CN100573133C - Improve the method and the detecting instrument of milk quality ultrasonic detection precision - Google Patents

Improve the method and the detecting instrument of milk quality ultrasonic detection precision Download PDF

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CN100573133C
CN100573133C CNB2007100572655A CN200710057265A CN100573133C CN 100573133 C CN100573133 C CN 100573133C CN B2007100572655 A CNB2007100572655 A CN B2007100572655A CN 200710057265 A CN200710057265 A CN 200710057265A CN 100573133 C CN100573133 C CN 100573133C
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milk
ultrasonic
temperature
control module
amp
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CNB2007100572655A
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CN101071123A (en
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徐可欣
孙选
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天津大学
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Abstract

The invention belongs to the milk quality testing technical field, particularly improve the method and the detecting instrument of milk quality ultrasonic detection precision.For milk quality supersonic detection method and the detecting instrument that reduces temperature effect in a kind of milk quality Ultrasonic Detection and improve the model prediction precision is provided, the technical solution used in the present invention is: measurement is to carry out in to milk heating process to the milk ultrasonic parameter, the milk ultrasonic parameter is to set up with the ultrasonic parameter at a plurality of temperature spots of milk place with related calibration model between milk principal ingredient concentration, each constituent concentration of unknown concentration milk be use with the modeling uniform temp under the ultrasonic parameter substitution calibration model that measures calculate.The present invention is mainly used in milk quality testing.

Description

Improve the method and the detecting instrument of milk quality ultrasonic detection precision

Technical field

The invention belongs to the milk quality testing technical field, particularly reduce temperature effect in the milk quality Ultrasonic Detection and improve the model prediction precision the raising milk quality ultrasonic detection precision method and based on the milk quality Ultrasonic Detection instrument of the method.

Technical background

Milk and dairy produce are nutraceutical essential in our daily life, and its quality good or not is directly connected to consumer's health.Be to guarantee the quality of milk and dairy produce, from the science of milk cow raise, purchase, milk and the quality control of dairy produce process of raw material milk be to the whole process of the acceptance test of finished product milk, all need milk quality is tested.To the core content of milk quality testing is measurement to milk principal ingredient content.Traditional milk quality testing mostly adopts chemical analysis method, adopts crust cloth cock method usually as the fats measurement in the milk, and Kjeldahl is adopted in the measurement of protein content, and iodimetric titration is adopted in the measurement of lactose content.Chemical analysis method complicated operation, technical requirement height, need chemical reagent, test duration long, and measuring accuracy is subjected to human factor and such environmental effects big, more and more can not satisfies the needs of the needs, particularly online detection of actual detected.In the last few years, the infrared spectrum detection method that is comparatively fast developed in the milk composition analysis field because of sample need not pre-service, and was not destroyed, and consumption is few; Need not chemical reagent, do not pollute; Advantages such as analysis speed is fast obtain the approval of authoritative institution.But owing to cost an arm and a leg, disposable having high input restricts its widespread use.It is the new method that is worthy to be popularized at present that using ultrasonic technology detects milk quality.This method except that advantage with infrared spectrum detection method, also have cost low, simultaneously the multiple composition of nondestructive measurement, can test advantage such as opaque liquid, be a kind of real green test technology.But existing what take based on the milk quality testing instrument of ultrasound wave principle is that milk is heated to uniform temperature, and keeps constant temperature, measures ultrasonic parameter under temperature constant state.Because of temperature-controlled precision is difficult to reach very high precision, so the measurement of ultrasonic parameter is subjected to Temperature Influence very big.What existing in addition ultrasonic milk quality testing instrument adopted is the model of setting up with the ultrasonic parameter under the temperature, the ultrasonic parameter number is less than tested milk constituents number, the measurement of multicomponent content is by experimental formula, thereby can't satisfy the requirement of engineering survey to the accuracy of detection of milk quality.

Summary of the invention

For overcoming the deficiencies in the prior art, the objective of the invention is to: the milk quality supersonic detection method and the detecting instrument that reduce temperature effect in a kind of milk quality Ultrasonic Detection and improve the model prediction precision are provided.

In order to achieve the above object, the technical solution used in the present invention is:

A kind of method that improves milk quality ultrasonic detection precision, measurement is carried out in to milk heating process to the milk ultrasonic parameter, the milk ultrasonic parameter is to set up with the ultrasonic parameter at a plurality of temperature spots of milk place with related calibration model between milk principal ingredient concentration, each constituent concentration of unknown concentration milk be use with the modeling uniform temp under the ultrasonic parameter substitution calibration model that measures calculate.

The ultrasonic parameter of measuring is velocity of ultrasonic sound and ultrasonic attenuation coefficient.

Heating process is that milk temperature heats from low to high from 20 ℃ to 40 ℃, and carries out the measurement of ultrasonic parameter in heating process.

When measuring ultrasonic parameter, measure the temperature of milk.

The ultrasonic parameter that is used for modeling is the ultrasonic parameter of two or more temperature spots of milk from 20 ℃ to 40 ℃.

Related calibration model be from 20 ℃ to 40 ℃ the multiple linear regression model of offset minimum binary 2 type PLS2 algorithms foundation of the velocity of sound of two or more temperature spots of milk and attenuation coefficient.

A kind of testing tool that improves milk quality ultrasonic detection precision comprises: main control module, ultrasound emission circuit module, ultrasonic receiving circuit module, ultrasonic reception and transmitting probe, sample cell, temperature test circuit module, milk heating-up temperature adjustment module, the auto injection/cleaning module be made up of multi-functional microprocessor; Main control module links to each other with ultrasound emission circuit module, ultrasonic receiving circuit module, temperature test circuit module, milk heating-up temperature adjustment module, auto injection/cleaning module respectively; The ultrasound emission circuit module connects ultrasound emission probe, the ultrasonic receiving transducer of ultrasonic receiving circuit module; The sample introduction signal that main control module produces sends to auto injection/cleaning module, the heating signal that main control module produces sends to milk heating-up temperature adjustment module, the detected temperature signal of temperature test circuit module sends to main control module, the control signal that main control module produces sends to the ultrasound emission circuit module, the signal that ultrasonic receiving circuit module receives is sent to main control module, the heating signal that stops that main control module produces when measuring end is sent to milk heating-up temperature adjustment module, the velocity of sound that main control module calculates, attenuation coefficient is sent to memory storage, and main control module passes through output display device, printing equipment and be used to connect computer by serial and export.

The velocity of sound that described main control module calculates, attenuation coefficient, being the velocity of sound, the attenuation coefficient that described main control module calculates, is that described main control module default temperature spot heating control module arrives 20 ℃ to 40 ℃ from 20 ℃ to 40 ℃ the heating process carries out; Described main control module calculates test result according to the forecast model of following fatty consistency and protein concentration:

S F = k F + Σ i = 1 n k Fi c i + Σ i = 1 n k αi α i S P = k P + Σ i = 1 n k Pi c i + Σ i = 1 n k qi α i

S in the formula F, S PMass percent concentration for fat and protein in the milk; c iFor milk at 20 ℃ of velocities of sound during i temperature between 40 ℃, the m/s of unit; α iFor milk at 20 ℃ of ultrasonic attenuation coefficients during i temperature between 40 ℃, the dB/cm of unit; k F, k Fi, k α i, k P, k Pi, k QiBe regression coefficient, n counts for the temperature of measuring ultrasonic parameter.

The present invention possesses following technique effect:

The present invention proposes to adopt the ultrasonic parameter at a plurality of temperature spots place to participate in modeling, increased the specificity that participates in the modeling ultrasonic parameter on the one hand, be used in the ultrasonic parameter of modeling and comprise more milk quality information, be equivalent to increase indirectly the independent variable number on the other hand, thereby make the independent variable number more than tested milk constituents number, realized redundant computation.Improved the precision of prediction of model.

