CN108459058A - A kind of measuring device of the capacitance sensor for detecting plant leaf blade water content and its sensor composition - Google Patents
A kind of measuring device of the capacitance sensor for detecting plant leaf blade water content and its sensor composition Download PDFInfo
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- CN108459058A CN108459058A CN201810235518.1A CN201810235518A CN108459058A CN 108459058 A CN108459058 A CN 108459058A CN 201810235518 A CN201810235518 A CN 201810235518A CN 108459058 A CN108459058 A CN 108459058A
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- leaf blade
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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
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
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Abstract
The present invention discloses a kind of capacitance sensor of detection plant leaf blade water content, the sensor includes that lightweight measures folder, two substrates and two parallel-plate electrodes, it includes upper clamp and lower clamp that the lightweight, which measures folder, and two substrates are fixed on the lightweight and measure on the upper clamp and lower clamp of folder, two parallel-plate electrodes are separately fixed on two substrates, the substrate is insulator thin plate, and the parallel-plate electrode is conducting foam.The chucking power of plastic clip can be transmitted on blade by the parallel-plate electrode in the capacitance sensor of the present invention well so that blade is bonded with parallel-plate electrode, and is not easy damaged blade；The measuring device of the present invention is composed in parallel by multiple capacitance sensors, can be reduced the area of single sensor clamping, be avoided clipping to vein, reduce the error of measurement, provide leaf water content measurement accuracy.
Description
Technical field
The invention belongs to the measuring device fields of plant leaf blade water content, and in particular to a kind of detection plant leaf blade water content
Capacitance sensor and its sensor composition measuring device.
Background technology
Plant moisture, which wanes, can lead to the disorder of physiological activity, therefore to plant quickly, accurately have with Nondestructive
Significance.Plant leaf blade is the vitals for carrying out the physiology courses such as photosynthesis, respiration and transpiration, blade
Water content can truly reflect the moisture and damage caused by a drought information of plant, realize quick, the accurate and nothing of plant leaf blade water content
Damage detection is for research plant physiology and drought resisting is instructed to be of great significance.
Plant leaf blade water content detection process includes mainly two major classes at present：It directly measures and measures indirectly.Directly measure
I.e. traditional dry method measurement, test period is long, and can damage plant leaf blade, is not suitable for somatometry.Measure indirectly includes figure
As facture, microwave method and dielectric method etc..Image treating, which measures, to be easy to be influenced by intensity of illumination, and microwave method is because measuring frequency
Rate is higher, and result is easily interfered by high frequency characteristics, and in comparison dielectric method is with simple in structure, measurement is accurate and at low cost
Honest and clean feature is conducive to promote and apply in agricultural production.It is to utilize based on plant leaf blade dielectric property detection leaf water content
Plant leaf blade is as dielectric, according to the difference of the plant leaf blade capacitance of different moisture content, by the variation for measuring capacitance
Obtain the water content of blade.When measurement, be placed in measured leaf as dielectric in capacitance sensor, by measure with
The capacitance of the linear capacitance sensor of corresponding relationship of its dielectric parameter obtains the water content of plant leaf blade indirectly.Based on Jie
Electrical characteristics detection plant leaf blade water content has the characteristics that easy to operate and fast and easy.But the capacitance of plant leaf blade is removed
Outside being influenced by plant leaf blade water content, electrode plate also significantly affects the pressure of plant leaf blade the capacitance of measurement, identical
Electrode plate measurement range internal cause vein thickness difference can also reduce accuracy of detection under pressure.But existing instrument does not account for blade
Influence of the vein thickness to testing result so that accuracy of detection is not high.Such as use copper sheet as parallel-plate electrode, because of the rigidity of copper sheet
Pressure effectively cannot all be passed to electrode plate by vein blocking and cover all areas, pressure by property, pressure hour copper sheet
Cause vein injured when big, will either way influence measurement accuracy.
Invention content
In view of the deficiencies of the prior art, the present invention proposes a kind of capacitance sensor of detection plant leaf blade water content and by this
The measuring device of sensor composition, specific technical solution are as follows：
A kind of capacitance sensor of detection plant leaf blade water content, which is characterized in that the sensor includes that lightweight is surveyed
Amount folder, two substrates and two parallel-plate electrodes, it includes upper clamp and lower clamp that the lightweight, which measures folder, and two substrates are solid
It is scheduled on the lightweight to measure on the upper clamp and lower clamp of folder, described two parallel-plate electrodes are separately fixed at two substrates
On, the substrate is insulator thin plate, and the parallel-plate electrode is conducting foam.
Preferably, the conducting foam wraps up fire-retardant PU foams by conductive fibre fabric and is made.
Preferably, the conductive fibre fabric is plated with nickel or copper or gold or carbon on polyester fiber, makes to have good
Surface conductivity.
Preferably, it is plastic clip that the lightweight, which measures folder,.
Preferably, the fire-retardant PU foams thickness is 1mm~5mm.
A kind of device of detection plant leaf blade water content, which is characterized in that the device includes capacitance measuring instrument and several
The capacitance sensor composition, several described sensor parallels are connected on capacitance measuring instrument.
Beneficial effects of the present invention：Parallel-plate electrode in the capacitance sensor of the present invention is made of conducting foam, can
The chucking power of plastic clip is transmitted on blade well so that blade is bonded with parallel-plate electrode, and is not easy damaged blade；
The measuring device of the present invention is composed in parallel by multiple capacitance sensors, can be reduced the area of single sensor clamping, be avoided pressing from both sides
To vein, reduce the error of measurement, leaf water content measurement accuracy is provided.
Description of the drawings
Fig. 1 is the structural schematic diagram of the capacitance sensor of the present invention；
In figure, 1- plastic clips, 2- substrates, 3- parallel-plate electrodes, 4- blades.
Specific implementation mode
Below according to attached drawing and the preferred embodiment detailed description present invention, the objects and effects of the present invention will become brighter
In vain, below in conjunction with drawings and examples, the present invention will be described in further detail.It should be appreciated that described herein specific
Embodiment is only used to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, a kind of capacitance sensor of detection plant leaf blade water content comprising 1, two substrate 2 of plastic clip
With two parallel-plate electrodes 3, plastic clip 1 includes upper clamp and lower clamp, and two substrates 2 are separately fixed at the upper folder of plastic clip
On body and lower clamp, two parallel-plate electrodes 3 are separately fixed on two substrates 2, and substrate 2 is insulator thin plate, parallel-plate electricity
Pole 3 is conducting foam.
Preferably, conducting foam wraps up fire-retardant PU foams by conductive fibre fabric and is made；
Preferably, conductive fibre fabric is plated with nickel or copper or gold or carbon on polyester fiber, makes that there is good surface to lead
Electrically.
Preferably, fire-retardant PU foams thickness is 1mm~5mm.
A kind of device of detection plant leaf blade water content, the device include that capacitance measuring instrument and several above-mentioned capacitances pass
Sensor forms, several sensor parallels are connected on capacitance measuring instrument, and the both ends of conducting foam 3 are wired to capacitance
On measuring instrument.When measurement, several multiple sensors are clipped in blade opposite side respectively and are measured.
The device high certainty of measurement of the detection plant leaf blade water content of the present invention, in the measurement of glossy privet blade, water content
Find that significance is less than 0.01 (P with capacitance, vane thickness regression analysis<0.01), the related coefficient adjustment side R is
0.986, water content prediction residual is 1.6% to -1.7%, in the measurement of sweet viburnum blade, water content and capacitance, blade
Thickness is less than 0.01 (P through regression analysis, significance<0.01), the related coefficient adjustment side R is 0.945, and water content prediction is residual
Difference is 2.4% to -2.2%.
It will appreciated by the skilled person that the foregoing is merely the preferred embodiment of invention, it is not used to limit
System invention, although invention is described in detail with reference to previous examples, for those skilled in the art, still
It can modify to the technical solution of aforementioned each case history or equivalent replacement of some of the technical features.It is all
Within the spirit and principle of invention, modification, equivalent replacement for being made etc. should be included within the protection domain of invention.
