GB1507637A - Acoustic flowmeter - Google Patents
Acoustic flowmeterInfo
- Publication number
- GB1507637A GB1507637A GB4713676A GB4713676A GB1507637A GB 1507637 A GB1507637 A GB 1507637A GB 4713676 A GB4713676 A GB 4713676A GB 4713676 A GB4713676 A GB 4713676A GB 1507637 A GB1507637 A GB 1507637A
- Authority
- GB
- United Kingdom
- Prior art keywords
- khz
- measurement frequency
- modulated
- signal
- filters
- 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
-
- 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
- G01P5/248—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 by measuring phase differences
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
1507637 Acoustic flowmeters PANAMETRICS Inc 12 Nov 1976 47136/76 Heading G1G In an acoustic flowmeter of the type comprising upstream and downstream transducers 11, 13 which alternately transmit and receive acoustic energy, the energy transmitted in each direction consist of a gated burst of a frequency comprising at least a measurement frequency, and there is provided narrow band filter means 45 and 47 for extracting the measurement frequency component of the downstream and the upstream received signals respectively to provide first and second continuous sine-wave signals respectively, and timing means for measuring the phase difference between the two sine-wave signals, which phase difference is proportional to flow velocity. In Fig. 1, the measurement frequency of 5 MHz is modulated by a 2 KHz signal to provide 50 Á sec bursts, and the sine-wave outputs of filters 45, 47 are mixed at 49 and 51 with a 5À002 MHz signal to provide respective hetrodyne signals at 2 KHz which preserve the phase information. The envelopes of the received signals are also detected and processed to determine their phase difference, this also being used to determine the flow velocity. In Fig. 3 (not shown), a 100 KHz carrier is modulated by a measurement frequency of 5 KHz, this modulated signal then being modulated by a 20 Hz signal to provide 50Á sec bursts. The received signals, before being applied to the filters 45 and 47, are applied to respective detectors and filters to recover the 5 KHz measurement frequency component.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4713676A GB1507637A (en) | 1976-11-12 | 1976-11-12 | Acoustic flowmeter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4713676A GB1507637A (en) | 1976-11-12 | 1976-11-12 | Acoustic flowmeter |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1507637A true GB1507637A (en) | 1978-04-19 |
Family
ID=10443866
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4713676A Expired GB1507637A (en) | 1976-11-12 | 1976-11-12 | Acoustic flowmeter |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1507637A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0162237A1 (en) * | 1984-03-30 | 1985-11-27 | Bopp & Reuther Aktiengesellschaft | Method and apparatus for the ultrasonic measurement of fluid-flow velocity |
-
1976
- 1976-11-12 GB GB4713676A patent/GB1507637A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0162237A1 (en) * | 1984-03-30 | 1985-11-27 | Bopp & Reuther Aktiengesellschaft | Method and apparatus for the ultrasonic measurement of fluid-flow velocity |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |