CN110082395A - A kind of fresh tobacco leaves moisture detecting method based on combined resistance - Google Patents
A kind of fresh tobacco leaves moisture detecting method based on combined resistance Download PDFInfo
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- CN110082395A CN110082395A CN201910351774.1A CN201910351774A CN110082395A CN 110082395 A CN110082395 A CN 110082395A CN 201910351774 A CN201910351774 A CN 201910351774A CN 110082395 A CN110082395 A CN 110082395A
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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
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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
- G01N27/048—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
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Abstract
The fresh tobacco leaves moisture detecting method based on combined resistance that the present invention relates to a kind of, combined resistance include fresh tobacco leaves upper surface resistance per unit lengthR On , lower surface resistance per unit lengthR Under And resistance per unit length between blade upper and lower surfaceR Between , the relationship between fresh tobacco leaves moisture and combined resistance is shown below:W Moisture contains rate =4.56×R On ×10 ‑9 +3.78×R Under ×10 ‑9 +14.83×R Between ×10 ‑9 .Testing result of the present invention is accurate, it is easy to operate, required time is short, it is only necessary to a few minutes can be obtained by the moisture content numerical value of fresh tobacco leaves, no longer need to by subsequent complicated analysis, the moisture content exact value that fresh tobacco leaves can be obtained, can be used for the judgement of fresh tobacco leaves quality and maturity.
Description
Technical field
The present invention relates to a kind of fresh tobacco leaves moisture detecting methods, and in particular to a kind of fresh tobacco leaves based on combined resistance
Moisture detecting method.
Background technique
Moisture content in leaves is an important indicator, not only affects mechanics, the thermal property of tobacco leaf, has an effect on the object of tobacco leaf
Manage characteristic and processing quality.For fresh tobacco leaves moisture content in different plants and its growth cycle, maturity, upgrowth situation
And tobacco variety has important index parameter.Moisture of the moisture in air and soil in fresh tobacco leaf.Tobacco leaf
Interior aqueous percentage, that is, moisture content in leaves, is called tobacco leaf moisture content, tobacco leaf moisture percentage or tobacco leaf water content, is tobacco and its system
One of important component of product.Fresh tobacco leaves moisture content is studied, is had to tobacco growing situation and rule, germplasm information etc. is understood
Important meaning.
Currently, the detection for moisture content in leaves mainly uses Oven Method, electric-resistivity method etc., and it is mainly used for cured tobacco leaf
Moisture measurement.Oven Method be measure that tobacco moisture result is more accurate and reliable and International Trade in the side approved mutually
Method, what detection moisture content in leaves used in the existing flue-cured tobacco national standard in China is also this method, and cardinal principle is by known wet basis quality
Tobacco is put into drying in oven, then measure drying after butt quality, finally by be calculated cigarette sample absolute drift and
Relative moisture content.
However, the above method cannot directly detect and detection process has damage fresh tobacco leaves and tobacco plant.Meanwhile
Electric-resistivity method has the advantages that intuitive, quick, easy to use, is currently used primarily in the measurement of cured tobacco leaf moisture, the range of measurement
Mainly 10-30%, fresh tobacco leaves moisture content 60-80%, this method are not particularly suited for the detection of fresh tobacco leaves, simultaneously because
It, which is measured, only simply measures the resistance value of entire blade, do not account for tobacco leaf upper surface wax, lower surface villus secretion with
And blade upper and lower surface interlayer is to resistance value influences, therefore resultant error of its measurement is larger.
Summary of the invention
In order to solve the above technical problem, the present invention provides a kind of fresh tobacco leaves water content detection side based on combined resistance
Method.The object of the invention is achieved by following technical proposal:
A kind of fresh tobacco leaves moisture detecting method based on combined resistance, combined resistance include fresh tobacco leaves upper surface unit
Length resistance ROn, lower surface resistance per unit length RUnderAnd resistance per unit length R between blade upper and lower surfaceBetween, fresh tobacco leaves moisture
Relationship between combined resistance is shown below:
WMoisture contains rate=4.56 × ROn×10-9+3.78×RUnder×10-9+14.83×RBetween×10-9。
A kind of fresh tobacco leaves moisture detecting method based on combined resistance, includes the following steps:
The detection of step (1), fresh tobacco leaves resistance per unit length
To fresh tobacco leaves upper surface resistance per unit length ROn, lower surface resistance per unit length RUnderAnd between blade upper and lower surface
Resistance per unit length RBetweenIt measures；When detection, ambient humidity is not more than 40%, and temperature is 18-30 DEG C；
The calculating of step (2), fresh tobacco leaves moisture content
The resistance per unit length numerical value that will be measured substitutes into following formula:
WMoisture contains rate=4.56 × ROn×10-9+3.78×RUnder×10-9+14.83×RBetween×10-9, fresh tobacco leaves water can be obtained
Divide mass percentage.
Further, in step (1), the detection specifically chooses tobacco leaf blade tip respectively, in leaf and the inspection of phyllopodium three parts
The resistance per unit length between upper surface, lower surface and upper and lower surface is surveyed, every part detection number is no less than 3 times, and to all surveys
Amount data are averaged.
Further, in step (1), the detection is specifically to use multimeter detection upper surface, lower surface and upper following table
Resistance between the point of two, face, resistance per unit length value measure the ratio of resistance and its distance between two test points.
Further, in step (1), test point avoids leaf vein, and the line between test point does not span across leaf vein.
Compared with prior art, beneficial effects of the present invention are as follows:
(1) when present invention detection, without carrying out any processing to tobacco leaf, In vivo detection, detection process can directly be carried out
Tobacco plant and tobacco leaf are not damaged.
(2) testing result of the present invention is accurate, easy to operate, required time is short, it is only necessary to which a few minutes can be obtained by fresh
The moisture content numerical value of tobacco leaf no longer needs to that the moisture content exact value of fresh tobacco leaves can be obtained by subsequent complicated analysis
Time of measuring foreshortens to 5min by the 120min of standard method Oven Method, and efficiency increases 24 times.Measurement result and conventional method
It matches, error can be used for the judgement of fresh tobacco leaves quality and maturity less than 10%.
Specific embodiment
Below with reference to embodiment, the present invention is described in further detail, but is not limited in any way the present invention
System, based on present invention teach that any transformation or improvement done, each fall within protection scope of the present invention.Tool is not specified in embodiment
Body technique or condition person described technology or conditions or carry out according to the literature in the art according to product description.Institute
Production firm person is not specified with material or equipment, is the conventional products that can be obtained by purchase.
Embodiment 1
The fresh tobacco leaves moisture detecting method based on combined resistance of the present embodiment, includes the following steps:
Step (1), data acquisition
20 plants of different cultivars, planting conditions and the living body in growth period tobacco plant are randomly selected, silt, the water on surface are removed
Divide equal impurity.
Using digital electric bridge precision resister table, to fresh tobacco leaves upper surface resistance per unit length ROn, lower surface unit it is long
Spend resistance RUnderAnd resistance per unit length R between blade upper and lower surfaceBetweenIt measures；Tobacco leaf blade tip, Ye Zhong are specifically chosen respectively
Resistance per unit length between phyllopodium three parts detection upper surface, lower surface and upper and lower surface, is read, often after stablizing 10s
A position pendulous frequency is no less than 3 times, takes its average value.Ambient humidity is no more than 40%, 18-30 DEG C of temperature range when detection.
Upper surface resistance per unit length ROn, lower surface resistance per unit length RUnderAnd unit length electricity between blade upper and lower surface
Hinder RBetweenIt is the ratio that resistance and its distance are measured between two test point of upper surface, lower surface and upper and lower surface.Test point avoids leaf master
Arteries and veins, and the line between test point does not span across leaf vein.Testing result is as shown in table 1.
Step (2), standard method measurement
For above-mentioned tobacco leaf, surveyed using professional standard " YC/T31-1996 tobacco and tobacco product determination of moisture Oven Method "
Its fixed moisture content.
Step (3), model foundation and calculating
By in step (1), (2) the data obtained abnormal data and outlier identified and rejected, final choice 268
Sample data imports SPSS software and is established electrical characteristics using least square method multiple linear regression and quickly detected linear regression mould
Type: WMoisture contains rate=4.56 × ROn×10-9+3.78×RUnder×10-9+14.83×RBetween×10-9, coefficient of determination r2=0.921.I.e.