Claims (6)
1. a kind of capacitance sensor of detection plant leaf blade water content, which is characterized in that the sensor includes that lightweight measures
Press from both sides (1), two substrates (2) and two parallel-plate electrodes (3), it includes upper clamp and lower clamp that the lightweight, which measures and presss from both sides (1), and
Two substrates (2) are fixed on the lightweight and measure on the upper clamp and lower clamp of folder (1), described two parallel-plate electrodes
(3) it is separately fixed on two substrates (2), the substrate (2) is insulator thin plate, and the parallel-plate electrode (3) is to lead
Electric foam.
2. the capacitance sensor of detection water content according to claim 1, which is characterized in that the conducting foam is by leading
Electric fiber cloth is wrapped up fire-retardant PU foams and is made.
3. the capacitance sensor of detection plant leaf blade water content according to claim 1, which is characterized in that the conduction
Fiber cloth is plated with nickel or copper or gold or carbon on polyester fiber, makes have good surface conductivity.
4. the capacitance sensor of detection plant leaf blade water content according to claim 1, which is characterized in that the lightweight
It is plastic clip to measure folder (1).
5. the capacitance sensor of detection plant leaf blade water content according to claim 1, which is characterized in that described is fire-retardant
PU foam thickness is 1mm~5mm.
6. it is a kind of detection plant leaf blade water content device, which is characterized in that the device include capacitance measuring instrument and several such as
Capacitance sensor composition described in any one of claim 1-5, several described sensor parallels are connected to capacitance measurement
On instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810235518.1A CN108459058A (en) | 2018-03-21 | 2018-03-21 | A kind of measuring device of the capacitance sensor for detecting plant leaf blade water content and its sensor composition |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810235518.1A CN108459058A (en) | 2018-03-21 | 2018-03-21 | A kind of measuring device of the capacitance sensor for detecting plant leaf blade water content and its sensor composition |
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| CN108459058A true CN108459058A (en) | 2018-08-28 |
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| CN201810235518.1A Pending CN108459058A (en) | 2018-03-21 | 2018-03-21 | A kind of measuring device of the capacitance sensor for detecting plant leaf blade water content and its sensor composition |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110057876A (en) * | 2019-05-07 | 2019-07-26 | 济南大学 | A kind of method of capacitance type sensor measurement moisture content |
| CN110243884A (en) * | 2019-07-08 | 2019-09-17 | 中国农业大学 | Moisture and diameter synchronous measuring apparatus and method |
| CN112305313A (en) * | 2020-10-29 | 2021-02-02 | 北京林业大学 | Plant leaf impedance spectrum measuring device and method based on AD5933 chip |
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| CN103645355A (en) * | 2013-12-30 | 2014-03-19 | 江苏大学 | Sensor for measuring electrical parameters of plant leaves |
| CN203849198U (en) * | 2014-02-24 | 2014-09-24 | 西北农林科技大学 | Detection device for moisture content of plant leaves |
| CN104820136A (en) * | 2015-04-17 | 2015-08-05 | 江苏大学 | Device and method for rapidly measuring dielectric constant of crop leaf |
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| DE102006026557A1 (en) * | 2006-06-08 | 2007-12-27 | GRUNEWALD, Jörg | Plants volumetric water content determining device particularly sensor, has oscillator and two electrodes inserted into material, where oscillator is coupled with electrodes by electrical network |
| CN103645355A (en) * | 2013-12-30 | 2014-03-19 | 江苏大学 | Sensor for measuring electrical parameters of plant leaves |
| CN203849198U (en) * | 2014-02-24 | 2014-09-24 | 西北农林科技大学 | Detection device for moisture content of plant leaves |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110057876A (en) * | 2019-05-07 | 2019-07-26 | 济南大学 | A kind of method of capacitance type sensor measurement moisture content |
| CN110243884A (en) * | 2019-07-08 | 2019-09-17 | 中国农业大学 | Moisture and diameter synchronous measuring apparatus and method |
| CN112305313A (en) * | 2020-10-29 | 2021-02-02 | 北京林业大学 | Plant leaf impedance spectrum measuring device and method based on AD5933 chip |
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Application publication date: 20180828 |