CN112378980A - Correction system and method for silk screen probe concentration detection device - Google Patents

Correction system and method for silk screen probe concentration detection device Download PDF

Info

Publication number
CN112378980A
CN112378980A CN202011264170.2A CN202011264170A CN112378980A CN 112378980 A CN112378980 A CN 112378980A CN 202011264170 A CN202011264170 A CN 202011264170A CN 112378980 A CN112378980 A CN 112378980A
Authority
CN
China
Prior art keywords
conductivity
probe concentration
detection device
silk screen
solution
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.)
Granted
Application number
CN202011264170.2A
Other languages
Chinese (zh)
Other versions
CN112378980B (en
Inventor
顾汉洋
刘莉
张琦
张嘉荣
刘帅
曾陈
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Jiaotong University
Original Assignee
Shanghai Jiaotong University
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shanghai Jiaotong University filed Critical Shanghai Jiaotong University
Priority to CN202011264170.2A priority Critical patent/CN112378980B/en
Publication of CN112378980A publication Critical patent/CN112378980A/en
Application granted granted Critical
Publication of CN112378980B publication Critical patent/CN112378980B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/416—Systems
    • G01N27/4163—Systems checking the operation of, or calibrating, the measuring apparatus

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Molecular Biology (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

The invention provides a correction system and a correction method for a silk screen probe concentration detection device. The device comprises a water bath thermostat, an upper end enclosure, a lower end enclosure, a standard conductivity meter and a silk screen probe concentration detection device, wherein the silk screen probe concentration detection device is clamped between the upper end enclosure and the lower end enclosure, and the upper end enclosure and the lower end enclosure are fixed through flanges to form a sealed container for containing a measurement solution; the standard conductivity meter is used for detecting the concentration of the measurement solution in the sealed container; the sealed container is arranged in a water bath thermostat, and the water bath thermostat regulates the temperature in the sealed container. The invention compares the conductivity of the standard measuring solution with the conductivity measured by the silk screen probe to obtain the conductivity correction relational expression of each electrode of the silk screen probe. And adjusting the temperature of the water bath, measuring the conductivity under different temperature conditions, and obtaining a temperature correction relational expression of the silk screen probe concentration detection device. The calibrated device can directly measure the concentration of the measurement solution.

Description

Correction system and method for silk screen probe concentration detection device
Technical Field
The invention relates to the fields of engineering hydrodynamics, environmental hydraulics, signal and information processing, in particular to a correction system and a method of a silk screen probe concentration detection device.
Background
The accurate measurement of the single-phase fluid concentration has important significance in the fields of engineering hydrodynamics, reactor thermal hydraulic power, environmental hydraulics and the like. A silk screen probe is an advanced measuring device that is easy to install and operate, and several electrodes are formed by arranging two layers of stainless steel wires perpendicular to each other without contact. The diameter of the stainless steel wire is generally between 0.02 mm and 0.1mm, and the interference on the measured flow field can be ignored. Each layer of electrodes in the silk screen probe are compactly arranged, and information such as local conductivity, void fraction and the like is obtained by analyzing electric signals of each electrode, so that the full-section measurement of a flow field can be realized. At present, a commonly used silk screen probe main body is a PCB, and a stainless steel wire is welded on the PCB in a soldering mode. However, because the positions of the electrodes on the PCB are different, the distances from the stainless steel wires corresponding to the electrodes to the power supply are also different. Therefore, even in the same flow field, there is a certain difference in the electrical signals generated by the electrodes at different positions on the same PCB. Furthermore, the conductivity of the salt solution is significantly affected by temperature changes. Taking KCl solution as an example, the conductivity of the solution is increased by 5-10% for every 5 ℃ rise of the temperature. Therefore, it is necessary to design a special calibration system to calibrate the concentration measuring instrument of the silk screen probe, so that the concentration distribution of the salt solution under different temperature conditions can be accurately measured.
Disclosure of Invention
In view of the defects in the prior art, the present invention provides a calibration system and method for a silk screen probe concentration detection device.
The correction system of the silk screen probe concentration detection device provided by the invention comprises a water bath thermostat, an upper end enclosure, a lower end enclosure, a standard conductivity meter and the silk screen probe concentration detection device, wherein:
the silk screen probe concentration detection device is clamped between the upper end enclosure and the lower end enclosure, and the upper end enclosure and the lower end enclosure are fixed through flanges to form a sealed container for containing a measurement solution;
the standard conductivity meter is used for detecting the concentration of the measurement solution in the sealed container;
the sealed container is arranged in a water bath thermostat, and the water bath thermostat regulates the temperature in the sealed container.
Preferably, an insulating gasket is arranged between the silk screen probe concentration detection device and the upper end enclosure and between the silk screen probe concentration detection device and the lower end enclosure.
Preferably, the water bath incubator comprises an electrical heating rod for heating and/or a cooling tube for cooling.
Preferably, the upper sealing head is provided with an opening, and a measuring solution is injected through the opening.
Preferably, the device further comprises a temperature detection device for detecting the temperature of the measurement solution.
According to the calibration method of the silk screen probe concentration detection device based on the calibration system of the silk screen probe concentration detection device, provided by the invention, the calibration method comprises the following steps:
step S1: pouring the measuring solution with known concentration into a sealed container, adjusting the temperature of a water bath thermostat and recording, and measuring and recording the conductivity of the measuring solution by using a standard conductivity meter;
step S2: changing the concentration of the measured solution, and recording current signals of all electrodes of the standard conductivity meter and the silk screen probe concentration detection device;
step S3: and changing the temperature of the water bath incubator, and recording current signals of all electrodes of the standard conductivity meter and the silk screen probe concentration detection device.
Preferably, in step S2, the current signal I measured by the silk-screen probe concentration detection device is recorded, and the current signal I is converted into a conductivity signal: kWMSIL/UA, where L is the spacing of the electrodes, U is the voltage value, and a is the cross-sectional area of the electrodes.
Preferably, in step S2, the readings measured by the standard conductivity meter and the silk screen probe concentration detecting device under different concentration measuring solutions are measured, and the reading measured by the silk screen probe concentration detecting device is corrected to the standard reading by using the correction formula: kst＝a*KWMS+ b, where a, b represent correction coefficients.
Preferably, in step S1, the conductivity of the measured solution with a concentration of 0.001-0.2 mg is measured by a standard conductivity meter, and the relationship between the conductivity and the concentration is fitted according to the variation characteristics of the conductivity: 1) if the conductivity of the measured solution increases linearly with increasing concentration, the fit relationship is of the form: c ═ a × Kst+ b; 2) if the conductivity of the measured solution does not increase linearly with increasing concentration, the fit relationship is of the form:
Figure BDA0002775589840000021
wherein a, a1、a2And b represents a constant.
Preferably, in step S3, the conductivity of the measured solution is measured by a standard conductivity meter within the range of 0-60 ℃, and a corrected relation of the conductivity with the temperature change is fitted: kst＝KC/[1+a(T-25)]In which K isCIn order to measure the conductivity value of the solution at the temperature T ℃, T is the temperature of the solution at the time of measurement, a is the temperature coefficient of the ionic conductivity of the salt, and the reference value is 0.022.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention has reasonable structure and ingenious design, and realizes the correction of the concentration detection device of the silk screen probe;
2. the constant-temperature water tank is adopted, so that the temperature can be quickly adjusted;
3. the invention ensures the correction accuracy of the correction device by measuring the conductivity and adjusting the correction relation, and the corrected device can directly measure the concentration of the measured solution.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic diagram of a silk screen probe.
Fig. 2 is a schematic diagram of a screen probe calibration system.
Fig. 3 is a graphical representation of the conductivity measurements of a silk screen probe compared to a standard conductivity meter.
FIG. 4 is a graphical representation of a conductivity-concentration fit based on standard conductivity meter measurements at low concentrations.
FIG. 5 is a graphical representation of a conductivity-concentration fit based on standard conductivity meter measurements at high concentrations.
Fig. 6 is a schematic diagram showing the effect of temperature change on the conductivity measured based on a standard conductivity meter.
The figures show that:
water bath incubator 1
Upper end enclosure 2
Lower end socket 3
Upper head flange 4
Lower seal head flange 5
Silk screen probe conductivity meter 6
VGA socket 7
Insulating spacer 8
KCI solution 9
Deionized water 10
Spiral cooling pipe 11
Electrical heating rod 12
Mixer 13
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
With reference to fig. 1, the main body of the silk screen probe is a PCB, and the partial area of the PCB is hollowed out to serve as a fluid flow channel. Two groups of stainless steel wires which are perpendicular to each other but not in contact are respectively welded on the front surface and the back surface of the PCB, one group of stainless steel wires is used as a signal emitting electrode, and the other group of stainless steel wires is used as a signal receiving electrode. The crossed position of the two layers of stainless steel wires forms an electrode, and a current signal generated after the power supply is switched on is processed by a signal amplifier and then is received by a sampling holding circuit. Wherein the current signal received by the receiver electrode is related to the conductivity of the solution between the electrodes.
Referring to fig. 2, the upper head and the lower head are made of a metal material having good thermal conductivity, so that the temperature of the KCl solution can be rapidly adjusted. And clamping the silk screen probe between the upper seal head and the lower seal head and fixing the silk screen probe through a flange, thereby forming a large-space container. The silk screen probe is insulated from the upper end socket and the lower end socket through insulating gaskets, so that the acquisition of interference current signals is avoided. A KCl solution of a certain concentration was poured into the container through the small hole at the top of the upper head while all the electrodes of the wire mesh probe were immersed.
With reference to fig. 2, the container containing the KCl solution was placed in a water bath incubator, and the fluid in the water bath incubator was deionized water. The water temperature in the water tank is adjusted through the spiral cooling pipe and the electric heating rod, and the bottom of the water tank is also provided with the stirring device, so that the water temperature in the water tank is ensured to be uniformly distributed. After the water temperature of the water bath thermostat is adjusted to a certain range, an acquisition system of the silk screen probe is started and current signals of all the electrodes are recorded. Meanwhile, a probe of a standard conductivity meter is placed in a small hole of the upper end socket, and the standard conductivity of the KCl solution is measured. In addition, a T-shaped thermocouple is placed in a small hole of the upper end socket, and the temperature of the KCl solution is measured. The above operations are repeated to obtain current signals and standard conductivity values under different concentration and temperature conditions.
Recording silk screen probe concentration detection device's current signal I when detecting, convert the current signal into the conductivity signal: kWMSIL/UA, where L is the spacing of the electrodes, U is the voltage value, and a is the cross-sectional area of the electrodes. The electrical signal I (x, y) varies from electrode to electrode due to differences between the electrodes. And obtaining the conductivity corresponding to each electrode through the relationship between the conductivity and the current signal:
KWMS(x,y)＝I(x,y)L/A
wherein (x, y) is the number of the wire mesh probe electrode.
Referring to fig. 3, the conductivity acquired by each electrode in the silk screen probe has a certain difference, and each electrode is corrected by the standard conductivity measured synchronously. Each electrode has its own correction factor:
Kst(x,y)＝a(x,y)*KWMS(x,y)+b(x,y)
with reference to FIGS. 4 and 5, KCl solution concentration C and standard conductivity K were fitted at 25 deg.CstThe relational expression (c) of (c). When the concentration range is 0.001-0.02 mg, the form of the fitting relation is as follows:
C＝a*Kst+b
when the concentration range is 0.02-0.2 mg, the fitting relation form is as follows:
Figure BDA0002775589840000051
with reference to fig. 6, the conductivity of the KCl solution is greatly affected by temperature, and when the measured temperature of the KCl solution is not 25 ℃, the conductivity is corrected by the correction relation of the temperature:
Kst＝KC/[1+a(T-25)]
in the formula, KCIn order to measure the conductivity value of the solution at the temperature T ℃, T is the temperature of the solution at the time of measurement, a is the temperature coefficient of the ionic conductivity of the salt, and the reference value is 0.022.
And compiling a post-treatment program through the relational expression, and directly converting the current signal acquired by the silk screen probe into the concentration of the KCl solution. The writer is no longer specifically expanded because the correction relation is known.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims (10)

1. The utility model provides a silk screen probe concentration detection device's correction system, its characterized in that, includes water bath thermostated container, upper cover, low head, standard conductivity appearance and silk screen probe concentration detection device, wherein:
the silk screen probe concentration detection device is clamped between the upper end enclosure and the lower end enclosure, and the upper end enclosure and the lower end enclosure are fixed through flanges to form a sealed container for containing a measurement solution;
the standard conductivity meter is used for detecting the concentration of the measurement solution in the sealed container;
the sealed container is arranged in a water bath thermostat, and the water bath thermostat regulates the temperature in the sealed container.
2. The calibration system for the screen mesh probe concentration detection device according to claim 1, wherein an insulating gasket is disposed between the screen mesh probe concentration detection device and the upper end enclosure and between the screen mesh probe concentration detection device and the lower end enclosure.
3. The calibration system for the wire mesh probe concentration detection device according to claim 1, wherein the water bath incubator comprises an electric heating rod for heating and/or a cooling tube for cooling.
4. The calibration system for the silk screen probe concentration detection device of claim 1, wherein the upper head is provided with an opening through which a measurement solution is injected.
5. The calibration system for the screen probe concentration detecting device according to claim 1, further comprising a temperature detecting device for detecting a temperature of the measurement solution.
6. A calibration method for a screen probe concentration detecting apparatus based on the calibration system for a screen probe concentration detecting apparatus according to any one of claims 1 to 5, comprising the steps of:
step S1: pouring the measuring solution with known concentration into a sealed container, adjusting the temperature of a water bath thermostat and recording, and measuring and recording the conductivity of the measuring solution by using a standard conductivity meter;
step S2: changing the concentration of the measured solution, and recording current signals of all electrodes of the standard conductivity meter and the silk screen probe concentration detection device;
step S3: and changing the temperature of the water bath incubator, and recording current signals of all electrodes of the standard conductivity meter and the silk screen probe concentration detection device.
7. The calibration method for the screen probe concentration detecting device of claim 6, wherein in the step S2, the current signal I measured by the screen probe concentration detecting device is recorded, and the current signal I is converted into a conductivity signal: kWMSIL/UA, where L is the spacing of the electrodes, U is the voltage value, and a is the cross-sectional area of the electrodes.
8. The calibration method for the screen probe concentration detecting device according to claim 7, wherein in the step S2, the readings measured by the standard conductivity meter and the screen probe concentration detecting device under different concentration measurement solutions are measured, and the reading measured by the screen probe concentration detecting device is corrected to the standard reading by using a correction formula: kst＝a*KWMS+ b, where a, b represent correction coefficients.
9. The calibration method for the silk screen probe concentration detection device of claim 6, wherein in step S1, the conductivity of the solution with the concentration of 0.001-0.2 mg is measured by a standard conductivity meter, and the relationship between the conductivity and the concentration is fitted according to the variation characteristics of the conductivity: 1) if the conductivity of the measured solution increases linearly with increasing concentration, the fit relationship is of the form: c ═ a × Kst+ b; 2) if the measuring solution is dissolvedThe conductivity of the fluid does not increase linearly with increasing concentration, and the fit relationship is of the form:
Figure FDA0002775589830000021
wherein a, a1、a2And b represents a constant.
10. The calibration method for the silk screen probe concentration detection device of claim 6, wherein in step S3, the conductivity of the measured solution is measured in the range of 0-60 ℃ by using a standard conductivity meter, and a corrected relation of the conductivity with the temperature change is fitted: kst＝KC/[1+a(T-25)]In which K isCIn order to measure the conductivity value of the solution at the temperature T ℃, T is the temperature of the solution at the time of measurement, a is the temperature coefficient of the ionic conductivity of the salt, and the reference value is 0.022.
CN202011264170.2A 2020-11-12 2020-11-12 Correction system and method for silk screen probe concentration detection device Active CN112378980B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011264170.2A CN112378980B (en) 2020-11-12 2020-11-12 Correction system and method for silk screen probe concentration detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011264170.2A CN112378980B (en) 2020-11-12 2020-11-12 Correction system and method for silk screen probe concentration detection device

Publications (2)

Publication Number Publication Date
CN112378980A true CN112378980A (en) 2021-02-19
CN112378980B CN112378980B (en) 2021-09-21

Family

ID=74583518

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011264170.2A Active CN112378980B (en) 2020-11-12 2020-11-12 Correction system and method for silk screen probe concentration detection device

Country Status (1)

Country Link
CN (1) CN112378980B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113466312A (en) * 2021-06-16 2021-10-01 上海交通大学 Electrolyte solution concentration measuring system and method based on microwave silk screen sensor
CN114939570A (en) * 2021-12-23 2022-08-26 浙江颀正环保科技有限公司 Method and device for controlling active carbon pickling based on solution pH value and conductivity

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107102031A (en) * 2017-04-18 2017-08-29 天津大学 Super-resolution imaging method for silk screen sensor
CN111610229A (en) * 2020-05-25 2020-09-01 重庆大学 Gas-liquid two-phase flow monitoring device, system and method
CN211577013U (en) * 2019-11-20 2020-09-25 天津工业大学 Oil-water two-phase flow water content measuring system based on microwave silk screen sensor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107102031A (en) * 2017-04-18 2017-08-29 天津大学 Super-resolution imaging method for silk screen sensor
CN211577013U (en) * 2019-11-20 2020-09-25 天津工业大学 Oil-water two-phase flow water content measuring system based on microwave silk screen sensor
CN111610229A (en) * 2020-05-25 2020-09-01 重庆大学 Gas-liquid two-phase flow monitoring device, system and method

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CASEY TOMPKINS ET AL: "Wire-mesh sensors: A review of methods and uncertainty in multiphase flows relative to other measurement techniques", 《NUCLEAR ENGINEERING AND DESIGN》 *
赵胤淇: "丝网探测器的研发与应用", 《中国优秀硕士学位论文全文数据库》 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113466312A (en) * 2021-06-16 2021-10-01 上海交通大学 Electrolyte solution concentration measuring system and method based on microwave silk screen sensor
CN114939570A (en) * 2021-12-23 2022-08-26 浙江颀正环保科技有限公司 Method and device for controlling active carbon pickling based on solution pH value and conductivity
CN114939570B (en) * 2021-12-23 2024-05-24 浙江颀正环保科技有限公司 Method and device for controlling acid washing of activated carbon based on pH value and conductivity of solution

Also Published As

Publication number Publication date
CN112378980B (en) 2021-09-21

Similar Documents

Publication Publication Date Title
CN112378980B (en) Correction system and method for silk screen probe concentration detection device
US4751466A (en) Instrument for on-line measurement of the absolute electrical conductivity of a liquid
CN103344840B (en) Method and device for conducting absolute measurement on electrical conductivity of solution and high-temperature melt
CN111123187B (en) Magneto-resistive chip calibration test system and method based on double ridge waveguides
CN105372288B (en) A kind of rate of heat flow measuring instrument and measuring method
CN111595910A (en) Concentration calculation method
Wang et al. An ultralow-noise Ag/AgCl electric field sensor with good stability for marine EM applications
CN109884134A (en) A kind of electric pole type crude oil water content real-time detector
CN215339820U (en) Dissolved oxygen meter calibration test system
CN102809445B (en) Thermocouple detection method
CN108827422A (en) Liquid level of liquid metal continuous measuring device and its level measuring method
CN112098457B (en) Polynomial regression calibration method of thermal conductivity measuring instrument
CN104849594B (en) Ionic liquid Electric transport properties high precision measuring device and the method with its measurement magneto-resistance effect
CN106596882A (en) PH meter for water quality detection
CN209416889U (en) A kind of circulation solution electrolytic cell device cooperating wire beam electrode
CN2591577Y (en) Automatic correcting temperature and salinity sensor
CN219015484U (en) Waterproof temperature inspection instrument
CN220752013U (en) Three-composite ion electrode with temperature compensation structure
CN206410885U (en) Multi-functional earth's surface water sampler
CN101140251A (en) Device for testing conductive polymer compound material temperature-resistance characteristic
CN214953465U (en) Real-time calibration system of dissolved oxygen sensor
CN109406584A (en) A kind of two-channel digital TDS sensor and its implementation
CN115825161A (en) Testing device for film resistor type gas sensor for vehicle
CN216717530U (en) Liquid level measuring device
Schiraldi et al. Determination of phase transitions through AC conductance

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant