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.)
Granted
Application number
GB7916836A
Other versions
GB2021768B (en
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.)
Fuji Electric Co Ltd
Ultrasonic Engineering Co Ltd
Original Assignee
Fuji Electric Co Ltd
Ultrasonic Engineering Co Ltd
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 Fuji Electric Co Ltd, Ultrasonic Engineering Co Ltd filed Critical Fuji Electric Co Ltd
Publication of GB2021768A publication Critical patent/GB2021768A/en
Application granted granted Critical
Publication of GB2021768B publication Critical patent/GB2021768B/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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/296—Acoustic waves
    • G01F23/2962—Measuring transit time of reflected waves

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Thermal Sciences (AREA)
  • Measuring Volume Flow (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Measurement Of Unknown Time Intervals (AREA)

Abstract

An acoustic wave travels from transducers 8 along path I to receiver 9. A counter 5 supplied by controllable oscillator 1 is made to count to a predetermined count repetitively to produce signal W, and the time difference between the production of signal W and the arrival of the acoustic wave at receiver 9 (signal Z) is determined at 7, and is used to control the frequency of oscillator 1 to make the count time of counter equal to the acoustic wave transit time t whereby the frequency of oscillator 1 provides a measure of the transit time. A circuit 13 generates a pulse of predetermined width a predetermined time after signal W starts. The output t + tau of receiver 4 which detects the arrival of the acoustic wave is compared with this pulse to provide a degree of abnormality detection. If the output t + tau occurs outside this pulse, the propagation of the acoustic wave is regarded as abnormal. <IMAGE>
GB7916836A 1978-05-16 1979-05-15 Acoustic measuring instruments eg flowmeters or level gauges Expired GB2021768B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5782178A JPS54149670A (en) 1978-05-16 1978-05-16 Circuit device for detecting ultrasonic wave propagating time

Publications (2)

Publication Number Publication Date
GB2021768A true GB2021768A (en) 1979-12-05
GB2021768B GB2021768B (en) 1982-08-18

Family

ID=13066575

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7916836A Expired GB2021768B (en) 1978-05-16 1979-05-15 Acoustic measuring instruments eg flowmeters or level gauges

Country Status (6)

Country Link
JP (1) JPS54149670A (en)
DE (1) DE2920177A1 (en)
DK (1) DK200579A (en)
FR (1) FR2426248A1 (en)
GB (1) GB2021768B (en)
NL (1) NL7903821A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5359897A (en) * 1989-08-08 1994-11-01 Front Engineering Ltd. Apparatus for determining the time taken for sound energy to cross a body of fluid in a pipe

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5752815A (en) * 1980-09-16 1982-03-29 Yokogawa Hokushin Electric Corp Processing circuit for ultrasonic wave signal
JPS5827086A (en) * 1981-08-11 1983-02-17 Fuji Electric Co Ltd Ultrasonic wave propagation time detector
DE3316630C2 (en) * 1983-05-06 1985-07-25 Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch Device for determining the transit time of ultrasonic pulses in a fluid
JPH0749976B2 (en) * 1986-02-26 1995-05-31 富士電機株式会社 Ultrasonic measuring device
JP4538163B2 (en) * 2001-03-30 2010-09-08 サーパス工業株式会社 Flow rate measuring method, flow rate measuring device, flow rate measuring method, and flow rate measuring device

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894431A (en) * 1972-04-04 1975-07-15 Atomic Energy Authority Uk Apparatus for indicating fluid flow velocity
US3818757A (en) * 1972-05-05 1974-06-25 Saratoga Sys Inc Dual path ultrasonic fluid flow metering system and method
JPS49130261A (en) * 1973-04-13 1974-12-13
JPS5310454A (en) * 1976-07-16 1978-01-30 Nippon Kokan Kk Apparatus for detecting change of fluid character by singgaround method
DE2641771A1 (en) * 1976-09-14 1978-03-16 Fuji Electric Co Ltd Time difference measuring device - compares measured time difference and reference value for ultrasonic velocimeter
DE2641772A1 (en) * 1976-09-14 1978-03-16 Fuji Electric Co Ltd Throughflow or current measuring instrument - has time-difference measuring instrument detecting oscillator pulses and further pulses
JPS5829854B2 (en) * 1977-07-26 1983-06-25 富士電機株式会社 Ultrasonic measuring device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5359897A (en) * 1989-08-08 1994-11-01 Front Engineering Ltd. Apparatus for determining the time taken for sound energy to cross a body of fluid in a pipe

Also Published As

Publication number Publication date
JPS54149670A (en) 1979-11-24
DK200579A (en) 1979-11-17
GB2021768B (en) 1982-08-18
NL7903821A (en) 1979-11-20
DE2920177A1 (en) 1979-11-22
FR2426248A1 (en) 1979-12-14

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee