CN104614409A - Milk powder detection method and device based on Internet-of-Things technology - Google Patents
Milk powder detection method and device based on Internet-of-Things technology Download PDFInfo
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- CN104614409A CN104614409A CN201510025921.8A CN201510025921A CN104614409A CN 104614409 A CN104614409 A CN 104614409A CN 201510025921 A CN201510025921 A CN 201510025921A CN 104614409 A CN104614409 A CN 104614409A
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- milk powder
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Abstract
The invention discloses a milk powder detection method and device based on the Internet-of-Things technology. The device comprises a controller as well as a keyboard, an LCD, a temperature sensor, a clock generation module and a power supply control module which are connected with the controller, wherein the controller is also electrically connected with an A/D converter, the A/D converter is electrically connected with a phase-sensitive detector, the phase-sensitive detector is electrically connected with an electrode device through an amplifier, and positive and negative pole pieces of the electrode device are connected with an excitation source. The detection method and device detect milk powder through detecting the change relation between the electrical conductivity and the temperature of a milk powder solution and have the very high reference values for distinguishing the milk powder, and a convenient milk powder detection method is provided for consumers.
Description
Technical field
The present invention relates to the detection of milk powder, particularly a kind of milk powder detection method based on technology of Internet of things and device.
Background technology
Conductivity also claims than conductance, is normally 1cm with area
2, die opening is that the two parallel metal sheets of 1cm insert in solution and measure two interpolar resistivity sizes and determine, is the inverse of resistivity.The organization of conductivity is western every centimetre (s/cm), in water quality and liquid electric conductivity are measured, commonly uses its 10
-6, namely micro-every centimetre, west (us/cm) represents conductivity value.
In stable milk power solution, at different time, at same temperature, its conductivity should be certain certain value, and when solution concentration is constant, along with the change of temperature, conductivity also should change thereupon.Therefore by measuring conductivity, just can grasp the production technology of milk powder very easily, and when quality problems appear in milk powder, its electrical conductivity of solution can be surveyed to make anomaly analysis.
Summary of the invention
The object of the invention is the above-mentioned defect for prior art, a kind of sample point of conductivity and temperature relation by measuring milk power solution to be checked being provided, then contrasting the system providing the milk powder true and false to detect with typical curve.
For solving the problems referred to above of prior art, technical scheme provided by the invention is: a kind of milk powder detection method based on technology of Internet of things and device, comprise controller, the key board be connected with controller, LCD display, temperature sensor, clock generating module and energy supply control module, described controller is also electrically connected with an A/D converter, A/D converter is electrically connected a phase-sensitive detector (PSD), phase-sensitive detector (PSD) is electrically connected with an electrode device by amplifier, and the positive/negative plate of electrode device connects driving source.
One as the milk powder detection method and device that the present invention is based on technology of Internet of things is improved, and the temperature sense scope of described temperature sensor is 0 DEG C ~ 100 DEG C, and the temperature-sensitive precision of described temperature sensor is 0.1 DEG C.
One as the milk powder detection method and device that the present invention is based on technology of Internet of things is improved, described driving source is the sine wave that signal generator produces, this sine wave is successively through amplifier, phase-sensitive detector (PSD), A/D converter, and A/D converter converts the simulating signal of collection to digital signal and is input in controller.
Another object of the present invention is to provide a kind of milk powder detection method based on technology of Internet of things and device, comprises the following steps:
A, feeding; Obtain the solution sample of genuine piece milk powder; Obtain milk powder sample solution to be checked;
B, the conductivity surveying the solution sample of the genuine piece milk powder in steps A and temperature, the temperature of genuine piece milk power solution in conversion step A, measures the sample point of the multiple conductivity of solution and temperature relation;
C, sample point by measuring in step B, the number of times of judgment curves, then goes out the conductivity of genuine piece milk power solution and the typical curve of temperature variation relation with least square fitting;
D, measure the conductivity of milk powder sample solution to be checked and the sample point of temperature variation relation;
E, by being contrasted by the typical curve in the conductivity of the milk power solution to be checked recorded in step D and the sample point of temperature variation relation and step C, determine the true and false of tested milk powder.
The method of testing of the milk powder true and false is distinguished as the present invention, it is characterized in that, solution and the milk powder sample solution solvent for use to be checked of the genuine piece milk powder in described steps A are Drinking Water, the solution concentration of the solution of genuine piece milk powder and the solution concentration of milk powder sample solution to be checked all control between 5% ~ 20%, and the initial temperature of solution is 90 DEG C.
One as the milk powder detection method and device that the present invention is based on technology of Internet of things is improved, the solution of the genuine piece milk powder in the conversion step A in described step B record standard solution from 90 DEG C by temperature sensor, gather a standard solution conductivity sample point when often reducing by 1 DEG C.
One as this milk powder detection method based on technology of Internet of things and device is improved, in described step C, point larger for the sample point medial error recorded is rejected, then the number of times of curve is judged, the conductivity of genuine piece milk power solution and the typical curve of temperature variation is gone out, as the contrast standard detecting other samples finally by least square fitting.
One as the milk powder detection method and device that the present invention is based on technology of Internet of things is improved, the conductivity of 10 milk power solutions to be measured and the check point of temperature relation is recorded in described step e, then by 10 check points, respectively with synthermal under 3 typical curves on point to invert difference, then average, finally with the curve that the unfavourable balance mean value of 10 check points is minimum, as typical curve; Then the point detected all does unfavourable balance with the point of the corresponding temperature on this curve, considers the problem of metrical error, therefore the milk powder meeting genuine piece feature is thought in checkpoint and standard point error milk powder within the specific limits, namely thinks genuine piece.
One as the milk powder detection method and device that the present invention is based on technology of Internet of things is improved, and the described conductivity of genuine piece milk power solution and the typical curve of temperature variation choose three, are respectively 1 curve, 2 curves and 3 curves.
Compared with prior art, advantage of the present invention is: the present invention is the true and false being detected milk powder by the detection conductivity of milk power solution and the variation relation of temperature, the true and false of milk powder is distinguished there is very high reference value, for consumer provides a method detecting milk powder easily.The sample point of conductivity and temperature relation measures, and utilizes the sample point recorded to carry out the number of times of judgment curves, then goes out the conductivity of genuine piece milk power solution and the typical curve of temperature relation by least square fitting.By the sample point of the conductivity and temperature relation that measure milk power solution to be checked during application, then contrast the reference method providing the milk powder true and false to detect with typical curve.
Accompanying drawing explanation
Fig. 1 is typical curve process of establishing process flow diagram of the present invention.
Fig. 2 is the present invention's milk powder testing process to be checked process flow diagram.
Fig. 3 is the functional structure frame diagram of test macro in the present invention.
Embodiment
Just the invention will be further described with reference to the accompanying drawings below.
As depicted in figs. 1 and 2, first in the present invention, obtain the milk power solution of a standard, milk powder must be genuine piece milk powder sample, and the domestic water meeting country's mark selected by solvent, and concentration controls between 5% ~ 20%, is as the criterion so that measure conductivity.
Step S1: the conductivity of standard solution from 90 DEG C of surveys, as initial value.
Step S2: measure a corresponding conductivity when temperature of standard solution often reduces by 1 DEG C, as master sample point (x
i, y
i).
Step S3: by controller, timer every 1s, the temperature value of temperature sensor measurement once current solution, then judges whether the temperature of Current standards solution reduces 1 DEG C.
Step S4: if the temperature of standard solution reduces 1 DEG C just measure the conductivity of the standard solution under Current Temperatures; Otherwise, continue to wait for solution cooling.
Step S5: whether the solution temperature of criterion solution drops to 0 DEG C, continues to wait for cooling if do not drop to 0 DEG C, measures the conductivity of relevant temperature point, just stops conductivity detecting until drop to 0 DEG C.
Step S6: by sample point matching 3 typical curves of the temperature that records and conductivity relation, as formula (1), (2), (3), simulate 1 time, 2 times, 3 times curves respectively.
y
i＝β
0+β
1x
i 1
(1)
y
i＝β
0+β
1x
i 1+β
2x
i 2
(2)
y
i＝β
0+β
1x
i 1+β
2x
i 2+β
3x
i 3
(3)
Wherein β
0, β
1, β
2, β
3be curvilinear equation parameter, n is sample point number.We, first for curve, i.e. a n=1, as formula (1), can obtaining formula (4) by least square method, by asking local derviation to draw normal matrix to formula (4), can obtain β
0, β
1match value
substitute into formula (1) and can y be obtained
imatch value
pass through
just can obtain residual error as formula (5), finally the residual error of the curve of different number of times be compared, get the less curve of residual error as typical curve.
After having had typical curve, we just can detect the temperature of measuring samples and the value of conductivity, and then contrast with typical curve, concrete step is as follows.
Step K 1: obtain solution to be measured according to obtaining the method for standard solution, the then random conductivity value recorded at 10 temperature, the domestic water meeting country's mark selected by solvent, and concentration controls between 5% ~ 20%.
Step K 2: by 10 points recorded, does unfavourable balance with the point of 3 typical curve corresponding temperatures respectively, then asks the average of 10 unfavourable balances.
Step K 3: the average comparing 3 typical curve unfavourable balances, select unfavourable balance average minimum as typical curve.
Step K 4: the conductivity of follow-up check point and typical curve corresponding temperature is done unfavourable balance, the unfavourable balance recording multiple point is averaged.
Step K 5: consider the error that may exist in each measurement, the unfavourable balance average in step K 4 is done error judgment.
Step K 6: if unfavourable balance is less than 1% think that this milk powder is true milk powder.
Step K 7: if unfavourable balance is greater than 1% think that this milk powder is false milk powder.
As shown in Figure 3, a kind of milk powder detection method based on technology of Internet of things and device, comprise controller, the key board be connected with controller, LCD display, temperature sensor, clock generating module and energy supply control module, described controller is also electrically connected with an A/D converter, A/D converter is electrically connected a phase-sensitive detector (PSD), and phase-sensitive detector (PSD) is electrically connected with an electrode device by amplifier, and the positive/negative plate of electrode device connects driving source.
The temperature sense scope of temperature sensor is 0 DEG C ~ 100 DEG C, and the temperature-sensitive precision of described temperature sensor is 0.1 DEG C.
Driving source is the sine wave that signal generator produces, and this sine wave is successively through amplifier, phase-sensitive detector (PSD), A/D converter, and A/D converter converts the simulating signal of collection to digital signal and is input in controller.
The principle of native system is: first produce the driving source of a sine wave as system by signal generator, because the signal gathered can be fainter, and there are some undesired signals, therefore the signal collected also will through amplifying, detection, just can be input in A/D converter after filtering process, then A/D converter converts the simulating signal collected to digital signal and is input in controller, data processing is carried out in conjunction with the temperature value collected, wherein, temperature sensor measurement scope is between 0 DEG C ~ 100 DEG C, precision 0.1 DEG C is just passable, finally in liquid crystal display display result.
Claims (9)
1. the milk powder detection method based on technology of Internet of things and device, it is characterized in that, comprise controller, the key board be connected with controller, LCD display, temperature sensor, clock generating module and energy supply control module, described controller is also electrically connected with an A/D converter, A/D converter is electrically connected a phase-sensitive detector (PSD), and phase-sensitive detector (PSD) is electrically connected with an electrode device by amplifier, and the positive/negative plate of electrode device connects driving source.
2. the milk powder detection method based on technology of Internet of things according to claim 1 and device, is characterized in that, the temperature sense scope of described temperature sensor is 0 DEG C ~ 100 DEG C, and the temperature-sensitive precision of described temperature sensor is 0.1 DEG C.
3. the milk powder detection method based on technology of Internet of things according to claim 1 and device, it is characterized in that, described driving source is the sine wave that signal generator produces, this sine wave is successively through amplifier, phase-sensitive detector (PSD), A/D converter, and A/D converter converts the simulating signal of collection to digital signal and is input in controller.
4., based on milk powder detection method and the device of technology of Internet of things, it is characterized in that, comprise the following steps:
A, feeding; Obtain the solution sample of genuine piece milk powder; Obtain milk powder sample solution to be checked;
B, the conductivity surveying the solution sample of the genuine piece milk powder in steps A and temperature, the temperature of genuine piece milk power solution in conversion step A, measures the sample point of the multiple conductivity of solution and temperature relation;
C, sample point by measuring in step B, the number of times of judgment curves, then goes out the conductivity of genuine piece milk power solution and the typical curve of temperature variation relation with least square fitting;
D, measure the conductivity of milk powder sample solution to be checked and the sample point of temperature variation relation;
E, by being contrasted by the typical curve in the conductivity of the milk power solution to be checked recorded in step D and the sample point of temperature variation relation and step C, determine the true and false of tested milk powder.
5. the milk powder detection method based on technology of Internet of things according to claim 4 and device, it is characterized in that, solution and the milk powder sample solution solvent for use to be checked of the genuine piece milk powder in described steps A are Drinking Water, the solution concentration of the solution of genuine piece milk powder and the solution concentration of milk powder sample solution to be checked all control between 5% ~ 20%, and the initial temperature of solution is 90 DEG C.
6. the milk powder detection method based on technology of Internet of things according to claim 4 and device, it is characterized in that, the solution of the genuine piece milk powder in the conversion step A in described step B record standard solution from 90 DEG C by temperature sensor, gather a standard solution conductivity sample point when often reducing by 1 DEG C.
7. the milk powder detection method based on technology of Internet of things according to claim 4 and device, it is characterized in that, in described step C, point larger for the sample point medial error recorded is rejected, then the number of times of curve is judged, the conductivity of genuine piece milk power solution and the typical curve of temperature variation is gone out, as the contrast standard detecting other samples finally by least square fitting.
8. the milk powder detection method based on technology of Internet of things according to claim 4 and device, it is characterized in that, the conductivity of 10 milk power solutions to be measured and the check point of temperature relation is recorded in described step e, then by 10 check points, respectively with synthermal under 3 typical curves on point to invert difference, then average, finally with the curve that the unfavourable balance mean value of 10 check points is minimum, as typical curve; Then the point detected all does unfavourable balance with the point of the corresponding temperature on this curve, considers the problem of metrical error, therefore the milk powder meeting genuine piece feature is thought in checkpoint and standard point error milk powder within the specific limits, namely thinks genuine piece.
9. the milk powder detection method based on technology of Internet of things according to claim 7 and device, is characterized in that, the described conductivity of genuine piece milk power solution and the typical curve of temperature variation choose three, is respectively 1 curve, 2 curves and 3 curves.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109381038A (en) * | 2017-08-04 | 2019-02-26 | 广东美的生活电器制造有限公司 | Food processor and its warm milk control method and device |
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