WO2018201680A1 - 一种鲜奶保鲜期的判断方法 - Google Patents

一种鲜奶保鲜期的判断方法 Download PDF

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WO2018201680A1
WO2018201680A1 PCT/CN2017/108315 CN2017108315W WO2018201680A1 WO 2018201680 A1 WO2018201680 A1 WO 2018201680A1 CN 2017108315 W CN2017108315 W CN 2017108315W WO 2018201680 A1 WO2018201680 A1 WO 2018201680A1
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milk
temperature
conductivity
period
change
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卢润侨
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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
    • 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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  • the invention relates to food safety, and particularly relates to a method for judging the fresh-keeping period of fresh milk.
  • the Chinese Patent No. 2017102902850 discloses a method for judging the fresh-keeping period, which provides a reference time for the storage time of fresh milk at different temperatures, based on the time taken for the fresh milk to reach the fresh-keeping period at the standard temperature.
  • the storage time at the standard temperature, and the method for judging the freshness period compared with the above reference time, the reduction is based on the current conductivity of the fresh milk to obtain the current milk temperature, and then according to the current temperature and quality of the milk temperature and the standard
  • the ratio of the rate of mass change at temperature, or the ratio of the shelf life of fresh milk at standard temperature to the shelf life of fresh milk at the current temperature since the current conductivity may not only contain an increase in milk temperature, but also It may include a decrease in milk quality, so the milk temperature corresponding to the current conductivity may be higher than the current milk temperature. Therefore, the mass change rate at the current milk temperature used in the reduction may be higher than the current normal milk temperature. The speed causes the returning result to be wrong, resulting in a mistake in
  • the invention aims to overcome the above-mentioned deficiencies of the prior art, and provides a method for accurately determining the fresh-keeping period of fresh milk.
  • the technical scheme of the present invention is: a method for judging the fresh-keeping period of fresh milk, continuously averaging the storage time at the current temperature. Calculate the storage time at the standard temperature and accumulate it. By comparing the storage time under the accumulated standard temperature with the shelf life at the standard temperature, determine whether the sampling detection period and the sampling detection resolution are properly set during the fresh-keeping period. During this period, changes in conductivity or related parameters caused by changes in milk temperature can be detected, and changes in conductivity or related parameters caused by changes in milk quality can be ignored; the current temperature is the initial conductivity of fresh milk.
  • the fresh milk temperature corresponding to the sum of the cumulative conductivity increments wherein the conductivity increase is a change in conductivity that can be recorded during the sampling period; the current temperature is a correlation corresponding to the initial conductivity of fresh milk.
  • the fresh milk temperature corresponding to the sum of the cumulative increments of the relevant variables, the related parameter increment being the recordable period during the sampling period Off parametric variation of variables.
  • the current temperature in the reduction is defined as the temperature corresponding to the current conductivity of fresh milk
  • the present invention defines the current temperature in the reduction as the sum of the initial conductivity of fresh milk and the cumulative conductivity increase.
  • Corresponding temperature using the difference between milk temperature and milk quality change speed, through reasonable setting of sampling period, subtly eliminate the interference of milk quality change to determine the current temperature, accurately reflect the influence of temperature on milk quality change, accurately judge fresh milk The beneficial effect of the freshness of the technology.
  • Figure 1 is a first embodiment of the present invention
  • Figure 2 is a second embodiment of the present invention.
  • the embodiment is a single-chip microcomputer control program for a fresh milk fresh-keeping period display device, wherein step 1 is an initialization sub-routine for outputting “1” to display fresh milk during the fresh-keeping period. And the cumulative conductivity register, the original conductivity register and the accumulated storage time register are cleared; step 2 is a delay subroutine, which is used to set the sampling interval time Td.
  • Td 30s is set, and the temperature of this embodiment is applicable.
  • the range is 4 ⁇ 34°C, and the conductivity range of fresh milk is 3.02 ⁇ 6.02 ⁇ 10 3 ⁇ s/cm.
  • the single-chip microcomputer with built-in 9-bit AD converter is selected to set the measurement accuracy to the minimum resolution of 3.00/512 ⁇ 10 3 ⁇ s/ Cm ⁇ 0.006 ⁇ 10 3 ⁇ s/cm, from the following test data and cooling test data for the relationship between fresh milk storage temperature and shelf life:
  • the rate of change of conductivity caused by the change of milk quality is 0.3 ⁇ 10 3 ⁇ s/cm per hour, that is, 0.005 ⁇ 10 3 ⁇ s/cm per minute, and the minimum resolution of less than 9-bit AD converter.
  • the rate therefore, as long as the sampling period Td ⁇ 1min can ensure that the change in conductivity caused by milk changes is small enough to be collected.
  • the slowest temperature change is about 0.17 ° C / min, that is, the slowest rate of change in conductivity caused by temperature is 0.017 ⁇ 10 3 ⁇ s / cm per minute, so as long as the sampling period Td ⁇ 0.29min It is ensured that the conductivity change caused by the temperature change is collected. Therefore, the delay time of the embodiment, that is, the sampling period Td ranges from 0.5 min to 1 min, that is, 20 s-60 s.
  • the difference between the embodiment and the embodiment 1 is mainly: the data table TAB ( ⁇ U, Tp) is prepared by detecting the relationship between the sampling voltage U and the fresh milk conductivity ⁇ and TAB ( ⁇ , Tp), and directly detecting The sampled input port voltage, U, is the control variable, and the benefit is to simplify the program.

