GB1426687A - Mean frequency measurement and its application to monitoring the motion of matter - Google Patents

Mean frequency measurement and its application to monitoring the motion of matter

Info

Publication number
GB1426687A
GB1426687A GB990974A GB990974A GB1426687A GB 1426687 A GB1426687 A GB 1426687A GB 990974 A GB990974 A GB 990974A GB 990974 A GB990974 A GB 990974A GB 1426687 A GB1426687 A GB 1426687A
Authority
GB
United Kingdom
Prior art keywords
fluid
detected
signal
doppler
mean
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
GB990974A
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.)
Siemens AG
Original Assignee
Siemens AG
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 DE19732319724 external-priority patent/DE2319724C3/en
Application filed by Siemens AG filed Critical Siemens AG
Publication of GB1426687A publication Critical patent/GB1426687A/en
Expired legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/06—Measuring blood flow
    • 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
    • G01P5/241—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 using reflection of acoustical waves, i.e. Doppler-effect
    • G01P5/242—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 using reflection of acoustical waves, i.e. Doppler-effect involving continuous, e.g. modulated or unmodulated, 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
    • G01S15/586—Velocity or trajectory determination systems; Sense-of-movement determination systems using transmission of continuous unmodulated waves, amplitude-, frequency-, or phase-modulated waves and based upon the Doppler effect resulting from movement of targets

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Remote Sensing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Pathology (AREA)
  • Veterinary Medicine (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Biomedical Technology (AREA)
  • Radiology & Medical Imaging (AREA)
  • Multimedia (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Biophysics (AREA)
  • Hematology (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)

Abstract

1426687 Blood flow measurement SIEMENS AG 5 March 1974 [18 April 1973] 9909/74 Heading H4D [Also in Division Gl] Practical systems for measuring the rate of flow of fluid, such as blood, by injecting an ultrasonic signal into the fluid, detecting the signal at a downstream point and measuring the Doppler frequency shift produced by the fluid, suffer from the disadvantage that although ideally if a single frequency is injected into the fluid a single frequency, Doppler shifted, should be detected, in practice because all particles of the fluid do not move at exactly the same speed the detected signal has a continuous spectrum, and therefore it is not obvious how the Doppler shift should be evaluated. According to the present invention by taking as the Doppler shift the mean frequency of the detected signal over its energy density function, a good estimate of the mean rate of flow of the fluid can be obtained. As described, an ultrasonic signal 4, Fig. 1, is injected 2 into the fluid, and detected 3 downstream, and the detected signal is amplified 5, the Doppler shift components are extracted 6, 7, and the required mean is evaluated (see Division G1) and displayed 14.
GB990974A 1973-04-18 1974-03-05 Mean frequency measurement and its application to monitoring the motion of matter Expired GB1426687A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732319724 DE2319724C3 (en) 1973-04-18 Device for measuring the speed of flowing media

Publications (1)

Publication Number Publication Date
GB1426687A true GB1426687A (en) 1976-03-03

Family

ID=5878559

Family Applications (1)

Application Number Title Priority Date Filing Date
GB990974A Expired GB1426687A (en) 1973-04-18 1974-03-05 Mean frequency measurement and its application to monitoring the motion of matter

Country Status (4)

Country Link
AT (1) AT341644B (en)
FR (1) FR2226663B1 (en)
GB (1) GB1426687A (en)
NL (1) NL168701C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994023652A1 (en) * 1993-04-19 1994-10-27 Commonwealth Scientific And Industrial Research Organisation Tissue characterisation using intravascular echoscopy
AU672694B2 (en) * 1993-04-19 1996-10-10 Commonwealth Scientific And Industrial Research Organisation Tissue characterisation using intravascular echoscopy

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3137466A1 (en) * 1981-09-21 1983-04-07 Siemens AG, 1000 Berlin und 8000 München METHOD AND DEVICE FOR MEASURING FLOW BY THE ULTRASONIC PULSE DOPPLER METHOD

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994023652A1 (en) * 1993-04-19 1994-10-27 Commonwealth Scientific And Industrial Research Organisation Tissue characterisation using intravascular echoscopy
GB2291969A (en) * 1993-04-19 1996-02-07 Commw Scient Ind Res Org Tissue characterisation using intravascular echoscopy
AU672694B2 (en) * 1993-04-19 1996-10-10 Commonwealth Scientific And Industrial Research Organisation Tissue characterisation using intravascular echoscopy

Also Published As

Publication number Publication date
NL7401115A (en) 1974-10-22
FR2226663A1 (en) 1974-11-15
ATA255974A (en) 1977-06-15
AT341644B (en) 1978-02-27
FR2226663B1 (en) 1976-06-25
NL168701C (en) 1982-05-17
DE2319724B2 (en) 1976-12-16
DE2319724A1 (en) 1974-10-31

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Legal Events

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