WO2016090424A1 - Flow measurement - Google Patents
Flow measurement Download PDFInfo
- Publication number
- WO2016090424A1 WO2016090424A1 PCT/AU2015/050772 AU2015050772W WO2016090424A1 WO 2016090424 A1 WO2016090424 A1 WO 2016090424A1 AU 2015050772 W AU2015050772 W AU 2015050772W WO 2016090424 A1 WO2016090424 A1 WO 2016090424A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- waveforms
- pipe
- flow rate
- sensor
- algorithm
- Prior art date
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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
- G01F1/665—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 of the drag-type
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- 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
- G01F1/002—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow wherein the flow is in an open channel
Definitions
- the present invention relates to a method and system for measuring the velocity and flow rate of a body of fluid passing through a pipeline or open channel.
- the present invention in one aspect provides a method of measuring the velocity and flow rate of a body of a fluid passing through a pipe or open channel, said method including the steps of : monitoring the decay or attenuation rate of the amplitude of reflected waveforms from at least one sensor located within said pipe or said open channel, determining a relationship or algorithm for said flow rate using calculations derived from system identification techniques based on data received from the monitoring of the decay or attenuation rate of the amplitude of reflected waveforms from said at least one sensor, and once said relationship or algorithm has been determined, using said relationship or algorithm to subsequently measure said flow rate.
- a further aspect of the invention provides a method of determining the velocity and flow rate of a body of a fluid passing through a pipe or open channel, said method including the steps of : monitoring the decay or attenuation rate of the amplitude of reflected waveforms from at least one sensor located within said pipe or said open channel, and determining a relationship or algorithm for said flow rate using calculations derived from system identification techniques based on data received from the monitoring of the decay or attenuation rate of the amplitude of reflected waveforms from said at least one sensor.
- said reflected waveforms are reflected from an opposing inner wall of said pipe; and when said fluid passes through said open channel, said at least one sensor is located on the bottom of said open channel and said reflected waveforms are reflected from the top surface of said fluid. It is preferred that said at least one sensor is acoustic or radar based.
- a plurality of separate waveforms are generated by said at least one sensor.
- the separate waveforms can include a double pulse or variation in frequency.
- the embodiment may also include a time delay between said plurality of separate waveforms.
- the embodiments may include the filtering of scattered reflected waveforms.
- waveform shaping, waveform diversity and/or waveform design may provide an enhanced detection capability.
- a plurality of sensors may also be used.
- an apparatus to measure the velocity and flow rate of a body of a fluid passing through a pipe or open channel including at least one sensor that generate waveforms in said fluid and monitoring the decay or attenuation rate of the amplitude of reflected waveforms from at least one sensor located within said pipe or said open channel using a computer controller or software control, determining a relationship or algorithm for said flow rate using calculations derived from system identification techniques based on data received from the monitoring of the decay or attenuation rate of the amplitude of reflected waveforms from said at least one sensor, and once said relationship or algorithm has been determined, using said relationship or algorithm to subsequently measure said flow rate.
- FIG. 1 is a diagrammatic cross-sectional view of a first embodiment of the invention showing the use of a single sensor in a pipe where there is no flow through the pipe;
- Fig. 2 is a similar view to that of Fig. 1 where there is flow through the pipe;
- FIG. 3 is an enlarged view of the reflection of waves from the inner surface of the pipe in Fig. 1 where the pipe has a smooth inner surface;
- Fig. 4 is a similar view to that of Fig. 3 where the pipe has an irregular inner surface
- Fig. 5 is a graph of the amplitude of the reflected waveforms measured by the sensor against time
- Fig. 6 is a similar view to that of Fig. 2 using a plurality of sensors.
- Fig. 7 is a diagrammatic cross-sectional view of a second embodiment of the invention showing the use of multiple sensors in an open channel.
- Fig. 1 shows a pipe 10 through which a fluid, typically water, flows.
- a fluid typically water
- the invention is not limited to the use with water as it could be used with gaseous mixtures or slurries.
- a sensor 12 typically a transceiver, which can transmit and receive a waveform is fitted to the inside of pipe 10 in a fluid tight manner.
- the transceiver 12 may produce ultrasonic or radar waveforms but is not limited to those waveforms.
- Transceiver 12 may be substituted by a separate
- frequency spectrum is not restricted and can, for example, include light, sound and radio.
- transceiver 12 In use, transceiver 12 generates a waveform 14 that reflects off the inner surface 16 of pipe 10 to provide reflected waveforms 18. The amplitude of each reflected waveform 18 will generate respective signals by said transceiver 12.
- the invention relies on the reflection of the waveform (that originated from transceiver 12) many times within pipe 10 and transceiver 12 detecting each of the reflected waveforms 18 and in turn measuring the decay or attenuation of the amplitude of each of the reflected waveforms 18. There will be an attenuation or decay of the amplitude of reflected waveform 18 over time due to natural travel through the fluid and also scatter on inner surface 16.
- This new approach is to generate a wave (e.g.
- acoustic or radar waveform and measure the decay in amplitude of the reflected waveforms over a period of time.
