CN110082395B - Fresh tobacco leaf moisture detection method based on composite resistor - Google Patents

Fresh tobacco leaf moisture detection method based on composite resistor Download PDF

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CN110082395B
CN110082395B CN201910351774.1A CN201910351774A CN110082395B CN 110082395 B CN110082395 B CN 110082395B CN 201910351774 A CN201910351774 A CN 201910351774A CN 110082395 B CN110082395 B CN 110082395B
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resistance
unit length
fresh tobacco
detection
moisture
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CN110082395A (en
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张承明
王晋
许�永
陈建华
李晶
黄海涛
张涛
蒋次清
刘欣
王茹
雷萍
杨光宇
李雪梅
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China Tobacco Yunnan Industrial Co Ltd
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China Tobacco Yunnan Industrial Co Ltd
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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
    • G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
    • 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
    • G01N27/048—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance for determining moisture content of the material

Abstract

The invention relates to a baseFresh tobacco leaf moisture detection method based on composite resistor, wherein the composite resistor comprises fresh tobacco leaf upper surface unit length resistorR On the upper part Lower surface resistance per unit lengthR Lower part And resistance per unit length between upper and lower surfaces of the bladeR Workshop The relationship between the fresh tobacco leaf moisture and the composite resistance is shown as the following formula:W water content ratio =4.56×R On the upper part ×10 ‑9 +3.78×R Lower part ×10 ‑9 +14.83×R Workshop ×10 ‑9 . The method has the advantages of accurate detection result, simple operation and short required time, can obtain the moisture content numerical value of the fresh tobacco leaves only in a few minutes, can obtain the accurate moisture content numerical value of the fresh tobacco leaves without subsequent complex analysis, and can be used for judging the quality and the maturity of the fresh tobacco leaves.