Because in the present invention, each constituent concentration of the milk of unknown concentration is to calculate by the ultrasonic parameter substitution calibration model of measurement with modeling uniform temp point place, adopted the measuring method of in heating process, measuring ultrasonic parameter, many temperature spots ultrasonic parameter participates in the multivariate regression modeling method of modeling, and the method for having measured the milk ultrasonic parameter substitution Model Calculation at a plurality of temperature spots place during milk quality testing, so the present invention has reduced the influence of temperature to ultrasonic parameter, improved the model prediction precision, finally improve the milk quality testing precision, reached the requirement of engineering survey.

Description of drawings

Fig. 1 temperature influences experimental result to milk acoustic velocity measutement repeatability.

Fig. 2 temperature influences experimental result to milk ultrasonic attenuation coefficient measuring repeatability.

Fig. 3 protein content is 2.33% o'clock, and the milk velocity of sound of different fatty consistencies varies with temperature relation.

Fig. 4 fatty consistency is 1.5%, the milk velocity of sound and temperature relation that protein concentration is different.

Fig. 5 protein concentration is 2.33% o'clock, the ultrasonic attenuation coefficient of the milk of different fatty consistencies and the relation of temperature.

Fig. 6 fatty consistency is 1.5% o'clock, the ultrasonic attenuation coefficient of the milk of different proteins concentration and the relation of temperature.

The ultrasonic milk quality testing instrument of Fig. 7 constitutes synoptic diagram.

The ultrasonic milk quality testing instrument software of Fig. 8 control flow chart.

Embodiment

Principal feature on the technology of the present invention is:

1, to the milk ultrasonic parameter---the measurement of the velocity of sound and attenuation coefficient is measured from initial temperature to 40 ℃ heating process milk, when the milk ultrasonic parameter is measured, detect the temperature of milk earlier, when detecting temperature and reach design temperature, carry out the measurement of milk ultrasonic parameter immediately, so just the temperature control with prior art changes thermometric into.The temperature control precision of existing technology is ± 1 ℃, and temperature-controlled precision is lower.And the thermometric mode that the present invention adopts can reach ± 0.01 ℃ precision.Reduced the influence that temperature is measured the milk ultrasonic parameter so effectively.

2, the milk ultrasonic parameter is to set up with the ultrasonic parameter at a plurality of temperature spots of milk place with related calibration model between milk principal ingredient concentration, and has used offset minimum binary 2 types (PLS2) the multiple regression algorithm in the chemometrics method in modeling process.Related calibration model is between butterfat, protein concentration and velocity of ultrasonic sound, attenuation coefficient:

S F = k F + Σ i = 1 n k Fi c i + Σ i = 1 n k αi α i

S P = k P + Σ i = 1 n k Pi c i + Σ i = 1 n k qi α i

S in the formula F, S PMass percent concentration for fat and protein in the milk; c iFor milk at 20 ℃ of velocities of sound during i temperature between 40 ℃, the m/s of unit; α iFor milk at 20 ℃ of ultrasonic attenuation coefficients during i temperature between 40 ℃, the dB/cm of unit; k F, k Fi, k α i, k P, k Pi, k QiBe regression coefficient, n counts for the temperature of measuring ultrasonic parameter.

Be elaborated below in conjunction with embodiment and description of drawings technical scheme to this invention.

Temperature is one of principal element that influences the milk quality Ultrasonic Detection.In order to seek to reduce the influence of temperature, must analyse in depth influence degree, the rule of milk Ultrasonic Detection temperature to the milk quality ultrasonic measurement.The present invention has studied Temperature Influence from two angles by experiment.Studied the influence of temperature on the one hand, studied the influence degree that temperature is measured the milk ultrasonic parameter on the other hand milk ultrasonic parameter measuring repeatability.

1. temperature is to the influence of milk ultrasonic parameter measuring repeatability

Get commercially available Bright brand pasteurization plain chocolate 500ml, be divided into 10 parts, every part of 50ml.Sample cell is inserted water bath with thermostatic control, temperature control precision ± 0.1 ℃.From 20 ℃ to 40 ℃, the gradient of temperature is 2 ℃, and each portion milk sample is used ultrasonic parameter tester duplicate measurements 15 times at each temperature spot place, writes down the each velocity of sound and attenuation coefficient.Calculate the velocity of sound at each temperature spot place and the standard deviation of attenuation coefficient duplicate measurements then, and draw out the situation in the whole temperature range.Experimental calculation result as depicted in figs. 1 and 2.

Find out that from Fig. 1 and Fig. 2 along with the rising of temperature, the measuring repeatability of the velocity of sound and attenuation coefficient improves gradually, promptly the measurement standard deviation reduces gradually; All tend towards stability since 34 ℃ of standard deviation values variations.The dispersion of explanation measured value of the velocity of sound and attenuation coefficient when low temperature is bigger, and repeatability is relatively poor, and temperature is when high, and the dispersion of the measured value of the velocity of sound and attenuation coefficient is little, good reproducibility.So to the temperature high zone of the optimum temperature of the measurement of milk ultrasonic parameter at 34 ℃~40 ℃.In industrial milk quality testing, the initial temperature of milk sample is usually below 20 ℃.Like this, want to milk carry out accurately, stable detection, must be heated to 34 ℃~40 ℃ and carry out.

2. temperature is to the influence degree of milk ultrasonic parameter measurement

Fig. 3 has described when protein content one timing, and ultrasound wave is the temperature variant situation of the velocity of sound in the different milk of fat content.

Fig. 4 has described when fatty consistency one timing, and ultrasound wave is the temperature variant situation of the velocity of sound in the different milk of protein concentration.

Fig. 5 has described when protein concentration one timing, and ultrasound wave is the temperature variant situation of ultrasonic attenuation coefficient in the different milk of fatty consistency.

Fig. 6 has described when fatty consistency one timing, and ultrasound wave is the temperature variant situation of ultrasonic attenuation coefficient in the different milk of protein concentration.

The experimental result of analysis-by-synthesis Fig. 3~Fig. 6 draws: (fatty absolute error is less than 0.1% less than industrial substantial measurement errors to want that fat and protein quality percent concentration in the milk are detected absolute error, protein absolute error 0.15%) requirement must be higher than temperature control precision 0.1 ℃.

Comprehensive above-mentioned two experiment situations when the using ultrasound ripple detects milk quality, must be heated to more than 34 ℃ and temperature control precision is better than 0.1 ℃.And existing milk quality ultrasonic tesint instrument employing is heated to 40 ℃ of constant temperature measurements, and temperature control precision is ± 1 ℃, and such temperature control precision obviously can not satisfy the requirement of high-acruracy survey.And to bring up to 0.1 ℃ to temperature control precision, implement very difficult.So the present invention proposes to measure the method for milk velocity of ultrasonic sound and attenuation coefficient in to the process of milk heating, to reduce the influence of temperature to measuring.

The method of measuring milk velocity of ultrasonic sound and attenuation coefficient in the process of milk heating is that milk is heated to 40 ℃ from initial temperature, in heating process, measures the velocity of sound and the attenuation coefficient of milk, need not wait until constant temperature.Because it is 120s~180s that milk sample is heated to time of 40 ℃ from initial temperature, be several milliseconds and finish a ultrasonic measurement required time, about 0.001 ℃ of temperature variation in the ultrasonic measurement process like this, and 0.001 ℃ temperature variation causes that the variation of milk ultrasonic parameter is very little, so can think that in the ultrasonic measurement process be temperature constant state, temperature variation can be ignored to the influence of measuring moment.

Measurement milk velocity of ultrasonic sound and attenuation coefficient method have only heating process in the process of milk heating, there is not temperature control, do not need temperature is controlled at temperature constant state, avoided not influencing measuring accuracy, the deficiency of yet having avoided the testing efficiency that causes because of temperature control to descend because of accuracy of temperature control is high.In heating process, to detect temperature, the sensitivity of thermometry of the temperature test system of the present invention's design is 0.01 ℃, satisfies the requirement of milk measuring accuracy to temperature well.

Obtaining high milk ultrasonic parameter measurement stability and precision is the prerequisite of high Precision Detection milk quality, also is the key that obtains the high precision milk quality testing and set up sane concentration prediction model.Ultrasonic parameter when existing milk quality ultrasonic tesint instrument only adopts 40 ℃ carries out modeling, because independent variable (velocity of sound, the attenuation coefficient) number of modeling is less than tested milk principal ingredient (fat, protein, lactose etc.) number, thereby model separate not unique, the constituent concentration that has needs to calculate acquisition by experimental formula, and the milk detecting precision can not reach very high level like this.

The present invention proposes to adopt the ultrasonic parameter at a plurality of temperature spots place to participate in modeling, can increase the specificity that participates in the modeling ultrasonic parameter on the one hand, be used in the ultrasonic parameter of modeling and comprise more milk quality information, be equivalent to increase indirectly the independent variable number on the other hand, thereby make the independent variable number more than tested milk constituents number, realize redundant computation.

In order to obtain to participate in the optimum temperature point and the number of modeling, the present invention studies 2 temperature, 3 temperature, 4 temperature and 5 these four kinds of situations of temperature respectively.Experimental result is as shown in table 1.

Table 1 is for setting up the PLS2 calibration model with the milk velocity of sound of different temperature points and number and attenuation coefficient and butterfat, protein concentration, and the result who verifies with the individual authentication collection sample of relevant temperature.

Table 1 different temperature points and number calibration model predict the outcome

R is the prediction related coefficient of model in the table, and RMSEP is a predicted root mean square error.

The prediction effect of the calibration model that the reduced temperature various combination is set up is as can be seen: what precision of prediction was the highest is the combination of 35 ℃+40 ℃ of two temperature.Along with the increase of combination temp number, precision of prediction but descends.This explanation is when setting up the temperature correction model, and it is The more the better to be not that temperature is counted.The temperature spot that participates in modeling is many, though can comprise more milk constituents concentration information, also may introduce more interfere information.

Draw by comparative analysis: the precision of prediction of 35 ℃+40 ℃ two temperatures local temperature calibration models of the employing velocity of sound and attenuation coefficient associating modeling is the highest, fatty consistency is in 1.5%~5.3% scope, predicted root mean square error (RMSEP) is 0.059%, and the model related coefficient reaches 0.996; Protein concentration is in 2.33%~4.36% scope, and predicted root mean square error (RMSEP) is 0.106%, and the model related coefficient reaches 0.991.Such precision can satisfy the requirement of commercial measurement precision (the fats measurement root-mean-square error is less than 0.1%, and protein is measured root-mean-square error less than 0.15%).

3. the milk quality testing instrument based on the method for the invention constitutes as shown in Figure 7, and this instrument is made of hardware and software two parts.The hardware components of instrument partly is made up of main control module (multi-functional microprocessor), ultrasound emission circuit module, ultrasonic receiving circuit module, ultrasonic reception and transmitting probe, sample cell, temperature test circuit module, milk heating-up temperature adjustment module, auto injection/cleaning module, LCD display module, print module, communication module and guidance panel etc.

1) convergent oscillation impulse ultrasound round-robin method is adopted in acoustic velocity measutement, promptly under the control of main control module, produce the driving voltage pulse of a certain width by the ultrasound emission circuit, this arteries and veins is popped one's head in from being applied to ultrasound emission, produce ultrasound wave, this ultrasound wave is through milk, ultrasonic receiving transducer, shaping circuit, the ultrasound emission circuit, stimulated emission is popped one's head in again, repeat same closed circuit, produce continuous ultrasonic receipts/send out, N used time T received/sent out to record, calculate average transmitting-receiving time t=T/N, utilize formula c=L/t to calculate the velocity of sound then.

