CN105738418A - Soil moisture detector suitable for different soil depths - Google Patents
Soil moisture detector suitable for different soil depths Download PDFInfo
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- CN105738418A CN105738418A CN201610194101.6A CN201610194101A CN105738418A CN 105738418 A CN105738418 A CN 105738418A CN 201610194101 A CN201610194101 A CN 201610194101A CN 105738418 A CN105738418 A CN 105738418A
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- soil moisture
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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
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Abstract
The invention discloses a soil moisture detector suitable for different soil depths. The soil moisture detector comprises a soil moisture sensor and a data collecting display instrument in communication connection with the soil moisture sensor, wherein the soil moisture sensor comprises a shell; the shell is divided into a front shell and a rear shell which are sealed through epoxy resin; an electronic circuit device plate and a shield cable are arranged in the shell; a passive crystal oscillator which generates vibration through a clock circuit is integrated on the electronic circuit device plate; a schmitt trigger, a signal attenuator, a probe, a true virtual value detector and a power filtering circuit are successively connected with the passive crystal oscillator; the power filtering circuit can be used for supplying a stable and ripple wave-free work voltage. The soil moisture detector is low in cost, simple in structure, capable of detecting in real time and suitable for soil moisture detection at different soil depths.
Description
Technical field
The invention belongs to technical field of agriculture science, particularly relate to a kind of soil moisture measuring instrument.
Background technology
Soil moisture is one of key factor affecting crop growth, and it is closely related with the upgrowth situation of crops.In precision agriculture produces, need long term monitoring and the moisture information obtained in time in soil, to realize Precision Irrigation, thus reaching to meet the physiological water requirement requirement of crops, not causing again the waste of water resource, this is accomplished by a kind of soil moisture test device.
The measuring method of soil moisture has: oven drying method, NEUTRON METHOD, electric-resistivity method, capacitance method, TDR (time domain reflectometry), FDR (frequency domain bounce technique) and SWR (standing wave method).Oven drying method certainty of measurement is high, but needs sampling and measuring, and the cycle of measuring is long, is not suitable for real-time measurement；NEUTRON METHOD is that the hydrogen atom Absorption to the ray that neutron source is launched measures, and precision is high and real-time, but environment and the mankind can be damaged by technical sophistication and neutron ray；Electric-resistivity method and capacitance method are that the dielectric property utilizing soil is measured indirectly, and speed is fast, but the adaptability of soil is poor；TDR and FDR is external patented technology, and certainty of measurement is significantly high, but circuit is complicated, technical difficulty big, causes that cost is high, reaches thousands of even millions of dollars；SWR method adopts sophisticated signal source, by the method measuring rate in skin, cost can be made to be down to hundreds of unit, but for for agricultural extension application, cost or higher.Consider the factors such as technical difficulty, cost, precision, real-time, in current soil moisture measuring method, comparatively general with dielectric method.But extensive stock dielectric method soil moisture sensor is in the majority with stylus structure at present, this structure has the features such as geometry is simple, easy to make, but by the impact of intensity of probe, the length of probe can not be oversize, thus limiting the scope of the soil depth of measurement；Additionally, due to the reasons such as the overall dimensions of sensor, inconvenient deep layer measurement of being placed into the soil.
Summary of the invention
In view of the above-mentioned problems in the prior art, present invention is primarily targeted at the defect solving prior art, it is provided that a kind of cost is low, simple in construction, can measure and be suitable for the soil moisture measuring instrument of the different soils degree of depth in real time.
The technical solution used in the present invention is as follows:
A kind of soil moisture measuring instrument being suitable for the different soils degree of depth, instrument is shown including soil moisture sensor and the data acquisition being connected with soil moisture sensor communication, soil moisture sensor includes shell, shell is divided into the procapsid by epoxy sealing and back casing two parts, enclosure is provided with electronic circuit device plate and shielded cable, electronic circuit device plate is integrated with the passive crystal oscillator being produced concussion by clock circuit, passive crystal oscillator is connected with Schmidt trigger in turn, signal attenuator, probe, real effective detector and being used for provides stable, the electric source filter circuit of ripple-free running voltage,
Described Schmidt trigger, for becoming a standard block signal by the output signal shaping of passive crystal oscillator；
Described signal attenuator, for reducing the amplitude of the square-wave signal of square wave excitation signal generation unit output, and sends the signal after processing to probe；
Described probe adopts 3PE anticorrosive steel, is at least one, and every probe all comprises positive pole and negative pole two parts, is placed in the soil moisture measurement carrying out the different soils degree of depth in soil to be measured；
Described real effective detector, for carrying out RMS conversion by the signal on probe, so that the waveshape signal on every probe is shown instrument displays with the direct voltage output of equivalence to data acquisition；
When number of probes is more than two, probe is parallel to each other, spacing is identical and length not etc., the moisture situation of different soils depths can be detected simultaneously.
Further, probe is made up of two strip printed circuit board (PCB)s, strip printed circuit board (PCB) is provided with electrical contact district, and strip printed circuit board (PCB) electrically connect with electronic circuit device plate and be formed in one structure, and probe is by electrical contact district collection signal and reaches real effective detector.
Further, described probe length, more than or equal to 1cm, is wider than or equal to 0.2cm, thickness is 0.8-2mm, and the distance of two probes is more than or equal to 0.2cm, and probe end is designed to triangle.
Further, electronic circuit device plate and strip printed circuit board (PCB) are double-layer printing circuit board, the upper and lower surface of strip printed circuit board (PCB) is coated with insulating barrier, it is coated with layers of copper between its one of them surface and insulating barrier, this electrical contact district is positioned at strip printed circuit board (PCB) and is coated with the surrounding on surface of layers of copper and the side of strip printed circuit board (PCB), and this layers of copper extends to surrounding and side place.
Further, the RLC filter circuit that described electric source filter circuit is made up of resistance R1, electric capacity C1 and inductance L1, resistance R1 and inductance L1 are in parallel, and one end of parallel circuit is connected with power supply, the other end of parallel circuit is connected with electric capacity C1, the other end ground connection of electric capacity C1.
In sum, compared with prior art, the invention has the beneficial effects as follows:
What the present invention adopted is passive crystal oscillator, the problem not having voltage, signal level is variable, that is determine according to start-oscillation circuit, same crystal goes for multiple voltage, can be used for the DSP of multiple different clocks signal voltage requirement, and price is generally also relatively low, it is possible to decrease cost；If therefore adopting 3PE anticorrosive steel for the quartz crystal probe that general application condition license suggestion precision is higher, 3PE anticorrosive steel ground floor epoxy powder (FBE > 100um), second layer adhesive (AD) 170～250um, third layer polyethylene (PE) 2.5～3.7mm, three kinds of materials combine together, and form excellent anticorrosive coat with steel pipe strong bonded, existing very strong mechanical strength, there is again very strong corrosion resistance, be suitable for buried soil, the moisture situation of detection depth of soils；In addition, simple in construction, volume are little, low in energy consumption, less costly；Input/output interface is simple, has both been prone to application, has facilitated again the exploitation of secondary instrument and meter；Probe is integrated with whole electronic circuit device plate, and processing technology simplifies；The different depth that can place into the soil carries out real-time and long-term measurement, and the impact being not substantially affected by soil conductance, and soil suitability is good.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is the theory diagram of soil moisture sensor in the present invention；
Fig. 2 is electric source filter circuit schematic diagram of the present invention.
Detailed description of the invention
All features disclosed in this specification, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
As shown in Fig. 1 ~ Fig. 2: a kind of soil moisture measuring instrument being suitable for the different soils degree of depth of the present embodiment, instrument is shown including soil moisture sensor and the data acquisition being connected with soil moisture sensor communication, soil moisture sensor includes shell, shell is divided into the procapsid by epoxy sealing and back casing two parts, enclosure is provided with electronic circuit device plate and shielded cable, electronic circuit device plate is integrated with the passive crystal oscillator being produced concussion by clock circuit, passive crystal oscillator is connected with Schmidt trigger in turn, signal attenuator, probe, real effective detector and being used for provides stable, the electric source filter circuit of ripple-free running voltage, electric source filter circuit respectively with passive crystal oscillator, Schmidt trigger, signal attenuator, real effective detector is connected；
Soil moisture sensor passes through the connection cable interface as its input and output, the power supply input range of the power input interface of connection cable is DC2.7V～5.5V, this connection cable is three heart yearns of shielding mutually, is connected with the power input of sensor circuit, signal output part and ground wire respectively；Electronic circuit device plate and upper each unit (including passive crystal oscillator, Schmidt trigger, signal attenuator, real effective detector etc.) thereof scribble outward marine glue successively；
Described Schmidt trigger, for becoming a standard block signal by the output signal shaping of passive crystal oscillator；
Described signal attenuator, for reducing the amplitude of the square-wave signal of square wave excitation signal generation unit output, and sends the signal after processing to probe；
Described probe adopts 3PE anticorrosive steel, it is at least one, every probe all comprises positive pole and negative pole two parts (this portion of techniques can be realized, and those skilled in the art should know) by prior art, is placed in the soil moisture measurement carrying out the different soils degree of depth in soil to be measured；
Described real effective detector, for carrying out RMS conversion by the signal on probe, so that the waveshape signal on every probe is shown instrument displays with the direct voltage output of equivalence to data acquisition.
When number of probes is more than two, probe is parallel to each other, spacing is identical and length not etc..
Probe is made up of two strip printed circuit board (PCB)s, and strip printed circuit board (PCB) is provided with electrical contact district, and strip printed circuit board (PCB) electrically connect with electronic circuit device plate and be formed in one structure, and probe is by electrical contact district collection signal and reaches real effective detector.
Described probe length is more than or equal to 1cm, it is wider than or equal to 0.2cm, thickness is 0.8-2mm, the distance of two probes is more than or equal to 0.2cm, and probe end is designed to triangle, it is for can easily insert soil that probe end is designed to triangle, and probe only allows the deposited copper in electrical contact district exposed and soil to be measured contacts and surveys.
Electronic circuit device plate and strip printed circuit board (PCB) are double-layer printing circuit board, the upper and lower surface of strip printed circuit board (PCB) is coated with insulating barrier, it is coated with layers of copper between its one of them surface and insulating barrier, this electrical contact district is positioned at strip printed circuit board (PCB) and is coated with the surrounding on surface of layers of copper and the side of strip printed circuit board (PCB), and this layers of copper extends to surrounding and side place.
The RLC filter circuit that described electric source filter circuit is made up of resistance R1, electric capacity C1 and inductance L1, resistance R1 and inductance L1 are in parallel, and one end of parallel circuit is connected with power supply, and the other end of parallel circuit is connected with electric capacity C1, the other end ground connection of electric capacity C1.
Resistance R1 is mainly used to prevent the lc circuit generation resonance of inductance L1 and electric capacity C1 composition.RLC filter circuit on circuit layout close proximity to the power input of active crystal oscillator, at utmost to reduce RF cycle electric current, it is to avoid active crystal oscillator is likely to cause the current loop relevant with resonant frequency to radiate.Wherein, inductance L1 is 1 μ H, resistance R1 is 2.2 Ω, and electric capacity C1 is 0.047 μ F, and the frequency signal of more than 15MHz can be carried out the decay of more than 20dB by this circuit.After external power supply is filtered by RLC filter circuit, resupplies each circuit unit in circuit and use, thus running voltage stable for its offer, ripple-free.
Real effective detector is model is the integrated circuit of AD8361, it is a real effective power detection device, its input and a RC circuit of high pass filter are connected, powered by single supply, running voltage is 2.7V～6.5V, power consumption is very low, have only to consume the electric current of 1.1mA, can by frequency within the scope of 2.5GHz, highest amplitude is the direct voltage output that the simple of 390mV or complicated wave form signal convert equivalence to, its output valve is 7.5 times of incoming wave signal shape real effective, and volume is little, only 6 pins, peripheral circuit is also very simple, have only to 4 electric capacity C2, C3, C4, a C5 and resistance R3.Wherein, electric capacity C2 and electric capacity C3 is the decoupling capacitor of AD8361, for further filtering out noise and the ripple of power supply, provides a clean running voltage for AD8361；Electric capacity C5 is used for reducing AD8361 and exports the noise of signal；The input impedance of resistance R3 and electric capacity C4 and AD8361 itself constitutes a high-pass filtering circuit, only allow higher than a certain frequency signal enter AD8361 signal input part, parameter according to this circuit calculates, and the frequency waveshape signal higher than 10kHz can be carried out the real effective detection of power by AD8361.In described RC high pass filter circuit, the capacity of electric capacity C4 is 1pF-0.1F, is connected between input and the probe of real effective detector；Resistance R2 is 75 Ω-95, is connected between electric capacity C4 and ground wire
Description of the invention and application are illustrative, are not wishing to limit the scope of the invention in above-described embodiment.The deformation of embodiments disclosed herein and change are possible, for those skilled in the art embodiment replace and the various parts of equivalence are known.It should be appreciated by the person skilled in the art that when without departing from the spirit of the present invention or substitutive characteristics, the present invention can otherwise, structure, layout, ratio, and realize with other elements, material and parts.
Claims (5)
1. the soil moisture measuring instrument being suitable for the different soils degree of depth, instrument is shown including soil moisture sensor and the data acquisition being connected with soil moisture sensor communication, it is characterized in that, soil moisture sensor includes shell, shell is divided into the procapsid by epoxy sealing and back casing two parts, enclosure is provided with electronic circuit device plate and shielded cable, electronic circuit device plate is integrated with the passive crystal oscillator being produced concussion by clock circuit, passive crystal oscillator is connected with Schmidt trigger in turn, signal attenuator, probe, real effective detector and being used for provides stable, the electric source filter circuit of ripple-free running voltage,
Described Schmidt trigger, for becoming a standard block signal by the output signal shaping of passive crystal oscillator；
Described signal attenuator, for reducing the amplitude of the square-wave signal of square wave excitation signal generation unit output, and sends the signal after processing to probe；
Described probe adopts 3PE anticorrosive steel, is at least one, and every probe all comprises positive pole and negative pole two parts, is placed in the soil moisture measurement carrying out the different soils degree of depth in soil to be measured；
Described real effective detector, for carrying out RMS conversion by the signal on probe, so that the waveshape signal on every probe is shown instrument displays with the direct voltage output of equivalence to data acquisition；
When number of probes is more than two, probe is parallel to each other, spacing is identical and length not etc..
2. a kind of soil moisture measuring instrument being suitable for the different soils degree of depth according to claim 1, it is characterized in that, probe is made up of two strip printed circuit board (PCB)s, strip printed circuit board (PCB) is provided with electrical contact district, strip printed circuit board (PCB) electrically connects with electronic circuit device plate and is formed in one structure, and probe gathers signal by electrically contacting district and reaches real effective detector.
3. a kind of soil moisture measuring instrument being suitable for the different soils degree of depth according to claim 2, it is characterised in that described probe length is more than or equal to 1cm, it is wider than or equal to 0.2cm, thickness is 0.8-2mm, and the distance of two probes is more than or equal to 0.2cm, and probe end is designed to triangle.
4. a kind of soil moisture measuring instrument being suitable for the different soils degree of depth according to claim 2, it is characterized in that, electronic circuit device plate and strip printed circuit board (PCB) are double-layer printing circuit board, the upper and lower surface of strip printed circuit board (PCB) is coated with insulating barrier, it is coated with layers of copper between its one of them surface and insulating barrier, this electrical contact district is positioned at strip printed circuit board (PCB) and is coated with the surrounding on surface of layers of copper and the side of strip printed circuit board (PCB), and this layers of copper extends to surrounding and side place.
5. a kind of soil moisture measuring instrument being suitable for the different soils degree of depth according to claim 1, it is characterized in that, the RLC filter circuit that described electric source filter circuit is made up of resistance R1, electric capacity C1 and inductance L1, resistance R1 and inductance L1 is in parallel, one end of parallel circuit is connected with power supply, the other end of parallel circuit is connected with electric capacity C1, the other end ground connection of electric capacity C1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610194101.6A CN105738418A (en) | 2016-03-31 | 2016-03-31 | Soil moisture detector suitable for different soil depths |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610194101.6A CN105738418A (en) | 2016-03-31 | 2016-03-31 | Soil moisture detector suitable for different soil depths |
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| CN105738418A true CN105738418A (en) | 2016-07-06 |
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| CN201610194101.6A Pending CN105738418A (en) | 2016-03-31 | 2016-03-31 | Soil moisture detector suitable for different soil depths |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107402243A (en) * | 2017-08-16 | 2017-11-28 | 济南大学 | A kind of method of capacitance type sensor measurement plant water content |
| CN108449989A (en) * | 2015-06-15 | 2018-08-24 | 联邦科学与工业研究组织 | Edaphic condition analysis system and method |
| CN110954662A (en) * | 2019-12-16 | 2020-04-03 | 湖州运宝童装贸易有限公司 | Digital factory data sample collection system of tailoring |
-
2016
- 2016-03-31 CN CN201610194101.6A patent/CN105738418A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108449989A (en) * | 2015-06-15 | 2018-08-24 | 联邦科学与工业研究组织 | Edaphic condition analysis system and method |
| CN107402243A (en) * | 2017-08-16 | 2017-11-28 | 济南大学 | A kind of method of capacitance type sensor measurement plant water content |
| CN110954662A (en) * | 2019-12-16 | 2020-04-03 | 湖州运宝童装贸易有限公司 | Digital factory data sample collection system of tailoring |
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Application publication date: 20160706 |