CA1304602C - Apparatus for and method of determining liquid flow in open channels and conduits - Google Patents
Apparatus for and method of determining liquid flow in open channels and conduitsInfo
- Publication number
- CA1304602C CA1304602C CA000601793A CA601793A CA1304602C CA 1304602 C CA1304602 C CA 1304602C CA 000601793 A CA000601793 A CA 000601793A CA 601793 A CA601793 A CA 601793A CA 1304602 C CA1304602 C CA 1304602C
- Authority
- CA
- Canada
- Prior art keywords
- sensors
- flow
- fluid
- liquid
- conduit
- 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 - Lifetime
Links
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
- G01F1/56—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 using electric or magnetic effects
- G01F1/58—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 using electric or magnetic effects by electromagnetic flowmeters
- G01F1/60—Circuits therefor
-
- 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
-
- 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
- G01F1/56—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 using electric or magnetic effects
- G01F1/58—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 using electric or magnetic effects by electromagnetic flowmeters
- G01F1/588—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 using electric or magnetic effects by electromagnetic flowmeters combined constructions of electrodes, coils or magnetic circuits, accessories therefor
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Measuring Volume Flow (AREA)
Abstract
Abstract of the Disclosure Measurement of flow in conduits such as open channels, including irregularly shaped channels such as rivers, can be accurately determined by measuring the profile of the flow of conductive liquids within the conduit and by determining the total flow rate by applying the mean flow rate to the wetted cross sectional area of the conduit. The segmented sesnsor portion of the apparatus may be easily,installed in a conduit having any configuration and the censor does not significantly affect the flow of liquid in the conduit.
Description
~3~6~2 SPECIFICATION
(a) Title of the Invention APPARATUS FOR AND METHOD OF DETERMINING LIQUID FLO
IN OPEN CHANNELS AND CONDUITS.
(b) Name of Inventor Paul F. Mahler (c) Cross reference to related applications None (d) Background of the Invention 1) Field of the invention My present invention is concerned with an apparatus for and a method of determining fluid pararneters, and particularly liquid flow parameters in conduits such as open channels.
More particularly my invention is concerned with determining the flow of liquids in conduits such as partially filled pipes, open channels of known geometric cross section, and rivers where the cross section of the channel may vary or change. Measurements are taken irrespective of the level of the liquid in the conduit since the sensing device detects all flow parameters within the conduit and this reference information is ooDditioned and processed within the electronics portion to provide the specific flow information. This information may be used to monitor or control the liquid flow within the conduit.
~30~
(a) Title of the Invention APPARATUS FOR AND METHOD OF DETERMINING LIQUID FLO
IN OPEN CHANNELS AND CONDUITS.
(b) Name of Inventor Paul F. Mahler (c) Cross reference to related applications None (d) Background of the Invention 1) Field of the invention My present invention is concerned with an apparatus for and a method of determining fluid pararneters, and particularly liquid flow parameters in conduits such as open channels.
More particularly my invention is concerned with determining the flow of liquids in conduits such as partially filled pipes, open channels of known geometric cross section, and rivers where the cross section of the channel may vary or change. Measurements are taken irrespective of the level of the liquid in the conduit since the sensing device detects all flow parameters within the conduit and this reference information is ooDditioned and processed within the electronics portion to provide the specific flow information. This information may be used to monitor or control the liquid flow within the conduit.
~30~
2) PrLor art The hitherto ernployed rnethods of rneasuring liquid flow include the use of weirs, or venturi systems, or similar means to restrict the flow of the liquid in an open channel at preselected locations. Based on the level at the weir or venturi locations one can then calculate the flow rate, i.e. distance travelled by the liquid in a given unit of time.
Such methods are not fully satisfactory at times due to the cross-sectional area variations of the open channel or conduit.
In this specification the term open channel includes conduits that are not fully occupied by the particular liquid. The term is to include conduits, pipes, channel formations, river channels and the like.
The mentioned variations in channel dimensions affect the liquid flow and the respective flow determinations may not be uniform and the flow rate calculations would then be unfavourably impacted. At times some of the liquid is retained upstream of the restriction, i.e. weir or venturi or other restriction. Furthermore installation of the prior art devices is difficult, and maintenance and space requirements can be of detrimental concern.
There has remained the need to provide an apparatus which o will allow effective monitoring of the liquid in a conduit and the conversion or calculation of referenoe information in a more rapid manner than hitherto has been achieveable with prior art devices.
There has remained the need to provide an efficient and substantially instantaneous method of sensing liquid and its flow parameters for the effective control of liquid flowing in a conduit.
~3~ %
(e) Summary of the Invention In accordance with my invention there is provided a sensor apparatus for determining liquid flow in conduits which comprises a multiple of sensing units that when stacked to the desired length, depending on the diameter of the conduit or the depth of the channel in flood condition, form the full length of the sensor apparatus. The stacked ~ensing devices then form the full body of the sensing portion of the apparatus and this sensing portion is fixed in a set location within the conduit.
Each sensing unit within the body stack is capable of determining the fluid parameters within its area of influence.
The embodiment of my invention is an apparatus for 2 determining liquid flow volume of a conductive liquid in a conduit through the collection of data representative of velocity of liquid flow within a multiplicity of segments throughout the depth of the liquid. Each segment is represented by each sensing portion within the sensor body.
The apparatus includes a means of conditioning the data representative of the velocity of the liquid as collected from each sensing segment within the sensor
Such methods are not fully satisfactory at times due to the cross-sectional area variations of the open channel or conduit.
In this specification the term open channel includes conduits that are not fully occupied by the particular liquid. The term is to include conduits, pipes, channel formations, river channels and the like.
The mentioned variations in channel dimensions affect the liquid flow and the respective flow determinations may not be uniform and the flow rate calculations would then be unfavourably impacted. At times some of the liquid is retained upstream of the restriction, i.e. weir or venturi or other restriction. Furthermore installation of the prior art devices is difficult, and maintenance and space requirements can be of detrimental concern.
There has remained the need to provide an apparatus which o will allow effective monitoring of the liquid in a conduit and the conversion or calculation of referenoe information in a more rapid manner than hitherto has been achieveable with prior art devices.
There has remained the need to provide an efficient and substantially instantaneous method of sensing liquid and its flow parameters for the effective control of liquid flowing in a conduit.
~3~ %
(e) Summary of the Invention In accordance with my invention there is provided a sensor apparatus for determining liquid flow in conduits which comprises a multiple of sensing units that when stacked to the desired length, depending on the diameter of the conduit or the depth of the channel in flood condition, form the full length of the sensor apparatus. The stacked ~ensing devices then form the full body of the sensing portion of the apparatus and this sensing portion is fixed in a set location within the conduit.
Each sensing unit within the body stack is capable of determining the fluid parameters within its area of influence.
The embodiment of my invention is an apparatus for 2 determining liquid flow volume of a conductive liquid in a conduit through the collection of data representative of velocity of liquid flow within a multiplicity of segments throughout the depth of the liquid. Each segment is represented by each sensing portion within the sensor body.
The apparatus includes a means of conditioning the data representative of the velocity of the liquid as collected from each sensing segment within the sensor
3 body. A calculator means, such as a microprocessor, is used for forming from the conditioned data representative of the velocity of flow, and from progammed input data representative of the cross section of the conduit, an output value, or output values, representative of the velocity of flow, liquid level and volume of flow.
~3~L61);~
In accordance with another aspect of my lnvention there i9 provided a method of determinine liquid flow in reference to liquid level in a conduit and of scanning the liquid flow to determine a profile of the liquid flow in the conduit.
Included in the objects of my invention are:
1 _ To provide an apparatus which does not unduly influence the liquid flowing in the conduit.
- To provide an apparatus which may be easily installed in the conduit.
- To provide an apparatus which may be self cleaning.
- To provide an apparatus that requires minimal maintenance.
; - To provide an apparatus and a method of accuately monitoring liquid flow in conduits, and which is not affected by changing hydraulic conditions.
(f) Description of the Drawings Other and further objects and advantages of my invention will become more readily apparent from the following detailed description taken in conjunction with the accompanying drawings in which:
FIG 1, 2 and 3 respectively are diagramatic representations of an open channel.
FIG 4 is a diagramatic representation of my invention ` fixedly located within a circular conduit. any 3 conduit configuration may be used.
FIG 5 is a side elevation sectional view of the sensing element in accordance with the embodiment of my invention depicting the essential elements of the construction of the apparatus.
~, '`' %
FIG 6 is a side elevation view of the senslng e]ernent ln accordance with the embodiment of my invention depicting the contact electrode arrangement and a method of fixing the apparatus within the confines of a fully enclosed open channel.
FIG 7 is a schematic representation of the electrical cicuitry within the sensing portion of my invention whereby the energizing current to the magnetic coil is directed in a scanning manner along the fu].l length of the sensing portion of my invention. Likewise the voltage or current induced by the conductive liquid passing the electrodes is recognized and processed in a scanning action.
FIG 8 is a schematic representation of the electrical circuitry within the sensing portion of my invention whereby the energizing current to the magnetic coil is directed in a scanning manner along the full length of the sensing portion of my invention and the electrodes are arranged in a parallel connection manner to generate an induced voltage or current where the electrical circuit is completed by the conductive liquid between the electrode pairs.
FIG 9 is a schematic representation of the electrical circuitry within the sensing portion of my invention whereby the energizing current to the magnetic coil is directed to the colls by hooking the coils electrically in seri.es manner thus energi~ing all the coils simultaneously and the ::
volta~e or current induced by the conductive liquid passing the electrodes is recognized and processed in a scanning manner.
FIG 10 is a5ch~matic representation of the electrical circuitry within the sensing portion of my invention whereby the energizing current to the magnetic coil is directed to the coils by hooking the coils electrically in series manner thus energizing the coils simultaneously and the electrodes are arranged in a parallel connection to generate an induced voltage or current where the electrical circuit is completed by the conductive liquid between the electrode pairs.
FIG 11 is a schematic representation of the electrical circuitry within the sensing portion of my invention whereby the energizing current to the magnetic coil is directed to the coils by hooking the coils electrically in parallel manner thus energizing the coils simultaneously and the voltage or current induced by the conductive liquid passing the electrodes is recognized and processed in a scanning manner.
FIG 12 is a schematic representation o~ the electrical circuitry within the sensing portion of my invention whereby the the energizing current to the magnetic coil is directed to the coils by hooking the coils electrically in parallel manner thus energizing the coils simultaneously and the electrodes are arranged in parallel connection manner to generate an induced voltage or current where the electrical circuit is completed by the conductive liquid between the electrode pairs.
:
~3~
(g) Specific description My apparatus is particularly intended to determine the prevailing flow velocity at a given plane beneath the surface of a stream of flowing liquid "L" passing through a conduit "C", especially an open channel which includes an irregular channel as in a river channel.
This can be done, for example, by determining the voltage or current induced by passing a conductive liquid through a magnetic field tFaraday) and the voltage reading is processed and translated into the velocity of flow at the specific pick-up point by a respective read-out device.
In conformity with the depth of the flowing stream the velocity profile in the stream will change. The apparatus embodied in my invention is designed to provide readings of flow velocity relating to individual segmental planes throughout the depth of the liquid or to provide a depth averaged velocity for the liquid.
With reference to FIG 4 the apparatus 1 is made up of a multiple of sensor units 2, which when stacked to the desired length depending on the potential liquid depth in the conduit under flood conditions, forms the full length of the sensing portion of my apparatus. The stacked sensors 2 then form the body of the sensing ; 30 apparatus. At one end of the sensing apparatus is secured a fixed mounting pad 3 while at the opposite end 4 of the sensing apparatus is an ad~ustment pad to securely position the sensing apparatus within a circular channel "C". Other mounting devices will be used depending on the shape and construction of the specific channel.
The sensor units 2 are of the type that take readings in conformance with the velocity of the respective liquid "L"
~3~6~;~
passing through channel "C". These readings are passed through a line 5 to a signal conditioner and read-out device, not shown, but known in the art.
With reference to FIG 5 and 6 the apparatus 1 is made up of a hollow central core 6 which has been securely fastened to the end mounting pad 3 and over which is placed the electrical excitation coil 7 and the high permeability circular pole shoe 8 to the required length. Matching outer body segments 9 are made of a non-conductive and non-magnetic material. Stainless steel electrodes 10, or electrodes made from other conductive material, are set into the outer body and are connected to the signal conditioner through wire 11. The outer body segments g are sealed continuouslY
together in columnar form with "0" rings 12 to make the overall unit watertight. The sensing apparatus top element 4 is held securely in place by nut 14 which also clamps all segments 9 securely together. Cable connections 5 from the electrodes 10 and coils 7 are fed through watertight connection 13 to the electronic signal conditioner. Watertight cap 15 seals all internal components from outside moisture.
With reference to FIG 4 and with particular reference to the electrical connections illustrated in FIG 7 through FIG 12 a magnetic field is established at each ; segment of excitation coil 7 due to the exci~ation of the coil. Since an electrical voltage or current is induced between the electrodes relating to the magnetic field by the flow of a conductive liquid through the magnetic field (Faraday) and since the induced volta~e or current is directly proportional to the velocity of flow of the liquid then the velocity of the liquid at the segment can be computed. Since voltage or current can only be induced where there ~L3~ ()2 is liquid flow then the level of the liquid will be known and the cross-sectional or wetted area of the flowing liquid will be known.
Volume of flow "Q" can then be computed by integrating the formula:
Q = V x A
where V equals the velocity of the liquid and A equals the cross-sectional area of the liquid in the channel.
--.
,.
, ., :' ~
~3~L61);~
In accordance with another aspect of my lnvention there i9 provided a method of determinine liquid flow in reference to liquid level in a conduit and of scanning the liquid flow to determine a profile of the liquid flow in the conduit.
Included in the objects of my invention are:
1 _ To provide an apparatus which does not unduly influence the liquid flowing in the conduit.
- To provide an apparatus which may be easily installed in the conduit.
- To provide an apparatus which may be self cleaning.
- To provide an apparatus that requires minimal maintenance.
; - To provide an apparatus and a method of accuately monitoring liquid flow in conduits, and which is not affected by changing hydraulic conditions.
(f) Description of the Drawings Other and further objects and advantages of my invention will become more readily apparent from the following detailed description taken in conjunction with the accompanying drawings in which:
FIG 1, 2 and 3 respectively are diagramatic representations of an open channel.
FIG 4 is a diagramatic representation of my invention ` fixedly located within a circular conduit. any 3 conduit configuration may be used.
FIG 5 is a side elevation sectional view of the sensing element in accordance with the embodiment of my invention depicting the essential elements of the construction of the apparatus.
~, '`' %
FIG 6 is a side elevation view of the senslng e]ernent ln accordance with the embodiment of my invention depicting the contact electrode arrangement and a method of fixing the apparatus within the confines of a fully enclosed open channel.
FIG 7 is a schematic representation of the electrical cicuitry within the sensing portion of my invention whereby the energizing current to the magnetic coil is directed in a scanning manner along the fu].l length of the sensing portion of my invention. Likewise the voltage or current induced by the conductive liquid passing the electrodes is recognized and processed in a scanning action.
FIG 8 is a schematic representation of the electrical circuitry within the sensing portion of my invention whereby the energizing current to the magnetic coil is directed in a scanning manner along the full length of the sensing portion of my invention and the electrodes are arranged in a parallel connection manner to generate an induced voltage or current where the electrical circuit is completed by the conductive liquid between the electrode pairs.