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Abstract

一种鲜奶保鲜期判断方法，不断把当前温度下的储存时间归算到标准温度下的储存时间并进行累计，通过比对累计标准温度下的储存时间与标准温度下的保鲜期，判断是否在保鲜期内，适当设置采样检测周期和采样检测分辨率，使得在该周期内可以检测到奶温变化导致的电导率或相关参变量的变化，而奶质变化导致的电导率或相关参变量的变化可以被忽略；所述的当前温度为鲜奶的初始电导率与累计电导率增量之和对应的鲜奶温度，所述的电导率增量是在采样周期内可记录到的电导率变化量；所述的当前温度为鲜奶的初始电导率对应的相关参变量与该相关参变量累计增量之和对应的鲜奶温度，所述的该相关参变量增量是在采样周期内可记录到的该相关参变量变化量。与现有技术把归算中的当前温度定义为鲜奶当前的电导率所对应的温度不同，本发明把归算中的当前温度定义为鲜奶初始电导率与累计电导率增量之和所对应的温度，利用奶温与奶质变化速度的区别，通过合理设置采样周期，巧妙地排除了奶质变化对判定当前温度的干扰，具有准确反映温度对奶质变化的影响，准确判断鲜奶的新鲜程度的有益技术效果。

Description

一种鲜奶保鲜期的判断方法 技术领域
本发明涉及食品安全，具体涉及鲜奶的保鲜期判断方法。
背景技术
中国专利号2017102902850公开的《一种保鲜期判断方法》，提供了一种以鲜奶在标准温度下，达到保鲜期所用的时间为基准时间，把鲜奶在不同温度下的储存时间归算到在标准温度下的储存时间，再与上述基准时间对比的保鲜期判断方法，所述的归算是根据鲜奶当前的电导率查表得到当前奶温，再根据当前奶温下的质变速度与标准温度下的质变速度的比值，或标准温度下鲜奶的保鲜期与当前温度下鲜奶的保鲜期的比值进行折算，由于当前的电导率可能不仅含有奶温升高所导致增加的部分，还可能包含奶质下降导致增加部分，所以当前电导率对应的奶温，可能高于当前奶温，因此，归算中所用到的当前奶温下的质变速度可能高于当前实际奶温对应的质变速度，使归算结果出现错误，导致保鲜期判断错误。
发明内容
本发明旨在克服现有技术的上述不足，提供一种能准确判断鲜奶保鲜期的方法，本发明的技术方案是：一种鲜奶保鲜期判断方法，不断把当前温度下的储存时间归算到标准温度下的储存时间并进行累计，通过比对累计标准温度下的储存时间与标准温度下的保鲜期，判断是否在保鲜期内，适当设置采样检测周期和采样检测分辨率，使得在该周期内可以检测到奶温变化导致的电导率或相关参变量的变化，而奶质变化导致的电导率或相关参变量的变化可以被忽略；所述的当前温度为鲜奶的初始电导率与累计电导率增量之和对应的鲜奶温度，所述的电导率增量是在采样周期内可记录到的电导率变化量；所述的当前温度为鲜奶的初始电导率对应的相关参变量与该相关参变量累计增量之和对应的鲜奶温度，所述的该相关参变量增量是在采样周期内可记录到的该相关参变量变化量。
与现有技术把归算中的当前温度定义为鲜奶当前的电导率所对应的温度不同，本发明把归算中的当前温度定义为鲜奶初始电导率与累计电导率增量之和所对应的温度，利用奶温与奶质变化速度的区别，通过合理设置采样周期，巧妙地排除了奶质变化对判定当前温度的干扰，具有准确反映温度对奶质变化的影响，准确判断鲜奶的新鲜程度的有益技术效果。
附图说明
图1是本发明实施例1
图2是本发明实施例2。
具体实施方式
下面结合附图和实施例对本发明进行详细描述。
实施例1
