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 matterInfo
- 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
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)
- Acoustics & Sound (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Biophysics (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Aviation & Aerospace Engineering (AREA)
- Multimedia (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Pathology (AREA)
- Radiology & Medical Imaging (AREA)
- Biomedical Technology (AREA)
- Computer Networks & Wireless Communication (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (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.
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)
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)
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 |
-
1974
- 1974-01-28 NL NL7401115A patent/NL168701C/en active
- 1974-03-05 GB GB990974A patent/GB1426687A/en not_active Expired
- 1974-03-28 AT AT255974A patent/AT341644B/en not_active IP Right Cessation
- 1974-03-29 FR FR7411121A patent/FR2226663B1/fr not_active Expired
Cited By (3)
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 |
---|---|
FR2226663A1 (en) | 1974-11-15 |
NL7401115A (en) | 1974-10-22 |
DE2319724B2 (en) | 1976-12-16 |
ATA255974A (en) | 1977-06-15 |
DE2319724A1 (en) | 1974-10-31 |
FR2226663B1 (en) | 1976-06-25 |
NL168701C (en) | 1982-05-17 |
AT341644B (en) | 1978-02-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |