GB1398381A - Correlators - Google Patents

Correlators

Info

Publication number
GB1398381A
GB1398381A GB518472*[A GB518472A GB1398381A GB 1398381 A GB1398381 A GB 1398381A GB 518472 A GB518472 A GB 518472A GB 1398381 A GB1398381 A GB 1398381A
Authority
GB
United Kingdom
Prior art keywords
signal
modulated
mixed signal
shift register
delays
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
GB518472*[A
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.)
Kent Instruments Ltd
Original Assignee
Kent Instruments 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 Kent Instruments Ltd filed Critical Kent Instruments Ltd
Priority to GB518472*[A priority Critical patent/GB1398381A/en
Priority to CA144,308A priority patent/CA967679A/en
Priority to US05/555,250 priority patent/US4019038A/en
Publication of GB1398381A publication Critical patent/GB1398381A/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
    • 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
    • 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
    • G01F1/704—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow using marked regions or existing inhomogeneities within the fluid stream, e.g. statistically occurring variations in a fluid parameter
    • G01F1/708—Measuring the time taken to traverse a fixed distance
    • G01F1/7082—Measuring the time taken to traverse a fixed distance using acoustic detecting arrangements
    • 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
    • G01P5/18—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 time taken to traverse a fixed distance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
    • G01S11/14—Systems for determining distance or velocity not using reflection or reradiation using ultrasonic, sonic, or infrasonic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/50—Systems of measurement, based on relative movement of the target
    • G01S15/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/15—Correlation function computation including computation of convolution operations
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
    • G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers
    • G06G7/19—Arrangements for performing computing operations, e.g. operational amplifiers for forming integrals of products, e.g. Fourier integrals, Laplace integrals, correlation integrals; for analysis or synthesis of functions using orthogonal functions
    • G06G7/1928—Arrangements for performing computing operations, e.g. operational amplifiers for forming integrals of products, e.g. Fourier integrals, Laplace integrals, correlation integrals; for analysis or synthesis of functions using orthogonal functions for forming correlation integrals; for forming convolution integrals
    • G06G7/1935—Arrangements for performing computing operations, e.g. operational amplifiers for forming integrals of products, e.g. Fourier integrals, Laplace integrals, correlation integrals; for analysis or synthesis of functions using orthogonal functions for forming correlation integrals; for forming convolution integrals by converting at least one the input signals into a two level signal, e.g. polarity correlators
    • 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
    • G01F1/704—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow using marked regions or existing inhomogeneities within the fluid stream, e.g. statistically occurring variations in a fluid parameter
    • G01F1/708—Measuring the time taken to traverse a fixed distance
    • G01F1/712—Measuring the time taken to traverse a fixed distance using auto-correlation or cross-correlation detection means

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Acoustics & Sound (AREA)
  • Theoretical Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Software Systems (AREA)
  • Computational Mathematics (AREA)
  • Data Mining & Analysis (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • Multimedia (AREA)
  • Algebra (AREA)
  • Computing Systems (AREA)
  • Databases & Information Systems (AREA)
  • Electromagnetism (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Hardware Design (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

1398381 Correlation of noise-modulated signals KENT INSTRUMENTS Ltd 2 June 1972 [10 June 1971 3 Feb 1972] 27366/71 and 5184/72 Heading H4D Two noise-modulated signals for which a particular modulation characteristic occurs earlier on one than on the other are crosscorrelated by subjecting the one signal to at least three different delays to give three or more delayed signals, multiplying the said other signal separately by each of the delayed signals, combining the resulting products in pairs, mixing the combination results to give a mixed signal, and adjusting the delays so as to reduce the mixed signal to zero. The Fig. 3 system, for fluid flow measurement, includes transducers 8, 9 each receiving an ultrasonic beam from respective transmitters (not shown). The beams are phase-modulated by random variations in the flow. Detectors 51, 52 are phase-sensitive and provide a filtered and amplified output in digital form. The upstream output is fed to a shift register 54 with output taps 58-61. Delayed signals from the taps are multiplied with the downstream signal by gates 68-71. The products are combined and integrated by networks 62, 64, then the results are mixed at 56. The mixed signal adjusts the shift register clock 55 frequency, and hence the delays afforded by the register, in a direction to minimize the mixed signal. The clock frequency is then a measure of the transit time of fluid between the transducer locations. In modifications the detectors may be frequency-sensitive and analogue delay devices may be used instead of the shift register. The invention is applicable also to pseudo-randomnoise-modulated radars.
GB518472*[A 1971-06-10 1972-02-03 Correlators Expired GB1398381A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB518472*[A GB1398381A (en) 1971-06-10 1972-02-03 Correlators
CA144,308A CA967679A (en) 1971-06-10 1972-06-09 Correlators
US05/555,250 US4019038A (en) 1971-06-10 1975-03-04 Correlators

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2736671 1971-06-10
GB518472*[A GB1398381A (en) 1971-06-10 1972-02-03 Correlators

Publications (1)

Publication Number Publication Date
GB1398381A true GB1398381A (en) 1975-06-18

Family

ID=26239711

Family Applications (1)

Application Number Title Priority Date Filing Date
GB518472*[A Expired GB1398381A (en) 1971-06-10 1972-02-03 Correlators

Country Status (2)

Country Link
CA (1) CA967679A (en)
GB (1) GB1398381A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1979001119A1 (en) * 1978-05-25 1979-12-27 Sybron Corp Peak tracking correlator
WO1991010913A1 (en) * 1990-01-16 1991-07-25 Tsi Incorporated Coherent frequency burst detector apparatus and method
WO1994017374A1 (en) * 1993-01-29 1994-08-04 Schlumberger Limited Flow meter
GB2376740A (en) * 2001-03-13 2002-12-24 Wrc Plc Method and device for determining fluid flow velocity

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1979001119A1 (en) * 1978-05-25 1979-12-27 Sybron Corp Peak tracking correlator
WO1991010913A1 (en) * 1990-01-16 1991-07-25 Tsi Incorporated Coherent frequency burst detector apparatus and method
WO1994017374A1 (en) * 1993-01-29 1994-08-04 Schlumberger Limited Flow meter
GB2274713B (en) * 1993-01-29 1997-07-02 Schlumberger Ltd Flow meter
GB2376740A (en) * 2001-03-13 2002-12-24 Wrc Plc Method and device for determining fluid flow velocity

Also Published As

Publication number Publication date
CA967679A (en) 1975-05-13

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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