FIG 9 is a schematic representation of the electrical circuitry within the sensing portion of my invention whereby the energizing current to the magnetic coil is directed to the colls by hooking the coils electrically in seri.es manner thus energi~ing all the coils simultaneously and the ::
volta~e or current induced by the conductive liquid passing the electrodes is recognized and processed in a scanning manner.
FIG 10 is a5ch~matic representation of the electrical circuitry within the sensing portion of my invention whereby the energizing current to the magnetic coil is directed to the coils by hooking the coils electrically in series manner thus energizing the coils simultaneously and the electrodes are arranged in a parallel connection to generate an induced voltage or current where the electrical circuit is completed by the conductive liquid between the electrode pairs.
FIG 11 is a schematic representation of the electrical circuitry within the sensing portion of my invention whereby the energizing current to the magnetic coil is directed to the coils by hooking the coils electrically in parallel manner thus energizing the coils simultaneously and the voltage or current induced by the conductive liquid passing the electrodes is recognized and processed in a scanning manner.
FIG 12 is a schematic representation o~ the electrical circuitry within the sensing portion of my invention whereby the the energizing current to the magnetic coil is directed to the coils by hooking the coils electrically in parallel manner thus energizing the coils simultaneously and the electrodes are arranged in parallel connection manner to generate an induced voltage or current where the electrical circuit is completed by the conductive liquid between the electrode pairs.
:
~3~
(g) Specific description My apparatus is particularly intended to determine the prevailing flow velocity at a given plane beneath the surface of a stream of flowing liquid "L" passing through a conduit "C", especially an open channel which includes an irregular channel as in a river channel.
This can be done, for example, by determining the voltage or current induced by passing a conductive liquid through a magnetic field tFaraday) and the voltage reading is processed and translated into the velocity of flow at the specific pick-up point by a respective read-out device.
In conformity with the depth of the flowing stream the velocity profile in the stream will change. The apparatus embodied in my invention is designed to provide readings of flow velocity relating to individual segmental planes throughout the depth of the liquid or to provide a depth averaged velocity for the liquid.
With reference to FIG 4 the apparatus 1 is made up of a multiple of sensor units 2, which when stacked to the desired length depending on the potential liquid depth in the conduit under flood conditions, forms the full length of the sensing portion of my apparatus. The stacked sensors 2 then form the body of the sensing ; 30 apparatus. At one end of the sensing apparatus is secured a fixed mounting pad 3 while at the opposite end 4 of the sensing apparatus is an ad~ustment pad to securely position the sensing apparatus within a circular channel "C". Other mounting devices will be used depending on the shape and construction of the specific channel.
The sensor units 2 are of the type that take readings in conformance with the velocity of the respective liquid "L"
~3~6~;~
passing through channel "C". These readings are passed through a line 5 to a signal conditioner and read-out device, not shown, but known in the art.
With reference to FIG 5 and 6 the apparatus 1 is made up of a hollow central core 6 which has been securely fastened to the end mounting pad 3 and over which is placed the electrical excitation coil 7 and the high permeability circular pole shoe 8 to the required length. Matching outer body segments 9 are made of a non-conductive and non-magnetic material. Stainless steel electrodes 10, or electrodes made from other conductive material, are set into the outer body and are connected to the signal conditioner through wire 11. The outer body segments g are sealed continuouslY
together in columnar form with "0" rings 12 to make the overall unit watertight. The sensing apparatus top element 4 is held securely in place by nut 14 which also clamps all segments 9 securely together. Cable connections 5 from the electrodes 10 and coils 7 are fed through watertight connection 13 to the electronic signal conditioner. Watertight cap 15 seals all internal components from outside moisture.