The sound intensity decay measurement is by behind the driving voltage and receiving end signal voltage of measuring the ultrasound emission end, uses following formula and calculates.

α = 10 f ( MHz ) L ( cm ) log U in U out

In the formula: α---ultrasonic attenuation coefficient; F---supersonic oscillations frequency; U In---transmitting terminal driving voltage amplitude; U Out---the receiving end signal voltage magnitude; L---ultrasonic transmitting-receiving probe spacing.

2) the milk temperature adjustment module is to be used for milk slowly is heated to 40 ℃ from initial temperature, is generally 60s~180s heat time heating time, and it is different because of the height of milk initial temperature specifically to heat required time.

3) the temperature test module is the temperature that is used to detect milk, cooperate with heating module on the one hand, temperature rate-of-rise during with the heating of control milk cooperates with the ultrasonic parameter measurement module, on the other hand so that the measurement of milk ultrasonic parameter is carried out at a plurality of temperature spots place that sets.

When 4) auto injection/cleaning module is implemented in work milk is sucked sample cell, to be tested being over discharged sample cell with milk again.Also be used for cleansing solution suction/discharge sample cell, realize automatic cleaning sample cell.

5) LCD display is used for display analysis result, process variable, duty and warning message etc.

6) guidance panel is used for carrying out operations such as mode of operation is selected, parameter is provided with.

7) print module is used for the test result report printing is come out.

8) the serial communication module is used for test result is transferred to PC, so that test result collected, handles etc.

Based on the software design more complicated of the milk quality testing instrument of the method for the invention, multiple programming technique has been used in the centre, and comprises complicated demonstration and composition counting subroutine.Owing to have many numeral system conversions and transcendental function, for when guaranteeing computational accuracy, reduce the expense of storage unit as much as possible, when carrying out complicated calculating, adopt to table look-up to replace big data operation, to improve operation efficiency.

Instrument is under software control, workflow divides two stages to carry out: first stage is the instrument warm-up phase, start back instrument carries out the initialization setting, and guidance panel, LCD display, temperature sensor, heating arrangement, ultrasonic transceiver module, auto injection/cleaning module etc. are carried out the duty inspection, if each functional module is working properly, then enter the instrument preheat mode, otherwise give the information that is out of order.Be generally preheating time 3~5 minutes.Arrive when preheating time, instrument is in the ready state that detects.Instrument enters subordinate phase when the test button of guidance panel is pressed.Subordinate phase is the milk sample quality testing stage.This stage is under the control of main control module, according to " sample introduction---heating---temperature detection---emission receives ultrasound wave---calculate the velocity of sound, attenuation coefficient and record---temperature detection---emission receives ultrasound wave---calculating the velocity of sound, attenuation coefficient and record---...---stop heating---calculating each principal ingredient content of milk---show, printing test result " step carries out.In this process, run into unusually then interrupt test, get back to the detection original state, and show the fault information.The instrument software control flow as shown in Figure 8.

The present invention is characterized in:

1. the measurement of milk ultrasonic parameter is measured in to the Milk During Heating process.

2. the milk ultrasonic parameter is with the ultrasonic ginseng under a plurality of temperature of milk with related calibration model between Principal Milk Constituents concentration Amount and Principal Milk Constituents concentration are set up.

3. each constituent concentration of the milk of unknown concentration is to use with the ultrasonic parameter substitution calibration model of modeling uniform temp to count Obtain.

Those skilled in the art enlightens according to technology provided by the invention, can make the technical scheme of some accommodations, for example, Increase temperature survey between 20 ℃ to 40 ℃ and count, perhaps temperature range is expanded to 15 ℃ to 50 ℃, these change still in this theory Within the bright book covering scope.

Claims (5)

1, a kind of method that improves milk quality ultrasonic detection precision, measurement is carried out in to milk heating process to the milk ultrasonic parameter, the milk ultrasonic parameter is to set up with the ultrasonic parameter at a plurality of temperature spots of milk place with related calibration model between milk principal ingredient concentration, each constituent concentration of unknown concentration milk be use with the modeling uniform temp under the related calibration model of ultrasonic parameter substitution that measures calculate, it is characterized in that: related calibration model is:
S F = k F + Σ i = 1 n k Fi c i + Σ i = 1 n k αi α i S P = k P + Σ i = 1 n k Pi c i + Σ i = 1 n k qi α i
S in the formula F, S PMass percent concentration for fat and protein in the milk; c iFor milk at 20 ℃ of velocities of sound during i temperature between 40 ℃, the m/s of unit; α iFor milk at 20 ℃ of ultrasonic attenuation coefficients during i temperature between 40 ℃, the dB/cm of unit; k F, k Fi, k α i, k P, k Pi, k QiBe regression coefficient, n counts for the temperature of measuring ultrasonic parameter, and described ultrasonic parameter refers to the velocity of sound, ultrasonic attenuation coefficient.
2, the method for raising milk quality ultrasonic detection precision according to claim 1 is characterized in that, heating process is that milk temperature heats from low to high from 20 ℃ to 40 ℃, and carries out the measurement of ultrasonic parameter in heating process.
3, the method for raising milk quality ultrasonic detection precision according to claim 1 is characterized in that, the ultrasonic parameter that is used for modeling is the ultrasonic parameter of two or more temperature spots of milk from 20 ℃ to 40 ℃.
4, the method for raising milk quality ultrasonic detection precision according to claim 1, it is characterized in that, related calibration model be from 20 ℃ to 40 ℃ the multiple linear regression model set up of the offset minimum binary 2 type PLS2 algorithms of the velocity of sound of two or more temperature spots of milk and attenuation coefficient.
5, a kind of testing tool that improves milk quality ultrasonic detection precision comprises: main control module, ultrasound emission circuit module, ultrasonic receiving circuit module, ultrasonic reception and transmitting probe, sample cell, temperature test circuit module, heating control module, the auto injection module be made up of multi-functional microprocessor; Main control module links to each other with ultrasound emission circuit module, ultrasonic receiving circuit module, temperature test circuit module, heating control module, auto injection module respectively; The ultrasound emission circuit module connects the ultrasound emission probe, ultrasonic receiving circuit module connects ultrasonic receiving transducer; The sample introduction signal that main control module produces sends to the auto injection module, the beginning heating signal that main control module produces sends to heating control module, the detected temperature signal of temperature test circuit module sends to main control module, the control signal that main control module produces sends to the ultrasound emission circuit module, the signal that ultrasonic receiving circuit module receives is sent to main control module, the heating signal that stops that main control module produces when measuring end is sent to heating control module, the velocity of sound that main control module calculates, attenuation coefficient is sent to memory storage, main control module passes through output display device, printing equipment and be used to connect computer by serial test result is exported, it is characterized in that, the velocity of sound that described main control module calculates, attenuation coefficient is that described main control module default temperature spot heating control module arrives 20 ℃ to 40 ℃ from 20 ℃ to 40 ℃ the heating process carries out; Described main control module calculates test result according to the forecast model of following fatty consistency and protein concentration:
S F = k F + Σ i = 1 n k Fi c i + Σ i = 1 n k αi α i S P = k P + Σ i = 1 n k Pi c i + Σ i = 1 n k qi α i
S in the formula F, S PMass percent concentration for fat and protein in the milk; c iFor milk at 20 ℃ of velocities of sound during i temperature between 40 ℃, the m/s of unit; α iFor milk at 20 ℃ of ultrasonic attenuation coefficients during i temperature between 40 ℃, the dB/cm of unit; k F, k Fi, k α i, k P, k Pi, k QiBe regression coefficient, n counts for the temperature of measuring ultrasonic parameter.
CNB2007100572655A 2007-04-29 2007-04-29 Improve the method and the detecting instrument of milk quality ultrasonic detection precision CN100573133C (en)

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