Description

Fresh tobacco leaf moisture detection method based on composite resistor
Technical Field
The invention relates to a fresh tobacco leaf moisture detection method, in particular to a fresh tobacco leaf moisture detection method based on a composite resistor.
Background
The moisture of the tobacco leaves is an important index, and not only influences the mechanical and thermal properties of the tobacco leaves, but also influences the physical characteristics and the process quality of the tobacco leaves. The method has important index parameters for the moisture content of fresh tobacco leaves on different plants, the growth period, the maturity, the growth condition and the tobacco leaf varieties. The water in fresh tobacco leaves is mainly derived from air and the water in the soil. The percentage of water in the tobacco leaves, namely the moisture content of the tobacco leaves, also called the moisture content of the tobacco leaves, the moisture content of the tobacco leaves or the moisture content of the tobacco leaves, is one of the important components of the tobacco and the products thereof. The research on the moisture content of fresh tobacco leaves has great significance for understanding the growth condition and rule of tobacco, germplasm information and the like.
At present, the moisture of the tobacco leaves is mainly detected by an oven method, a resistance method and the like, and the method is mainly used for measuring the moisture of the tobacco leaves after baking. The main principle of the method is that tobacco with known wet basis mass is put into an oven to be dried, then the dry basis mass after drying is measured, and finally the absolute moisture content and the relative moisture content of a tobacco sample are obtained through calculation.
However, the above methods cannot be directly detected and the detection process has damage to fresh tobacco leaves and tobacco plants. Meanwhile, the resistance method has the advantages of intuition, rapidness and convenient use, is mainly used for measuring the moisture of the flue-cured tobacco leaves at present, has the measuring range of mainly 10-30 percent and the moisture content of the fresh tobacco leaves of 60-80 percent, is not suitable for detecting the fresh tobacco leaves, and has larger error of the measuring result because the measuring method only simply measures the resistance value of the whole leaf and does not consider the influences of the wax on the upper surface of the tobacco leaves, the villus secretion on the lower surface of the tobacco leaves and the interlayer between the upper surface and the lower surface of the leaf on the resistance value.
Disclosure of Invention
In order to solve the technical problem, the invention provides a fresh tobacco leaf moisture detection method based on a composite resistor. The purpose of the invention is realized by the following technical scheme:
fresh tobacco leaf moisture detection method based on composite resistor, wherein the composite resistor comprises a unit length resistor R on the upper surface of the fresh tobacco leafOn the upper partLower surface resistance per unit length RLower partAnd resistance per unit length R between upper and lower surfaces of the bladeWorkshopThe relationship between the fresh tobacco leaf moisture and the composite resistance is shown as the following formula:
Wwater content ratio＝4.56×ROn the upper part×10-9+3.78×RLower part×10-9+14.83×RBetween×10-9。
A fresh tobacco leaf moisture detection method based on a composite resistor comprises the following steps:
step (1), detecting the resistance per unit length of fresh tobacco leaves
For the unit length resistance R of the upper surface of the fresh tobacco leavesOn the upper partLower surface resistance per unit length RLower partAnd resistance per unit length R between upper and lower surfaces of the bladeWorkshopCarrying out measurement; during detection, the environmental humidity is not more than 40 percent, and the temperature is 18-30 ℃;
step (2), calculating the moisture content of the fresh tobacco leaves
Substituting the measured resistance value per unit length into the following formula:
Wwater content ratio＝4.56×ROn the upper part×10-9+3.78×RLower part×10-9+14.83×RWorkshop×10-9And obtaining the moisture mass percentage content of the fresh tobacco leaves.
Further, in the step (1), the detection specifically comprises the steps of respectively selecting three parts of the leaf tip, the leaf and the leaf base of the tobacco leaf to detect the resistance per unit length between the upper surface, the lower surface and the upper and lower surfaces, wherein the detection times of each part are not less than 3 times, and averaging all measured data.
Further, in the step (1), the detecting specifically includes detecting the resistance between two points on the upper surface, the lower surface and the upper and lower surfaces by using a universal meter, and the resistance value in unit length is a ratio of the measured resistance between the two detected points to the distance between the two detected points.
Further, in step (1), the detection points avoid the main veins of the leaves, and the connection lines between the detection points do not cross the main veins of the leaves.
Compared with the prior art, the invention has the following beneficial effects:
(1) when the method is used for detecting, the tobacco leaves do not need to be treated, the living body detection can be directly carried out, and the tobacco plants and the tobacco leaves are not damaged in the detection process.
(2) The method has the advantages of accurate detection result, simple operation and short required time, can obtain the moisture content numerical value of the fresh tobacco leaves only in a few minutes, does not need subsequent complex analysis, can obtain the accurate moisture content numerical value of the fresh tobacco leaves, and shortens the measurement time from 120min to 5min of a standard method oven method, thereby increasing the efficiency by 24 times. The measurement result is identical with the traditional method, the error is less than 10 percent, and the method can be used for judging the quality and the maturity of the fresh tobacco leaves.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to be limiting in any way, and any variations or modifications which are based on the teachings of the present invention are intended to fall within the scope of the present invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The materials or equipment used are not indicated by manufacturers, and all are conventional products available by purchase.
Example 1
The fresh tobacco leaf moisture detection method based on the composite resistor comprises the following steps:
step (1), data acquisition
Randomly selecting 20 living tobacco plants with different varieties, planting conditions and growth periods, and removing impurities such as silt, water and the like on the surface.
Adopting a digital bridge high-precision resistance meter to measure the unit length resistance R of the upper surface of the fresh tobacco leavesOn the upper partLower surface resistance per unit length RLower partAnd resistance per unit length R between upper and lower surfaces of the bladeWorkshopCarrying out measurement; specifically, the leaf tips, the leaves and the leaf bases of the tobacco leaves are respectively selected to detect the resistance per unit length between the upper surface, the lower surface and the upper and lower surfaces, reading is carried out after stabilization for 10s, the measurement frequency of each part is not less than 3 times, and the average value is taken. When in detection, the environmental humidity is not more than 40 percent, and the temperature range is 18-30 ℃.
Upper surface unit length resistance RUpper part ofLower surface resistance per unit length RLower partAnd resistance per unit length R between upper and lower surfaces of the bladeWorkshopIs the ratio of the measuring resistance of the upper surface, the lower surface and the upper and lower surfaces to the distance between the measuring resistance and the upper and lower surfaces. The detection points avoid the main veins of the leaves, and the connection lines between the detection points do not cross the main veins of the leaves. The results are shown in Table 1.
Step (2), Standard method measurement
For the tobacco leaves, the moisture content is measured by the industry standard YC/T31-1996 tobacco and tobacco product moisture measuring oven method.
Step (3), model building and calculation
Identifying and eliminating abnormal data and outliers in the data obtained in the steps (1) and (2), finally selecting 268 sample data, importing the sample data into SPSS software, and establishing a linear regression model for quickly detecting the electrical characteristics by adopting a least square method multiple linear regression: wWater content ratio＝4.56×ROn the upper part×10-9+3.78×RLower part×10-9+14.83×RWorkshop×10-9Which determines the coefficient r20.921. The moisture mass percentage content of the fresh tobacco leaves can be obtained, and the results are shown in table 2. The unit length resistance unit is: ohm/cm. G Ω 109Ω。WWater content ratioUnit: % of the total weight of the composition.
Composite resistance detection results of 120 fresh tobacco leaf samples in table
Figure GDA0002069786830000031
Figure GDA0002069786830000041
Figure GDA0002069786830000051
Meanwhile, for comparison, the measured value of the moisture of the fresh tobacco leaves is taken as the measured value of the moisture of the fresh tobacco leaves according to the industry standard YC/T31-1996 tobacco and tobacco product moisture determination oven method, and the detection results are shown in Table 2.
The measurement was carried out by the conventional resistance method (study on moisture, electrical characteristics and inter-leaf wind speed change of flue-cured tobacco leaves during intensive baking) as shown in the following formula:
Yresistance (RC)＝1716.893-80.649XWater content+1.259XWater content 2-0.006XWater content 3，R2The resistance across the widest part of the tobacco leaf was 0.714, and the results are shown in table 2.
Table 220 parts of fresh tobacco sample moisture predicted value and measured value are compared
Figure GDA0002069786830000052
The test result shows that the difference between the predicted value and the measured value of the moisture of the fresh tobacco leaves detected by the method of the embodiment is small, and the relative error is less than 10%. The result obtained by detecting according to the existing resistance method has larger relative error, so that the method is superior to the existing resistance method in predicting the result, and the predicting result of the predicting model is accurate.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (2)

