CN107014874A - A kind of determination methods of fresh milk freshness date - Google Patents
A kind of determination methods of fresh milk freshness date Download PDFInfo
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- CN107014874A CN107014874A CN201710313205.9A CN201710313205A CN107014874A CN 107014874 A CN107014874 A CN 107014874A CN 201710313205 A CN201710313205 A CN 201710313205A CN 107014874 A CN107014874 A CN 107014874A
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- milk
- temperature
- conductivity
- fresh milk
- freshness date
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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
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/20—Investigating the presence of flaws
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C1/00—Registering, indicating or recording the time of events or elapsed time, e.g. time-recorders for work people
- G07C1/10—Registering, indicating or recording the time of events or elapsed time, e.g. time-recorders for work people together with the recording, indicating or registering of other data, e.g. of signs of identity
- G07C1/12—Registering, indicating or recording the time of events or elapsed time, e.g. time-recorders for work people together with the recording, indicating or registering of other data, e.g. of signs of identity wherein the time is indicated in figures
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
A kind of fresh milk freshness date determination methods, constantly the storage time under the storage time reduction to normal temperature under Current Temperatures and added up, by comparing the storage time at a temperature of accumulated standard and the freshness date under normal temperature, judge whether in freshness date, it is characterised in that：It is appropriately arranged with sample detecting cycle and sample detecting resolution ratio so that conductivity variations caused by the change of milk temperature can be detected within the cycle, and conductivity variations can be ignored caused by milk qualitative change；Described Current Temperatures are the initial conductivity fresh milk temperature corresponding with accumulative conductivity increase sum of fresh milk, and described conductivity increase is the conductivity variations amount that can record within the sampling period.The present invention dexterously eliminates interference of the milk qualitative change to judgement Current Temperatures compared with prior art, with influence of the temperature to milk qualitative change is accurately reflected, accurately judges the advantageous effects of the freshness of fresh milk.
Description
Technical field
The present invention relates to food security, and in particular to the freshness date determination methods of fresh milk.
Background technology
Disclosed in China Patent No. 2017102902850《A kind of freshness date determination methods》Existed there is provided one kind with fresh milk
Under normal temperature, the time on the basis of the time used in freshness date is reached, the storage time reduction of fresh milk at different temperatures is arrived
Storage time under normal temperature, then the freshness date determination methods contrasted with the said reference time, described reduction is basis
The current electrical conductivity of fresh milk, which is tabled look-up, obtains current milk temperature, further according to the qualitative change under the qualitative change speed under current milk temperature and normal temperature
The ratio of speed, or the ratio of the freshness date of fresh milk is converted under the freshness date and Current Temperatures of fresh milk under normal temperature, by
Increased part caused by milk temperature rise may not only be contained in current electrical conductivity, it is also possible to which declining comprising milk matter causes increase
Part, so the corresponding milk temperature of current conductivity, could possibly be higher than current milk temperature, therefore, in reduction under used current milk temperature
Qualitative change speed could possibly be higher than the corresponding qualitative change speed of currently practical milk temperature, reduction result mistake is occurred, cause freshness date to be sentenced
Dislocation is missed.
The content of the invention
It is contemplated that the method for fresh milk freshness date can accurately be judged there is provided a kind of by overcoming the above-mentioned deficiency of prior art,
The technical scheme is that：A kind of fresh milk freshness date determination methods, constantly the storage time reduction under Current Temperatures to mark
Storage time at quasi- temperature is simultaneously added up, by comparing the storage time at a temperature of accumulated standard and the guarantor under normal temperature
The fresh phase, judge whether in freshness date, be appropriately arranged with sample detecting cycle and sample detecting resolution ratio so that can within the cycle
To detect the change of the caused electrical conductivity of milk temperature change or related parameter, and electrical conductivity or correlation are joined caused by milk qualitative change
The change of variable can be ignored；Described Current Temperatures are corresponding with accumulative conductivity increase sum for the initial conductivity of fresh milk
Fresh milk temperature, described conductivity increase is the conductivity variations amount that can record within the sampling period；Described current temperature
The corresponding fresh milk temperature of the corresponding related parameter of initial conductivity parameter sigma delta sum related to this for fresh milk is spent,
The described related parameter increment is the related parameter variable quantity that can record within the sampling period.
The temperature Current Temperatures in reduction being defined as from prior art corresponding to the current electrical conductivity of fresh milk is different, this
Current Temperatures in reduction are defined as fresh milk initial conductivity and the temperature corresponding to accumulative conductivity increase sum, profit by invention
With the difference of milk temperature and milk matter pace of change, by rationally setting the sampling period, milk qualitative change is dexterously eliminated to judging to work as
The interference of preceding temperature, with influence of the temperature to milk qualitative change is accurately reflected, accurately judges the beneficial skill of the freshness of fresh milk
Art effect.
Brief description of the drawings
Fig. 1 is the embodiment of the present invention 1
Fig. 2 is the embodiment of the present invention 2.
Embodiment
The present invention will be described in detail with reference to the accompanying drawings and examples.
Embodiment 1
Referring to Fig. 1, the present embodiment is a kind of single-chip microcomputer control program of fresh milk freshness date display device, wherein, step 1 is initial
Subroutine, for when upper electric, output " 1 " to show that fresh milk is in freshness date, and accumulative electrical conductivity register, Yuan You electricity
Conductance register and accumulative storage time register are reset；Step 2 is time delay subroutine, the interval time for setting sampling
Td, the present embodiment sets Td=30s, and the present embodiment temperature applicable range is 4 ~ 34 DEG C, the conductivity variations scope of correspondence fresh milk
3.02 ~ 6.02 × 103 μ s/cm, from the single-chip microcomputer of built-in 9 bit A/D converter, setting measurement accuracy is minimum resolution 3.00/
The μ s/cm of 512 × 103 μ s/cm ≈ 0.006 × 103, from the test data of following fresh milk storage temperatures and freshness date relation and cold
But test data:
temperature 0℃ 2℃ 4℃ 6℃ 8℃ 10℃ 12℃ 14℃ 16℃
Fresh time 192h 180h 160h 146h 121h 98h 80h 75h 60h
temperature 18℃ 20℃ 22℃ 24℃ 26℃ 28℃ 30℃ 32℃ 34℃
Fresh time 55h 46h 42h 30h 22h 12h 6h 2.5h 1h
Time/min 05 10 15 25 35 45 55 65 70
Temperature/DEG C 100 71 55 45 35 28 24 22 22 22
Understand, when milk temperature reaches 34 DEG C, milk qualitative change causes the conductivity variations speed to be 0.3 × 103 μ s/cm per hour, i.e.,
0.005 × 103 μ s/cm of change per minute, less than the minimum resolution of 9 bit A/D converters, therefore, as long as sampling period Td≤
1min ensures that conductivity variations caused by milk qualitative change are sufficiently small, so that it cannot collect.At the same time it can also see
Go out, the most jogging speed of about 0.17 DEG C of temperature change most jogging speed/conductivity variations caused by min, i.e. temperature is per minute
0.017 × 103 μ s/cm, as long as therefore sampling period Td >=0.29min ensures that conductivity variations caused by temperature change
It is collected.Therefore, the present embodiment delay time be sampling period Td span for 0.5 min ~ 1min, i.e. 20 s ~
60s.The detection that step 3 is used for port voltage U is sampled；Step 4 is used to obtain corresponding fresh milk conductivityσ t according to sampled voltage；
Step 5 is used to, by the increment σ t- σ 0 of former accumulative electrical conductivity and electrical conductivity, obtain currently adding up electrical conductivity Σ σ；Step 6 is used for more
Newly deposit the register of original conductivityσ 0；Step 7, which is used to be tabled look-up according to currently accumulative electrical conductivity Σ σ, to be obtained under corresponding temperature
Freshness date Tp；Step 8 is used to be obtained by the delay time at a temperature of original accumulative storage time and this reduction to normal storage
Currently add up storage time, wherein, described Tb and Σ T are respectively freshness date time span and accumulative storage at a temperature of normal storage
Deposit the time；Step 9 is used to judge whether above-mentioned accumulative storage time exceeds freshness date, is to jump out circulation, otherwise holds again
Row step 2-9；Step 10 is used to export " 0 " to be showed more than freshness date；Compared with prior art, the present embodiment can exclude milk
Interference and mistake of the conductivity variations caused by qualitative change caused by for judging milk temperature and its corresponding freshness date according to electrical conductivity
Difference, can more accurately reflect influence of the temperature to fresh milk freshness date, consumer can be made to understand the freshness of fresh milk exactly.
Embodiment 2
Referring to Fig. 2, the present embodiment and the difference of embodiment 1 are essentially consisted in：By detection sampled voltage U and fresh milk conductivityσ's relation
Tables of data TAB (Σ U, Tp) is made with TAB (Σ σ, Tp), directly to detect the obtained input port voltage i.e. U that samples as control
Variable, benefit is simplified program.
It is pointed out that the equivalent transformation that every utilization description of the invention and accompanying drawing content are done, or identical essence
The different expression of implication, and directly or indirectly it is used in other related technical fields, the patent protection model in the present invention
In enclosing.
Claims (1)
1. a kind of fresh milk freshness date determination methods, constantly the storage under the storage time reduction to normal temperature under Current Temperatures
Time is simultaneously added up, and by comparing the storage time at a temperature of accumulated standard and the freshness date under normal temperature, is judged whether
In freshness date, it is characterised in that：It is appropriately arranged with sample detecting cycle and sample detecting resolution ratio so that can be with the cycle
The change of the caused electrical conductivity of milk temperature change or related parameter is detected, and electrical conductivity or related ginseng become caused by milk qualitative change
The change of amount can be ignored；Described Current Temperatures are corresponding with accumulative conductivity increase sum for the initial conductivity of fresh milk
Fresh milk temperature, described conductivity increase is the conductivity variations amount that can record within the sampling period；Described Current Temperatures
For the corresponding fresh milk temperature of the corresponding related parameter of initial conductivity parameter sigma delta sum related to this of fresh milk, institute
The related parameter increment stated is the related parameter variable quantity that can record within the sampling period.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710313205.9A CN107014874A (en) | 2017-05-05 | 2017-05-05 | A kind of determination methods of fresh milk freshness date |
| PCT/CN2017/108315 WO2018201680A1 (en) | 2017-05-05 | 2017-10-30 | Method for determining shelf life of milk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710313205.9A CN107014874A (en) | 2017-05-05 | 2017-05-05 | A kind of determination methods of fresh milk freshness date |
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| Publication Number | Publication Date |
|---|---|
| CN107014874A true CN107014874A (en) | 2017-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710313205.9A Pending CN107014874A (en) | 2017-05-05 | 2017-05-05 | A kind of determination methods of fresh milk freshness date |
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| WO (1) | WO2018201680A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018201680A1 (en) * | 2017-05-05 | 2018-11-08 | 卢润侨 | Method for determining shelf life of milk |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105842409A (en) * | 2016-03-21 | 2016-08-10 | 四川长虹电器股份有限公司 | Egg freshness degree distinguishing system and method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2898549A (en) * | 1954-12-10 | 1959-08-04 | Wendell S Miller | Means and techniques for determining quality of milk |
| CN203870057U (en) * | 2014-04-18 | 2014-10-08 | 江西科技学院 | Milk quality monitoring instrument capable of adopting liquid electric conductivity to make judgment |
| CN107014874A (en) * | 2017-05-05 | 2017-08-04 | 卢润侨 | A kind of determination methods of fresh milk freshness date |
-
2017
- 2017-05-05 CN CN201710313205.9A patent/CN107014874A/en active Pending
- 2017-10-30 WO PCT/CN2017/108315 patent/WO2018201680A1/en active Application Filing
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105842409A (en) * | 2016-03-21 | 2016-08-10 | 四川长虹电器股份有限公司 | Egg freshness degree distinguishing system and method |
Non-Patent Citations (2)
| Title |
|---|
| 丁伟等: ""电导率仪在牛奶检验中的应用"", 《中国乳品工业》 * |
| 安莱立思仪器科技（上海）有限公司: ""电导率仪在牛奶掺假检验中的应用"", 《中国环保在线》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018201680A1 (en) * | 2017-05-05 | 2018-11-08 | 卢润侨 | Method for determining shelf life of milk |
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| WO2018201680A1 (en) | 2018-11-08 |
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