参见图1，本实施例为一种鲜奶保鲜期显示装置的单片机控制程序，其中，步骤1为初始化子程序，用于在上电时，输出“1”显示鲜奶处在保鲜期内，并把累计电导率寄存器、原有电导率寄存器和累计储存时间寄存器清零；步骤2为延时子程序，用于设置采样的间隔时间Td，本实施例设置Td＝30s，本实施例温度适用范围为4～34℃，对应鲜奶的电导率变化范围3.02～6.02×103μs/cm，选用内置9位AD转换器的单片机，设置测量精度为最小分辨率3.00/512×103μs/cm≈0.006×103μs/cm，从下述的鲜奶储存温度与保鲜期关系的试验数据和冷却试验数据：
Figure PCTCN2017108315-appb-000001
可知，奶温达到34℃时，奶质变化的引起电导率变化速度是每小时0.3×103μs/cm，即每分钟变化0.005×103μs/cm，小于9位AD转换器的最小分辨率，因此，只要采样周期Td≤1min就可以保证奶质变化引起的电导率变化足够小，以至于不能采集到。同时，还可以看出，温度变化最慢速度约0.17℃/min，即温度引起的电导率变化的最慢速度为每分钟0.017×103μs/cm，因此只要采样周期Td≥0.29min就可以保证温度变化引起的电导率变化被采集到。因此，本实施例延时时间即采样周期Td的取值范围为0.5min-1min，即20s-60s。步骤3用于端口电压U的检测采样；步骤4用于根据采样电压得到对应的鲜奶电导率σt；步骤5用于由原累计电导率与电导率的增量σt-σ0，得到当前累计电导率∑σ；步骤6用于更新存放原有电导率σ0的寄存器：步骤7用于根据当前累计电导率∑σ查表得到对应温度下的保鲜期Tp；步骤8用于由原有累计储存时间与本次归算到标准储存温度下的延时时间获得当前累计储存时间，其中，所述的Tb和∑T分别为标准储存温度下保鲜期时间长度和累计储存时间；步骤9用于判断上述的累计储存时间是否超出保鲜期，是则跳出循环，否则再次执行步骤2-9；步骤10用于输出“0”以显示超过保鲜期；与现有技术相比，本实施例可以排除奶质变化引起的电导率变化对于根据电导率判断奶温及其对应的保鲜期所造成的干扰 和误差，能够更准确反映温度对鲜奶保鲜期的影响，能够使消费者准确地了解鲜奶的新鲜程度。
实施例2
参见图2，本实施例与实施例1的区别主要在于：由检测采样电压U与鲜奶电导率σ关系和TAB(∑σ，Tp)制作数据表TAB(∑U，Tp)，直接以检测采样得到的输入端口电压即U为控制变量，好处是简化程序。
需要指出的是，凡是利用本发明说明书及附图内容所做的等效变换，或相同实质含义的不同表述，以及直接或间接运用在其他相关的技术领域，均在本发明的专利保护范围内。

Claims (1)

  1. 一种鲜奶保鲜期判断方法，不断把当前温度下的储存时间归算到标准温度下的储存时间并进行累计，通过比对累计标准温度下的储存时间与标准温度下的保鲜期，判断是否在保鲜期内，其特征在于：适当设置采样检测周期和采样检测分辨率，使得在该周期内可以检测到奶温变化导致的电导率或相关参变量的变化，而奶质变化导致的电导率或相关参变量的变化可以被忽略；所述的当前温度为鲜奶的初始电导率与累计电导率增量之和对应的鲜奶温度，所述的电导率增量是在采样周期内可记录到的电导率变化量；所述的当前温度为鲜奶的初始电导率对应的相关参变量与该相关参变量累计增量之和对应的鲜奶温度，所述的该相关参变量增量是在采样周期内可记录到的该相关参变量变化量。
PCT/CN2017/108315 2017-05-05 2017-10-30 一种鲜奶保鲜期的判断方法 WO2018201680A1 (zh)

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