Method for assessing measurement uncertainty of water content in cigarettes

A technology for measuring uncertainty and moisture content, applied to measuring devices, by removing certain component weighing, instruments, etc., can solve the problems of incomplete evaluation results, ineffective reference, waste, etc., and improve the efficiency of evaluation work , Reduce the difficulty of evaluation and ensure the effect of accuracy

Active Publication Date: 2017-05-17
YUNNAN TOBACCO QUALITY SUPERVISION MONITORING STATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the detection of moisture content in cigarettes m 1 、m 2 They are all weighed with the same balance, and considering the correlation of the two parameters will inevitably involve the calculation of covariance, which is another difficulty for most laboratories, so many laboratories will use it when evaluating the measurement uncertainty. Use "assume no correlation" to ign

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  • Method for assessing measurement uncertainty of water content in cigarettes
  • Method for assessing measurement uncertainty of water content in cigarettes
  • Method for assessing measurement uncertainty of water content in cigarettes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 1. Detection steps of cigarette moisture content

[0054] According to the determination procedure of GB / T 22838.8-2009, the moisture content of cigarettes is as follows: the temperature in the oven is stabilized at (100±2)°C; the sample box is opened and placed in the middle layer of the oven for 30 minutes of air blast drying, and the cover is taken out and the sample box is placed in the Desiccator, weigh after cooling to room temperature, accurate to 0.001g; take out about 5g of shredded cigarette tobacco, put it into a weighed sample box, and weigh it; open the cover of the sample box, put it in the middle layer of the oven to dry it with air, wait for the temperature to rise and Start timing when it is kept at (100±2)°C; count for 2 hours, cover the sample box and put it in a drying oven, cool to room temperature and weigh; the moisture content measurement result is accurate to 0.01%.

[0055] 2 Analysis of Influencing Factors

[0056] According to GB / T 22838.8-2...

Embodiment 2

[0194] On the basis of Example 1, further, the expanded uncertainty of the detection of the moisture content of the cigarette sample can be obtained according to the following formula:

[0195] u 95 (W)=2u c (W)...(34)

[0196] In the formula: u c (W) is the combined standard uncertainty of the moisture content of the cigarette samples. u 95 (W) is the expanded uncertainty of the moisture content of the cigarette sample with a inclusion probability of 95%. 95 (W), W+U 95 (W)] interval. Therefore, the half-width of the fluctuation range of the cigarette sample detection data is related to U 95 (W) The closer the calculation range is, the more comprehensive the factors considered in the uncertainty assessment are.

Embodiment 3

[0198] Investigate the consistency between the detection deviation value of the moisture content of cigarettes in 10 laboratories and the calculated value of the model of the present invention.

[0199] Specifically follow the steps below:

[0200] 1. Check the laboratory temperature and humidity record table, and get the maximum temperature as T max =30°C, maximum humidity

[0201] Value H max =70%, minimum humidity H min = 40%. Substitute the maximum temperature T=30℃ into formula (1)

[0202] K T =0.0017╳ln(T)-0.0025=0.00328...(1)

[0203] The slope K calculated by the above formula T =0.00328, and the maximum value of humidity found H max =70%, minimum humidity H min = 40%, substituting into formula (2), get laboratory temperature and humidity changes on the quality of cut tobacco before drying δM 环 :

[0204] δM 环 = K T (H max -H min ) = 0.0984...(2)

[0205] 2. Check the laboratory oven calibration certificate to get the temperature fluctuation range of t...

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Abstract

The invention discloses a method for assessing measurement uncertainty of water content in cigarettes. An equation is established according to the relation between temperatures and humidity of different environments and the quality of cut tobacco before curing, and the variation quantity of cut tobacco before curing is calculated; an equation is established according to the relation between oven temperatures and the quality of cured cut tobacco, and the variation quantity of the cured cut tobacco is calculated; the measured water content and the standard deviation of the cured cut tobacco are taken as independent variables and substituted into an uncertainty model, and an uncertainty calculation value of the water content in a laboratory is obtained. The sensitive coefficient is calculated by use of partial derivatives and the correlation quantity is calculated by the aid of covariance. By use of the model, temperatures and humidity of different environments, water content of different samples and water content uncertainties under different oven temperature fluctuations can be calculated in different laboratories; the method has the characteristics of being low in cost, high in efficiency, simple and convenient to implement, high in practicability and the like, and uncertainty results of water content of cigarettes can be rapidly and accurately obtained. The method is applicable to assessment of other water content uncertainties similar to those of the measurement model and can overcome existing uncertainty assessment defects.

Description

technical field [0001] The invention belongs to the technical field of uncertainty evaluation, and in particular relates to a method for evaluating the measurement uncertainty of the moisture content of cigarettes. Background technique [0002] Laboratory accreditation is equivalent to the mutual recognition agreement signed by laboratory accreditation agencies between countries, so as to reduce repeated inspections, eliminate technical barriers to trade, and promote international trade. [0003] ISO-IEC17025:2005 "Accreditation Criteria for Testing and Calibration Laboratories" is an international standard for laboratory accreditation and a standard for China National Accreditation Service for Conformity Assessment to evaluate whether a laboratory can pass laboratory accreditation. This standard requires laboratories to evaluate the measurement uncertainty of the parameters tested, and laboratories that do not have this capability will be issued non-conformity items and ris...

Claims

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Application Information

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IPC IPC(8): G01N5/04
CPCG01N5/045
Inventor 李海燕李郸马慧宇蔡洁云李雪梅陈新瑞肖燕王惠平
Owner YUNNAN TOBACCO QUALITY SUPERVISION MONITORING STATION
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