CN113866392A - Soil multi-parameter measuring system and measuring method thereof - Google Patents
Soil multi-parameter measuring system and measuring method thereof Download PDFInfo
- Publication number
- CN113866392A CN113866392A CN202111164202.6A CN202111164202A CN113866392A CN 113866392 A CN113866392 A CN 113866392A CN 202111164202 A CN202111164202 A CN 202111164202A CN 113866392 A CN113866392 A CN 113866392A
- Authority
- CN
- China
- Prior art keywords
- electrode
- soil
- measuring
- temperature
- water potential
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002689 soil Substances 0.000 title claims abstract description 190
- 238000000034 method Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 108
- 239000000523 sample Substances 0.000 claims description 47
- 238000005259 measurement Methods 0.000 claims description 36
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 9
- 230000005284 excitation Effects 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 6
- 238000000691 measurement method Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 238000009529 body temperature measurement Methods 0.000 claims description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 8
- 239000011148 porous material Substances 0.000 description 7
- 229910052697 platinum Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 229910018487 Ni—Cr Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920001817 Agar Polymers 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000008272 agar Substances 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 238000001566 impedance spectroscopy Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000002680 soil gas Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 238000004861 thermometry Methods 0.000 description 1
- 239000005439 thermosphere Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
-
- 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
- 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
- G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
- G01N33/246—Earth materials for water content
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Immunology (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Pathology (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention provides a soil multi-parameter measuring system and a measuring method thereof, wherein the system comprises: the device comprises a first electrode, a second electrode, a third electrode, a fourth electrode, a main control module and a switching module; the first electrode and the second electrode form a soil temperature and thermal conductivity measuring electrode which is used for measuring the temperature and the thermal conductivity of the soil sample to be measured; the first electrode, the third electrode and the fourth electrode form a soil moisture water potential measuring electrode which is used for measuring moisture and water potential of the soil sample to be measured; the main control module controls the soil temperature thermal conductivity measuring electrode and the soil water potential measuring electrode; the switching module is used for switching the work of the soil temperature thermal conductivity measuring electrode and the soil water potential measuring electrode. The temperature and the heat conductivity of the soil can be measured through the first electrode and the second electrode, and the moisture and the water potential of the soil can be measured through the first electrode, the third electrode and the fourth electrode; can measure a plurality of parameters of soil simultaneously, solve the problem that the soil parameter has space opposite sex.
Description
Technical Field
The invention relates to the technical field of soil parameter measurement, in particular to a soil multi-parameter measurement system and a measurement method thereof.
Background
The soil is the main material basis for the survival of plants and can provide water, fertilizer, heat and gas necessary for the growth of crops. Soil parameters can be broadly divided into three broad categories, physical, chemical and biological parameters. At present, parameters monitored by agricultural soil sensors mainly comprise temperature, pH, electric conductivity, thermal conductivity, element content, granularity, volume weight, ice content, hydraulic parameters and the like.
The water content of the soil is divided into volume water content and mass water content, and the mass water content of the soil generally refers to the absolute water content of the soil, namely 100g of dried soil contains a plurality of grams of water, which is also called as the water content of the soil. The water content of the soil is measured, so that the water requirement of crops can be mastered, and the method has important guiding significance for agricultural production.
The soil water potential refers to the total potential energy of water contained in soil and is an important index for describing and judging the soil water content and migration. The soil water potential and the water content are closely related, the water absorption capacity of the soil is gradually enhanced along with the reduction of the water content of the soil, and the soil water potential is also gradually reduced.
The water potential in the existing soil can be measured by a tensiometer, a dielectric method and the like, and can also be calculated by a Kerabolon equation. The tensiometer utilizes the pressure difference between the wet argil head and the soil water potential to make the water in the argil head enter the soil until reaching an equilibrium state, thereby obtaining the water potential of the soil to be detected. The principle of measuring the soil water potential by the dielectric method is to calculate the water potential value of the soil according to the water value of the porous material when the porous material and the soil to be measured reach an equilibrium state by utilizing a known water characteristic curve (a relation curve between water and the water potential) of the porous material.
The soil thermal conductivity is used for expressing the strength of the conducted soil heat, and is an important index for describing the soil thermal conductivity. The thermal conductivity of soil is in important connection with the water content of soil, and the dry soil particles take air as a main heat-conducting medium, so the thermal conductivity is low. As the water content of the soil increases, the thermal conductivity of the soil will gradually increase.
In partially frozen soils, liquid water and ice coexist. The ice content of these soils depends on temperature, texture, air content, dissolved solutes and overburden loading, affecting the thermal, mechanical and hydraulic properties of the soil. Therefore, accurate measurement of the amount of ice is of great significance to solve environmental and engineering geoscience problems. Although several methods, such as an ice porosimeter, a gas dilatometer, a dielectric spectroscopy method and a thermo-sphere method, have been tested in the laboratory for directly measuring the ice content, there is still a lack of in situ methods for directly measuring the ice content with reasonable accuracy.
Due to agricultural management and climate effects, the volume weight of arable soil may vary significantly. The volume weight of the soil is the ratio of the dried weight of the soil with a certain volume to the water with the same volume. Generally, the volume weight of the soil after cultivation is the lowest. After this, the soil bulk weight increases as the particles re-settle under the influence of rain, irrigation and traffic. Previous studies have shown that soil volume weight can be changed by more than 40% through an annual cycle of disturbances associated with agricultural activities. Freeze-thaw cycling, contraction-expansion processes, erosion and deposition also change the volume weight and structural arrangement of the surface. Transient volume weights affect surface soil gas transport and hydrothermal processes. Larger errors may occur if the volume weight and related properties (such as total soil porosity) are considered to be constant over time.
However, the prior art uses separate measuring devices to measure these parameters separately, which causes large errors due to space variability, and thus it is necessary to develop a device capable of measuring multiple parameters of soil simultaneously.
Disclosure of Invention
The invention provides a soil multi-parameter measuring system and a soil multi-parameter measuring method, which are used for solving the defect that soil parameters have space anisotropy in the prior art and improving the measuring accuracy.
The invention provides a soil multi-parameter measuring system, comprising: the device comprises a first electrode, a second electrode, a third electrode, a fourth electrode, a main control module and a switching module; the first electrode and the second electrode form a soil temperature and thermal conductivity measuring electrode which is used for measuring the temperature and the thermal conductivity of a soil sample to be measured; the first electrode, the third electrode and the fourth electrode form a soil moisture water potential measuring electrode for measuring moisture and water potential of a soil sample to be measured; the main control module controls the soil temperature thermal conductivity measuring electrode and the soil water potential measuring electrode; the switching module is used for switching the soil temperature thermal conductivity measuring electrode and the soil water potential measuring electrode to work.
According to the soil multi-parameter measuring system provided by the invention, the main control module comprises a temperature thermal conductivity measuring and controlling circuit board and a water potential measuring and controlling circuit board, and the soil temperature thermal conductivity measuring electrode and the soil water potential measuring electrode are respectively controlled.
According to the soil multi-parameter measuring system provided by the invention, the switching module comprises a plurality of relays, and the work of the soil temperature thermal conductivity measuring electrode and the soil moisture water potential measuring electrode is controlled through the on-off of the relays.
According to the soil multi-parameter measuring system provided by the invention, a temperature sensor and a heating wire are arranged in each of the first electrode and the second electrode; when the soil temperature and the thermal conductivity are measured, the first electrode and the second electrode are respectively an excitation electrode and a temperature measurement electrode, and the first electrode is used for providing a linear heat source of heat pulse; and the second electrode is used for detecting the change of the temperature of the soil sample to be detected along with time.
According to the soil multi-parameter measuring system provided by the invention, the distance between the first electrode and the second electrode is fixed, and the first electrode and the second electrode are buried in a soil sample to be measured at any angle.
According to the soil multi-parameter measuring system provided by the invention, a high-frequency moisture sensor probe is arranged in the fourth electrode, and the high-frequency moisture sensor probe and the first electrode form a high-frequency moisture sensor; when the soil moisture is measured, the first electrode is an exciting electrode, the fourth electrode is a measuring electrode, the first electrode provides a high-frequency signal, and the fourth electrode detects the moisture content of the soil sample to be measured according to the time of receiving the signal.
According to the soil multi-parameter measuring system provided by the invention, a dielectric water potential sensor probe is arranged in the third electrode, and the third electrode and the first electrode form a dielectric water potential sensor; when the water potential of the soil is measured, the water potential of the soil sample to be measured is detected by the third electrode after the water potential of the soil sample to be measured and the water potential of the inside of the fourth electrode are balanced.
The invention also provides a soil multi-parameter measuring method, which utilizes the soil multi-parameter measuring system and comprises the following steps:
s1, inserting the first electrode, the second electrode, the third electrode and the fourth electrode into the soil sample to be detected at any angle, and completely covering the probe by the soil sample to be detected;
s2, measuring the soil moisture and water potential by a soil moisture and water potential measuring electrode consisting of the first electrode, the third electrode and the fourth electrode;
s3, measuring the temperature and the thermal conductivity of the soil by using a soil temperature and thermal conductivity measuring electrode consisting of the first electrode and the second electrode;
s4, the system repeats the processes of S2 and S3 in a cycle of not less than 6 minutes.
According to the soil multi-parameter measuring method provided by the invention, the step S2 specifically comprises the following steps: the switching module switches to moisture water potential measuring mode, and moisture water potential measurement control panel control first electrode, fourth electrode begin work and detect the water content of soil, and later moisture water potential measurement control circuit board control third electrode, fourth electrode begin work, waits that the water potential of fourth electrode and the soil sample that awaits measuring on every side reaches the equilibrium after, and the water potential of the soil sample that awaits measuring is measured to the third electrode.
According to the soil multi-parameter measuring method provided by the invention, the step S3 comprises the following steps: the measurement switch is turned on, the switching module is switched to a temperature and thermal conductivity measurement mode, the relay is conducted, and the excitation electrode provides a heat pulse;
the temperature measuring electrode detects the temperature of the soil sample to be measured by taking the time not higher than 0.5s as a period, resistance data is returned to the temperature and heat conductivity measurement control circuit board, the temperature and heat conductivity measurement control circuit board obtains that the duration of the current temperature heat pulse of the soil is 45s-60s, and the subsequent electric appliance is switched off and stops heating;
after heating is stopped, the system enters a cooling mode, the temperature measuring electrode can detect the maximum value and time of temperature rise, and the duration time of the cooling mode is not less than 5 minutes;
and after the cooling mode is finished, based on the maximum temperature rise value and time, the duration of the thermal pulse and the heating power of the excitation electrode, the system automatically calculates the thermal conductivity of the soil sample to be measured according to a preset formula.
According to the soil multi-parameter measuring system provided by the invention, the temperature and the heat conductivity of soil can be measured through the first electrode and the second electrode, and the moisture and the water potential of the soil can be measured through the first electrode, the third electrode and the fourth electrode; can measure a plurality of parameters of soil simultaneously, solve the problem that the soil parameter has space opposite sex.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a soil multi-parameter measurement system provided by the present invention;
FIG. 2 is a schematic structural diagram of a third electrode and a fourth electrode provided by the present invention;
FIG. 3 is a switching module layout provided by the present invention;
FIG. 4 is a flow chart of a soil multi-parameter measurement method provided by the present invention;
reference numerals:
1: a first electrode; 2: a second electrode; 3: a third electrode;
4: a fourth electrode; 5: and a main control module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a soil multi-parameter measuring device, including: a first electrode 1, a second electrode 2, a third electrode 3, a fourth electrode 4;
the first electrode 1 and the second electrode 2 form a soil temperature and thermal conductivity measuring electrode which is used for measuring the temperature and the thermal conductivity of a soil sample to be measured;
the first electrode 1, the third electrode 3 and the fourth electrode 4 form a soil moisture water potential measuring electrode for measuring moisture and water potential of a soil sample to be measured.
The main control module 5 comprises a temperature thermal conductivity measurement control circuit board and a water potential measurement control circuit board, and respectively controls the soil temperature thermal conductivity measurement electrode and the soil water potential measurement electrode.
The switching module comprises a plurality of relays, and the work of the soil temperature thermal conductivity measuring electrode and the soil moisture water potential measuring electrode is controlled through the on-off of the relays. As shown in fig. 3, which is a design diagram of the switching module in the embodiment of the present invention, the switching of the soil temperature thermal conductivity measurement electrode and the soil moisture water potential measurement electrode is realized through the relays k1, k2, k3, and k 4.
In a specific working process, the soil multi-parameter measuring system is completely inserted into a soil sample to be measured, a power supply is turned on, the system is automatically powered on and reset, the on-off control of a relay inside the switching module is used for controlling the soil water potential measuring electrode and the soil temperature thermal conductivity measuring electrode to be connected into circuits at different time, and the water potential and the temperature thermal conductivity are measured in sequence.
On the basis of the above embodiments, the thermal conductivity measurement electrode in the present embodiment performs thermal conductivity measurement by using a thermal pulse method. The temperature and thermal conductivity measuring electrode is composed of a temperature sensor, a nickel-chromium heating wire and a corresponding control circuit board, and is packaged inside the stainless steel electrode by using an epoxy resin material, wherein the temperature sensor can select a PT100 platinum resistor. The implementation of the assay requires two identical electrodes as described above, wherein the first electrode 1 is the excitation electrode and the second electrode 2 is the thermometry electrode. The exciting electrode is mainly used as a linear heat source to provide heat pulses (45s-60s) for a certain time, and the temperature measuring electrode is used for measuring the real-time change of the soil temperature and returning to the temperature and thermal conductivity measuring control circuit board for processing and calculation to obtain the temperature and thermal conductivity of the soil sample to be measured.
Specifically, the PT100 platinum resistor adopted in the embodiment is a three-wire PT100 platinum resistor, the temperature measuring range is-50-200 ℃, the measuring precision is 0.02 ℃, and the lead is subjected to silver plating treatment, so that the external electromagnetic field interference can be well shielded. The Ni-Cr heating wire is made of Cr20Ni80, has a diameter of 0.2mm, a length of 16cm and a resistance per unit length of 34.7 omega/m (20 ℃). In order to reduce the influence of the electrode distance on the measurement result as much as possible, the heating wire and the PT100 platinum resistor should be kept in the middle of the electrode when the electrode is packaged. Before use, 5% agar solution is used for calibrating the distance between the exciting electrode and the temperature measuring electrode.
Furthermore, the temperature and thermal conductivity measurement control circuit board is positioned in the packaging shell, the packaging shell is made of PVC, and the influence of external environments such as soil on the circuit work can be reduced. The temperature measurement electrodes obtain temperature and thermal conductivity data and transmit the data back to the temperature and thermal conductivity measurement control circuit board, the microprocessor on the temperature and thermal conductivity measurement control circuit board controls the duration of the thermal pulse through the relay and cools the thermal pulse for at least 5 minutes after the thermal pulse stops, the microprocessor sequentially records the temperature of the soil from the generation of the thermal pulse, the time of the peak temperature and the maximum temperature rise, and the thermal conductivity of the soil is calculated through the following formula.
E/t＝λA(θ2-θ1)/ι
Where E is the energy delivered over time t, A is the cross-sectional area, iota is the length, and θ 2 and θ 1 are the temperatures of the two cross-sections, respectively.
As shown in fig. 2, in addition to the above embodiments, the water potential measuring device in the present embodiment measures the water potential of water by using a conventional dielectric water potential sensor and a conventional high-frequency water sensor, and specifically includes a first electrode 1, a third electrode 3, and a fourth electrode 4. The third electrode 3 is of a coaxial porous structure, moisture in the soil sample to be detected is subjected to moisture exchange with the porous material in the probe through the holes in the probe, and after the moisture exchange is balanced, the moisture and the water potential of the porous material in the third electrode 3 are equal to those of the soil sample to be detected outside. The water-water potential relation curve of the porous material represents the corresponding relation between water and water potential, and can be known in advance according to the type of the porous material. Other dielectric water potential sensors may also be used in the measurement methods provided in this example.
On the basis of the embodiment, when the diameter of the probe of the dielectric water potential sensor is smaller, the balance time is shorter at a certain fixed temperature, and the improvement of the measurement efficiency is facilitated.
As shown in fig. 4, on the basis of the foregoing embodiments, an embodiment of the present invention further provides a soil multi-parameter measuring method, where the soil multi-parameter measuring apparatus according to the foregoing embodiments specifically includes:
s1, inserting the first electrode 1, the second electrode 2, the third electrode 3 and the fourth electrode 4 into the soil sample to be detected at any angle, and requiring the probe to be completely covered by the soil sample to be detected;
s2, measuring the water content and the water potential of the soil by the water content and water potential composite measuring electrode;
s3, measuring the temperature and the thermal conductivity of the soil by the temperature and thermal conductivity composite measuring electrode;
s4, the system repeats the processes of S2 and S3 in a cycle of not less than 6 minutes.
Wherein, the S2 specifically includes:
the switching module switches to the moisture water potential measuring mode, and moisture water potential measurement control circuit board control first electrode, fourth electrode begin work and detect the water content of soil, and later moisture water potential control circuit board control third electrode, fourth electrode begin work, treat with the soil around reach the equilibrium after, measure the water potential of soil.
Further, step S3 specifically includes:
a measurement switch is turned on, the conversion module is switched to a soil temperature and thermal conductivity measurement mode, the relay is conducted, and the excitation electrode provides a thermal pulse;
the temperature measuring electrode detects the temperature of the soil sample to be measured by taking the time not higher than 0.5s as a period, and returns the resistance value data to the temperature and heat conductivity control circuit board, and the temperature and heat conductivity control circuit board obtains the current temperature of the soil;
after the heat pulse duration is 45-60 s, the electric appliance is disconnected, and heating is stopped;
after heating is stopped, the system enters a cooling mode, the temperature measuring electrode can detect the maximum value and time of temperature rise, and the duration time of the cooling mode is not less than 5 minutes;
after the cooling mode is finished, the system can automatically calculate the thermal conductivity of the soil sample to be measured based on the maximum temperature rise value, the maximum time, the duration of the thermal pulse and the heating power of the excitation electrode.
The specific implementation process of the embodiment of the method is the same as that of the embodiment of the apparatus described above, and please refer to the embodiment of the apparatus for details, which is not described herein again.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A soil multi-parameter measurement system, comprising: the device comprises a first electrode, a second electrode, a third electrode, a fourth electrode, a main control module and a switching module;
the first electrode and the second electrode form a soil temperature and thermal conductivity measuring electrode which is used for measuring the temperature and the thermal conductivity of a soil sample to be measured;
the first electrode, the third electrode and the fourth electrode form a soil moisture water potential measuring electrode for measuring moisture and water potential of a soil sample to be measured;
the main control module controls the soil temperature thermal conductivity measuring electrode and the soil water potential measuring electrode;
the switching module is used for switching the soil temperature thermal conductivity measuring electrode and the soil water potential measuring electrode to work.
2. The soil multiparameter measuring system according to claim 1, wherein the main control module comprises a temperature thermal conductivity measurement control circuit board and a water potential measurement control circuit board, which respectively control the soil temperature thermal conductivity measurement electrode and the soil water potential measurement electrode.
3. The soil multiparameter measuring system according to claim 1, wherein the switching module comprises a plurality of relays, and the operation of the soil temperature thermal conductivity measuring electrode and the soil moisture water potential measuring electrode is switched by on-off control of the relays.
4. The soil multi-parameter measurement system of claim 1, wherein a temperature sensor and a heating wire are disposed within each of the first electrode and the second electrode; when the soil temperature and the thermal conductivity are measured, the first electrode and the second electrode are respectively an excitation electrode and a temperature measurement electrode, and the first electrode is used for providing a linear heat source of heat pulse; and the second electrode is used for detecting the change of the temperature of the soil sample to be detected along with time.
5. The soil multiparameter measuring system of claim 4, wherein the first electrode and the second electrode are fixed in distance from each other and are buried in a soil sample to be measured.
6. The soil multi-parameter measuring system according to claim 1, wherein a high-frequency moisture sensor probe is arranged on the fourth electrode, and forms a high-frequency moisture sensor together with the first electrode; when soil moisture is measured, the first electrode and the fourth electrode are respectively an exciting electrode and a measuring electrode, the first electrode provides a high-frequency signal, and the fourth electrode detects the moisture content of the soil sample to be measured according to the time of receiving the signal.
7. The soil multiparameter measuring system according to claim 6, wherein the third electrode is of a coaxial porous structure, is arranged inside the fourth electrode, is internally provided with a dielectric water potential sensor probe, and forms a dielectric water potential sensor together with the first electrode; when the water potential of the soil is measured, the water potential of the soil sample to be measured is detected by the third electrode after the water potential of the soil sample to be measured and the water potential of the inside of the fourth electrode are balanced.
8. A soil multi-parameter measuring method using the soil multi-parameter measuring system according to any one of claims 1 to 7, comprising the steps of:
s1, inserting the first electrode, the second electrode, the third electrode and the fourth electrode into the soil sample to be detected at any angle, and requiring the probe to be completely covered by the soil sample to be detected;
s2, measuring the water content and the water potential of the soil by the soil water potential measuring electrode;
s3, measuring the temperature and the thermal conductivity of the soil by the soil temperature and thermal conductivity measuring electrode;
s4, the system repeats the processes of S2 and S3 in a cycle of not less than 6 minutes.
9. The soil multi-parameter measurement method according to claim 8, wherein the step S2 specifically comprises:
the switching module switches to moisture water potential measuring mode, and moisture water potential measuring control panel control first electrode, fourth electrode begin work and detect the water content of soil, and later moisture water potential measuring control panel control third electrode, fourth electrode begin work, waits that the water potential in fourth electrode and the soil sample that awaits measuring on every side reaches the equilibrium after, and the water potential of the soil sample that awaits measuring is measured to the third electrode.
10. The soil multi-parameter measurement method according to claim 8, wherein the step S3 specifically comprises:
the measurement switch is turned on, the switching module is switched to a temperature and thermal conductivity measurement mode, the relay is conducted, and the excitation electrode provides a heat pulse;
the temperature measuring electrode detects the temperature of the soil sample to be measured by taking the time not higher than 0.5s as a period, resistance data is returned to the temperature and heat conductivity measurement control circuit board, the temperature and heat conductivity measurement control circuit board obtains the current soil temperature heat pulse duration of 45s-60s, and then the electric appliance is disconnected and stops heating;
after heating is stopped, the system enters a cooling mode, the temperature measuring electrode can detect the maximum value and time of temperature rise, and the duration time of the cooling mode is not less than 5 minutes;
and after the cooling mode is finished, based on the maximum temperature rise value and time, the duration of the thermal pulse and the heating power of the excitation electrode, the system automatically calculates the thermal conductivity of the soil sample to be measured according to a preset formula.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111164202.6A CN113866392A (en) | 2021-09-30 | 2021-09-30 | Soil multi-parameter measuring system and measuring method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111164202.6A CN113866392A (en) | 2021-09-30 | 2021-09-30 | Soil multi-parameter measuring system and measuring method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113866392A true CN113866392A (en) | 2021-12-31 |
Family
ID=79001410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111164202.6A Pending CN113866392A (en) | 2021-09-30 | 2021-09-30 | Soil multi-parameter measuring system and measuring method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113866392A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117191894A (en) * | 2023-11-06 | 2023-12-08 | 湖南省交通规划勘察设计院有限公司 | Soil physical property testing system and method based on thermal response and storage medium |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101013097A (en) * | 2007-02-14 | 2007-08-08 | 中国科学院南京土壤研究所 | Original position soil salt content sensing transducer |
| CN101647336A (en) * | 2009-08-28 | 2010-02-17 | 中国科学院南京土壤研究所 | Topsoil salt-control method of planting salt-tolerant plant in mudflat kaline soil |
| CN102262183A (en) * | 2011-06-14 | 2011-11-30 | 中国科学院合肥物质科学研究院 | Multi-configurational detector for detecting conductivity of soil based on current-voltage four-terminal method |
| CN202974929U (en) * | 2012-12-07 | 2013-06-05 | 西安元智系统技术有限责任公司 | Wireless-sensor-network-based multi-parameter monitoring device for vertical gradient of soil |
| CN110988038A (en) * | 2019-12-12 | 2020-04-10 | 中国农业大学 | Soil moisture characteristic line measuring device and measuring method thereof |
| CN111562284A (en) * | 2020-06-28 | 2020-08-21 | 西北农林科技大学 | System and method for measuring soil thermal characteristics and water characteristics |
| AU2020102910A4 (en) * | 2020-10-21 | 2020-12-24 | Northwest Agriculture And Forestry University | A measuring instrument for soil thermal conductivity profile characteristics |
-
2021
- 2021-09-30 CN CN202111164202.6A patent/CN113866392A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101013097A (en) * | 2007-02-14 | 2007-08-08 | 中国科学院南京土壤研究所 | Original position soil salt content sensing transducer |
| CN101647336A (en) * | 2009-08-28 | 2010-02-17 | 中国科学院南京土壤研究所 | Topsoil salt-control method of planting salt-tolerant plant in mudflat kaline soil |
| CN102262183A (en) * | 2011-06-14 | 2011-11-30 | 中国科学院合肥物质科学研究院 | Multi-configurational detector for detecting conductivity of soil based on current-voltage four-terminal method |
| CN202974929U (en) * | 2012-12-07 | 2013-06-05 | 西安元智系统技术有限责任公司 | Wireless-sensor-network-based multi-parameter monitoring device for vertical gradient of soil |
| CN110988038A (en) * | 2019-12-12 | 2020-04-10 | 中国农业大学 | Soil moisture characteristic line measuring device and measuring method thereof |
| CN111562284A (en) * | 2020-06-28 | 2020-08-21 | 西北农林科技大学 | System and method for measuring soil thermal characteristics and water characteristics |
| AU2020102910A4 (en) * | 2020-10-21 | 2020-12-24 | Northwest Agriculture And Forestry University | A measuring instrument for soil thermal conductivity profile characteristics |
Non-Patent Citations (2)
| Title |
|---|
| CHAO CHEN ET AL.: "A Novel Frequency Domain Impedance Sensor with a Perforated Cylinder Coaxial Design for In-Situ Measuring Soil Matric Potential", 《SENSORS》 * |
| SONG YU ET AL.: "In-situ determination of soil water retention curves in heterogeneous soil profiles with a novel dielectric tube sensor for measuring soil matric potential and water content", 《JOURNAL OF HYDROLOGY》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117191894A (en) * | 2023-11-06 | 2023-12-08 | 湖南省交通规划勘察设计院有限公司 | Soil physical property testing system and method based on thermal response and storage medium |
| CN117191894B (en) * | 2023-11-06 | 2024-02-23 | 湖南省交通规划勘察设计院有限公司 | Soil physical property testing system and method based on thermal response and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Yu et al. | Review of research progress on soil moisture sensor technology | |
| Mat et al. | IoT in precision agriculture applications using wireless moisture sensor network | |
| Kumar et al. | Monitoring moisture of soil using low cost homemade Soil moisture sensor and Arduino UNO | |
| CN100419420C (en) | Method and sensor for synchronous real time measuring water content and conductivity of soil | |
| CN101782542B (en) | System and method for testing moisture and temperature of soil mass by heat pulse method | |
| CN102997964B (en) | Soil multiparameter sensing measurement system | |
| Abdelfattah et al. | Calibration of soil humidity sensors of automatic irrigation controller | |
| CN202676649U (en) | Capacitive sensor for synchronous real-time self-compensation measurement of soil moisture content | |
| Nishimura et al. | A compact hardware design of a sensor module for hydroponics | |
| Anire et al. | Environmental wireless sensor network using raspberry Pi 3 for greenhouse monitoring system | |
| CN113866392A (en) | Soil multi-parameter measuring system and measuring method thereof | |
| CN105277589B (en) | Based on the elevated Crop water deficits detection means of thermocouple monitoring temperture of leaves and its detection method | |
| CN113008935A (en) | In-situ measuring device and method for water content, thermal characteristics and electric conductivity of soil | |
| Codreanu et al. | Solar powered wireless multi-sensor device for an irrigation system | |
| WO2009084971A1 (en) | System for measuring soil properties | |
| CN105842306B (en) | A kind of water content measuring device and measuring method | |
| CN110988038B (en) | Soil moisture characteristic line measuring device and measuring method thereof | |
| Nandurkar et al. | Design of a soil moisture sensing unit for smart irrigation application | |
| CN103439276B (en) | A kind of measuring method of soil water content and sensor | |
| Caya et al. | Capacitance-based soil moisture sensor for irrigation scheduling application | |
| CN205607913U (en) | Water content measuring device | |
| CN102100168A (en) | Monopolar plate type automatic soil humidity controller | |
| Dias et al. | Proposal of a novel heat dissipation soil moisture sensor | |
| Wongmeekaew et al. | Wireless sensor network for monitoring of water quality for pond tilapia | |
| CN208848100U (en) | The temperature regulating device measured for SAW resonance, anti-resonance frequency |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211231 |
|
| RJ01 | Rejection of invention patent application after publication |