CN105891607A - Radial structure non-contact type fluid electrical conductivity measurement device and method - Google Patents
Radial structure non-contact type fluid electrical conductivity measurement device and method Download PDFInfo
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- CN105891607A CN105891607A CN201510746672.1A CN201510746672A CN105891607A CN 105891607 A CN105891607 A CN 105891607A CN 201510746672 A CN201510746672 A CN 201510746672A CN 105891607 A CN105891607 A CN 105891607A
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Abstract
The invention discloses a radial two electrode sensor-based non-contact type fluid electrical conductivity measurement device and method. The non-contact type fluid electrical conductivity measurement device comprises an alternating current excitation source, a radial two electrode sensor, a metal shielding cover, an electric inductance module, a signal processing module, a data acquisition module and a microcomputer. The sensor comprises an insulating pipeline and two concave metal electrodes. The metal electrodes are radially symmetrically distributed on an outer wall of the insulating pipeline, and one of the metal electrodes is an excitation electrode and the other one is a detection electrode. The metal shielding cover is arranged around the sensor and is used for shielding external electromagnetic interference. Unfavorable influence exerted on electrical conductivity measurement by a coupling capacitor can be eliminated via introduction of a series harmonic resonance principle, electrical conductivity measurement sensitivity can be increased, and a measurement scope of an electrical conductivity measurement application can be extended. The radial structure non-contact type fluid electrical conductivity measurement device is advantaged by small sensor size, simple and compact structure and the like; a non-contact measurement mode is adopted; flowing of fluid in the pipeline cannot be affected, and problems of electrode polarization, corrosion and the like in contact type electrical conductivity measurement can be effectively overcome.
Description
Technical field
The present invention relates to fluid conductance measurement technology, particularly relate to a kind of based on radially two electrode sensors non-
The method of contact fluid conductance measurement.
Background technology
Liquid-phase system in pipeline is widely present in metallurgy, chemical engineering, biological medicine, environmental conservation and dirt
During the research and production of the departments such as water process, conductance is one of basic physical properties parameter of fluid, conductance
On-line checking other characterisitic parameters of fluid in analysis conduit are had important effect, as concentration, component,
Chemical reaction rate etc..A lot of Wuli-Shili-Renli system approach differences just because of fluid all can be reflected as its conductance
Change, so the on-line measurement of fluid conductance is producing and is having a wide range of applications scope in scientific research in pipeline
With important Research Significance.
The method of Conductivity detection is all based on greatly contact Conductivity detection technology, due to detecting electrode and stream at present
Body directly contacts, and electrochemical reaction, polarity effect easily occur.Survey in the case of this external measurement ring border is poor
Amount electrode easily tarnishes, and causes conductance measurement hydraulic performance decline.Capacity coupling non-contact conductance technology (C4D),
Being the most novel a kind of Conductivity detection technology, typical sensor construction is insulation tube outer wall axial distribution
Two ring electrodes.Owing to it has electrode and the discontiguous advantage of detected fluid, therefore obtain research-on-research
Person and the extensive concern of engineer.
But, the sensor structure is the loosest, takes up room more, is unfavorable for the actual application of industry.
The present invention is directed to the current situation of fluid Conductivity detection, it is proposed that a kind of based on radially two electrode sensors non-
Contact fluid conductivity measuring device and method, Sensor section uses two concave metal electrode slices the most right
Claim to be affixed on insulation tube outer wall, one as exciting electrode, another is as detecting electrode.Simplify sensor
Structure, distribution of electrodes mode is the compactest, and overcomes electrochemical corrosion, pole that touch sensor exists
Change the problems such as effect, the method being simultaneously introduced series resonance, reduce the impact of coupling electric capacity, improve system
Detection sensitivity and the scope of measurement.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that high non-of a kind of simple in construction, resolution
Contact fluid conductivity measuring device and method.Concrete technical scheme is as follows:
A kind of contactless fluid conductivity measuring device based on radially two electrode sensors, including ac-excited
Source, radially two electrode sensors, inductor module, signal processing module, data acquisition module, computer；
Ac-excited source is connected with one end of inductor module, the other end of inductor module and radially two electrode sensors
Pumping signal input be connected, the radially detection signal output part of two electrode sensors and signal processing module
One end be connected, signal processing module, data acquisition module, computer are sequentially connected.
As preferably, described radial direction two electrode sensor is by metallic shield, exciting electrode, detecting electrode
Forming with isolated pipe, two electrode slices are equivalently-sized, for radial direction spill electrode, are right in isolated pipe both sides
Claiming distribution, exciting electrode is drawn pumping signal input and inductor module phase by the wire through metallic shield
Even, detecting electrode is drawn detection signal output part and signal processing module phase by the wire through metallic shield
Even, metallic shield ground connection.
A kind of fluid method for measuring conductance using described device, its step is as follows:
1) for the conductor fluid in isolated pipe, the equivalent model of this radial direction two electrode sensor is: excitation
Electrode couples electric capacity C with the conductor fluid in isolated pipe by tube wall formationx1, two electrodes in isolated pipe
Between conductor fluid equivalence become resistance R0, tube wall shape that conductor fluid in detecting electrode and isolated pipe passes through
Become coupling electric capacity Cx2；
2) equiva lent impedance of testing circuit isWherein, f is ac-excited
The driving voltage u in sourceiFrequency, L is the inductance value of inductor module；The driving voltage u in ac-excited source is seti
Resonant frequency f that frequency f is Conductivity detection circuit0, whereinAt this ac-excited letter
Number effect under, the imaginary part in the equiva lent impedance of testing circuit is eliminated, and whole testing circuit is in resonance shape
State, i.e. circuit equivalent impedance Z=R0；
3) signal processing module is obtained the electric current i of sensor output0Carry out current/voltage conversion, filter, put
Big process can obtain effective signal, and owing to circuit is in resonant condition, circuit is purely resistive, Z=R0；
Pass through relational expressionThe equivalent conductance of fluid can be calculated.
The present invention compared with prior art has a beneficial effect:
1) metering system is contactless, electrode is not directly contacted with fluid in pipeline, it is to avoid electrode is flowed
The problems such as the corrosion of body and electrode polarization, non-contact measurement does not destroy fluids within pipes flow regime simultaneously,
Decrease the pressure loss；
2) radially two electrode non-contact electric conductivity sensors are used to obtain the electric current i in Conductivity detection circuit0,
Simplifying the structure of conductivity measuring device, under the conditions of identical caliber, its volume is about conventional circular electrode sensing
/ 3rd of device, reduce sensor and take up room, it is easy to accomplish the miniaturization of conductivity measuring device, reality
With change；
3) place the isolated pipe equipped with electrode part in metallic shield, can effectively reduce the dry of surrounding
Disturb signal, be conducive to improving the resolution of detection, and improve stability and the capacity of resisting disturbance of device；
4) method applying series resonance, eliminates coupling electric capacity and causes measurement scope and resolution not
Profit impact, improves the resolution of conductance measurement, increases non-contact electric conductivity and measures the caliber yardstick of application.
Accompanying drawing explanation
Fig. 1 is structural representation based on radially two electrode sensors contactless fluid conductivity measuring device；
Fig. 2 is the structural representation of radially two electrode sensors；
Fig. 3 is sensor equivalent circuit model schematic；
Fig. 4 is conductive detection device equivalent circuit diagram of the present invention；
In figure: ac-excited source 1, metallic shield 2, exciting electrode 3, detecting electrode 4, isolated pipe 5,
Inductor module 6, signal processing module 7, data acquisition module 8, computer 9, radially two electrode sensors
10。
Detailed description of the invention
As it is shown in figure 1, a kind of contactless fluid conductivity measuring device based on radially two electrode sensors,
Including ac-excited source 1, radially two electrode sensors 10, inductor module 6, signal processing module 7, data
Acquisition module 8, computer 9；Ac-excited source 1 is connected with one end of inductor module 6, inductor module 6
The other end be connected with the pumping signal input of radially two electrode sensors 10, radially two electrode sensor 10
Detection signal output part be connected with one end of signal processing module 7, signal processing module 7, data acquisition module
Block 8, computer 9 are sequentially connected.
As in figure 2 it is shown, described radial direction two electrode sensor is by metallic shield 2, exciting electrode 3, detection
Electrode 4 and isolated pipe 5 form, and two electrode slices are equivalently-sized, for radial direction spill electrode, in isolated pipe 5
Both sides are symmetric, and exciting electrode 3 is drawn pumping signal input by the wire through metallic shield 2
Being connected with inductor module 6, detecting electrode 4 is drawn detection signal output by the wire through metallic shield 2
End is connected with signal processing module 7, metallic shield 2 ground connection.
The flow process utilizing these apparatus and method to measure fluid conductance is: ac-excited source 1 output AC voltage is believed
Number frequency be resonant frequency, ac voltage signal is added on exciting electrode 3 by inductor module 6, in inspection
The current signal that survey electrode 4 obtains is processed by signal processing module 7, will by data acquisition module 8
The voltage signal of output is transferred on computer 9 and shows.
As it is shown on figure 3, sensor equivalent circuit model is: exciting electrode 3 and the conduction in isolated pipe 5
Fluid forms coupling electric capacity C by tube wallx1, interior two the interelectrode conductor fluid equivalences of isolated pipe 5 become electricity
Resistance R0, the tube wall that detecting electrode 4 passes through with the conductor fluid in isolated pipe 5 is formed and couples electric capacity Cx2。
As shown in Figure 4, the Conductivity detection equivalent circuit of fluid conductivity measuring device is: ac-excited source 1
What one end was formed with the conductor fluid in exciting electrode 3 and isolated pipe 5 first couples electric capacity Cx1One end
It is connected, the first coupling electric capacity Cx1The other end and exciting electrode 3 and detecting electrode 4 between conductor fluid
Equivalent resistance R0One end connect, equivalent resistance R0The other end and detecting electrode 4 and isolated pipe 5 in
The second coupling electric capacity C that conductor fluid is formedx2One end connect, the second coupling other end of electric capacity and inductance
One end of L is connected, and the current signal of reflection fluid equivalent conductance is exported data and processes by the other end of inductance L
Module.
A kind of fluid method for measuring conductance using described device, its step is as follows:
1) for the conductor fluid in isolated pipe, the equivalent model of this radial direction two electrode sensor is: excitation
Electrode 3 couples electric capacity C with the conductor fluid in isolated pipe 5 by tube wall formationx1, in isolated pipe 5 two
Individual interelectrode conductor fluid equivalence becomes resistance R0, detecting electrode 4 leads to the conductor fluid in isolated pipe 5
The tube wall crossed forms coupling electric capacity Cx2；
2) equiva lent impedance of testing circuit isWherein, f is ac-excited
The driving voltage u in source 1iFrequency, L is the inductance value of inductor module 6；The excitation in ac-excited source 1 is set
Voltage uiResonant frequency f that frequency f is Conductivity detection circuit0, whereinSwash in this exchange
Encouraging under the effect of signal, the imaginary part in the equiva lent impedance of testing circuit is eliminated, and whole testing circuit is in humorous
Shake state, i.e. circuit equivalent impedance Z=R0；
3) signal processing module 7 is obtained the electric current i of sensor output0Carry out current/voltage conversion, filtering,
Processing and amplifying i.e. can get effective signal, and owing to circuit is in resonant condition, circuit is purely resistive, Z=R0；
Pass through relational expressionThe equivalent conductance of fluid can be calculated.
On the horizontal Lucite pipe of different tube diameters to the present invention in mentioned apparatus and method carry out
Preliminary test, demonstrates the feasibility of the present invention.Test medium is the KCL solution of variable concentrations, its ginseng
Examine electrical conductivity by business type conductivity type contact instrument (prunus mume (sieb.) sieb.et zucc. Teller-torr benefit FE30-FiveEasyTM) measure, electricity
The excursion of conductance is 0.01mS/cm-100mS/cm.And under the conditions of identical caliber, the present invention mentions
The space that takies of radial structure sensor be about 1/3rd of conventional circular electrode sensor.Result of the test
Showing: utilize apparatus and method mentioned in the present invention, conductivity measurement maximum relative error is less than 5%,
The measurement of electrical conductivity to single-phase conductor fluid can be realized, and obtain preferable measurement result.
Claims (3)
1. a contactless fluid conductivity measuring device based on radially two electrode sensors, it is characterised in that
Including ac-excited source (1), radially two electrode sensors (10), inductor module (6), signal processing module
(7), data acquisition module (8), computer (9)；Ac-excited source (1) and inductor module (6)
One end is connected, and the other end of inductor module (6) is defeated with the pumping signal of radially two electrode sensors (10)
Enter end to be connected, radially the detection signal output part of two electrode sensors (10) and signal processing module (7)
One end is connected, and signal processing module (7), data acquisition module (8), computer (9) are sequentially connected.
Contactless fluid conductance measurement based on radially two electrode sensors the most according to claim 1
Device, it is characterised in that described radial direction two electrode sensor by metallic shield (2), exciting electrode (3),
Detecting electrode (4) and isolated pipe (5) composition, two electrode slices are equivalently-sized, for radial direction spill electrode,
Being symmetric in isolated pipe (5) both sides, exciting electrode (3) is by leading through metallic shield (2)
Line is drawn pumping signal input and is connected with inductor module (6), and detecting electrode (4) is by through metallic shield
The wire of cover (2) is drawn detection signal output part and is connected with signal processing module (7), metallic shield (2)
Ground connection.
3. the fluid method for measuring conductance using device as claimed in claim 1, it is characterised in that it
Step is as follows:
1) for the conductor fluid in isolated pipe, the equivalent model of this radial direction two electrode sensor is: excitation
Electrode (3) couples electric capacity C with the conductor fluid in isolated pipe (5) by tube wall formationx1, isolated pipe
(5) interior two interelectrode conductor fluid equivalences become resistance R0, detecting electrode (4) and isolated pipe (5)
The tube wall that interior conductor fluid passes through forms coupling electric capacity Cx2；
2) equiva lent impedance of testing circuit isWherein, f is ac-excited
The driving voltage u in source (1)iFrequency, L is the inductance value of inductor module (6)；Ac-excited source (1) is set
Driving voltage uiResonant frequency f that frequency f is Conductivity detection circuit0, whereinAt this
Under the effect of ac-excited signal, the imaginary part in the equiva lent impedance of testing circuit is eliminated, whole testing circuit
It is in resonant condition, i.e. circuit equivalent impedance Z=R0；
3) signal processing module (7) is obtained the electric current i of sensor output0Carry out current/voltage conversion, filtering,
Processing and amplifying i.e. can get effective signal, and owing to circuit is in resonant condition, circuit is purely resistive, Z=R0；
Pass through relational expressionThe equivalent conductance of fluid can be calculated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510746672.1A CN105891607A (en) | 2015-11-04 | 2015-11-04 | Radial structure non-contact type fluid electrical conductivity measurement device and method |
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| CN201510746672.1A CN105891607A (en) | 2015-11-04 | 2015-11-04 | Radial structure non-contact type fluid electrical conductivity measurement device and method |
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| CN105891607A true CN105891607A (en) | 2016-08-24 |
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| CN201510746672.1A Pending CN105891607A (en) | 2015-11-04 | 2015-11-04 | Radial structure non-contact type fluid electrical conductivity measurement device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110954577A (en) * | 2019-12-18 | 2020-04-03 | 兰州大学 | Rapid nondestructive injection quality detection system and detection method |
| CN111751625A (en) * | 2020-06-29 | 2020-10-09 | 浙江大学 | Non-contact conductivity measuring device and method based on LC circuit |
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| CN101609113A (en) * | 2009-06-11 | 2009-12-23 | 浙江大学 | Non-contact conductivity measuring device and method based on double shield structure and series resonance |
| CN103941099A (en) * | 2014-04-17 | 2014-07-23 | 浙江大学 | Capacitive coupling type non-contact electric conductance measurement device and method based on virtual inductor |
| CN205120837U (en) * | 2015-11-04 | 2016-03-30 | 浙江大学 | Non -contact fluid electric conductance measuring device of radial structure |
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2015
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101609113A (en) * | 2009-06-11 | 2009-12-23 | 浙江大学 | Non-contact conductivity measuring device and method based on double shield structure and series resonance |
| CN103941099A (en) * | 2014-04-17 | 2014-07-23 | 浙江大学 | Capacitive coupling type non-contact electric conductance measurement device and method based on virtual inductor |
| CN205120837U (en) * | 2015-11-04 | 2016-03-30 | 浙江大学 | Non -contact fluid electric conductance measuring device of radial structure |
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| M.SAMI A.ABOUELWAFA等: "The Use of Capacitance Sensors for Phase Percentage Determination in Multiphase Pipelines", 《IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT》 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110954577A (en) * | 2019-12-18 | 2020-04-03 | 兰州大学 | Rapid nondestructive injection quality detection system and detection method |
| CN110954577B (en) * | 2019-12-18 | 2023-08-18 | 兰州大学 | Rapid nondestructive injection quality detection system and detection method |
| CN111751625A (en) * | 2020-06-29 | 2020-10-09 | 浙江大学 | Non-contact conductivity measuring device and method based on LC circuit |
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Application publication date: 20160824 |