- the amplitude of the returning waveform will have a repeatable amplitude decay characteristic. As the flow changes the decay characteristic will change and this will be repeatable for the given physical environment and the same flow.
- the rate of attenuation of the amplitude of the waveform will increase as the flow 20 increases (Fig. 2). This will be as a result of the deflection of the reflected wave caused by the moving fluid. All signals from transceiver 12 will be monitored and processed by computer(s) (not shown).
- identification also includes the optimal design of experiments for efficiently generating informative data for fitting such models as well as model reduction.
- a dynamical mathematical model in this context is a mathematical description of the dynamic behaviour of a system or process in either the time or frequency domain.
- the relationship or algorithm can be incorporated in an electronic, software or computer control device (not shown).
- the electronic, software or computer control device will then monitor the flow through pipeline 10 and accurately measure flow rate therethrough.
- Fig. 5 is a graph of the amplitude of the reflected waveforms 18 measured by the sensor 12 against time.
- Q 0 is the graph of the stationary fluid shown in Fig. 1 and Qi and Q 2 shows the variation at predetermined flow rates. From these measurements and the use of system identification techniques the flow rate can be determined in real time.
- the waveform scatter properties of the pipe inner surface 16 material will also be a dependent variable in the decay characteristics of the reflected waveforms 18.
- a preferred implementation may be to use a conduit lining material that minimizes the waveform scatter.
- Fig. 3 shows a smooth inner surface 16 where the incident waveforms 22 have consistent reflected waveforms 24 whereas Fig. 4 shows a roughened inner surface 16 where the reflected waveforms 26 are scattered.
- a smooth plastic pipe would be preferred but roughened metallic pipes could also be used.
- Electronic filtering techniques could be applied to the measured signals to smooth the measured scattered signals using software.
- Fig. 7 shows an open channel 30 with a bottom 32 and plateaus 34, 36.
- One or more sensors 12 may be placed on the bottom 32 and/or plateaus 34, 36.
- the waveforms 14 would be reflected by the surface 38 of the fluid and returned as reflected waveforms 18.
- the depth A, B, C of the fluid at could also be derived using this technique using the sensors 12.
- a further embodiment of this invention may employ waveform shaping (or waveform diversity or waveform design) to achieve improved detection performance. This approach would use the power, frequency and time domain aspects of the waveform in order to create a signal that results in enhanced detection capability.
- separate waveforms can be generated which could include a double pulse or variation in frequency.
- a time delay between the separate waveforms can also be applied.
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Measuring Volume Flow (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2014904952 | 2014-12-08 | ||
AU2014904952A AU2014904952A0 (en) | 2014-12-08 | Flow measurement |
Publications (1)
Publication Number | Publication Date |
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WO2016090424A1 true WO2016090424A1 (en) | 2016-06-16 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/AU2015/050772 WO2016090424A1 (en) | 2014-12-08 | 2015-12-07 | Flow measurement |
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WO (1) | WO2016090424A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109506719A (en) * | 2018-12-03 | 2019-03-22 | 南通大学 | A kind of non-plains region water flow of open canal device and method |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7461999B2 (en) * | 2000-08-21 | 2008-12-09 | Rubicon Research Pty, Ltd. | Flow measurement and control |
US20090025487A1 (en) * | 2006-07-27 | 2009-01-29 | Gysling Daniel L | Apparatus and method for attenuating acoustic waves in propagating within a pipe wall |
US8489342B2 (en) * | 2011-03-18 | 2013-07-16 | Soneter, LLC | Methods and apparatus for fluid flow measurement |
DE102012011165A1 (en) * | 2012-06-05 | 2013-12-05 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Device for detecting object, has radio transmitter for transmitting electromagnetic waves, and radio receiver for detecting electromagnetic waves, while attenuation of electromagnetic wave is detected by evaluation unit |
WO2014032083A1 (en) * | 2012-08-28 | 2014-03-06 | Rubicon Research Pty Ltd | Flow meter with acoustic array |
-
2015
- 2015-12-07 WO PCT/AU2015/050772 patent/WO2016090424A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7461999B2 (en) * | 2000-08-21 | 2008-12-09 | Rubicon Research Pty, Ltd. | Flow measurement and control |
US20090025487A1 (en) * | 2006-07-27 | 2009-01-29 | Gysling Daniel L | Apparatus and method for attenuating acoustic waves in propagating within a pipe wall |
US8489342B2 (en) * | 2011-03-18 | 2013-07-16 | Soneter, LLC | Methods and apparatus for fluid flow measurement |
DE102012011165A1 (en) * | 2012-06-05 | 2013-12-05 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Device for detecting object, has radio transmitter for transmitting electromagnetic waves, and radio receiver for detecting electromagnetic waves, while attenuation of electromagnetic wave is detected by evaluation unit |
WO2014032083A1 (en) * | 2012-08-28 | 2014-03-06 | Rubicon Research Pty Ltd | Flow meter with acoustic array |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109506719A (en) * | 2018-12-03 | 2019-03-22 | 南通大学 | A kind of non-plains region water flow of open canal device and method |
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