1. A fresh tobacco leaf moisture detection method based on a composite resistor is characterized by comprising the following steps: the method comprises the following steps:
step (1), detecting the resistance per unit length of fresh tobacco leaves
To fresh tobacco leaf upper surface unit length resistanceR On the upper part Lower surface resistance per unit lengthR Lower part And resistance per unit length between upper and lower surfaces of the bladeR Workshop Carrying out measurement; during detection, the environment humidity is not more than 40%, and the temperature is 18-30 ℃; the detection specifically comprises the steps of respectively selecting three parts of a leaf tip, a leaf and a leaf base of the tobacco leaf to detect the resistance of unit length between the upper surface, the lower surface and the upper and lower surfaces, wherein the detection times of each part are not less than 3 times, and averaging all measured data;
the detection specifically comprises the steps that a digital bridge high-precision ohmmeter is adopted to detect the resistance between two points on the upper surface, the lower surface and the upper and lower surfaces, and the resistance value of the unit length is the ratio of the measured resistance between the two detection points to the distance between the two detection points;
the detection points avoid the main veins of the leaves, and the connecting line between the detection points does not cross the main veins of the leaves;
step (2), calculating the moisture content of the fresh tobacco leaves
Substituting the measured resistance value per unit length into the following formula:
W water content ratio =4.56×R On the upper part ×10 -9 +3.78×R Lower part ×10 -9 +14.83×R Workshop ×10 -9 And obtaining the moisture mass percentage content of the fresh tobacco leaves.
2. The fresh tobacco moisture detection method based on the composite resistor according to claim 1, characterized by comprising the following steps: in the step (1), a digital bridge high-precision ohmmeter is adopted to detect the resistance between two points of the upper surface, the lower surface and the upper surface and the lower surface.
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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2587771A (en) * 1950-04-20 1952-03-04 American Tobacco Co Apparatus for determining moisture content of tobacco
CN203101316U (en) * 2013-01-18 2013-07-31 济南数能电子有限公司 Tobacco rib moisture detecting device of tobacco leaves
CN103271739A (en) * 2013-05-06 2013-09-04 清华大学 Method and device for skin moisture measurement
CN103439365A (en) * 2013-08-22 2013-12-11 浙江工商大学 Device and method for detecting water content of fresh tobacco leaves
CN106093143A (en) * 2016-08-26 2016-11-09 成都汉康信息产业有限公司 Resistance-type grain moisture meter
CN207380487U (en) * 2017-08-23 2018-05-18 红塔烟草(集团)有限责任公司 One kind is used to detect tobacco leaf multiple spot moisture content detection device
CN108572194A (en) * 2018-03-08 2018-09-25 江苏大学 A kind of assay method and device of plant leaf blade water guide degree and intrinsic water guide degree based on physiology resistance
CN108760838A (en) * 2018-04-25 2018-11-06 江苏大学 A kind of leaf water content prediction model and its method for building up based on dielectric property
CN108872317A (en) * 2018-07-03 2018-11-23 中国科学院地球化学研究所 A method of measurement plant leaf blade cell dielectric substance shifts number

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2587771A (en) * 1950-04-20 1952-03-04 American Tobacco Co Apparatus for determining moisture content of tobacco
CN203101316U (en) * 2013-01-18 2013-07-31 济南数能电子有限公司 Tobacco rib moisture detecting device of tobacco leaves
CN103271739A (en) * 2013-05-06 2013-09-04 清华大学 Method and device for skin moisture measurement
CN103439365A (en) * 2013-08-22 2013-12-11 浙江工商大学 Device and method for detecting water content of fresh tobacco leaves
CN106093143A (en) * 2016-08-26 2016-11-09 成都汉康信息产业有限公司 Resistance-type grain moisture meter
CN207380487U (en) * 2017-08-23 2018-05-18 红塔烟草(集团)有限责任公司 One kind is used to detect tobacco leaf multiple spot moisture content detection device
CN108572194A (en) * 2018-03-08 2018-09-25 江苏大学 A kind of assay method and device of plant leaf blade water guide degree and intrinsic water guide degree based on physiology resistance
CN108760838A (en) * 2018-04-25 2018-11-06 江苏大学 A kind of leaf water content prediction model and its method for building up based on dielectric property
CN108872317A (en) * 2018-07-03 2018-11-23 中国科学院地球化学研究所 A method of measurement plant leaf blade cell dielectric substance shifts number

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