CN102788823B - Frequency domain reflection-type soil humidity sensor - Google Patents
Frequency domain reflection-type soil humidity sensor Download PDFInfo
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- CN102788823B CN102788823B CN201110131573.4A CN201110131573A CN102788823B CN 102788823 B CN102788823 B CN 102788823B CN 201110131573 A CN201110131573 A CN 201110131573A CN 102788823 B CN102788823 B CN 102788823B
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Abstract
The invention provides a kind of soil humidity sensor based on frequency domain reflection principle, it can be implemented in the single-point single-depth in certain area coverage, the quick soil moisture measurement of the many degree of depth of multiple spot.Frequency domain reflection-type soil humidity sensor uses curtage output, can conveniently connect various test instrunment, and electric current output has the strongest capacity of resisting disturbance, beneficially long-distance transmissions.Frequency domain reflection-type soil humidity sensor application is convenient, only need to be inserted in the pvc pipe being embedded in detection place in advance, and the measurement time only needs short several seconds.The frequency domain reflection-type soil humidity sensor made according to Fig. 1 has following functions: frequency domain reflection-type soil humidity sensor is by measuring the DIELECTRIC CONSTANT ε of soil, it is possible to achieve the quick soil moisture measurement of the many degree of depth of the single-point single-depth in certain area coverage, multiple spot.
Description
Technical field
The present invention relates to a kind of soil humidity sensor, particularly relate to a kind of frequency domain reflection-type soil humidity sensor.
Background technology
Soil moisture content is the important physical parameter of soil, and the soil water is the tie of contact surface and ground water, at water
Playing an important role in the formation of resource, conversion and consumption process, soil water regime is for Rainfall-runoff, evapotranspiration and ecological ring
The changes of border underlying surface vegetation ecosystem etc. are significant.Meanwhile, soil moisture content is also in agricultural production conditions
One key index, the size of soil water content has vital effect to the growth of crops.Organic nutrient in soil
Decomposition mineralising be unable to do without moisture, the chemical fertilizer in being manured into soil only could dissolve in water, and nutrient ion is to root system table
Face migrates, and the absorption of nutrient all must be realized by crop root by moisture medium, the most effectively measuring and control
Soil water content is the basis of modern agricultural production.
Soil humidity sensor is mainly used to measure volumetric water content of soil, does soil moisture content monitoring and agricultural irrigation and woods
Industry is protected.At present the measuring method of soil moisture has a variety of, and one is directly to measure the weight moisture capacity of soil and volume is aqueous
Rate, such as oven drying method, Neutron probe method, the measurement conductive various methods of soil etc.；Another kind of is the matric potential by measuring soil
Realize, such as tensiometer method, resistance bolck method, psychrometer method etc..At present, the agrometeorological observation station of China is to soil moisture
The main method measured or traditional oven drying method, the part station also laid some automatic Observation instruments and measured, but
The instrument monitoring precision of various models is uneven, can't replace monitoring of manually fetching earth.
Since Trop et al. proposes to there is deterministic monodrome multinomial between soil moisture content and soil dielectric constant
Relation, just the measurement for soil moisture opens a new research direction, i.e. seeks soil by the dielectric constant of measurement soil
Earth moisture content.In different medium, the change of frequency of oscillation is to measure the DIELECTRIC CONSTANT ε of medium, and then by one to utilize electromagnetic wave
Fixed corresponding relation is finally inversed by soil moisture θ v.
Summary of the invention
It is an object of the invention to provide a kind of based on frequency domain reflection principle (Frequency Domain
Reflectometry, FDR) soil humidity sensor, during measurement, insert the sensors into be embedded in advance detection place PVC
In pipe, according to feedback frequency signal, obtain the voltage relevant to the dielectric constant of soil or current output signal, to realize soil
The earth moisture content i.e. measurement of soil moisture.Its operation principle is: oscillating unit output 100MHz standard test frequency signal, via
Driver element is added to export on probe, and according to different soil moisture situations, feedback probe obtains relevant to soil moisture situation
Feedback signal, via feedback data collecting unit, the amplifying unit output voltage signal relevant to soil moisture situation, or warp
By the current signal that apolegamy cell voltage-current conversion unit output is relevant to soil moisture situation, it can be implemented in necessarily
Single-point single-depth in regional extent, multiple spot many deep soils moisture measurement.
