CN110398523A - Milk discrimination method based on electrology characteristic - Google Patents
Milk discrimination method based on electrology characteristic Download PDFInfo
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- CN110398523A CN110398523A CN201910443133.9A CN201910443133A CN110398523A CN 110398523 A CN110398523 A CN 110398523A CN 201910443133 A CN201910443133 A CN 201910443133A CN 110398523 A CN110398523 A CN 110398523A
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- 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
- G01N27/02—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
- G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
Abstract
The present invention relates to a kind of milk discrimination method based on electrology characteristic, including the following steps: make the milk sample of unknown property；Computer, vector network analyzer, coaxial probe are correctly connected, the position of coaxial transmission cable is adjusted, by carrying out necessary calibration to vector network analyzer；Milk sample is repeatedly tested after determining test frequency range and using result averaged as final measurement result, there are multinomial test data and test index in test result, chooses the logarithm figure line related to dielectric loss factor logarithm of dielectric loss factor frequency；Carry out a fitting of a polynomial；Acquire parameter | a |, if | a | it is greater than 0.8, then it is assumed that milk sample detected is true milk.
Description
Technical field
The invention belongs to object electrology characteristic detection fields, are related to a kind of method that identification milk is true and false.
Background technique
Recently as continuous improvement of people's living standards, broad masses of the people increasingly pay close attention to food-safety problem.
Wherein, milk is often known as one of the mostly important component part in food " closest to perfect food ".
Because milk contains growth in humans's development, 24 kinds of amino acid and more than 20 kinds of fatty acid necessary to normal health are kept,
And various carbohydrates, vitamins, microelement etc..Suggest suck the breast in the Chinese residents dietary guidelines of publication in 2016 more
Class, adult edible must be equivalent to the various dairy products of 300g liquid milk daily.And for teenager, milk is benefit of replenishing the calcium
The nutriment of brain, the normal drink milk of teenager can grow tall, while be relatively beneficial to physical and mental health.
But milk instantly so it is salable in the market, be added to there are many businessman and manufacturer in order to obtain the profit of great number
In the ranks of milk production.It therefore is not real ox there are many milk of huge number in the current market that the good and bad jumbled together
Milk, it is essentially all mixed using additive and sugar for much bragging about the drink such as milk for children, milk beverage, modulation cream of " milk " etc.
Made of conjunction, teenager drinks easy long decayed tooth for a long time, and is easy to become fat.In addition, there are also some individual workship's creams and additions
By blending the milk for producing imitation, current this milk of blending is still relatively common in certain areas, serious to affect extensively for agent
The especially vast teen-age health of big resident.
And rest on the sense organ stage of people mostly currently for the true and false detection of milk, if wanting to carry out deep detection needs
Corresponding chemical reagent is added to milk sampling, is detected by chemical reaction, such mode is not only cumbersome, takes a long time expense
With higher and detected milk can be polluted cause unnecessary waste, it is therefore desirable to a kind of side of the milk Jianzhen of rapid cleaning
Method.Open-ended coaxial probe is the section of a coaxial transmission line, when probe immerses in fluid sample or pops one's head in and solid-like
When product surface is in contact, the signal amplitude of analyzer is reflected to according to test block and phasometer calculates tested material electrology characteristic
With the relationship of frequency, as shown in Figure 1, this method it is simple, conveniently, lossless, accuracy is higher.
Summary of the invention
The present invention provides one kind can identify the true and false method of milk.The method is a kind of based on coaxial probe and network
The test method of analyzer includes the electricity such as the dielectric constants of plurality of liquid such as milk, water, modulation cream by testing plurality of liquid
Characteristic determines the f-ε " that each testing liquid electrology characteristic draws out electrology characteristic parameter with coaxial probe tranmitting frequencyrVariation
Curve.The curve graph is analyzed, and carries out the logf-log ε " that a fitting of a polynomial obtains every kind of testing liquid of characterizationr
Characteristic equation realizes milk Jianzhen by the parameter in this equation.Technical solution is as follows:
A kind of milk discrimination method based on electrology characteristic, including the following steps:
(1) milk sample for making unknown property, sample is placed under same temperature environment, is in same temperature shape
State；
(2) computer, vector network analyzer, coaxial probe are correctly connected, adjusts the position of coaxial transmission cable, led to
It crosses and necessary calibration is carried out to vector network analyzer；
(3) milk sample is repeatedly tested after determining test frequency range and using result averaged as final
Measurement result, have multinomial test data and test index in test result, choose dielectric loss factor ε "rAnd it draws out
logf–logε″rThat is the logarithm of frequency figure line related to dielectric loss factor logarithm；
(4) fitting of a polynomial is carried out:
logε″r=a*logf+b
(5) parameter is acquired | a |, if | a | it is greater than 0.8, then it is assumed that milk sample detected is true milk.
Detailed description of the invention
Fig. 1 coaxial probe test method
Fig. 2 f and ε "rRelationship figure line (low frequency part)
Fig. 3 logf and log ε "rRelationship figure line (low frequency part)
Fig. 4 system connection schematic diagram
Tetra- kinds of unknown sample f-ε " of Fig. 5rCurve graph
Tetra- kinds of unknown sample logf-log ε " of Fig. 6rCurve graph (full rate)
Tetra- kinds of unknown sample logf-log ε " of Fig. 7rCurve graph (low frequency part)
Specific embodiment
The present invention provides one kind can identify the true and false method of milk.The method is a kind of based on coaxial probe and network
The test method of analyzer includes the electricity such as the dielectric constants of plurality of liquid such as milk, water, modulation cream by testing plurality of liquid
Characteristic determines the f-ε " that each testing liquid electrology characteristic draws out electrology characteristic parameter with coaxial probe tranmitting frequencyrVariation
Curve.The curve graph is analyzed, and carries out the logf-log ε " that a fitting of a polynomial obtains every kind of testing liquid of characterizationr
Characteristic equation realizes milk Jianzhen by the parameter in this equation.Due to can not be obtained from regular channel blent through cream it is bad
Matter vacation milk, therefore choice of modulation cream and blending type milk-contained drink and pure cow's milk compare test the present invention will be described.It is real
Proved recipe method is as follows:
(1) choose two kinds of pure cow's milk A, B respectively, two kinds of modulation cream C, D, two kinds of blending type milk-contained drink E, F as sample,
And sample is placed under same temperature environment, guarantee that this six kinds of samples are in same temperature state；
(2) 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；
(3) determine each sample test for 2-4 time after test frequency range and using result averaged as
Final measurement result has multinomial test data and test index in test result, chooses dielectric loss factor ε "rAnd it draws out
f-ε″rThe related figure line and logf-log ε " of (frequency --- dielectric loss factor)r(the logarithm of frequency --- dielectric loss factor
Logarithm) related figure line；
(4) suitable Frequency point is excessively chosen after observing figure line due to figure line high frequency section in a jumble and utilizes low frequency figure line number
According to a fitting of a polynomial is carried out, the formula of polynomial fitting is as follows.
logε″r=a*logf+b
(5) two parameters a, b among the above are obtained by test data through fitting, and all samples described in (1) are passed through
The characteristic equation of each sample is obtained with measuring process (3) (4), the expression of the characteristic equation of per sample (p.s.) is as shown in table 1.It is several
The actual measured results of known sample are as shown in Fig. 2, Fig. 3 and table 2.Pass through the ginseng of test result visible pure cow's milk and non-pure cow's milk
Number a numerical value difference is obvious, and then determines milk Jianzhen's parameter | atrue|=0.8.
The dielectric loss factor and frequency relation of each sample of table 1
Each known sample real medium fissipation factor of table 2 and frequency relation
(6) several unknown testing liquids are chosen, above-mentioned (2) (3) (4) measuring process is repeated, finds out several testing liquids
Functional equation log ε "rX=aX*logf+bXAnd the parameter a in regression equationXIf | aX|>|atrue|=0.8 testing liquid
For pure cow's milk, that is, true milk, if | aX|<|atrue|=0.8 is false milk or all kinds of milk beverages.
By carrying out electrology characteristic parameter using vector network analyzer and coaxial probe to a variety of known testing liquids
Measurement, it has been found that through their f-ε "r(frequency-electrology characteristic parameter) relation curve and logf-log ε "r(frequency logarithm-electricity
Learn characterisitic parameter logarithm) the obtained characteristic equation of relation curve there is certain rule and mathematical relationship, using this rule and
Mathematical relationship realizes effective identification of the quick nondestructive of milk.
Technical solution of the present invention is specifically illustrated with the identification of several samples to be tested below:
(1) four kinds of unknown type testing liquids 1,2,3,4 are chosen and are properly saved according to related request, are tested
Before take four kinds of unknown each 2 parts of samples of testing liquid 25ml to control under its room temperature environment for being in about 20 DEG C together, and with precision height survey
The electronic thermometer of quantitative response agility carries out temperature measurement, eliminates temperature and generates error；
(2) test macro is collectively constituted by vector network analyzer, coaxial probe, test software, system connection schematic diagram
Such as Fig. 3 institute.Booting preheating one hour afterwards is calibrated with open circuit (open), short-circuit (short) and three kinds of modes of matching impedance (load)
The port of Network Analyzer used in experiment, and whether succeeded using the verifying calibration of 20 DEG C of deionized water.Before test in advance
Measurement frequency range is set as 200~2000MHZ, line sampling point is 199；
(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 is as shown in figure 3, allow probe testing liquid to come into full contact with, while will visit using foam glass stick agitation liquid
The bubble that head nearby generates is driven away, and the error that bubble generates is eliminated.After the completion of above-mentioned steps, the environment temperature during experiment is kept
Control acquires data at 20 DEG C, by Network Analyzer, and the relationship of electrical parameter and frequency is calculated by test software, selects medium
Fissipation factor ε "rReflect the dielectric property of substance；
(4) every part of unknown fluid sample is repeated 2 times test, and every kind of unknown liquid to be measured carries out 4 measurements altogether, as a result flat
Test result of the mean value as this testing liquid avoids probe wiped clean from introducing correlated error after measurement every time；
(5) according to step (4) most test result draws out the f-ε " of four kinds of unknown liquid in length and breadthrCurve and logf-log
ε″rCurve is as shown in Fig. 5, Fig. 6, Fig. 7, by logf-log ε "rCurve carries out a fitting of a polynomial and finds out each unknown liquid
Parameter in characteristic equation and characteristic equation | aX| as shown in table 3.Compare | aX| with | atrue| size judge four kinds of unknown samples
Whether be true milk, while identification result being carried out with the truth of four kinds of unknown samples corresponding, it was demonstrated that this discrimination method
Accuracy and validity.
3 unknown sample test result of table
Claims (1)
1. a kind of milk discrimination method based on electrology characteristic, including the following steps:
(1) milk sample for making unknown property, each milk sample is placed under same temperature environment, is in same temperature shape
State.
(2) computer, vector network analyzer, coaxial probe are correctly connected, the position of coaxial transmission cable is adjusted, by right
Vector network analyzer carries out necessary calibration；
(3) milk sample is repeatedly tested after determining test frequency range and using result averaged as final survey
Amount chooses dielectric loss factor ε " as a result, have multinomial test data and test index in test resultrAnd draw out logf-log
ε″rThat is the logarithm of frequency figure line related to dielectric loss factor logarithm,
(4) fitting of a polynomial is carried out:
logε″r=a*logf+b
(5) parameter is acquired | a |, if | a | it is greater than 0.8, then it is assumed that milk sample detected is true milk.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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2019
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| CN103558259A (en) * | 2013-11-20 | 2014-02-05 | 西北农林科技大学 | Whey protein content predication models based on cow milk dielectric property and establishment method thereof |
| CN106248746A (en) * | 2016-09-25 | 2016-12-21 | 西北农林科技大学 | A kind of milk protein method for quickly detecting contents based on dielectric and magnetic technology |
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Application publication date: 20191101 |