Fresh tobacco leaves biodiversity percentage composition can be obtained, as a result as shown in table 2.Resistance per unit length unit are as follows: ohm/cm.G
Ω=109Ω。WMoisture contains rateUnit: %.
The combined resistance testing result of 1 20 parts of fresh tobacco leaves samples of table
Meanwhile as a comparison, make according to professional standard " YC/T31-1996 tobacco and tobacco product determination of moisture Oven Method "
For the measured value of fresh tobacco leaves moisture, testing result is as shown in table 2.
In addition using existing electric-resistivity method, (" wind speed changes between Flue-cured moisture, electrical characteristics and leaf during dense drying
Research ") be measured, be shown below:
YResistance=1716.893-80.649XWater content+1.259XWater content 2-0.006XWater content 3, R2=0.714, wherein tobacco leaf is most wide
Locate the resistance value between both ends, the results are shown in Table 2.
2 20 parts of fresh tobacco leaves sample moisture predicted values of table are compared with measured value
Test result show method through this embodiment detection fresh tobacco leaves moisture predicted value and measured value difference compared with
Small, relative error is less than 10%.It is and larger by the result relative error that existing electric-resistivity method is detected, it is seen then that this hair
Bright method is better than existing electric-resistivity method prediction result, and the prediction result of prediction model is accurate.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of fresh tobacco leaves moisture detecting method based on combined resistance, it is characterised in that: combined resistance includes fresh tobacco leaves
Upper surface resistance per unit lengthR On , lower surface resistance per unit lengthR Under And resistance per unit length between blade upper and lower surfaceR Between , newly
Relationship between fresh tobacco leaf moisture and combined resistance is shown below:
W Moisture contains rate =4.56×R On ×10 -9 +3.78×R Under ×10 -9 +14.83×R Between ×10 -9 。
2. a kind of fresh tobacco leaves moisture detecting method based on combined resistance, characterized by the following steps:
The detection of step (1), fresh tobacco leaves resistance per unit length
To fresh tobacco leaves upper surface resistance per unit lengthR On , lower surface resistance per unit lengthR Under And unit between blade upper and lower surface
Length resistanceR Between It measures；When detection, ambient humidity is not more than 40%, and temperature is 18-30 DEG C；
The calculating of step (2), fresh tobacco leaves moisture content
The resistance per unit length numerical value that will be measured substitutes into following formula:
W Moisture contains rate =4.56×R On ×10 -9 +3.78×R Under ×10 -9 +14.83×R Between ×10 -9 , fresh tobacco leaves mass distributary can be obtained
Measure percentage composition.
3. the fresh tobacco leaves moisture detecting method according to claim 2 based on combined resistance, it is characterised in that: step
(1) in, the detection specifically chooses tobacco leaf blade tip respectively, in leaf and phyllopodium three parts detection upper surface, lower surface and up and down
Resistance per unit length between surface, every part detection number is no less than 3 times, and is averaged to all measurement data.
4. the fresh tobacco leaves moisture detecting method according to claim 2 based on combined resistance, it is characterised in that: step
(1) in, the detection is specifically to detect two upper surface, lower surface and upper and lower surface points using digital electric bridge precision resister table
Between resistance, resistance per unit length value measures the ratio of resistance and its distance between two test points.
5. the fresh tobacco leaves moisture detecting method according to claim 2 based on combined resistance, it is characterised in that: step
(1) in, test point avoids leaf vein, and the line between test point does not span across leaf vein.
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| CN201910351774.1A CN110082395B (en) | 2019-04-28 | 2019-04-28 | Fresh tobacco leaf moisture detection method based on composite resistor |
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| CN201910351774.1A CN110082395B (en) | 2019-04-28 | 2019-04-28 | Fresh tobacco leaf moisture detection method based on composite resistor |
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Citations (9)
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| 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 |
-
2019
- 2019-04-28 CN CN201910351774.1A patent/CN110082395B/en active Active
Patent Citations (9)
| 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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