It is a further object of the present invention to provide a kind of soil humidity sensor realizing curtage output, can facilitate
Connecting various test instrunment, electric current output has the strongest capacity of resisting disturbance, beneficially long-distance transmissions.
It is yet another object of the invention to provide a kind of soil humidity sensor easily, only need to be inserted into and be embedded in advance
In the pvc pipe in detection place, the measurement time only needs short several seconds.
Hereinafter i.e. to above-mentioned purpose, it is described with reference to the accompanying drawings preferred embodiment.
Accompanying drawing explanation
Fig. 1 show the block diagram of the sensor internal structure according to present pre-ferred embodiments.
Fig. 2 show the sensor blocks figure according to second embodiment of the invention.
Detailed description of the invention
[first embodiment]
Fig. 1 show the block diagram of the sensor internal structure according to present pre-ferred embodiments.In Fig. 1, sensor
Including power module 20, oscillating unit 31, driver element 32, output probe 33, feedback probe 41, feedback data collecting unit
42, amplifying unit 43, Voltage-current conversion unit 44, power input line road 11 and voltage/current outlet line 12,.Wherein electricity
Piezo-electric stream-converting unit 44 is apolegamy unit.
Seeing Fig. 1, oscillating unit 31 exports 100MHz standard test frequency signal, is added to output via driver element 32 and visits
On pin 33, according to different soil moisture situations, feedback probe 41 obtains the feedback signal relevant to soil moisture situation, via
The voltage signal that the output of feedback data collecting unit 42, amplifying unit 43 is relevant to soil moisture situation, or via apolegamy unit
The current signal that Voltage-current conversion unit 44 output is relevant to soil moisture situation.
[the second embodiment]
Fig. 2 show the sensor blocks figure according to second embodiment of the invention.In Fig. 2, sensor includes that frequency domain is anti-
Penetrate formula soil humidity sensor main body 1, output probe 33, feedback probe 41, power supply and output cable 10 and Voltage-current conversion
Unit 44.Wherein Voltage-current conversion unit 44 is apolegamy unit.
Seeing Fig. 2, frequency domain reflection-type soil humidity sensor main body 1 uses resin embedding, output probe 33 and symmetrical point
The feedback probe 41 of cloth uses rustless steel probe, can effectively prevent soil, moisture and other material to sensor unit, probe
Infringement and impact, as apolegamy unit, it is external that Voltage-current conversion unit 44 is arranged in sensor main, can realize electric current or electricity
Pressure output, the various test instrunments of convenient connection.
Claims (5)
1. a frequency domain reflection-type soil humidity sensor includes, it is characterised in that:
One oscillating unit, in order to produce the stable oscillation stationary vibration frequency signal of 100MHz, oscillating unit uses the crystal of high stability to shake
Swing device, to produce stable 100MHz test frequency signal；
One driver element, in order to drive oscillating unit to reach enough output amplitudes；
One output probe unit, in order to output frequency signal；
One feedback probe unit, in order to input feedback frequency signal；
One feedback data collecting unit, in order to conversion feedback frequency signal, feedback data collecting unit uses high precision collecting to turn
Change circuit, to realize the conversion of high-precision data and to gather；
One amplifying unit, in order to amplify feedback data collecting unit output signal, amplifying unit uses low-power consumption differential amplification electricity
Road, eliminates DC level and disturbs and reduce biosensor power consumption；
One power module, in order to produce power supply signal needed for each unit circuit；
One Voltage-current conversion unit, in order to realize voltage-to-current output conversion, Voltage-current conversion unit uses linear electricity
Piezo-electric circulation is changed, to ensure output signal accuracy during long-distance transmissions；
During measurement, insert the sensors in the pvc pipe being embedded in detection place in advance, according to feedback frequency signal, obtain and soil
Voltage that the dielectric constant of earth is relevant or current output signal, to realize the soil moisture content i.e. measurement of soil moisture；
The operation principle of one frequency domain reflection-type soil humidity sensor: oscillating unit output 100MHz standard test frequency signal,
Being added to export on probe via driver element, according to different soil moisture situations, feedback probe obtains and soil moisture situation
Relevant feedback signal, exports the voltage signal relevant to soil moisture situation via feedback data collecting unit, amplifying unit,
Or via the current signal that apolegamy cell voltage-current conversion unit output is relevant to soil moisture situation.
Frequency domain reflection-type soil humidity sensor the most according to claim 1, its probe includes a rustless steel output probe
Unit and a rustless steel feedback probe unit are constituted.
Frequency domain reflection-type soil humidity sensor the most according to claim 1, its feedback probe unit includes that 2 symmetries are divided
The rustless steel feedback probe of cloth, in order to realize the input of feedback signal.
Frequency domain reflection-type soil humidity sensor the most according to claim 1, its driver element uses high frequency power to amplify
Device, to produce the output signal of enough amplitudes.
Frequency domain reflection-type soil humidity sensor the most according to claim 1, its power module uses low pressure difference linearity steady
Depressor, polarity switching, to realize the supply of the power supply to sensor each unit circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110131573.4A CN102788823B (en) | 2011-05-20 | 2011-05-20 | Frequency domain reflection-type soil humidity sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110131573.4A CN102788823B (en) | 2011-05-20 | 2011-05-20 | Frequency domain reflection-type soil humidity sensor |
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| Publication Number | Publication Date |
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| CN102788823A CN102788823A (en) | 2012-11-21 |
| CN102788823B true CN102788823B (en) | 2016-12-21 |
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| CN201110131573.4A Expired - Fee Related CN102788823B (en) | 2011-05-20 | 2011-05-20 | Frequency domain reflection-type soil humidity sensor |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103439276B (en) * | 2013-08-26 | 2015-09-30 | 浙江大学 | A kind of measuring method of soil water content and sensor |
| CN105075809A (en) * | 2015-04-20 | 2015-11-25 | 华北水利水电大学 | Field identification irrigation system based on PLC automatic control |
| CN106652409A (en) * | 2016-12-01 | 2017-05-10 | 重庆君农哥科技有限公司 | Wireless sensing terminal device |
| CN109425551B (en) * | 2017-08-22 | 2021-06-04 | 湖南省气象技术装备中心 | Method for calibrating undisturbed soil of FDR frequency domain reflection type soil moisture sensor |
| JP6996738B2 (en) * | 2017-10-27 | 2022-01-17 | ラピスセミコンダクタ株式会社 | measuring device |
| CN108303398A (en) * | 2017-12-27 | 2018-07-20 | 国电大渡河流域水电开发有限公司 | A kind of system and its detection method that earth material moisture content quickly detects |
| CN113008950A (en) * | 2021-02-13 | 2021-06-22 | 中国科学院南京土壤研究所 | NB-IoT (NB-IoT) -based soil parameter sensor |
| CN117347592A (en) * | 2023-10-24 | 2024-01-05 | 福建天成宝得智能科技有限公司 | Soil humidity detection device and system |
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| CN1258008A (en) * | 1998-12-22 | 2000-06-28 | Ict国际有限公司 | Sensor |
| CN2840031Y (en) * | 2005-09-05 | 2006-11-22 | 南京埃森环境技术有限公司 | The little water detector of online resistance-capacitance type sulfur hexafluoride |
| DE102006034931A1 (en) * | 2006-07-28 | 2008-01-31 | E + E Elektronik Ges.M.B.H. | Circuit arrangement and method for moisture measurement |
| CN201464410U (en) * | 2009-07-08 | 2010-05-12 | 北京市农林科学院 | High-frequency capacitance type soil humidity sensor |
| CN201583512U (en) * | 2009-11-30 | 2010-09-15 | 厦门翔丰节水设备有限公司 | Controller for inducing soil moisture |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1258008A (en) * | 1998-12-22 | 2000-06-28 | Ict国际有限公司 | Sensor |
| CN2840031Y (en) * | 2005-09-05 | 2006-11-22 | 南京埃森环境技术有限公司 | The little water detector of online resistance-capacitance type sulfur hexafluoride |
| DE102006034931A1 (en) * | 2006-07-28 | 2008-01-31 | E + E Elektronik Ges.M.B.H. | Circuit arrangement and method for moisture measurement |
| CN201464410U (en) * | 2009-07-08 | 2010-05-12 | 北京市农林科学院 | High-frequency capacitance type soil humidity sensor |
| CN201583512U (en) * | 2009-11-30 | 2010-09-15 | 厦门翔丰节水设备有限公司 | Controller for inducing soil moisture |
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