GB1551742A - Circuits for defining pulse occurrence times in wave forms of predetermined frequency - Google Patents

Circuits for defining pulse occurrence times in wave forms of predetermined frequency

Info

Publication number
GB1551742A
GB1551742A GB27939/76A GB2793976A GB1551742A GB 1551742 A GB1551742 A GB 1551742A GB 27939/76 A GB27939/76 A GB 27939/76A GB 2793976 A GB2793976 A GB 2793976A GB 1551742 A GB1551742 A GB 1551742A
Authority
GB
United Kingdom
Prior art keywords
signal
arrival
square
ultrasonic
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.)
Expired
Application number
GB27939/76A
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.)
Danfoss AS
Original Assignee
Danfoss AS
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
Priority claimed from DE19752530114 external-priority patent/DE2530114C2/en
Application filed by Danfoss AS filed Critical Danfoss AS
Publication of GB1551742A publication Critical patent/GB1551742A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
    • G01P5/24—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave
    • G01P5/245—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave by measuring transit time of acoustical waves
    • 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)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Multimedia (AREA)
  • Acoustics & Sound (AREA)
  • Fluid Mechanics (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Measuring Volume Flow (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Reverberation, Karaoke And Other Acoustics (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
  • Percussion Or Vibration Massage (AREA)

Abstract

In order to obtain an accurate value of the propagation time of the ultrasonic signal, the arrival of the high-frequency ultrasonic vibration train (S8) at the receiver must be established very accurately. Since the amplitude of the received signal (S8) rises starting from zero, the start of the same is not precisely defined. Consequently, a delayed instant at which the received vibration is at approximately the maximum amplitude is chosen for establishing the accurate arrival time. For this purpose, the ultrasonic signal is used to derive an electric square-wave signal (S12) which is synchronous with said ultrasonic signal, and said square-wave signal is compared in a phase detector (15) with a signal (S14) which is delayed with respect to the start of the vibration train (S8). The signal delivered by the phase detector alters the arrival delay time in such a way that the delay signal coincides precisely with a specific edge of a pulse of the square-wave signal (S12). As a result, the arrival time is accurately defined and the propagation time of the signal can be determined by means of known methods, e.g. counting the pulses of a clock pulse sequence. <IMAGE>
GB27939/76A 1975-07-05 1976-07-05 Circuits for defining pulse occurrence times in wave forms of predetermined frequency Expired GB1551742A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19752530114 DE2530114C2 (en) 1975-07-05 Circuit arrangement for determining physical quantities of flowing media, in particular the flow velocity, according to the ultrasonic method

Publications (1)

Publication Number Publication Date
GB1551742A true GB1551742A (en) 1979-08-30

Family

ID=5950777

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27939/76A Expired GB1551742A (en) 1975-07-05 1976-07-05 Circuits for defining pulse occurrence times in wave forms of predetermined frequency

Country Status (9)

Country Link
JP (1) JPS5836728B2 (en)
CH (1) CH612764A5 (en)
DK (1) DK302676A (en)
FR (1) FR2317657A1 (en)
GB (1) GB1551742A (en)
IT (1) IT1071228B (en)
NL (1) NL185102C (en)
NO (1) NO142687C (en)
SE (1) SE407859B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011134470A3 (en) * 2010-04-28 2012-08-16 Miitors Aps Ultrasonic flow meter

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57168115A (en) * 1981-04-10 1982-10-16 Toshiba Corp Ultrasonic wave flow speed measuring device
JPS60193538A (en) * 1984-03-09 1985-10-02 Res Dev Corp Of Japan Adsorbent
JPS6125639A (en) * 1984-07-13 1986-02-04 Res Dev Corp Of Japan Adsorbent
JPS6238238A (en) * 1985-08-14 1987-02-19 Res Dev Corp Of Japan Adsorbent
JPH06197B2 (en) * 1990-07-16 1994-01-05 新技術事業団 Adsorbent

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3231724A (en) * 1961-03-31 1966-01-25 Systems Inc Comp Dynamic storage analog computer
GB1361613A (en) * 1970-11-24 1974-07-30 Solartron Electronic Group Analogue to digital converters
BE788936A (en) * 1971-09-27 1973-03-19 Cit Alcatel CONTINUOUS CURRENT COMPENSATOR

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011134470A3 (en) * 2010-04-28 2012-08-16 Miitors Aps Ultrasonic flow meter
US9383239B2 (en) 2010-04-28 2016-07-05 Apator Miitors Aps Ultrasonic flow meter with subsampling of ultrasonic transducer signals
US10605646B2 (en) 2010-04-28 2020-03-31 Apator Miitors Aps Ultrasonic flow meter with subsampling of ultrasonic transducer signals
EP3842767A1 (en) * 2010-04-28 2021-06-30 Apator Miitors ApS Ultrasonic flow meter
US11243109B2 (en) 2010-04-28 2022-02-08 Apator Miitors Aps Ultrasonic flow meter with subsampling of ultrasonic transducer signals
EP4296630A3 (en) * 2010-04-28 2024-04-03 Apator Miitors ApS Ultrasonic flow meter

Also Published As

Publication number Publication date
NL185102B (en) 1989-08-16
NO142687B (en) 1980-06-16
SE407859B (en) 1979-04-23
FR2317657A1 (en) 1977-02-04
FR2317657B1 (en) 1980-08-29
JPS5836728B2 (en) 1983-08-11
IT1071228B (en) 1985-04-02
NO762106L (en) 1977-01-06
SE7607502L (en) 1977-01-06
NL185102C (en) 1990-01-16
NO142687C (en) 1980-09-24
DE2530114B1 (en) 1976-12-30
CH612764A5 (en) 1979-08-15
JPS529478A (en) 1977-01-25
DK302676A (en) 1977-01-06
NL7607346A (en) 1977-01-07

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee