CN205643230U - Be suitable for soil moisture detector of different soil degree of depth - Google Patents
Be suitable for soil moisture detector of different soil degree of depth Download PDFInfo
- Publication number
- CN205643230U CN205643230U CN201620259226.8U CN201620259226U CN205643230U CN 205643230 U CN205643230 U CN 205643230U CN 201620259226 U CN201620259226 U CN 201620259226U CN 205643230 U CN205643230 U CN 205643230U
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- China
- Prior art keywords
- soil moisture
- probe
- signal
- depth
- circuit board
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Abstract
The utility model discloses a be suitable for soil moisture detector of different soil degree of depth, include soil moisture sensor and the data acquisition display instrument who is connected with the communication of soil moisture sensor, the soil moisture sensor includes the shell, the shell is divided into procapsid and back casing two parts through epoxy resin sealing, inside electronic circuit device board and the shielded cable of being equipped with of shell, the integrated passive crystal oscillator who has through clock circuit production shock on the electronic circuit device board, passive crystal oscillator has connected gradually schmidt trigger, the signal attenuation ware, the probe, true RMS detector and be used for providing stable, no ripple operating voltage's power filter circuit. The utility model discloses with low costs, simple structure, can the real -time measurement and be suitable for the soil moisture of the different soil degree of depth.
Description
Technical field
This utility model belongs to technical field of agriculture science, particularly relates 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 obtain the moisture information in soil in time, to realize Precision Irrigation, from
And reach to meet the physiological water requirement requirement of crops, and the most not causing 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
Measure in real time；NEUTRON METHOD is that the Absorption of the ray that neutron source is launched is measured by hydrogen atom, precision height and real-time
By force, but environment and the mankind can be damaged by technical sophistication and neutron ray；Electric-resistivity method and capacitance method are to utilize Jie of soil
Electrical characteristics are measured indirectly, and speed is fast, but poor to the adaptability of soil；TDR and FDR is external patented technology, measures
Precision is the highest, but circuit is complicated, technical difficulty big, causes cost high, reaches thousands of even millions of dollars；SWR method uses
Sophisticated signal source, by the method measuring rate in skin, can make cost be down to hundreds of unit, but for applying in agricultural extension,
Cost or higher.Consider the factors such as technical difficulty, cost, precision, real-time, in current soil moisture measuring method,
The most universal with dielectric method.But extensive stock dielectric method soil moisture sensor is in the majority with stylus structure at present, this structure
Having the features such as geometry is simple, easy to make, but affected by intensity of probe, the length of probe can not be oversize, thus limits
Make the scope of the soil depth measured；Additionally, due to the reasons such as the overall dimensions of sensor, inconvenient deep layer of being placed into the soil
Measure.
Utility model content
In view of the above-mentioned problems in the prior art, main purpose of the present utility model is to solve lacking of prior art
Fall into, it is provided that a kind of low cost, 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 adopted in the utility model is as follows:
A kind of soil moisture measuring instrument being suitable for the different soils degree of depth, passes including soil moisture sensor with soil moisture
The data acquisition display instrument that sensor communication connects, soil moisture sensor includes that shell, shell are divided into by epoxy resin close
The procapsid of envelope and back casing two parts, enclosure is provided with electronic circuit device plate and shielded cable, electronic circuit device plate
On be integrated with by clock circuit produce concussion passive crystal oscillator, passive crystal oscillator is connected with Schmidt trigger in turn, signal declines
Subtract device, probe, real effective detector and for providing stable, the electric source filter circuit of ripple-free running voltage,
Described Schmidt trigger, for being shaped to a standard block signal by the output signal 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 will
Signal after process sends to probe；
Described probe uses 3PE anticorrosive steel, and at least one, every probe all comprises positive pole and negative pole two parts, is placed in
Soil to be measured carries out the soil moisture measurement of the different soils degree of depth；
Described real effective detector, for carrying out RMS conversion by the signal on probe, with by every probe
Waveshape signal with equivalence direct voltage output to data acquisition show instrument show；
When number of probes is more than two, probe is parallel to each other, spacing is identical and length, can detect difference simultaneously
The moisture situation of depth of soils.
Further, probe is made up of two strip printed circuit board (PCB)s, and strip printed circuit board (PCB) is provided with electrical contact district, long
Bar printed circuit board (PCB) electrically connects with electronic circuit device plate and is formed in one structure, and probe gathers signal also by electrical contact district
Reach real effective detector.
Further, described probe length is more than or equal to 1cm, is wider than or equal to 0.2cm, thickness is 0.8-2mm, two spies
The distance of pin 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, strip printing electricity
Plate upper and lower surface in road is coated with insulating barrier, is coated with layers of copper between its one of them surface and insulating barrier, this electrical contact district
Being positioned at strip printed circuit board (PCB) and be coated with the surrounding on surface and the side of strip printed circuit board (PCB) of layers of copper, this layers of copper extends to four
At week and side.
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 is 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, electric capacity
The other end ground connection of C1.
In sum, compared with prior art, the beneficial effects of the utility model are:
This utility model uses passive crystal oscillator, the problem not having voltage, and signal level is variable, say, that be
Determining according to start-oscillation circuit, same crystal goes for multiple voltage, can be used for multiple different clocks signal voltage
The DSP required, and price is the most relatively low, it is possible to decrease cost；If therefore used for general application condition license suggestion
The quartz crystal probe that precision is higher uses 3PE anticorrosive steel, 3PE anticorrosive steel ground floor epoxy powder (FBE > 100um), the second layer
Adhesive (AD) 170～250um, third layer polyethylene (PE) 2.5～3.7mm, three kinds of materials combine together, and firm with steel pipe
In conjunction with forming excellent anticorrosive coat, the strongest existing mechanical strength, there is again the strongest corrosion resistance, be suitable for buried soil, detection
The moisture situation of depth of soils；In addition, simple in construction, volume is little, low in energy consumption, cost is relatively low；Input/output interface is simple, the most easily
In application, facilitate 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 is not substantially affected by the impact of conductance in soil, fits soil
Answering property is good.
Accompanying drawing explanation
This utility model will illustrate by example and with reference to the appended drawing, wherein:
Fig. 1 is the theory diagram of soil moisture sensor in this utility model；
Fig. 2 is this utility model electric source filter circuit schematic diagram.
Detailed description of the invention
All features disclosed in this specification, or disclosed all methods or during step, except mutually exclusive
Feature and/or step beyond, 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, including soil
Moisture transducer and the data acquisition display instrument being connected with soil moisture sensor communication, outside soil moisture sensor includes
Shell, shell is divided into the procapsid by epoxy sealing and back casing two parts, and 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 successively
Connect and have Schmidt trigger, signal attenuator, probe, real effective detector and for providing stable, ripple-free work
The electric source filter circuit of voltage, electric source filter circuit respectively with passive crystal oscillator, Schmidt trigger, signal attenuator, the most effective
Value detector is connected；
Soil moisture sensor passes through the connection cable interface as its input and output, the power input interface of connection cable
Power supply input range be DC2.7V～5.5V, this connection cable is three heart yearns of mutually shielding, respectively with sensor circuit
Power input, signal output part and ground wire are connected；Electronic circuit device plate and upper each unit thereof (include passive crystal oscillator, Shi Mi
Special trigger, signal attenuator, real effective detector etc.) scribble marine glue the most successively；
Described Schmidt trigger, for being shaped to a standard block signal by the output signal 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 will
Signal after process sends to probe；
Described probe uses 3PE anticorrosive steel, and at least one, every probe all comprises positive pole and negative pole two parts (this portion
Point technology can be realized by prior art, and those skilled in the art should know), it is placed in soil to be measured and carries out different soils
The soil moisture measurement of the degree of depth；
Described real effective detector, for carrying out RMS conversion by the signal on probe, with by every probe
Waveshape signal with equivalence direct voltage output to data acquisition show instrument show.
When number of probes is more than two, probe is parallel to each other, spacing is identical and length.
Probe is made up of two strip printed circuit board (PCB)s, and strip printed circuit board (PCB) is provided with electrical contact district, strip printing electricity
Road plate electrically connects with electronic circuit device plate and is formed in one structure, and probe gathers signal reaching by electrical contact district really to be had
Valid value detector.
Described probe length is more than or equal to 1cm, is wider than or equal to 0.2cm, thickness is 0.8-2mm, the distance of two probes
More than or equal to 0.2cm, and probe end is designed to triangle, and it is for can easily insert soil that probe end is designed to triangle
Earth, 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, and strip printed circuit board (PCB) is upper and lower
Surface is coated with insulating barrier, is coated with layers of copper between its one of them surface and insulating barrier, and this electrical contact district is positioned at strip
Printed circuit board (PCB) is coated with surrounding and the side of strip printed circuit board (PCB) on the surface of layers of copper, 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 electricity
Sense L1 is 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 of electric capacity C1
Ground connection.
Resistance R1 is mainly used to prevent the lc circuit generation resonance of inductance L1 and electric capacity C1 composition.RLC filter circuit is at electricity
Close proximity to the power input of active crystal oscillator in the layout of road, at utmost to reduce RF cycle electric current, it is to avoid active crystal oscillator
The current loop relevant with resonant frequency may be caused to radiate.Wherein, inductance L1 is 1 μ H, and resistance R1 is 2.2 Ω, and electric capacity C1 is
0.047 μ F, this circuit can carry out the decay of more than 20dB to the frequency signal of more than 15MHz.RLC filter circuit is to external power supply
After being filtered, resupply each circuit unit in circuit and use, thus provide stable, a work electricity for ripple-free for it
Pressure.
Real effective detector be model be 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, single supply power, and running voltage is 2.7V～6.5V, and power consumption is the lowest,
Have only to consume the electric current of 1.1mA, can by frequency in the range of 2.5GHz, highest amplitude be the simple of 390mV or complicated wave form
Signal is converted into the direct voltage output of equivalence, and its output valve is 7.5 times of incoming wave signal shape real effective, and volume
Little, only 6 pins, peripheral circuit is the simplest, it is only necessary to 4 electric capacity C2, C3, C4, C5 and a resistance R3.Its
In, electric capacity C2 and electric capacity C3 is the decoupling capacitor of AD8361, for further filtering out noise and the ripple of power supply, carries for AD8361
For a clean running voltage；Electric capacity C5 is used for reducing the noise of AD8361 output signal；Resistance R3 and electric capacity C4 with
The input impedance of AD8361 itself constitutes a high-pass filtering circuit, only allows and enters the letter of AD8361 higher than the signal of a certain frequency
Number input, calculates according to the parameter of this circuit, and AD8361 can carry out the true of power to the frequency waveshape signal higher than 10kHz
RMS to DC.In described RC high pass filter circuit, the capacity of electric capacity C4 is 1pF-0.1F, is connected on real effective detector
Between input and probe；Resistance R2 is 75 Ω-95, is connected between electric capacity C4 and ground wire
Description of the present utility model and application are illustrative, are not wishing to scope of the present utility model is limited in above-mentioned reality
Execute in example.The deformation of embodiments disclosed herein and change are possible, come for those skilled in the art
Say that replacing with equivalent various parts of embodiment is known.It should be appreciated by the person skilled in the art that without departing from this
In the case of the spirit or essential characteristics of utility model, this utility model can otherwise, structure, layout, ratio, and
Realize with other elements, material and parts.
Claims (5)
1. it is suitable for a soil moisture measuring instrument for the different soils degree of depth, senses including soil moisture sensor with soil moisture
The data acquisition display instrument that device communication connects, it is characterised in that soil moisture sensor includes that shell, shell are divided into and passes through ring
The procapsid of epoxy resins sealing and back casing two parts, enclosure is provided with electronic circuit device plate and shielded cable, electric wire
Being integrated with the passive crystal oscillator being produced concussion by clock circuit on the device board of road, passive crystal oscillator is connected with schmidt trigger in turn
Device, signal attenuator, probe, real effective detector and for providing stable, the power filter electricity of ripple-free running voltage
Road,
Described Schmidt trigger, for being shaped to a standard block signal by the output signal 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 will process
After signal send to probe；
Described probe uses 3PE anticorrosive steel, and at least one, every probe all comprises positive pole and negative pole two parts, is placed in be measured
Soil carries out the soil moisture measurement of the different soils degree of depth；
Described real effective detector, for carrying out RMS conversion by the signal on probe, with by the ripple on every probe
Shape signal shows to data acquisition display instrument with the direct voltage output of equivalence；
When number of probes is more than two, probe is parallel to each other, spacing is identical and length.
A kind of soil moisture measuring instrument being suitable for the different soils degree of depth the most according to claim 1, it is characterised in that probe
Being 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) and electric wire
Road device board electrical connection and the structure that is formed in one, probe is gathered signal by electrical contact district and is reached real effective detector.
A kind of soil moisture measuring instrument being suitable for the different soils degree of depth the most according to claim 2, it is characterised in that described
Probe length is 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.
A kind of soil moisture measuring instrument being suitable for the different soils degree of depth the most according to claim 2, it is characterised in that electronics
Line device plate and strip printed circuit board (PCB) are double-layer printing circuit board, and the upper and lower surface of strip printed circuit board (PCB) is coated with
Insulating barrier, is coated with layers of copper between its one of them surface and insulating barrier, and this electrical contact district is positioned at strip printed circuit board (PCB) and is coated with
Being covered with surrounding and the side of strip printed circuit board (PCB) on the surface of layers of copper, this layers of copper extends at surrounding and side.
A kind of soil moisture measuring instrument being suitable for the different soils degree of depth the most according to claim 1, it is characterised in that described
The RLC filter circuit that 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 connection 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620259226.8U CN205643230U (en) | 2016-03-31 | 2016-03-31 | Be suitable for soil moisture detector of different soil degree of depth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620259226.8U CN205643230U (en) | 2016-03-31 | 2016-03-31 | Be suitable for soil moisture detector of different soil degree of depth |
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| Publication Number | Publication Date |
|---|---|
| CN205643230U true CN205643230U (en) | 2016-10-12 |
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ID=57065948
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620259226.8U Expired - Fee Related CN205643230U (en) | 2016-03-31 | 2016-03-31 | Be suitable for soil moisture detector of different soil degree of depth |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060046A (en) * | 2018-10-31 | 2018-12-21 | 山东省烟台市农业科学研究院 | A kind of multilevel soil sensor |
-
2016
- 2016-03-31 CN CN201620259226.8U patent/CN205643230U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060046A (en) * | 2018-10-31 | 2018-12-21 | 山东省烟台市农业科学研究院 | A kind of multilevel soil sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161012 Termination date: 20190331 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |