CN110186963A - A method of NaCl concentration of aqueous solution is judged based on dielectric property measurement - Google Patents
A method of NaCl concentration of aqueous solution is judged based on dielectric property measurement Download PDFInfo
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- CN110186963A CN110186963A CN201910443136.2A CN201910443136A CN110186963A CN 110186963 A CN110186963 A CN 110186963A CN 201910443136 A CN201910443136 A CN 201910443136A CN 110186963 A CN110186963 A CN 110186963A
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- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
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Abstract
The present invention relates to a kind of methods for judging NaCl concentration of aqueous solution based on dielectric property measurement, including the following steps: prepares the NaCl aqueous solution of various concentration；It using each NaCl aqueous solution of the known concentration of configuration as sample, is placed under same environment temperature, guarantees that sample is in same temperature state with the mode of heating water bath；Computer, vector network analyzer, coaxial probe are correctly connected, the position of coaxial transmission cable is adjusted, necessary calibration is carried out to vector network analyzer；Determine that test frequency is 6GHz, repeatedly tested each sample, and using result averaged as final measurement result have multinomial test data in test result, selection dielectric constant obtains the dielectric constant values under various concentration as test index；The data of test are fitted analysis, obtain matched curve.
Description
Technical field
The invention belongs to the technical fields of dielectric property detection, are related to a kind of method for judging NaCl concentration of aqueous solution.
Background technique
NaCl aqueous solution has a wide range of applications in fields such as food, medicine, well loggings, therefore the research of NaCl aqueous solution is
The concern by many scholars at home and abroad is known, by various theoretical and detection method research NaCl aqueous solution architectures and dense
Spend measurement problem.In industrial aspect, electrolysis NaCl aqueous solution, hydrogen and chlorine can be generated, chlorine has very extensively in chemical industry
Application, can be used for synthesizing polyvinyl chloride, insecticide, hydrochloric acid etc.；In terms of medicine, concentration is that 0.9%NaCl aqueous solution claims
For physiological saline, physiological saline is main humor substitute, is widely used in treatment and prevention dehydration, is also used for intravenous injection and controls
Treat and prevent hypovolemic shock.In terms of food, salt is not only indispensable flavouring, Er Qieshi in people's diet
Indispensable material composition in human body, its main component are NaCl, and the saline taste of salt can stimulate the sense of taste of people, increase oral cavity
Salivary secretion, to improve a poor appetite and improve food digestion rate, but excessive edible salt can make the mankind suffer from a variety of diseases.?
Agriculture aspect, the NaCl solution of various concentration have different influences, various concentration to the growth and development at soya seeds rudiment initial stage
NaCl processing will affect the formation of grape fruit quality.
Dielectric property is a kind of intrinsic physical attribute of dielectric, can indicate the ability of dielectric storage electric field energy, instead
Reflect the ability that the dielectric improves condenser capacity.What is mainly used to dielectric property detection method at this stage is based on network
The dielectric and magnetic technology of analyzer, its advantages are that measurement is rapid, quick.But for the accuracy for guaranteeing measurement, to measured
Object require be surfacing solid either uniform liquid.Open-ended coaxial probe is a coaxial transmission line
Section is reflected to analyzer according to test block when probe immerses in fluid sample or probe is in contact with solid sample surface
Signal amplitude and phasometer calculate the dielectric property of tested material, this method is simple, conveniently, lossless, accuracy is higher.
Summary of the invention
The present invention provides a kind of methods for detecting NaCl concentration of aqueous solution.The method is a kind of based on dielectric property measurement
Method determine that each testing liquid dielectric is special by testing the dielectric properties such as dielectric constant of various concentration NaCl aqueous solution
Property draws out NaCl concentration of aqueous solution with the ε-c change curve of dielectric constant.The curve is analyzed, and is carried out curve fitting
It obtains characteristic equation, the concentration of NaCl aqueous solution is acquired by this equation.Technical scheme is as follows:
A method of NaCl concentration of aqueous solution is judged based on dielectric property measurement, including the following steps:
(1) prepare various concentration NaCl aqueous solution, solution concentration value from 0% to 1%, interval 0.1%, from 1% to
10%, interval 1%, from 10% to 20% is spaced 2%, the NaCl aqueous solution of totally 25 kinds of concentration；
(2) it using each NaCl aqueous solution of the known concentration of preparation as sample, is placed under same environment temperature, uses water
The mode of bath heating guarantees that sample is in same temperature state；
(3) computer, vector network analyzer, coaxial probe are correctly connected, adjusts the position of coaxial transmission cable, it is right
Vector network analyzer carries out necessary calibration；
(4) determine test frequency be 6GHz, each sample is repeatedly tested, and using result averaged as
Final measurement result has multinomial test data in test result, chooses dielectric constant as test index, obtains various concentration
Under dielectric constant values；
(5) data of test are fitted analysis, obtain matched curve:
The related coefficient of fit equation is 0.99994, and it is good to show that the concentration of NaCl aqueous solution and dielectric constant have
Correlation；
(6) unknown concentration NaCl aqueous solution to be measured is chosen, above-mentioned (4) measuring process is repeated, obtains corresponding dielectric constant,
It substitutes into formula (1), calculates solution concentration c.
Detailed description of the invention
The relation curve of Fig. 1 NaCl concentration of aqueous solution and dielectric constant
System connection schematic diagram (1- computer Fig. 2 of the invention；2- Network Analyzer；3- metal probe bracket；4- is coaxial
Cable；5- electronic thermometer；6- coaxial probe；7- sample)
Specific embodiment
The present invention is based on dielectric property measurements to realize lossless quick detection to fluid to be measured, studied after can detect it is different to
Different dielectric characteristic of the liquid under same frequency is surveyed, corresponding characteristic equation and related law are obtained, is provided using this rule
A kind of judgement NaCl concentration of aqueous solution method.
By carrying out dielectric property using vector network analyzer and coaxial probe to a variety of known concentration NaCl aqueous solutions
The measurement of parameter, it has been found that there are this for the characteristic equation obtained through their ε-c (dielectric constant-concentration) relation curve
Fixed rule and mathematical relationship, with this rule and quick judgement of the mathematics relational implementation to NaCl concentration of aqueous solution.Of the invention
Technical solution is as follows:
(1) NaCl aqueous solution is prepared, for solution concentration value from 0% (pure distilled water) to 1%, interval 0.1% is (pure from 1%
Distilled water) to 10%, interval 1% is spaced 2%, the solution of totally 25 kinds of concentration from 10% (pure distilled water) to 20%.NaCl water
Solution is prepared according to following:
C=[mAgent/(mAgent+mWater)] × 100%
In formula: mAgent--- the quality of NaCl reagent, mWater--- the quality of distilled water.
(2) using the NaCl aqueous solution of 25 kinds of concentration of preparation as sample, be placed under same environment temperature, with water-bath plus
The mode of heat guarantees that sample is in same temperature state；
(3) computer, vector network analyzer, coaxial probe are correctly connected, adjusts the position of coaxial transmission cable, led to
The related software crossed in computer and relevant operation carry out necessary calibration to vector network analyzer；
(4) it determines that test frequency is 6GHz, 2-4 test is carried out to each sample, and result averaged is made
For final measurement result, there is multinomial test data in test result, chooses dielectric constant and be used as test index, it is dense to obtain difference
Dielectric constant values under degree；
(5) data of test are fitted analysis, obtain matched curve (such as Fig. 1) and fitting formula (1)
The related coefficient of fit equation is 0.99994, and it is good to show that the concentration of NaCl aqueous solution and dielectric constant have
Correlation；
(6) concentration from 2% to 20% that measurement is obtained, interval 2%, the dielectric constant of 10 kinds of NaCl aqueous solutions is brought into
In formula (1), relative error is calculated, as shown in table 1；
1 calculated value of table is compared with measured value
(7) as shown in Table 1, the NaCl concentration of aqueous solution and experiment NaCl aqueous solution being calculated using formula (1) are true
It coincide very much on concentration values, and γmaxIt is relatively more accurate to illustrate formula (1) by < 0.3%, therefore this formula can be used to calculate NaCl water
Solution concentration；
(8) several unknown concentration NaCl aqueous solutions to be measured are chosen, above-mentioned (4) measuring process is repeated, obtains corresponding dielectric
Constant substitutes into formula (1), calculates solution concentration c, calculates relative error γ with formula (2), to be measured molten if γ < 0.3%
Liquid concentration value is identical as calculated value, if γ >=0.3%, solution concentration value to be measured is different from calculated value.
Technical solution of the present invention is specifically illustrated with the concentration judgement of several samples to be tested below:
(1) prepare 4 kinds of unknown concentrations NaCl aqueous solution 1,2,3,4 to be measured, be placed under same environment temperature, with water-bath plus
The mode of heat guarantees that sample is in same temperature state, carries out temperature prison with the quick electronic thermometer of precision high measurement reaction
Control；
(2) test macro is collectively constituted by vector network analyzer, coaxial probe, test software, system connection schematic diagram
As shown in Figure 2.Booting preheating one hour is needed before test, presetting measurement frequency is 6GHz, with open circuit (open), short circuit
(short) and the port of Network Analyzer used in three kinds of mode calibration experiments of matching impedance (load), and deionization is utilized
Whether water verifying calibration succeeds；
(3) when testing, the beaker for holding testing liquid is gently placed under probe, guarantees that coaxial probe is in prepare liquid
2-4cm under body fluid face allows probe testing liquid to come into full contact with, while will be popped one's head in using foam glass stick agitation liquid and nearby be generated
Bubble drive away, eliminate bubble generate error.After the completion of above-mentioned steps, data are acquired by Network Analyzer；
(4) every part of sample is repeated 3 times test, test result of the average value as this sample to be tested as a result, measures every time
It avoids probe wiped clean from introducing correlated error afterwards；
(5) dielectric constant of 4 parts of samples is obtained according to the test of step (4), and calculates solution concentration with formula (1), used
Formula (2) calculates relative error, and the results are shown in Table 2, calculated result is compared with actual concentrations, it was demonstrated that this judgment method
Accuracy and validity.
2 unknown concentration sample testing result of table
Claims (1)
1. a kind of method for judging NaCl concentration of aqueous solution based on dielectric property measurement, including the following steps:
(1) the NaCl aqueous solution of various concentration is prepared, solution concentration value from 0% to 1% is spaced 0.1%, from 1% to 10%,
Interval 1%, from 10% to 20% is spaced 2%, the NaCl aqueous solution of totally 25 kinds of concentration；
(2) using each NaCl aqueous solution of the known concentration of preparation as sample, be placed under same environment temperature, with water-bath plus
The mode of heat guarantees that sample is in same temperature state；
(3) computer, vector network analyzer, coaxial probe are correctly connected, the position of coaxial transmission cable is adjusted, to vector
Network Analyzer carries out necessary calibration.
(4) it determines that test frequency is 6GHz, each sample is repeatedly tested, and using result averaged as final
Measurement result, have multinomial test data in test result, choose dielectric constant as test index, obtain under various concentration
Dielectric constant values；
(5) data of test are fitted analysis, obtain matched curve:
The related coefficient of fit equation is 0.99994, and it is related well to show that the concentration of NaCl aqueous solution has to dielectric constant
Property；
(6) unknown concentration NaCl aqueous solution to be measured is chosen, above-mentioned (4) measuring process is repeated, obtains corresponding dielectric constant, is substituted into
In formula (1), solution concentration c is calculated.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110687135A (en) * | 2019-09-29 | 2020-01-14 | 天津大学 | Water hardness measuring method of microwave coaxial probe sensor |
| CN110687295A (en) * | 2019-09-01 | 2020-01-14 | 天津大学 | Method for measuring dielectric property of glucose solution |
| CN110849945A (en) * | 2019-12-04 | 2020-02-28 | 大连理工大学 | Method for rapidly and nondestructively detecting milk properties and milk adulterants |
| CN112230061A (en) * | 2020-07-16 | 2021-01-15 | 深圳市计量质量检测研究院 | SAR tissue fluid modulation system and modulation method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110687295A (en) * | 2019-09-01 | 2020-01-14 | 天津大学 | Method for measuring dielectric property of glucose solution |
| CN110687135A (en) * | 2019-09-29 | 2020-01-14 | 天津大学 | Water hardness measuring method of microwave coaxial probe sensor |
| CN110849945A (en) * | 2019-12-04 | 2020-02-28 | 大连理工大学 | Method for rapidly and nondestructively detecting milk properties and milk adulterants |
| CN112230061A (en) * | 2020-07-16 | 2021-01-15 | 深圳市计量质量检测研究院 | SAR tissue fluid modulation system and modulation method |
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Application publication date: 20190830 |