CN102788823A - Frequency domain reflection-type soil humidity sensor - Google Patents
Frequency domain reflection-type soil humidity sensor Download PDFInfo
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- CN102788823A CN102788823A CN2011101315734A CN201110131573A CN102788823A CN 102788823 A CN102788823 A CN 102788823A CN 2011101315734 A CN2011101315734 A CN 2011101315734A CN 201110131573 A CN201110131573 A CN 201110131573A CN 102788823 A CN102788823 A CN 102788823A
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Abstract
The invention provides a soil humidity sensor based on a frequency domain reflection principle, which can realize rapid soil moisture measurement in a single-point single-depth mode or a multi-point multi-depth mode within a certain area range. The frequency domain reflection-type soil humidity sensor adopts current or voltage output, can be connected with various testing devices conveniently; the current output has very strong anti-interference capability, which facilitates long-distance transmission. The frequency domain reflection-type soil humidity sensor is convenient for application; the sensor is only needed to be inserted into a PVC pipe which is embedded at a place to be detected in advance, and the measurement only needs several seconds. The frequency domain reflection-type soil humidity sensor manufactured according to figure 1 has the following function that through the measurement of a soil dielectric constant epsilon, the frequency domain reflection-type soil humidity sensor can realize rapid soil moisture measurement in a single-point single-depth mode or a multi-point multi-depth mode within a certain area range.
Description
Technical field
The present invention relates to a kind of soil humidity sensor, relate in particular to the reflective soil humidity sensor of a kind of frequency domain.
Background technology
Soil moisture content is the important physical parameter of soil; The holard is contact surface water and phreatic tie; In formation, conversion and the consumption process of water resource, play an important role, soil water regime is significant for variation of rainfall runoff yield, evapotranspiration and ecologic environment underlying surface vegetation ecological system etc.Simultaneously, soil moisture content also is a key index in the agricultural production conditions, and the size of soil water content has crucial effects to the growth of crops.The decomposition mineralising of organic nutrient be unable to do without moisture in the soil; The chemical fertilizer that is manured into soil only could dissolve in water; The nutrient ion is to the root system surface migration; And crop root must realize all that to nutrient absorbing therefore measuring and control soil water content effectively is the basis that modern agriculture is produced through the moisture medium.
Soil humidity sensor mainly is used for the measured soil volume moisture content, does soil moisture content monitoring and agricultural irrigation and forestry protection.The measuring method of present soil moisture has a variety of, and the one, the weight moisture capacity of direct measured soil and volumetric moisture content are like oven drying method, neutron appearance method, the conductive the whole bag of tricks of measured soil etc.; Another kind of is to realize through the matric potential of measured soil, like tensiometer method, resistance bolck method, psychrometer method etc.At present; The agrometeorological observation station of China still is traditional oven drying method to the main method of soil moisture measurement; The part station has also been laid some automatic observer devices and has been measured, but the instrument monitoring precision of various models is uneven, can't replace the manual work monitoring of fetching earth.
Since people such as Trop propose to exist between soil moisture content and the soil dielectric constant deterministic monodrome polynomial relation, just opened up a new research direction for the measurement of soil moisture, promptly ask soil moisture content through the specific inductive capacity of measured soil.Utilize electromagnetic wave variation of oscillation frequency in different medium to measure the DIELECTRIC CONSTANTS of medium, and then be finally inversed by soil moisture 0v through certain corresponding relation.
Summary of the invention
The purpose of this invention is to provide that a kind of (it can be implemented in the single-point list degree of depth, many deep soils of multiple spot moisture measurement in the certain area coverage for Frequency Domain Reflectometry, soil humidity sensor FDR) based on the frequency domain principle of reflection.
Another object of the present invention provides a kind of soil humidity sensor of realizing curtage output, can conveniently connect various testing tools, and electric current output has very strong antijamming capability, helps long-distance transmissions.
Another purpose of the present invention provides a kind of soil humidity sensor easily, only need be inserted into to be embedded in advance in the pvc pipe of surveying the place to get final product, and Measuring Time only needs short several seconds.
Below, be described with reference to the accompanying drawings preferred embodiment promptly to above-mentioned purpose.
Description of drawings
Shown in Figure 1 is the block scheme of constructing according to the sensor internal of preferred embodiment of the present invention.
Shown in Figure 2 is sensor blocks figure according to second embodiment of the invention.
Embodiment
[first embodiment]
Shown in Figure 1 is the block scheme of constructing according to the sensor internal of preferred embodiment of the present invention.In Fig. 1; Sensor comprises power module 20, oscillating unit 31, driver element 32, output probe 33, feedback probe 41, feedback data collecting unit 42, amplifying unit 43, voltage-to-current converting unit 44, power input line road 11 and voltage/current outlet line 12.Wherein voltage-to-current converting unit 44 is the apolegamy unit.
Referring to Fig. 1; Oscillating unit 31 output 100MHz standard test frequency signals; Be added on the output probe 33 via driver element 32, according to different soil moisture situation, feedback probe 41 obtains the feedback signal relevant with the soil moisture situation; Via feedback data collecting unit 42, the amplifying unit 43 outputs voltage signal relevant with the soil moisture situation, or via apolegamy cell voltage-current conversion unit 44 outputs current signal relevant with the soil moisture situation.
[second embodiment]
Shown in Figure 2 is sensor blocks figure according to second embodiment of the invention.In Fig. 2, sensor comprises that frequency domain inverse penetrates formula soil humidity sensor main body 1, output probe 33, feedback probe 41, power supply and output cable 10 and voltage-to-current converting unit 44.Wherein voltage-to-current converting unit 44 is the apolegamy unit.
Referring to Fig. 2; The feedback probe 41 employing stainless steel probes that the reflective soil humidity sensor main body 1 of frequency domain adopts resin embedding, output probe 33 and is symmetrically distributed; Can effectively prevent infringement and the influence to sensor unit, probe of soil, moisture and other material, as the apolegamy unit, voltage-to-current converting unit 44 is configured in outside the sensor main body; Can realize curtage output, the various testing tools of convenient connection.
Claims (10)
1. the reflective soil humidity sensor of a frequency domain comprises
One oscillating unit is in order to produce the stable oscillation stationary vibration frequency signal of 100MHz;
One driver element is in order to drive oscillating unit to reach enough output amplitudes;
One output probe unit is in order to output frequency signal;
One feedback probe unit is in order to the input feedback frequency signal;
One feedback data collecting unit is in order to the conversion feedback frequency signal;
One amplifying unit is in order to amplify feedback data collecting unit output signal;
One power module is in order to produce the required power supply signal of each element circuit;
One voltage-to-current converting unit is in order to realize voltage-to-current output conversion.
It is characterized in that: according to feedback frequency signal, obtaining voltage or the current output signal relevant with the specific inductive capacity of soil, is the measurement of soil moisture to realize soil moisture content.
2. like the reflective soil humidity sensor of right 1 described frequency domain, its probe comprises that a stainless steel output probe unit and a stainless steel feedback probe unit constitute.
3. the stainless steel feedback probe that comprises 2 symmetrical distributions like right 2 described feedback probe unit is in order to realize the input of feedback signal.
4. like the reflective soil humidity sensor of right 1 described frequency domain, its oscillating unit adopts the crystal oscillator of high stability, to produce stable 100MHz test frequency signal.
5. like the reflective soil humidity sensor of right 1 described frequency domain, its driver element adopts high frequency power amplifier, to produce the output signal of enough amplitudes.
6. like the reflective soil humidity sensor of right 1 described frequency domain, its feedback data collecting unit adopts the high precision collecting change-over circuit, to realize high-precision data-switching and collection.
7. like the reflective soil humidity sensor of right 1 described frequency domain, its amplifying unit adopts the low-power consumption differential amplifier circuit, eliminates the DC level interference and reduces the sensor power consumption.
8. like the reflective soil humidity sensor of right 1 described frequency domain, its power module adopts low pressure difference linear voltage regulator, polarity switching, to realize the power supply supply to each element circuit of sensor.
9. like the reflective soil humidity sensor of right 1 described frequency domain, its voltage-to-current converting unit adopts linear voltage-current conversion, the output signal accuracy during with the assurance long-distance transmissions.
10. like the reflective soil humidity sensor of right 1 described frequency domain, it is characterized in that it is soil moisture that specific inductive capacity through measured soil comes the measured soil volumetric moisture content.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110131573.4A CN102788823B (en) | 2011-05-20 | 2011-05-20 | Frequency domain reflection-type soil humidity sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110131573.4A CN102788823B (en) | 2011-05-20 | 2011-05-20 | Frequency domain reflection-type soil humidity sensor |
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| CN102788823A true CN102788823A (en) | 2012-11-21 |
| CN102788823B CN102788823B (en) | 2016-12-21 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103439276A (en) * | 2013-08-26 | 2013-12-11 | 浙江大学 | Method for measuring water content of soil 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 |
| 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 |
| CN109425551A (en) * | 2017-08-22 | 2019-03-05 | 湖南省气象技术装备中心 | A kind of method of the reflective soil moisture sensor original-state soil calibration of FDR frequency domain |
| CN109725024A (en) * | 2017-10-27 | 2019-05-07 | 拉碧斯半导体株式会社 | Measuring device |
| 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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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103439276A (en) * | 2013-08-26 | 2013-12-11 | 浙江大学 | Method for measuring water content of soil 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 |
| CN109425551A (en) * | 2017-08-22 | 2019-03-05 | 湖南省气象技术装备中心 | A kind of method of the reflective soil moisture sensor original-state soil calibration of FDR frequency domain |
| 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 |
| CN109725024A (en) * | 2017-10-27 | 2019-05-07 | 拉碧斯半导体株式会社 | Measuring device |
| CN109725024B (en) * | 2017-10-27 | 2023-04-28 | 拉碧斯半导体株式会社 | 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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| CN102788823B (en) | 2016-12-21 |
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