CN108051485A - Soil moisture measurement method and soil moisture sensor - Google Patents
Soil moisture measurement method and soil moisture sensor Download PDFInfo
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- CN108051485A CN108051485A CN201711337736.8A CN201711337736A CN108051485A CN 108051485 A CN108051485 A CN 108051485A CN 201711337736 A CN201711337736 A CN 201711337736A CN 108051485 A CN108051485 A CN 108051485A
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- G—PHYSICS
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- 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
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
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Abstract
The present invention relates to a kind of soil moisture measurement method and soil moisture sensors.This method exports square-wave signal, and square-wave signal is continuous and fixed frequency and amplitude；It is related to soil moisture content by the amplitude and cycle, the capacitance of inductance capacitance of inductance capacitance variation square-wave signal；Signal after variation is changed to equivalent d. c. voltage signal；Using equivalent d. c. voltage signal as measurement result.The method of the present invention exports the continuous and square-wave signal of fixed frequency and amplitude, change amplitude and the cycle of square-wave signal by inductance capacitance relevant with soil moisture content, signal after variation is changed to equivalent d. c. voltage signal, using equivalent d. c. voltage signal as measurement result, using capacitive sensing techniques, volumetric(al) moisture content is measured for direct conduction pattern, there is high real-time and high accuracy, while wider moisture scope can be measured.
Description
Technical field
The present invention relates to data acquisition technology fields more particularly to a kind of soil moisture measurement method and soil moisture to sense
Device.
Background technology
At present, it is in the scientific research projects such as ecological environment, agricultural, the hydrology and water and soil conservation to the detection of soil moisture and variation
Basic work.Soil is made of substantially four kinds of dielectric materials, i.e. air, soil solids matter, irreducible water and Free water.Its
Soil volumetric water content variation is mainly the variation of free water content, and there are many measurement method, Yi Leishi for soil moisture at this stage
The weight water content and volume moisture content of soil are directly measured, it is another kind of such as weighting method after dried or measurement soil conductibility, be
Measure the mechanism gesture of soil, such as tensiometer method, psychrometer method.
It is still the most universal with the Method of Dielectric Coefficient of capacitance principle in the method for current measurement soil moisture, do not destroying soil
In the case of earth reset condition, feature has the advantages such as corresponding speed is fast, and measurement error is small, and structure and measurement process are simple.
But oven drying method or weight method, measurement needs field sampling and process is cumbersome, can not adapt to portable or become for a long time
The measurement of gesture, it is impossible to the real-time measurement in measurement point is completed, and TDT (TimeDomainTransmission) time domain measurement has
Have quick and precisely, the advantages such as METHOD FOR CONTINUOUS DETERMINATION, but accuracy of its measurement depends on the precision of time of measuring t, and the phase of signal
Mutually interference and capacitance interference are but also the authenticity of measurement result is impacted.
The content of the invention
(1) technical problems to be solved
In order to ensure the high real-time of soil moisture measurement and high accuracy, the present invention provides a kind of soil moisture measurement side
Method and soil moisture sensor export the continuous and square-wave signal of fixed frequency and amplitude, by relevant with soil moisture content
The amplitude of inductance capacitance variation square-wave signal and cycle, the signal after variation is changed to equivalent d. c. voltage signal, will etc.
The d. c. voltage signal of effect, using capacitive sensing techniques, volumetric(al) moisture content, tool is measured for direct conduction pattern as measurement result
There are high real-time and high accuracy, while wider moisture scope can be measured.
(2) technical solution
In order to achieve the above object, the main technical schemes that the present invention uses include：
A kind of soil moisture measurement method, the method, including：
S101, exports square-wave signal, and the square-wave signal is continuous and fixed frequency and amplitude；
S102 is changed amplitude and the cycle of the square-wave signal by inductance capacitance, capacitance and the soil of the inductance capacitance
Earth water content is related；
Signal after variation is changed to equivalent d. c. voltage signal by S103；
S104, using the equivalent d. c. voltage signal as measurement result.
Optionally, the capacitance C of the inductance capacitance is obtained by equation below：
C=k × εr×εo；
Wherein, k is to fix geometric constant, εrFor the relative dielectric constant that whole soil is mixed according to volume ratio, εoFor sky
Dielectric constant in gas or vacuum.
Optionally, the εoFor 8.85~15F/M.
Optionally, the S103 is specifically included：
Signal after variation is carried out or handled；
Will or treated signal in the output waveform that do not transfinite be changed to sinusoidal signal；
Signal after change is filtered to obtain equivalent d. c. voltage signal.
In order to achieve the above object, the main technical schemes that the present invention uses further include：
A kind of soil moisture sensor, the soil moisture sensor include：Circuit board mounting hole (1), circuit main board
(2), emit and receive signal electrode plate (3), cable fixing groove (4), marine glue body case (5), reference electrode plate (6)；
The transmitting and the transmitting of reception signal electrode plate (3) receive induction electrode and the ground of the reference electrode plate (6)
Electrode is integrated with the circuit main board (2)；
The cable fixing groove (4) is located at the circuit main board (2) top, connects for mainboard external power supply and signal cable
It connects.
Optionally, before the marine glue body case (5) seals, fixed cable position is fixed after the hardening of waterproof colloid
Seal the circuit board mounting hole (1), connection cables and mainboard；
There is colloid to run through mainboard in circuit board mounting hole (1).
Optionally, the marine glue body case (5) be silica gel, seal thickness 11mm；
The transmitting and reception signal electrode plate (3) top are tip taper, transmitting and reception signal electrode plate (3) overall length
52mm, thickness 1.8mm, the two poles of the earth spacing between plates are 11mm；
The first half of cable fixing groove (4) is fixed with the circuit main board (2) sealing, formed it is whole, tail seal and
With flexibility；
Circuit board mounting hole (1) is hole reserved on the circuit main board (2).
Optionally, reference electrode plate (6) top is tip taper；
The circuit main board (2) includes：Cover copper electrode, copper foil, upper and lower plate；
The copper electrode that covers is in interlayer；
The copper foil is from 2~3mm of tip position；
The plate sealed insulation up and down, for preventing interlayer copper foil oxidation corrosion；
The needle point is the transmitting and reception signal electrode plate (3) and the tapered edges acies of reference electrode plate (6).
Optionally, the circuit main board (2) includes：First shunt capacitance (2.1), the first supply voltage (2.2), high frequency letter
Number occur chip (2.3), resonant resistance (2.4), signal processing chip (2.5), the first plates capacitance electrode (2.6), the second pole
Plate capacitance electrode (2.7), the second supply voltage (2.8), the second shunt capacitance (2.9), the first power supply cathode (2.10), shake
Frequency adjustment resistance (2.11), the 3rd supply voltage (2.12) are swung, the second power supply cathode (2.13) exports signal filtered electrical
It hinders (2.14), output signal filter capacitor (2.15), the 3rd power supply cathode (2.16), the 4th power supply cathode
(2.17), signal label (2.18) is exported；
Chip (2.3) occurs for the high-frequency signal, for generating the square wave of fixed frequency and amplitude, the high-frequency signal hair
The 4th pin access power supply anode of raw chip (2.3), divides, and frequency division coefficient is 1 for shaking；
The concussion frequency adjustment resistance (2.11), for adjusting the concussion frequency of output, adjustable range for 17~
170MHz；
First shunt capacitance (2.1), for being filtered to the circuit main board (2) feeder ear；
Signal processing chip (2.5) is OR circuit, and the 1st and the 2nd pin of the signal processing chip (2.5) is believed for it
Number input terminal；
Second shunt capacitance (2.9), for being filtered to the circuit main board (2) feeder ear, through OR gate
After the signal output of circuit, the RC being made of output signal filter resistance (2.14) and output signal filter capacitor (2.15) is added in
Filter circuit, for stablizing the useful signal of output.
Optionally, the continuous fixed frequency of chip (2.3) generation and the square-wave signal of amplitude occur for the high-frequency signal, even
The resonance RC circuits being made of the resonant resistance (2.4) and the second plates capacitance electrode (2.7) are connected to, by the letter
The output of number processing chip (2.5) amplitude limit, and the output waveform that will not transfinite is changed to sinusoidal signal, connects the output signal filter afterwards
The RC filter circuits that ripple resistance (2.14) and the output signal filter capacitor (2.15) form；
The resonant resistance (2.4) and the second plates capacitance electrode (2.7) composition inductance capacitance, the inductance capacitance
Capacitance it is related to soil moisture content, the inductance capacitance, for making input to the signal width of the signal processing chip (2.5)
Value and cycle generate corresponding variation；
Capacitance C=k × ε of the inductance capacitancer×εo；
Wherein, k is to fix geometric constant, εrFor the relative dielectric constant that whole soil is mixed according to volume ratio, εoFor sky
Dielectric constant in gas or vacuum.
(3) advantageous effect
The beneficial effects of the invention are as follows：Output is continuous and the square-wave signal of fixed frequency and amplitude, by with soil water-containing
Amplitude and the cycle of relevant inductance capacitance variation square-wave signal are measured, the signal after variation is changed to equivalent DC voltage and is believed
Number, using equivalent d. c. voltage signal as measurement result, using capacitive sensing techniques, measure volume for direct conduction pattern and contain
Water has high real-time and high accuracy, while can measure wider moisture scope.
Description of the drawings
Fig. 1 is a kind of soil moisture measurement method flow diagram provided by one embodiment of the present invention；
Fig. 2 is a kind of portion profile plan view of soil moisture sensor provided by one embodiment of the present invention；
Fig. 3 is a kind of contour structures inclined-plane sectional view of soil moisture sensor provided by one embodiment of the present invention；
Fig. 4 is a kind of functional block diagram of soil moisture sensor provided by one embodiment of the present invention；
Fig. 5 is a kind of induction electrode capacitance variations circuit diagram of circuit main board provided by one embodiment of the present invention.
Specific embodiment
In order to preferably explain the present invention, in order to understand, below in conjunction with the accompanying drawings, by specific embodiment, to this hair
It is bright to be described in detail.
It is still the most universal with the Method of Dielectric Coefficient of capacitance principle in the method for current measurement soil moisture, do not destroying soil
In the case of earth reset condition, feature has the advantages such as corresponding speed is fast, and measurement error is small, and structure and measurement process are simple.But
Oven drying method or weight method, measurement needs field sampling and process is cumbersome, can not adapt to portable or long-time trend measurement, no
Can complete the real-time measurement in measurement point, and TDT time domain measurements have quick and precisely, the advantages such as METHOD FOR CONTINUOUS DETERMINATION, but it is measured
Accuracy depend on time of measuring t precision, and signal interfere with each other with capacitance interference but also measurement result it is true
Reality is impacted.
In order to ensure the high real-time of soil moisture measurement and high accuracy, the present invention provides a kind of soil moisture measurement side
Method and soil moisture sensor export the continuous and square-wave signal of fixed frequency and amplitude, by relevant with soil moisture content
The amplitude of inductance capacitance variation square-wave signal and cycle, the signal after variation is changed to equivalent d. c. voltage signal, will etc.
The d. c. voltage signal of effect, using capacitive sensing techniques, volumetric(al) moisture content, tool is measured for direct conduction pattern as measurement result
There are high real-time and high accuracy, while wider moisture scope can be measured.
Referring to Fig. 1, the soil moisture measurement method shown in the present embodiment realizes that flow is as follows：
S101, exports square-wave signal, and square-wave signal is continuous and fixed frequency and amplitude.
S102 changes amplitude and the cycle of square-wave signal by inductance capacitance.
Wherein, the capacitance of inductance capacitance is related to soil moisture content.
Capacitance C=k × ε of inductance capacitancer×εo。
K is to fix geometric constant, εrFor the relative dielectric constant that whole soil is mixed according to volume ratio, εoFor air or
Dielectric constant in person's vacuum.
Optionally, εoFor 8.85~15F/M.
Signal after variation is changed to equivalent d. c. voltage signal by S103.
This step can be realized by following process：Signal after variation is carried out or handled；Will or treated signal in
The output waveform that do not transfinite is changed to sinusoidal signal；Signal after change is filtered to obtain equivalent DC voltage letter
Number.
S104, using equivalent d. c. voltage signal as measurement result.
Under normal conditions using the total amount of solid-state soil part as fixed amount, when the change of water content in soil, can make
It changes into air and water proportion, directly influences the change of total capacitance value, and then change the shaping width of square-wave signal
Value and frequency occur, and the d. c. voltage signal of output can also change correspondingly.
Convenient, fast and accurately soil moisture survey that the above method that this motion provides can provide for agricultural weather field
Amount scheme changes the present situations such as conventional mounting or sampling difficulty, soil moisture content transformation is monitored in real time in the case where ensureing original soil sample,
Reliable analysis data are provided for agricultural irrigation and environmental monitoring.
Method provided in this embodiment, output is continuous and the square-wave signal of fixed frequency and amplitude, by with soil water-containing
Amplitude and the cycle of relevant inductance capacitance variation square-wave signal are measured, the signal after variation is changed to equivalent DC voltage and is believed
Number, using equivalent d. c. voltage signal as measurement result, using capacitive sensing techniques, measure volume for direct conduction pattern and contain
Water has high real-time and high accuracy, while can measure wider moisture scope.
The present embodiment provides a kind of soil moisture sensors, and referring to Fig. 2, which includes：Circuit board is consolidated
Determine hole (1), circuit main board (2), transmitting and reception signal electrode plate (3), cable fixing groove (4), marine glue body case (5), ginseng
Examine electrode plate (6).
Transmitting and receive signal electrode plate (3) transmitting receive the ground electrode of induction electrode and reference electrode plate (6) with
Circuit main board (2) is integrated.
Cable fixing groove (4) is located at circuit main board (2) top, is connected for mainboard external power supply with signal cable.
Before marine glue body case (5) sealing, fixed cable position, after the hardening of waterproof colloid, fixing seal circuit board
Mounting hole (1), connection cables and mainboard.
There is colloid in circuit board mounting hole (1) through mainboard, the structure for making soil moisture sensor is more firm, Neng Goushi
High intensity is answered to plug.
Transmitting and reception signal electrode plate (3) top are tip taper, and plug is more laborsaving, and can closely be connect with soil
It touches, transmitting and reception signal electrode plate (3) overall length 52mm, thickness 1.8mm, the two poles of the earth spacing between plates is 11mm, its is made to sense water
Divide variation sensitiveer, while there is good anti-interference.
Reference electrode plate (6) top is tip taper.
To improve measurement accuracy, reduction systematic error, circuit main board (2) uses four-layer circuit board, including：Cover copper electrode,
Copper foil, upper and lower plate.Copper electrode is covered in interlayer.Copper foil is from 2~3mm of tip position, upper and lower plate sealed insulation, for preventing
Interlayer copper foil oxidation corrosion
Wherein, needle point for transmitting and receives signal electrode plate (3) and the tapered edges acies of reference electrode plate (6).
The contour structures inclined-plane sectional view of soil moisture sensor shown in Figure 3, marine glue body case (5) are silicon
Glue has high-insulativity, high leakproofness and strong corrosion resistant, seal thickness 11mm.
The first half of cable fixing groove (4) is fixed with circuit main board (2) sealing, is formed whole, tail seal and is had
Certain flexibility prevents that retransmitting plug causes crack at cable interface.
Circuit board mounting hole (1) is the hole reserved on circuit main board (2), is mainly used for reinforcing mainboard and colloid shell, make
Overall structure is more secured in swapping process is repeated.
Soil moisture sensor provided by the invention, implementation principle in power supply input terminal as shown in figure 4, add in LC
Filter circuit reduces input ripple, reduces input noise, square wave concussion waveform generator；It is driven through after the output of its square wave
Resonance circuit is formed by resonant resistance and emission electrode equivalent capacity, inductive waveform is via OR gate signal processing chip, output
End adds in RC filter circuits, its signal output is made more to stablize.
Specifically, referring to Fig. 5, circuit main board (2) includes：First shunt capacitance (2.1), the first supply voltage (2.2) are high
Frequency signal generation chip (2.3), resonant resistance (2.4), signal processing chip (2.5), the first plates capacitance electrode (2.6), the
Two plates capacitance electrodes (2.7), the second supply voltage (2.8), the second shunt capacitance (2.9), the first power supply cathode
(2.10), frequency adjustment resistance (2.11), the 3rd supply voltage (2.12), the second power supply cathode (2.13), output are shaken
Signal filter resistance (2.14), output signal filter capacitor (2.15), the 3rd power supply cathode (2.16), the 4th power supply
Cathode (2.17), output signal label (2.18).
Wherein, the first power supply cathode (2.10), the second power supply cathode (2.13), the 3rd power supply cathode
(2.16) and the 4th power supply cathode (2.17) is external unified power supply cathode.
High-frequency signal occurs chip (2.3) and shakes device as core, mainly for generation of the side of fixed frequency and amplitude
Ripple, the 4th pin that chip (2.3) occurs for high-frequency signal are divided as concussion, and access power supply anode divides for shaking, and point
Frequency coefficient is 1.
Frequency adjustment resistance (2.11) is shaken, for adjusting the concussion frequency of output, adjustable range is 17~170MHz.
First shunt capacitance (2.1), for being filtered to circuit main board (2) feeder ear.
Signal processing chip (2.5) is OR circuit, and the 1st and the 2nd pin of signal processing chip (2.5) is defeated for its signal
Enter end.
Second shunt capacitance (2.9), for being filtered to circuit main board (2) feeder ear, the letter through OR circuit
After number output, add in by output signal filter resistance (2.14) and export signal filter capacitor (2.15) RC filtered electricals for forming
Road, for stablizing the useful signal of output.
High-frequency signal occur chip (2.3) (U1) generate continuous fixed frequency and amplitude square-wave signal, be connected to by
The resonance RC circuits of resonant resistance (2.4) (R1) and the second plates capacitance electrode (2.7) (EA2) composition, by signal processing core
Piece (2.5) (OR gate chip U2) amplitude limit exports, and the output waveform that will not transfinite is changed to sinusoidal signal, rear connection output signal filter
The RC filter circuits that ripple resistance (2.14) (R3) and output signal filter capacitor (2.15) (C3) form make output signal change etc.
The d. c. voltage signal of effect, the measurement result as sensor.
Resonant resistance (2.4) (R1) and the second plates capacitance electrode (2.7) (EA2) composition inductance capacitance, inductance capacitance
Capacitance is related to soil moisture content, changes with the variation of soil moisture content, inductance capacitance, for making input to signal processing core
Signal amplitude and cycle in piece (2.5) (U2) generate corresponding variation.
Capacitance C=k × ε of inductance capacitancer×εo。
Wherein, k is to fix geometric constant, εrFor the relative dielectric constant that whole soil is mixed according to volume ratio, εoFor sky
Dielectric constant in gas or vacuum.
Soil moisture sensor provided in this embodiment uses capacitive sensing techniques, and capacitance can be according to the change of dielectric constant
Change and change, hardware circuit is made of original-party wave generation circuit, RC resonance circuits and shaping filter output circuit, directly to pass
The mode of leading measures volumetric(al) moisture content, has high real-time and high accuracy, while the moisture wider range that can be measured.
Oscillator is using the concussion special chip (chip (2.3) occurs for the high-frequency signal in Fig. 5) of adjustable frequency, frequency tune
The square-wave signal of the amplitudes such as exportable stabilization after the completion of section, induction electrode and reference electrode matching into capacitor model, capacitance with
Change of moisture content and quickly change, by signal processing corresponding output voltage is made to change simultaneously.Production calibration process takes
Know that fixed point volumetric(al) moisture content and the voltage value of corresponding measurement output carry out mathematical modeling, rear matched curve and calculation formula.Make
Soil moisture sensor measurement range provided in this embodiment is wider, precision is higher, portable and can measure in real time.
Soil moisture sensor provided in this embodiment, including：Circuit board mounting hole, circuit main board, transmitting and reception letter
Number electrode plate, cable fixing groove, marine glue body case, reference electrode plate, by exporting the continuous and side of fixed frequency and amplitude
Ripple signal changes amplitude and the cycle of square-wave signal by inductance capacitance relevant with soil moisture content, by the signal after variation
Equivalent d. c. voltage signal is changed to, using equivalent d. c. voltage signal as measurement result, using capacitive sensing techniques, is
Direct conduction pattern measurement volumetric(al) moisture content, has high real-time and high accuracy, while can measure wider moisture scope.
It should be clear that the invention is not limited in particular configuration described above and shown in figure and processing.
For brevity, it is omitted here the detailed description to known method.In the above-described embodiments, several tools have been described and illustrated
The step of body, is as example.But procedure of the invention is not limited to described and illustrated specific steps, this field
Technical staff can be suitable between being variously modified, change and add or changing the step after the spirit of the present invention is understood
Sequence.
It should also be noted that, the exemplary embodiment referred in the present invention, is retouched based on a series of step or device
State certain methods or system.But the present invention is not limited to the order of above-mentioned steps, that is to say, that can be according in embodiment
The order referred to performs step, may also be distinct from that the order in embodiment or several steps perform simultaneously.
Finally it should be noted that：Above-described embodiments are merely to illustrate the technical scheme rather than to it
Limitation；Although the present invention is described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that：
It can still modify to the technical solution recorded in previous embodiment or to which part or all technical characteristic into
Row equivalent substitution；And these modifications or substitutions, the essence of appropriate technical solution is not made to depart from various embodiments of the present invention technical side
The scope of case.
Claims (10)
- A kind of 1. soil moisture measurement method, which is characterized in that the method, including：S101, exports square-wave signal, and the square-wave signal is continuous and fixed frequency and amplitude；S102 is changed amplitude and the cycle of the square-wave signal by inductance capacitance, and capacitance and the soil of the inductance capacitance contain Water is related；Signal after variation is changed to equivalent d. c. voltage signal by S103；S104, using the equivalent d. c. voltage signal as measurement result.
- 2. according to the method described in claim 1, it is characterized in that, the capacitance C of the inductance capacitance is obtained by equation below：C=k × εr×εo；Wherein, k is to fix geometric constant, εrFor the relative dielectric constant that whole soil is mixed according to volume ratio, εoFor air or Dielectric constant in person's vacuum.
- 3. the according to the method described in claim 2, it is characterized in that, εoFor 8.85~15F/M.
- 4. according to the method described in claim 1, it is characterized in that, the S103 is specifically included：Signal after variation is carried out or handled；Will or treated signal in the output waveform that do not transfinite be changed to sinusoidal signal；Signal after change is filtered to obtain equivalent d. c. voltage signal.
- 5. a kind of soil moisture sensor, which is characterized in that the soil moisture sensor includes：Circuit board mounting hole (1), electricity Road mainboard (2), transmitting and reception signal electrode plate (3), cable fixing groove (4), marine glue body case (5), reference electrode plate (6)；The transmitting and the transmitting of reception signal electrode plate (3) receive induction electrode and the ground electrode of the reference electrode plate (6) It is integrated with the circuit main board (2)；The cable fixing groove (4) is located at the circuit main board (2) top, is connected for mainboard external power supply with signal cable.
- 6. soil moisture sensor according to claim 5, which is characterized in that sealed in the marine glue body case (5) Before, fixed cable position, after the hardening of waterproof colloid, circuit board mounting hole (1), connection cables and mainboard described in fixing seal；There is colloid to run through mainboard in circuit board mounting hole (1).
- 7. soil moisture sensor according to claim 5, which is characterized in that the marine glue body case (5) is silica gel, Seal thickness is 11mm；The transmitting and reception signal electrode plate (3) top are tip taper, transmitting and reception signal electrode plate (3) overall length 52mm, thickness 1.8mm, the two poles of the earth spacing between plates are 11mm；The first half of cable fixing groove (4) is fixed with the circuit main board (2) sealing, is formed whole, tail seal and is had Flexibility；Circuit board mounting hole (1) is hole reserved on the circuit main board (2).
- 8. soil moisture sensor according to claim 5, which is characterized in that reference electrode plate (6) top is point Nose cone shape；The circuit main board (2) includes：Cover copper electrode, copper foil, upper and lower plate；The copper electrode that covers is in interlayer；The copper foil is from 2~3mm of tip position；The plate sealed insulation up and down, for preventing interlayer copper foil oxidation corrosion；The needle point is the transmitting and reception signal electrode plate (3) and the tapered edges acies of reference electrode plate (6).
- 9. soil moisture sensor according to claim 5, which is characterized in that the circuit main board (2) includes：By in the of first Chip (2.3), resonant resistance (2.4), signal processing core occur for road capacitance (2.1), the first supply voltage (2.2), high-frequency signal Piece (2.5), the first plates capacitance electrode (2.6), the second plates capacitance electrode (2.7), the second supply voltage (2.8), by second Road capacitance (2.9), the first power supply cathode (2.10), concussion frequency adjustment resistance (2.11), the 3rd supply voltage (2.12), Second power supply cathode (2.13), output signal filter resistance (2.14), output signal filter capacitor (2.15), the 3rd power supply Power cathode (2.16), the 4th power supply cathode (2.17), output signal label (2.18)；Chip (2.3) occurs for the high-frequency signal, and for generating the square wave of fixed frequency and amplitude, core occurs for the high-frequency signal The 4th pin access power supply anode of piece (2.3), divides, and frequency division coefficient is 1 for shaking；The concussion frequency adjustment resistance (2.11), for adjusting the concussion frequency of output, adjustable range is 17~170MHz；First shunt capacitance (2.1), for being filtered to the circuit main board (2) feeder ear；Signal processing chip (2.5) is OR circuit, and the 1st and the 2nd pin of the signal processing chip (2.5) is defeated for its signal Enter end；Second shunt capacitance (2.9), for being filtered to the circuit main board (2) feeder ear, through OR circuit Signal output after, add in by output signal filter resistance (2.14) and output signal filter capacitor (2.15) form RC filtering Circuit, for stablizing the useful signal of output.
- 10. soil moisture sensor according to claim 9, which is characterized in that chip (2.3) occurs for the high-frequency signal The continuous fixed frequency and the square-wave signal of amplitude generated is connected to by the resonant resistance (2.4) and second pole plate electricity Hold the resonance RC circuits that electrode (2.7) forms, exported by the signal processing chip (2.5) amplitude limit, and the output that will not transfinite Waveform is changed to sinusoidal signal, connects the output signal filter resistance (2.14) and the output signal filter capacitor afterwards (2.15) the RC filter circuits of composition；The resonant resistance (2.4) and the second plates capacitance electrode (2.7) composition inductance capacitance, the appearance of the inductance capacitance Be worth, the inductance capacitance related to soil moisture content, for make input to the signal processing chip (2.5) signal amplitude with Cycle generates corresponding variation；Capacitance C=k × ε of the inductance capacitancer×εo；Wherein, k is to fix geometric constant, εrFor the relative dielectric constant that whole soil is mixed according to volume ratio, εoFor air or Dielectric constant in person's vacuum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711337736.8A CN108051485B (en) | 2017-12-14 | 2017-12-14 | Soil moisture measuring method and soil moisture sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711337736.8A CN108051485B (en) | 2017-12-14 | 2017-12-14 | Soil moisture measuring method and soil moisture sensor |
Publications (2)
| Publication Number | Publication Date |
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