With reference to FIG 4 and with particular reference to the electrical connections illustrated in FIG 7 through FIG 12 a magnetic field is established at each ; segment of excitation coil 7 due to the exci~ation of the coil. Since an electrical voltage or current is induced between the electrodes relating to the magnetic field by the flow of a conductive liquid through the magnetic field (Faraday) and since the induced volta~e or current is directly proportional to the velocity of flow of the liquid then the velocity of the liquid at the segment can be computed. Since voltage or current can only be induced where there ~L3~ ()2 is liquid flow then the level of the liquid will be known and the cross-sectional or wetted area of the flowing liquid will be known.
Volume of flow "Q" can then be computed by integrating the formula:
Q = V x A
where V equals the velocity of the liquid and A equals the cross-sectional area of the liquid in the channel.
--.
,.
, ., :' ~
Claims (6)
OR PROPERTY IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Apparatus for determining the flow rate of a conductive liquid passing through a conduit comprising:
a plurality of sensors for determining fluid flow, each sensor comprising an electromagnetic coil and a pair of electrodes;
the sensors being sealed continuously together in columnar form; and conditioning means for receiving and processing signals from the electrodes.
a plurality of sensors for determining fluid flow, each sensor comprising an electromagnetic coil and a pair of electrodes;
the sensors being sealed continuously together in columnar form; and conditioning means for receiving and processing signals from the electrodes.
2. The apparatus of claim 1 in which the sensors are connected together serially.
3. The apparatus of claim 1 in which the sensors are connected together in parallel.
4. The apparatus of claim 1 in which the sensors are each circular in cross-section and stacked together to form a cylinder.
5. A method for determining the height of a fluid in an open channel using a plurality of stacked electromagnetic sensors comprising the steps of:
locating the plurality of stacked sensors in the fluid;
receiving signals from the plurality of sensors; and determining which of the plurality of sensors provides a signal indicative of the presence of fluid flow, to thereby determine the height of the fluid.
locating the plurality of stacked sensors in the fluid;
receiving signals from the plurality of sensors; and determining which of the plurality of sensors provides a signal indicative of the presence of fluid flow, to thereby determine the height of the fluid.
6. The method of claim 5 further including:
determining the flow rate in the fluid at each of the plurality of sensors; and calculating the volume of flow by integrating the following formula over the height of the fluid:
Q - V x A
where V is the velocity of the fluid and A is the cross-sectional area of the fluid.
determining the flow rate in the fluid at each of the plurality of sensors; and calculating the volume of flow by integrating the following formula over the height of the fluid:
Q - V x A
where V is the velocity of the fluid and A is the cross-sectional area of the fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000601793A CA1304602C (en) | 1989-06-05 | 1989-06-05 | Apparatus for and method of determining liquid flow in open channels and conduits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000601793A CA1304602C (en) | 1989-06-05 | 1989-06-05 | Apparatus for and method of determining liquid flow in open channels and conduits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1304602C true CA1304602C (en) | 1992-07-07 |
Family
ID=4140162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000601793A Expired - Lifetime CA1304602C (en) | 1989-06-05 | 1989-06-05 | Apparatus for and method of determining liquid flow in open channels and conduits |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1304602C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2521895A1 (en) * | 2010-01-06 | 2012-11-14 | McCrometer, Inc. | Sensor assembly for a fluid flowmeter |
| GB2527324B (en) * | 2014-06-18 | 2018-07-18 | Hunt Andrew | Segmented electromagnetic sensor |
