GB1495389A - Apparatus for providing time reference signals - Google Patents

Apparatus for providing time reference signals

Info

Publication number
GB1495389A
GB1495389A GB466574A GB466574A GB1495389A GB 1495389 A GB1495389 A GB 1495389A GB 466574 A GB466574 A GB 466574A GB 466574 A GB466574 A GB 466574A GB 1495389 A GB1495389 A GB 1495389A
Authority
GB
United Kingdom
Prior art keywords
packet
time
negative
time reference
utilized
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
GB466574A
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.)
UK Atomic Energy Authority
Original Assignee
UK Atomic Energy Authority
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 UK Atomic Energy Authority filed Critical UK Atomic Energy Authority
Priority to GB466574A priority Critical patent/GB1495389A/en
Priority to DE19752503538 priority patent/DE2503538C2/en
Priority to FR7502930A priority patent/FR2260229B1/fr
Priority to JP50013252A priority patent/JPS5855441B2/en
Priority to NL7501196A priority patent/NL7501196A/en
Priority to US05/688,945 priority patent/US4080574A/en
Publication of GB1495389A publication Critical patent/GB1495389A/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
    • 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
    • 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
    • G01P5/247—Sing-around-systems

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Measuring Volume Flow (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Manipulation Of Pulses (AREA)

Abstract

1495389 Generating time reference signals UNITED KINGDOM ATOMIC ENERGY AUTHORITY 22 Jan 1975 [31 Jan 1974] 04665/74 Heading H3P A time reference signal is generated, from a pulse, Fig. 1 (not shown) comprising a packet of electrical oscillations, by detecting the first negative-to-positive zero crossing of the packet waveform succeeding a negative excursion whose peak value has exceeded a reference value (26, Fig. 1), circuitry, Figs. 2(B), 4 (not shown) being provided to ensure that the time reference signal is not utilized unless the integrated area of all negative excursions of the packet, representing packet amplitude, exceeds a predetermined limit set to ensure that a utilized time reference signal is produced at the first negative-to-positive zero crossing of the packet waveform. The packet waveform is amplified at 22, an automatic gain control comprising output amplitude detector 29 and comparator 31 with reference input VR tending to keep the average output level, for a plurality of received packets, constant, strobe 25 ensuring that the circuitry is active only for a time period embracing the expected arrival time of each packet. The negative-going excursions are integrated by network (34, Fig. 2(B)), whose time constant substantially exceeds the duration of one packet, but is less than the inter-packet duration, the integrator output, should it exceed a pre-set value for any one packet, operating trigger (35) to enable use of the timing signal generated by the packet. The packet is produced by a transducer receiving an ultrasonic pulse from a transmitter (not shown), the transit time in each of two opposed directions along the same path in a fluid being determined, the time difference representing the path direction component of fluid velocity, see Specification 1,422,791, only packets which have operated the trigger (35) being utilized in the measurement, AND gates (48, 49, Fig. 4) inhibiting use of the weaker ones.
GB466574A 1974-01-31 1974-01-31 Apparatus for providing time reference signals Expired GB1495389A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
GB466574A GB1495389A (en) 1974-01-31 1974-01-31 Apparatus for providing time reference signals
DE19752503538 DE2503538C2 (en) 1974-01-31 1975-01-29 Device for generating a time reference signal from a pulse of electrical signal oscillations
FR7502930A FR2260229B1 (en) 1974-01-31 1975-01-30
JP50013252A JPS5855441B2 (en) 1974-01-31 1975-01-31 How long can you use it?
NL7501196A NL7501196A (en) 1974-01-31 1975-01-31 DEVICE FOR DELIVERING A TIME REPEAL SIGNAL.
US05/688,945 US4080574A (en) 1974-01-31 1976-05-24 Apparatus for providing time reference signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB466574A GB1495389A (en) 1974-01-31 1974-01-31 Apparatus for providing time reference signals

Publications (1)

Publication Number Publication Date
GB1495389A true GB1495389A (en) 1977-12-14

Family

ID=9781479

Family Applications (1)

Application Number Title Priority Date Filing Date
GB466574A Expired GB1495389A (en) 1974-01-31 1974-01-31 Apparatus for providing time reference signals

Country Status (5)

Country Link
JP (1) JPS5855441B2 (en)
DE (1) DE2503538C2 (en)
FR (1) FR2260229B1 (en)
GB (1) GB1495389A (en)
NL (1) NL7501196A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013019311A1 (en) * 2013-11-07 2015-05-07 eonas IT-Beratung und Entwicklung GmbH Ultrasonic flow velocity measurement of liquids and gases with extensive compensation of jitter and offset

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51101568A (en) * 1975-03-05 1976-09-08 Fuji Electric Co Ltd Shingokanshikairo
US4176286A (en) * 1978-03-08 1979-11-27 Bei Electronics, Inc. Signal translator with squelch
JPS5832336B2 (en) * 1978-06-27 1983-07-12 株式会社東芝 ultrasonic current meter
DE3411485A1 (en) 1984-03-28 1985-10-03 Siemens AG, 1000 Berlin und 8000 München METHOD FOR DETECTING THE LIMITS OF SIGNALS THAT APPEAR IN MIXTURE BEFORE A BACKGROUND SIGNAL MIXTURE
GB2200753B (en) * 1986-12-23 1991-01-23 Brookes & Gatehouse Speed measurement device
FR3074913B1 (en) * 2017-12-08 2019-11-22 Sagemcom Energy & Telecom Sas METHOD FOR MEASURING A SPEED OF A FLUID
JP6835265B2 (en) * 2020-01-10 2021-02-24 中国電力株式会社 Measurement and diagnostic equipment and measurement and diagnosis method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD87099A (en) *
US3505537A (en) * 1967-03-09 1970-04-07 Rca Corp Signal envelope discriminator and gating circuit
GB1422791A (en) * 1972-04-04 1976-01-28 Atomic Energy Authority Uk Apparatus for indicating fluid flow velocity

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013019311A1 (en) * 2013-11-07 2015-05-07 eonas IT-Beratung und Entwicklung GmbH Ultrasonic flow velocity measurement of liquids and gases with extensive compensation of jitter and offset

Also Published As

Publication number Publication date
FR2260229B1 (en) 1982-02-19
NL7501196A (en) 1975-08-04
FR2260229A1 (en) 1975-08-29
DE2503538C2 (en) 1984-04-26
JPS5855441B2 (en) 1983-12-09
DE2503538A1 (en) 1975-08-14
JPS50109762A (en) 1975-08-29

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Legal Events

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