CN108693216A - A kind of soil moisture content measurement method - Google Patents
A kind of soil moisture content measurement method Download PDFInfo
- Publication number
- CN108693216A CN108693216A CN201810361483.6A CN201810361483A CN108693216A CN 108693216 A CN108693216 A CN 108693216A CN 201810361483 A CN201810361483 A CN 201810361483A CN 108693216 A CN108693216 A CN 108693216A
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- China
- Prior art keywords
- soil moisture
- moisture content
- electrode
- measurement method
- soil
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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
Abstract
The present invention relates to a kind of soil moisture content measurement methods, belong to soil moisture indirect on-line real-time measuremen method and technology field.This method utilizes Computer Control Technology, applies the exciting current of constant amplitude at electrode both ends.Electric current flows through tested soil, causes electrode both end voltage temporal variations.The relationship of voltage transient change procedure and soil moisture has monotonicity.By measuring the initial value of voltage transient change procedure, is handled through computer and obtain the sizes values for indicating soil moisture content humidity.This method is simple and practical, and measurement accuracy is higher.
Description
Technical field
The present invention relates to a kind of soil moisture content measurement methods, belong to the indirect on-line real-time measuremen method and technology neck of soil moisture
Domain.
Background technology
Soil moisture content refers to the dry and wet degree of soil suitable for plant growth and development, and soil moisture content is crop seed emergence, life
Long and yield composition one of essential condition.Information collection is carried out to soil moisture content and carries out Fast Monitoring, realizes agricultural in real time
Precision Irrigation all has significance to control damage caused by a drought and agricultural water-saving irrigation.Thus, soil moisture content detection method is one
Basic and key technology.Currently, soil moisture content on-line quick detection is all based on greatly electrode measurement mode to realize, due to
The structure and composition of practical soil is extremely complex, and the electric signal that electrode tip applies can cause the change of soil electrical characteristics, to hold
It is also easy to produce larger measurement error.
Invention content
The present invention proposes a kind of soil moisture content measurement method, using computer acquisition technology by controlling external signal
Time reduces influence of the external electric signal to soil characteristic, to reduce measurement error.This method is simple and practical, measurement accuracy
It is higher.
The present invention is to solve its technical problem to adopt the following technical scheme that:
A kind of soil moisture content measurement method, includes the following steps:
(1) apply the current excitation signal of constant amplitude at electrode both ends, it is defeated in the generation of electrode both ends that electric current flows through soil
Go out voltage V1;Since there is soil RC resistance-capacitance circuit characteristics, the voltage V1 temporal variations processes to charge with RC resistance-capacitance circuits
Transient characterisitics.
(2) output voltage V1 generation square-wave signals compared with sawtooth signal;
(3) initial value of the voltage V1 transient processes is obtained according to the width of square-wave signal.
(4) initial value of the voltage V1 transient processes has dull correspondence with electric resistance of soil size, and soil is electric
Resistance size represents soil moisture size.According to the initial value of the voltage V1, data processing unit is handled by data operation and is obtained
It must reflect the humidity value of soil moisture content;
(5) display unit shows the humidity value of soil moisture content.
The described step (1) is two, electrode, interpolar distance 50mm.
The electrode is wrapped up using insulation, and length is the stainless steel electrode of 200mm.
The eletrode tip exposed portion length 10mm.Tip diameter is 1mm.
Step (1) the current excitation signal is the current source signal of amplitude 1mA.
The frequency of step (2) described sawtooth signal is 80Hz.
Beneficial effects of the present invention are as follows:
(1) electrode of the present invention is wrapped up using insulation, and eletrode tip exposing is contacted with soil, is reduced electrode and is contacted with soil
Face reduces interference, improves measurement accuracy.
(2) present invention can compare according to the initial value to resistance-capacitance network both end voltage temporal variations process and accurately reflect soil
The actual value of earth humidity, improves measurement accuracy.
Description of the drawings
Fig. 1 is the principle of the present invention block diagram.
Specific implementation mode
The invention is described in further details below in conjunction with the accompanying drawings.
It is the principle of the present invention block diagram as shown in Figure 1, soil moisture content measurement method uses following device, including:
Two measuring electrodes and Mersure Controler.Mersure Controler includes mainly Impetus of Current Source unit, measuring unit, letter
Number generating unit, signal compares and output unit, data processing unit and display unit.
Two electrodes use stainless steel electrode, electrode to be wrapped up using insulation, and eletrode tip exposed portion length is on the left sides 10mm
The right side, tip diameter 1mm, length 200mm draw points, interpolar distance 50mm.It is interfered to reduce, two electrode excitation signals are one
The current source signal of constant amplitude, current source amplitude are 1mA.Impetus of Current Source is applied to the excitation electrode both ends, electric current stream
It crosses soil and generates voltage output V1 at electrode both ends.Voltage V1 gives Mersure Controler and passes through the production compared with the sawtooth signal of system
The frequency of raw square-wave signal, sawtooth signal is 80Hz.Soil capacitance-resistance characteristic transient state mistake can be obtained according to the width of square-wave signal
The initial value of Cheng Bianhua, the processing by data processing unit to square-wave signal obtain soil moisture sizes values.
The operation principle of the present invention is that:
Due to soil have RC resistance-capacitance network characteristics, when electrode both ends apply Impetus of Current Source when, be equivalent to through resistance to
Capacitor charging is stablized after a period of time, electrode both end voltage reaches.It is closed since soil moisture is corresponding with electric resistance of soil deposit receipt tune
System, when soil moisture is bigger, the resistance for representing soil moisture is smaller, then the initial value of output voltage is lower, while RC capacitance-resistance nets
Network circuit iterative procedures are also longer.Conversely, when soil moisture is smaller, the resistance for representing soil moisture is bigger, then output voltage
Initial value is higher, and RC resistance-capacitance network circuit iterative procedures are shorter.Thus, by acquiring the initial value of output voltage transient process,
The resistance value for representing soil moisture size is can be obtained, soil moisture value is obtained according to its resistance sizes.
Claims (6)
1. a kind of soil moisture content measurement method, which is characterized in that include the following steps:
(1) apply the current excitation signal of constant amplitude at electrode both ends, electric current flows through soil and generates output electricity at electrode both ends
Pressure;Because soil has capacitance-resistance characteristic, therefore the output voltage is changed by resistance-capacitance circuit transient process.
(2) output voltage generation square-wave signal compared with the sawtooth signal that signal generating unit generates;
(3) initial value of the voltage transient change in process is obtained according to the width of square-wave signal, passes through data processing unit
Calculation process obtains the humidity value of reflection soil moisture content;
(4) display unit shows the humidity value of soil moisture content.
2. a kind of soil moisture content measurement method according to claim 1, which is characterized in that the described step (1) is electrode two
Root, interpolar distance 50mm.
3. a kind of soil moisture content measurement method according to claim 2, which is characterized in that the electrode, which uses, has tip
Stainless pin, length 200mm, tip diameter 1mm.
4. a kind of soil moisture content measurement method according to claim 3, which is characterized in that the electrode uses insulating bag
It wraps up in, electrode tip exposed portion length is in 10mm.
5. a kind of soil moisture content measurement method according to claim 1, which is characterized in that step (1) described current excitation
Signal is the current source signal of amplitude 1mA.
6. a kind of soil moisture content measurement method according to claim 1, which is characterized in that step (2) the sawtooth wave letter
Number frequency be 80Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810361483.6A CN108693216A (en) | 2018-04-20 | 2018-04-20 | A kind of soil moisture content measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810361483.6A CN108693216A (en) | 2018-04-20 | 2018-04-20 | A kind of soil moisture content measurement method |
Publications (1)
| Publication Number | Publication Date |
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| CN108693216A true CN108693216A (en) | 2018-10-23 |
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ID=63845188
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| CN201810361483.6A Pending CN108693216A (en) | 2018-04-20 | 2018-04-20 | A kind of soil moisture content measurement method |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101281152A (en) * | 2008-06-03 | 2008-10-08 | 华南农业大学 | Soil moisture sensor |
| CN103048364A (en) * | 2012-11-28 | 2013-04-17 | 华南农业大学 | Soil moisture content measuring device and method based on frequency characteristic of RC (Remote Control) network |
| CN104198537A (en) * | 2014-09-03 | 2014-12-10 | 中国科学院合肥物质科学研究院 | Method and device for detecting moisture content and electric conductivity of soil |
| US20150330932A1 (en) * | 2014-05-19 | 2015-11-19 | Fiskars Oyj Abp | Soil moisture sensor |
| CN205484177U (en) * | 2016-03-02 | 2016-08-17 | 北京小米移动软件有限公司 | Soil parameters measuring device |
| CN107389737A (en) * | 2017-07-04 | 2017-11-24 | 北京林业大学 | A kind of soil parameters measurement apparatus |
| CN207067046U (en) * | 2017-08-28 | 2018-03-02 | 上海农芯科技有限公司 | Dedicated processes chip based on electrode method testing soil moisture |
| CN207067044U (en) * | 2017-08-28 | 2018-03-02 | 上海农芯科技有限公司 | Four sections of soil moisture detection sensors based on TDR modes |
-
2018
- 2018-04-20 CN CN201810361483.6A patent/CN108693216A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101281152A (en) * | 2008-06-03 | 2008-10-08 | 华南农业大学 | Soil moisture sensor |
| CN103048364A (en) * | 2012-11-28 | 2013-04-17 | 华南农业大学 | Soil moisture content measuring device and method based on frequency characteristic of RC (Remote Control) network |
| US20150330932A1 (en) * | 2014-05-19 | 2015-11-19 | Fiskars Oyj Abp | Soil moisture sensor |
| CN104198537A (en) * | 2014-09-03 | 2014-12-10 | 中国科学院合肥物质科学研究院 | Method and device for detecting moisture content and electric conductivity of soil |
| CN205484177U (en) * | 2016-03-02 | 2016-08-17 | 北京小米移动软件有限公司 | Soil parameters measuring device |
| CN107389737A (en) * | 2017-07-04 | 2017-11-24 | 北京林业大学 | A kind of soil parameters measurement apparatus |
| CN207067046U (en) * | 2017-08-28 | 2018-03-02 | 上海农芯科技有限公司 | Dedicated processes chip based on electrode method testing soil moisture |
| CN207067044U (en) * | 2017-08-28 | 2018-03-02 | 上海农芯科技有限公司 | Four sections of soil moisture detection sensors based on TDR modes |
Non-Patent Citations (1)
| Title |
|---|
| 胡兴艺 等: "RC阻容模型在土壤墒情动态分析中的应用", 《土壤与作物》 * |
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Application publication date: 20181023 |