| CN111207796A (en) * | 2020-01-16 | 2020-05-29 | 南京大学 | Drainage pipeline and open channel flow measuring device |
| CN111693982A (en) * | 2020-06-09 | 2020-09-22 | 成都万江港利科技股份有限公司 | Radar speed measurement AI algorithm |
| CN113932862A (en) * | 2021-09-30 | 2022-01-14 | 上海市环境科学研究院 | Water quality monitoring method for water inlet quantity of dry land farmland ditch in tidal river network region |
| EP3974782A1 (en) * | 2020-09-29 | 2022-03-30 | Flow-Tronic S.A. | Sensor assembly for measuring the average velocity in conduits or open channels |
-
1989
- 1989-06-05 CA CA000601793A patent/CA1304602C/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2521895A1 (en) * | 2010-01-06 | 2012-11-14 | McCrometer, Inc. | Sensor assembly for a fluid flowmeter |
| EP2521895A4 (en) * | 2010-01-06 | 2017-05-17 | McCrometer, Inc. | Sensor assembly for a fluid flowmeter |
| GB2527324B (en) * | 2014-06-18 | 2018-07-18 | Hunt Andrew | Segmented electromagnetic sensor |
| CN111207796A (en) * | 2020-01-16 | 2020-05-29 | 南京大学 | Drainage pipeline and open channel flow measuring device |
| CN111693982A (en) * | 2020-06-09 | 2020-09-22 | 成都万江港利科技股份有限公司 | Radar speed measurement AI algorithm |
| CN111693982B (en) * | 2020-06-09 | 2023-09-12 | 成都万江港利科技股份有限公司 | Radar speed measurement AI algorithm |
| EP3974782A1 (en) * | 2020-09-29 | 2022-03-30 | Flow-Tronic S.A. | Sensor assembly for measuring the average velocity in conduits or open channels |
| WO2022069946A1 (en) * | 2020-09-29 | 2022-04-07 | Flow-Tronic S.A. | Sensor assembly for measuring the average velocity in conduits or open channels |
| CN113932862A (en) * | 2021-09-30 | 2022-01-14 | 上海市环境科学研究院 | Water quality monitoring method for water inlet quantity of dry land farmland ditch in tidal river network region |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203177906U (en) | Magnetic flow meter provided with multiple coils | |
| CN207096167U (en) | Detection apparatus for pipeline passes through outer anticorrosive coating of section under water | |
| US4688432A (en) | Averaging velocity sensor for measuring fluid flow in a conduit | |
| US4363244A (en) | Fluid velocity meter | |
| US4683419A (en) | Method and apparatus for detecting faults in a structure by measuring voltage drop between surface points thereof | |
| KR850004801A (en) | Relative Distribution Device of Pulverized Coal | |
| NO852271L (en) | FLOW MEASURES THAT FEEL ELECTRICAL CHARGING | |
| CN111397675A (en) | High-precision non-full pipe electromagnetic flowmeter | |
| EP0483578A1 (en) | Procedure and probe for detection of particulate matter in a liquid or gas stream | |
| CA1304602C (en) | Apparatus for and method of determining liquid flow in open channels and conduits | |
| JPH07198433A (en) | Area type flowmeter | |
| CN108007500A (en) | Resistance chromatographs concentration and velocity measurement sensor system | |
| EP4165378B1 (en) | Flow meter for measuring flow velocity in oil continuous flows | |
| Rhoades | Determining soil salinity from measurements of electrical conductivity | |
| GB2403542A (en) | Electromagnetic flowmeter having elongate electrodes and magnets | |
| DE4010622A1 (en) | Detecting and interpreting leaks using current emitting electrode - moved among flow pipe by measuring current flowing to static earth electrode | |
| CN110442176A (en) | A kind of Groundwater of Well Irrigated Areas and Optimal yield and level of ground water Combined Control Unit | |
| CN111189881A (en) | Two-phase flow grid sensor visualization method based on differential measurement mode | |
| US3885433A (en) | Apparatus for measuring the velocity of flow of an electrically conductive fluid | |
| EP0305609B1 (en) | Averaging velocity sensor for measuring fluid flow in a conduit | |
| CN212058918U (en) | High-precision non-full pipe electromagnetic flowmeter | |
| JP3953826B2 (en) | Insertion type electromagnetic current meter | |
| RU2164661C1 (en) | Intertubular multi-channel profilometer | |
| CN113358943B (en) | Oil flow electrification measuring device and full-section charge measuring method | |
| US3040571A (en) | Electromagnetic flowmeter for conductive fluids |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |