CN102109451B - Non-contact conductive gas/liquid two-phase flow pattern identifying device and method - Google Patents
Non-contact conductive gas/liquid two-phase flow pattern identifying device and method Download PDFInfo
- Publication number
- CN102109451B CN102109451B CN2011100243372A CN201110024337A CN102109451B CN 102109451 B CN102109451 B CN 102109451B CN 2011100243372 A CN2011100243372 A CN 2011100243372A CN 201110024337 A CN201110024337 A CN 201110024337A CN 102109451 B CN102109451 B CN 102109451B
- Authority
- CN
- China
- Prior art keywords
- liquid
- conductance
- flow
- gas
- sensor
- 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 - Fee Related
Links
Images
Abstract
The invention discloses a non-contact conductive gas/liquid two-phase flow pattern identifying device and method thereof. The device comprises a gas/liquid two-phase flow measuring pipeline, an alternating-current excitation source, a capacitive coupling non-contact conductive sensor, a temperature sensor, a current/voltage conversion unit, an alternating-current rectifying unit, a filter unit, a direct-current amplifying unit, a data acquisition module and a computer. The method comprises the following steps: firstly, the capacitive coupling non-contact conductive sensor obtains conductance signals of flows of the gas/liquid two phases; then, characteristic values of the obtained conductance signals are extracted via a time domain collection method and a Fourier transformation method; and finally, the characteristic values are input to a flow pattern classifier for online identification. The device and method provided by the invention can effectively prevent reduction of the conductivity measurement performance caused by polarization effects and electrochemical corrosion effects, and improve the reliability and robustness of a flow pattern identification system; furthermore, the device is simple in structure, easy to mount, low in cost and the like. The invention provides a novel effective path for measuring parameters of the gas/liquid two phases in the fields such as energy source, petrochemical industry and the like.
Description
Technical field
The present invention relates to the multiphase flow measurement field, relate in particular to a kind of non-contact conductance Identification of Gas-Liquid Two-Phase device and method.
Background technology
The gas-liquid two-phase streaming system extensively is present in industrial circles such as the energy, power, petrochemical complex.The flow pattern identification of biphase gas and liquid flow has great significance to the parameter measurement of two-phase flow system.Because the two-phase flow flow characteristics is complicated, existing flow pattern discrimination method is difficult to satisfy demand growing in the commercial Application.
It is fast to have response speed based on the Identification of Gas-Liquid Two-Phase of conductance measurement and parameter detection method, and therefore advantages such as strong interference immunity, for a long time, have received numerous researchers' in the two-phase flow field concern based on the method for conductance measurement.At present, the Flow Patterns Identification Method of Two Phase Flow based on conductance measurement commonly used mainly contains: based on the two phase flow pattern identification of ERT, based on the two phase flow pattern identification of probe-type conductance measurement, based on the two phase flow pattern identification of array multi-electrode conductance measurement etc.Yet in these traditional flow pattern discrimination methods, the conductance measurement technology that is adopted is contact type measurement.In the practical application in industry occasion, its conducting probe or potential electrode directly contact with fluid, easily by polarization and galvanic corrosion, thereby cause the performance of conductance measurement to reduce, and the reliability and the accuracy of flow pattern identification are affected.Therefore, the Flow Patterns Identification Method of Two Phase Flow based on the contact conductance measurement is difficult to satisfy the medium-term and long-term demand of using of industry.
Summary of the invention
The purpose of this invention is to provide a kind of novel, non-contact conductance Identification of Gas-Liquid Two-Phase device and method.
Non-contact conductance Identification of Gas-Liquid Two-Phase device comprises biphase gas and liquid flow measurement pipeline, ac-excited source, capacity coupling non-contact conductance sensor, temperature sensor, current/voltage-converted unit, AC rectification unit, filter unit, direct current amplifying unit, data acquisition module and computing machine; Wherein the capacity coupling non-contact conductance sensor comprises isolated pipe; Exciting electrode; Detecting electrode, inductance module and detecting electrode metallic shield; Capacity coupling non-contact conductance sensor and temperature sensor are installed on biphase gas and liquid flow and measure on the pipeline; The exciting electrode of sensor and detecting electrode are two ring electrodes; Be affixed on the outer wall of isolated pipe at interval; And the metallic shield of ground connection is installed in the detecting electrode periphery, and inductance module one end of sensor links to each other with exciting electrode through shielded conductor, and the inductance module other end of sensor links to each other with ac-excited source; Detecting electrode, current/voltage-converted unit, AC rectification unit, filter unit, direct current amplifying unit, data acquisition module, computing machine link to each other in order, and temperature sensor, data acquisition module, computing machine link to each other in order.
The step of non-contact conductance Identification of Gas-Liquid Two-Phase method is following:
1) utilize ac-excited source to produce sinusoidal voltage; Be applied on the inductance module of capacity coupling non-contact conductance sensor; The frequency in ac-excited source is transferred to resonance frequency; Make and detect the loop series resonance takes place, balance out two coupling capacitances by the induction reactance of inductance module in the sensor, one of them coupling capacitance is formed by conducting liquid, isolated pipe and exciting electrode; Another coupling capacitance forms by conducting liquid, isolated pipe with detecting electrode; On detecting electrode, obtain the directly alternating current of reflection gas-liquid two-phase fluid equivalent conductance, after the processing of current/voltage-converted unit, AC rectification unit, filter unit and direct current amplifying unit, conductance signal is collected in the computing machine by data acquisition module; Obtain the fluid temperature (F.T.) of biphase gas and liquid flow by temperature sensor, and adopt in the computing machine through data acquisition system (DAS);
2) utilize time domain statistical method and Fourier transformation method that the biphase gas and liquid flow conductance signal that is obtained is analyzed, extract mean value to every group of conductance signal
M, standard deviation
Std, low-frequency range energy distribution ratio
H 1 , Mid Frequency energy distribution ratio
H 2 With high band energy distribution ratio
H 3 Five characteristic parameters:
Mean value
M:
Standard deviation
Std:
Low-frequency range energy distribution ratio
H 1 For:
Mid Frequency energy distribution ratio
H 2 For:
High band energy distribution ratio
H 3 For:
Wherein,
U o Be the conductance signal that records by the capacity coupling non-contact conductance sensor,
E Total Be the gross energy of conductance signal,
E 1 For being distributed in the energy of 0-5Hz low-frequency range,
E 2 For being distributed in the energy of 5-25Hz Mid Frequency,
E 3 Be energy greater than the 25Hz high band;
To every group of conductance measurement signal, five characteristic parameters that obtained are formed a proper vector
t:
3) with the proper vector of being extracted
tBe input in the flow pattern sorter of setting up by SVMs, carry out the on-line identification of biphase gas and liquid flow laminar flow, wave flow, bubble flow, slug flow and five kinds of typical flow patterns of annular flow.
The present invention proposes a kind of non-contact conductance Identification of Gas-Liquid Two-Phase device and method; Can effectively avoid the phenomenon of potential electrode because of receiving polarization effect, galvanic corrosion effect to cause measurement performance to reduce; The reliability and the robustness of Identification of Gas-Liquid Two-Phase system have been improved; Have simple in structure simultaneously; Easy to implement, low cost and other advantages is for the parameter measurement of biphase gas and liquid flow in the numerous areas such as the energy, power, oil, chemical industry provides novel, a feasible valid approach.
Description of drawings
Fig. 1 is the structured flowchart of noncontact electricity gas-liquid guide two phase flow pattern device for identifying;
Fig. 2 is the job step synoptic diagram of noncontact electricity gas-liquid guide Flow Patterns Identification Method of Two Phase Flow;
Fig. 3 is the simple equivalent circuit figure of capacity coupling non-contact conductance sensor.
Embodiment
The present invention is directed to the present situation of existing contact electricity gas-liquid guide Flow Patterns Identification Method of Two Phase Flow, proposed a kind of non-contact conductance Identification of Gas-Liquid Two-Phase device and method.The conductance measurement technology that is adopted is the capacity coupling non-contact conductance measuring technique; Can effectively avoid electrode polarization and galvanic corrosion effect; Improved the performance of conductance measurement; Improved the reliability and the robustness of Identification of Gas-Liquid Two-Phase system, and have noncontact, simple in structure, be easy to install low cost and other advantages.
As shown in Figure 1; Non-contact conductance Identification of Gas-Liquid Two-Phase device comprises biphase gas and liquid flow measurement pipeline, ac-excited source, capacity coupling non-contact conductance sensor, temperature sensor, current/voltage-converted unit, AC rectification unit, filter unit, direct current amplifying unit, data acquisition module and computing machine; Wherein the capacity coupling non-contact conductance sensor comprises isolated pipe; Exciting electrode, detecting electrode, inductance module and detecting electrode metallic shield; Capacity coupling non-contact conductance sensor and temperature sensor are installed on biphase gas and liquid flow and measure on the pipeline; The exciting electrode of sensor and detecting electrode are two ring electrodes; Be affixed on the outer wall of isolated pipe at interval; And the metallic shield of ground connection is installed in the detecting electrode periphery, and inductance module one end of sensor links to each other with exciting electrode through shielded conductor, and the inductance module other end of sensor links to each other with ac-excited source; Detecting electrode, current/voltage-converted unit, AC rectification unit, filter unit, direct current amplifying unit, data acquisition module, computing machine link to each other in order, and temperature sensor, data acquisition module, computing machine link to each other in order.
In measuring process, gas-liquid two-phase flows into the measuring tube road, and flow through capacity coupling non-contact conductance sensor and temperature sensor.Obtain the alternating current of the different flow pattern therapeutic method to keep the adverse qi flowing downward liquid two-phase equivalent conductances of reflection by the capacity coupling non-contact conductance sensor, through the current/voltage-converted unit, the treatment conversion of AC rectification unit, filter unit, direct current amplifying unit is the output of direct current die mould conductance signal.Temperature by biphase gas and liquid flow in the temperature sensor measurement pipe
T, send into computing machine after utilizing data acquisition module with conductance signal, temperature signal collection and store.
As shown in Figure 2, the step of non-contact conductance Identification of Gas-Liquid Two-Phase method is following:
1) utilize ac-excited source to produce sinusoidal voltage
u In , be applied on the inductance module of capacity coupling non-contact conductance sensor, according to the principle of series resonance, the frequency in ac-excited source is transferred to resonance frequency
f 0 ,
Make and detect loop generation series resonance, by the induction reactance of inductance module in the sensor
LBalance out two coupling capacitances
C 1 With
C 2 , one of them coupling capacitance
C 1 Form another coupling capacitance by conducting liquid, isolated pipe and exciting electrode
C 2 Form by conducting liquid, isolated pipe with detecting electrode, that is:
Thereby make the resulting impedance of measuring in the loop
ZEqual the equivalent resistance part of biphase gas and liquid flow in the tested zone
R x The equivalent electrical circuit of measuring the loop is as shown in Figure 3.On detecting electrode, obtain the directly alternating current
of reflection gas-liquid two-phase fluid equivalent conductance like this; After the processing of current/voltage-converted unit, AC rectification unit, filter unit and direct current amplifying unit; By data acquisition module conductance signal is collected in the computing machine; Obtain the fluid temperature (F.T.) of biphase gas and liquid flow by temperature sensor, and adopt in the computing machine through data acquisition system (DAS);
2) utilize time domain statistical method and Fourier transformation method that the biphase gas and liquid flow conductance signal that is obtained is analyzed, extract mean value to every group of conductance signal
M, standard deviation
Std, low-frequency range energy distribution ratio
H 1 , Mid Frequency energy distribution ratio
H 2 With high band energy distribution ratio
H 3 Five characteristic parameters:
Mean value
M:
Standard deviation
Std:
Low-frequency range energy distribution ratio
H 1 For:
Mid Frequency energy distribution ratio
H 2 For:
High band energy distribution ratio
H 3 For:
Wherein,
U o Be the conductance signal that records by the capacity coupling non-contact conductance sensor,
E Total Be the gross energy of conductance signal,
E 1 For being distributed in the energy of 0-5Hz low-frequency range,
E 2 For being distributed in the energy of 5-25Hz Mid Frequency,
E 3 Be energy greater than the 25Hz high band;
To every group of conductance measurement signal, five characteristic parameters that obtained are formed a proper vector
t:
3) with the proper vector of being extracted
tBe input in the flow pattern sorter of setting up by SVMs, carry out the on-line identification of biphase gas and liquid flow laminar flow, wave flow, bubble flow, slug flow and five kinds of typical flow patterns of annular flow.
The method of " 1v1 " has been adopted in the foundation of flow pattern sorter, between per two kinds of flow patterns, sets up a two-value sorter, builds together and has found 10 sub-classifiers, and the expression formula of each sub-classifier is following:
Wherein,
---the classification logotype of flow pattern;
---the kernel function of sorter;
,
is its parameter.
Adopt " ballot method " to realize many classification problems of flow pattern then.When proper vector
is input in 10 sub-classifiers being set up; Each sorter is all differentiated; And be that corresponding flow pattern " is thrown a last ticket "; The last maximum flow pattern of number of votes obtained is current flow pattern, thereby realizes the on-line identification of flow pattern.
Be that the horizontal glass pipeline of 4.0mm is enterprising to the biphase gas and liquid flow of air and tap water formation at internal diameter has gone experiment at present; Utilize method and apparatus mentioned among the present invention; Realize the on-line identification of flow pattern of gas-liquid two-phase flow, and obtained good identification result and accuracy rate.Table 1 provides identification result and the accuracy rate under the 4.0mm caliber.
The Identification of Gas-Liquid Two-Phase result (internal diameter 4.0mm) that table 1 is measured based on non-contact conductance
| ? | Number of training | The test specimens given figure | Error sample | Recognition accuracy |
| Laminar flow | 21 | 21 | 1 | 95.2% |
| Wave flow | 22 | 21 | 2 | 90.5% |
| Bubble flow | 31 | 31 | 2 | 93.5% |
| Slug flow | 34 | 35 | 1 | 97.1% |
| Annular flow | 24 | 23 | 1 | 95.7% |
Claims (2)
1. non-contact conductance Identification of Gas-Liquid Two-Phase device; It is characterized in that comprising biphase gas and liquid flow measurement pipeline, ac-excited source, capacity coupling non-contact conductance sensor, temperature sensor, current/voltage-converted unit, AC rectification unit, filter unit, direct current amplifying unit, data acquisition module and computing machine; Wherein the capacity coupling non-contact conductance sensor comprises isolated pipe; Exciting electrode, detecting electrode, inductance module and detecting electrode metallic shield; Capacity coupling non-contact conductance sensor and temperature sensor are installed on biphase gas and liquid flow and measure on the pipeline; The exciting electrode of capacity coupling non-contact conductance sensor and detecting electrode are two ring electrodes; Be affixed on the outer wall of isolated pipe at interval; And the metallic shield of ground connection is installed in the detecting electrode periphery; Inductance module one end of capacity coupling non-contact conductance sensor links to each other with exciting electrode through shielded conductor; The inductance module other end of capacity coupling non-contact conductance sensor links to each other with ac-excited source, and detecting electrode, current/voltage-converted unit, AC rectification unit, filter unit, direct current amplifying unit, data acquisition module, computing machine link to each other in order, and temperature sensor, data acquisition module, computing machine link to each other in order.
2. non-contact conductance Identification of Gas-Liquid Two-Phase method that use is installed according to claim 1 is characterized in that its step is following:
1) utilize ac-excited source to produce sinusoidal voltage; Be applied on the inductance module of capacity coupling non-contact conductance sensor; The frequency in ac-excited source is transferred to resonance frequency; Make and detect the loop series resonance takes place, balance out two coupling capacitances by the induction reactance of inductance module in the capacity coupling non-contact conductance sensor, one of them coupling capacitance is formed by conducting liquid, isolated pipe and exciting electrode; Another coupling capacitance forms by conducting liquid, isolated pipe with detecting electrode; On detecting electrode, obtain the directly alternating current of reflection gas-liquid two-phase fluid equivalent conductance, after the processing of current/voltage-converted unit, AC rectification unit, filter unit and direct current amplifying unit, conductance signal is collected in the computing machine by data acquisition module; Obtain the fluid temperature (F.T.) of biphase gas and liquid flow by temperature sensor, and adopt in the computing machine through data acquisition module;
2) utilize time domain statistical method and Fourier transformation method that the biphase gas and liquid flow conductance signal that is obtained is analyzed, extract mean value M, standard deviation Std, low-frequency range energy distribution ratio H to every group of conductance signal
1, Mid Frequency energy distribution ratio H
2With high band energy distribution ratio H
3Five characteristic parameters:
Mean value M:
Standard deviation Std:
Low-frequency range energy distribution ratio H
1For:
Mid Frequency energy distribution ratio H
2For:
High band energy distribution ratio H
3For:
Wherein, U
oBe the conductance signal that records by the capacity coupling non-contact conductance sensor, E
TotalBe the gross energy of conductance signal, E
1For being distributed in the energy of 0-5Hz low-frequency range, E
2For being distributed in the energy of 5-25Hz Mid Frequency, E
3Be energy greater than the 25Hz high band;
To every group of conductance measurement signal, five characteristic parameters that obtained are formed a proper vector t:
t＝[M，Std，H
1，H
2，H
3]；
3) the proper vector t that is extracted is input in the flow pattern sorter of being set up by SVMs, carries out the on-line identification of biphase gas and liquid flow laminar flow, wave flow, bubble flow, slug flow and five kinds of typical flow patterns of annular flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100243372A CN102109451B (en) | 2011-01-23 | 2011-01-23 | Non-contact conductive gas/liquid two-phase flow pattern identifying device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100243372A CN102109451B (en) | 2011-01-23 | 2011-01-23 | Non-contact conductive gas/liquid two-phase flow pattern identifying device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102109451A CN102109451A (en) | 2011-06-29 |
| CN102109451B true CN102109451B (en) | 2012-06-27 |
Family
ID=44173668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100243372A Expired - Fee Related CN102109451B (en) | 2011-01-23 | 2011-01-23 | Non-contact conductive gas/liquid two-phase flow pattern identifying device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102109451B (en) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102323442B (en) * | 2011-09-07 | 2012-11-14 | 浙江大学 | Fluid flow rate and flow measurement device and method |
| CN102522831A (en) * | 2011-12-08 | 2012-06-27 | 辽宁省电力有限公司沈阳超高压分公司 | Non-contact electric field type induction power access method and power access apparatus thereof |
| CN102590030A (en) * | 2012-01-18 | 2012-07-18 | 浙江大学 | Small-passage gas-liquid phase flow pattern identification device and method based on photovoltaic array sensor |
| CN102707154B (en) * | 2012-05-24 | 2014-11-26 | 广东宝莱特医用科技股份有限公司 | Conductance sensor with electrode corrosion detection |
| CN102706534A (en) * | 2012-06-01 | 2012-10-03 | 绍兴文理学院 | Gas-liquid two-phase flow pattern recognition method |
| CN104931789A (en) * | 2015-06-26 | 2015-09-23 | 哈尔滨工业大学 | PCB-based capacitive coupling non-contact electrical conductivity detector |
| CN105426830B (en) * | 2015-11-11 | 2018-12-04 | 浙江大学 | Passage aisle flow pattern of gas-liquid two-phase flow identifying system and method based on multi-visual information integration technology |
| CN106771618A (en) * | 2016-12-19 | 2017-05-31 | 合肥铭志环境技术有限责任公司 | A kind of conductivity gauge |
| CN106959169B (en) * | 2017-04-18 | 2019-05-17 | 上海交通大学 | A kind of novel and multifunctional sensor chip and preparation method thereof |
| CN109557168B (en) * | 2018-11-27 | 2023-01-24 | 河南师范大学 | Anti-interference high-sensitivity gas-liquid two-phase flow phase content detection method |
| CN109541286B (en) * | 2018-12-27 | 2020-11-03 | 方圆广电检验检测股份有限公司 | Contact current detection method and tester |
| CN110243876B (en) * | 2019-06-25 | 2020-11-10 | 西安交通大学 | Conductivity sensor for transient measurement of gas-liquid two-phase flow gas content |
| CN110487163B (en) * | 2019-07-04 | 2020-09-08 | 重庆大学 | Instantaneous conductance measurement system for thickness of gas-liquid two-phase annular flow liquid film in local area of rod bundle channel |
| CN111551594B (en) * | 2020-05-28 | 2024-01-26 | 微泰医疗器械(杭州)股份有限公司 | Detection object concentration monitoring circuit, detection object concentration monitoring system and terminal equipment |
| CN111999572B (en) * | 2020-06-22 | 2023-03-31 | 重庆大学 | Interval capacitive sensor-based multi-parameter online monitoring device and method for gas-liquid two-phase fluid of power equipment |
| CN111751625B (en) * | 2020-06-29 | 2021-04-06 | 浙江大学 | Non-contact conductivity measuring device and method based on LC circuit |
| CN112834571B (en) * | 2020-12-30 | 2023-07-21 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Gas-liquid two-phase detection device and method based on separate excitation type piezoelectric element |
| CN113203793B (en) * | 2021-04-29 | 2023-07-25 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Voice coil element-based gas-liquid two-phase detection device and method |
| CN113984839A (en) * | 2021-11-02 | 2022-01-28 | 上海交通大学 | Novel capacitive silk screen sensor for high-conductivity fluid measurement |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5005401A (en) * | 1990-02-12 | 1991-04-09 | Hughes Aircraft Company | Noncontact on-line measurement of the viscosity of liquid paint |
| CN101231259B (en) * | 2008-01-31 | 2012-05-02 | 浙江大学 | Oil-water two-phase flow dominant phase discriminating device and method |
-
2011
- 2011-01-23 CN CN2011100243372A patent/CN102109451B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN102109451A (en) | 2011-06-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102109451B (en) | Non-contact conductive gas/liquid two-phase flow pattern identifying device and method | |
| CN101609113B (en) | Non-contact conductivity measuring device based on double shield structure and acceptor resonance and method thereof | |
| CN101387613A (en) | Capacity coupling non-contact conductance measuring device based on series resonance and method | |
| CN102323442B (en) | Fluid flow rate and flow measurement device and method | |
| CN103257182B (en) | A kind of impulse eddy current defect quantitative detection method and detection system | |
| CN102735992B (en) | Surface potential pilot frequency comparison-based ground grid defect identification method and system | |
| CN104155471A (en) | Multiphase flow testing method based on cross-correlation velocity measurement of ultrasonic and electric multiple sensors | |
| CN104089985A (en) | Visual multiphase flow test method based on electric and ultrasonic sensing principle | |
| CN102323302B (en) | Non-contact electrical resistance tomography data acquisition device and method | |
| CN104198537A (en) | Method and device for detecting moisture content and electric conductivity of soil | |
| CN1300576C (en) | Analyzer for analyzing moisture in ground conductance | |
| CN104155358A (en) | Visual multiphase flow testing device with combination of ultrasonic Doppler and electrical sensor | |
| CN104090020A (en) | Electric and ultrasonic-based bimodal multiphase flow measuring device | |
| CN104316720A (en) | Charging sensing online dust detecting device for self-adaption flow velocity change and method thereof | |
| CN103941099B (en) | Capacity coupling non-contact conductance measurement apparatus based on virtual inductor and method thereof | |
| CN102375024B (en) | Device and method for measuring phase fraction of two-phase fraction | |
| CN205080193U (en) | Non -contact fluid impedance measurement device based on annular structure | |
| CN102914568A (en) | Soil moisture sensor with replaceable probe and measuring method of soil moisture sensor | |
| CN202209964U (en) | Flow velocity and flow rate measuring device for fluid | |
| CN104777196A (en) | Device for real-time measurement of fluid conductivity by use of electromagnetic method | |
| CN102360025A (en) | Device and method for measuring flow velocity and flow quantity of fluid in small flow passage | |
| CN104459333A (en) | Industrial capacitive coupling type double inductance structure non-contacting conductance measuring device and method | |
| CN102645553B (en) | Fluid flow speed and flow measuring device and method | |
| CN104077455B (en) | Method for optimizing size of key part of two-phase-flow annular space lumped sensing system | |
| CN202204828U (en) | Device for measuring flow velocity and flow rate of fluid in small channel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120627 Termination date: 20180123 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |