CN109001423B - Soil moisture measuring punching and measuring integrated device - Google Patents
Soil moisture measuring punching and measuring integrated device Download PDFInfo
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- CN109001423B CN109001423B CN201810641404.7A CN201810641404A CN109001423B CN 109001423 B CN109001423 B CN 109001423B CN 201810641404 A CN201810641404 A CN 201810641404A CN 109001423 B CN109001423 B CN 109001423B
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- 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
Abstract
The invention relates to a punching and measuring integrated device for soil moisture measurement, which comprises a punching probe (1) and a measuring probe (2), and is characterized in that: the punching probe (1) is of a hollow structure, and the measuring probe (2) is placed in the punching probe (1); after the punching probe (1) finishes punching, the measuring probe (2) is automatically released to measure the soil moisture, and the measuring probe (2) is prevented from independently entering the pre-punching process or being damaged by gravel when entering the pre-punching process.
Description
Technical Field
The invention relates to a method for applying for the Chinese patent application, wherein the application is applied on 2017, 05 and 02, and the application numbers are as follows: 201710298977X entitled "control method of punching and measuring integrated device for soil moisture measurement". The invention relates to a method for researching the response relation of soil moisture change to a hydrological process in a changing environment, belongs to the field of hydrological research methods, and particularly relates to a punching and measuring integrated device for soil moisture measurement.
Background
The section soil moisture measuring system is based on a time domain reflection technology of a section soil moisture sensor and is used for directly measuring the dielectric constant of soil or other media, the dielectric constant is closely related to the content of soil moisture, and the soil moisture content can be calculated and displayed by a reading system through analog voltage output. The technology is the main principle of the current soil moisture determination device, and can continuously, quickly and accurately measure the soil moisture. Meanwhile, the method can also be used for measuring the surface water content of the soil. The equipment response time of the general profile soil moisture measuring system is about 10-20 seconds, the system is suitable for mobile measurement and fixed-point monitoring, and the measurement result is slightly influenced by salinity.
However, when the profile soil moisture measuring system is used for measuring deeper soil moisture, the probe of the profile soil moisture measuring system may be damaged because the matched pre-punching device cannot ensure that the probe of the profile soil moisture measuring system is accurately inserted into the pre-punching hole at one time.
In addition, the existing soil moisture measurement needs to set a plurality of measuring points in the same area to measure the soil moisture data respectively. However, given the limited field operating conditions and the limited number of workers, and the influence of field temperature differences and moisture evaporation, the longer time interval between each measurement point affects the moisture measurement across the field, resulting in data distortion.
In addition, when the existing profile soil moisture measuring system is used, due to the diversity of soil components, the solid gravel is very easy to damage the measuring probe in the downlink process, and the soil moisture measuring instrument is expensive, so that the use cost is high.
See the following chinese patent documents:
1. the invention name is as follows: an improved device for measuring soil moisture; application No.: 200620168653.1, respectively; patentee: shenyang applied ecology research institute of Chinese academy of sciences. This patent includes a hole punch and a soil moisture meter. The soil is punched by a puncher firstly, and then the soil moisture meter is used for measuring. However, there are technical drawbacks in that it is not possible to ensure that the measuring probe of the soil moisture meter is accurately inserted into the pre-drilled hole, and there is a possibility that the measuring probe may be damaged by gravel during the downward movement. Meanwhile, the method does not give technical suggestion of synchronous measurement of a plurality of holes.
2. The invention name is as follows: a pre-perforating device for a profile soil moisture measuring system; application No.: 201610248040.7, respectively; the patent applicant: china institute of Water conservancy and hydropower science. The invention solves the positioning relation between the punching device and the limiting pipe, but cannot ensure that a subsequently placed measuring probe accurately enters a preset hole, and can also cause the damage of a detection system if gravel exists in the downlink. Also, it does not give any technical teaching for simultaneous measurement of multiple holes.
Disclosure of Invention
The invention designs a control method of a punching and measuring integrated device for soil moisture measurement, which solves the technical problems that: (1) when the existing profile soil moisture measuring system is used for measuring the moisture of deeper soil, the matched pre-punching device cannot ensure that the probe of the profile soil moisture measuring system is accurately inserted into the pre-punching hole at one time, so that the probe of the profile soil moisture measuring system can be damaged. (2) When the existing profile soil moisture measuring system is used, due to the diversity of soil components, the solid gravel is very easy to damage a measuring probe in the downlink process, and the soil moisture measuring instrument is very expensive, so that the use cost is high.
In order to solve the technical problems, the invention adopts the following scheme:
a control method of a punching and measuring integrated device for soil moisture measurement comprises the following steps:
step 3, controlling a receiver to start a punching driving motor (14) to rotate forwards, and downwards digging the pre-punched hole by a cone digging part (11) through force transmission;
step 7, controlling the receiver to start the moisture measuring instrument to collect data, and storing the data in the control receiver;
step 8, after data acquisition is finished, lifting the mounting platform (3) through the extension rod (4);
9, the change of the output voltage signal of the pressure sensor on the measuring probe (2) proves that the pressure sensor is separated from the pre-punching;
step 10, controlling a receiver to start a punching driving motor (14) to rotate forwards according to the voltage signal change of the pressure sensor in the step 9, so that the punching probe (1) is restored to the initial state;
and 12, taking out the mounting platform (3) and the punching probe (1) from the limiting pipe (6).
Further, if the depth of the pre-perforation cannot be completed by one time, the steps 3-4 can be repeated.
Further, the control receiver and the punching drive motor (14), the release measuring probe drive motor (45) and the moisture measuring instrument can be controlled through wireless signals.
The utility model provides a punch and measure integrative device for soil moisture is measured, includes punch probe (1) and measuring probe (2), its characterized in that: the punching probe (1) is of a hollow structure, and the measuring probe (2) is placed in the punching probe (1); after the punching probe (1) finishes punching, the measuring probe (2) is automatically released to measure the soil moisture, and the measuring probe (2) is prevented from independently entering the pre-punching process or being damaged by gravel when entering the pre-punching process.
Further, the punching probe (1) comprises a cone digging part (11), a movable connecting part (12), a fixed connecting part (13) and a punching driving motor (14), wherein the output end of the punching driving motor (14) is connected with one end of the fixed connecting part (13), the other end of the fixed connecting part (13) is connected with one end of the movable connecting part (12) through threads, and the movable connecting part (12) stretches under the rotation of the fixed connecting part (13); the other end of the movable connecting part (12) is connected with the cone digging part (11) through a connecting rotating shaft (15); the cone digging part (11) releases or retracts the measuring probe (2) through a cone digging part switch mechanism (4).
Further, a spiral groove (16) facilitating soil output is formed in the surface of the movable connecting portion (12).
Further, the cone digging part opening and closing mechanism (4) comprises a telescopic rod (41), a fixed internal thread pipe (42), an elastic hollow pipe (43) and a release measuring probe driving motor (45), the release measuring probe driving motor (45) is fixed on the inner wall of the movable connecting part (12), the output end of the release measuring probe driving motor (45) is connected with one end of the fixed internal thread pipe (42), the other end of the fixed internal thread pipe (42) is connected with one end of the telescopic rod (41) through threads, and the telescopic rod (41) stretches under the rotation of the fixed internal thread pipe (42); the elastic hollow pipe (43) is fixed on the inner wall of the cone digging part (11), and the other end of the telescopic rod (41) enters the elastic hollow pipe (43) to directly jack the cone digging part (11) or indirectly jack the cone digging part (11) through the elastic hollow pipe (43).
Furthermore, the cone digging part (11) at least comprises two half cones (111), each half cone (111) is provided with an elastic hollow pipe (43), and each half cone (111) is connected with the movable connecting part (12) through a connecting rotating shaft (15).
Further, the opening of the two half cones (111) is realized by one release measuring probe driving motor (45), and the specific structure is as follows: the telescopic rod (41) is connected with a top rod through a connecting circular ring (44), and the measuring probe (2) penetrates through the connecting circular ring (44); the telescopic rod (41) is matched with the elastic hollow tube (43) on one semi-cone (111), and the ejector rod is matched with the other elastic hollow tube (43) on the other semi-cone (111).
Further, a return spring (46) is arranged between each half cone (111) and the movable connecting part (12) and is used for helping the half cones (111) to restore to cone structures after being opened.
Further, still include mounting platform (3), punch driving motor (14) and fix on mounting platform (3), the one end of measuring probe (2) is also installed on mounting platform (3), connects an extension rod (5) above mounting platform (3).
Further, the device also comprises a limiting pipe (6), and the whole pipe body of the limiting pipe is buried in the soil; the inner wall of the limiting pipe (6) is provided with a plurality of limiting sliding blocks (61) along the axial direction, the mounting platform (3) is correspondingly provided with limiting grooves (31) with the same quantity, and the limiting sliding blocks (61) are matched with the limiting grooves (31) to ensure that the position relation between the limiting sliding blocks and the limiting grooves cannot deviate.
Furthermore, the number of the punching probes (1) is two, and the number of the corresponding measuring probes (2) is also two; two punching probes (1) work simultaneously, and two measuring probes (2) work simultaneously.
This be used for soil moisture measuring punch and measure integrative device and have following beneficial effect:
(1) the drilling probe and the measuring probe are combined together, and the measuring probe can be released for measurement after the drilling of the drilling probe is finished, so that the step that the measuring probe needs to enter pre-drilling independently is reduced, the damage of the measuring probe caused by the entering error of the measuring probe is avoided, and the damage of gravel in the pre-drilling to the measuring probe can be avoided.
(2) The invention can realize the automation of punching and measurement, changes the mode of excessive manual contact in the past, and improves the measurement precision and the measurement efficiency.
(3) According to the invention, the punching probe can freely move in the vertical direction through the punching driving motor, so that the measuring probe can contact the soil to be measured without a driving device, the use of equipment is saved, and the manufacturing cost is reduced.
Drawings
FIG. 1: the invention is used for the structure sketch map of the punching and measuring integrated device for measuring soil moisture;
FIG. 2: FIG. 1 is a schematic view of the cone digging portion switch mechanism;
FIG. 3: FIG. 1 is a schematic external view of a perforation probe;
FIG. 4: the invention is used for the punching and measuring integrated device and the limit pipe connection schematic diagram of the soil moisture measurement;
FIG. 5: FIG. 1 is a schematic view of the structure of the digging portion of the cone;
FIG. 6: the invention relates to a control unit connection block schematic diagram of a punching and measuring integrated device for soil moisture measurement.
Description of reference numerals:
1-a punch probe; 11-a cone digging part; 111-half cone; 12-a mobile connection; 13-a fixed connection; 14-a punching driving motor; 15-connecting the rotating shaft; 16-a spiral groove; 2-a measurement probe; 3, mounting a platform; 31-a limiting groove; 4-the switch mechanism of the cone digging part; 41, a telescopic rod; 42, fixing the internal threaded pipe; 43-elastic hollow tube; 44-connecting the circular ring; 45-release the measurement probe drive motor; 46-a return spring; 5, extending rods; 6, a limiting pipe; 61-limiting slide block.
Detailed Description
The invention is further described below with reference to fig. 1 to 6:
as shown in figure 1, the punching and measuring integrated device for soil moisture measurement comprises a punching probe 1 and a measuring probe 2, wherein the punching probe 1 is of a hollow structure, and the measuring probe 2 is placed in the punching probe 1. The number of the punching probes 1 is two, and the number of the corresponding measuring probes 2 is also two; two punch probes 1 are operated simultaneously and two measuring probes 2 are operated simultaneously. After the punching probe 1 finishes punching, the measuring probe 2 is automatically released to measure the soil moisture, and the measuring probe 2 is prevented from independently entering the pre-punching process or being damaged by gravel when entering the pre-punching process.
Specifically, the punch probe 1 includes a cone digging part 11, a movable connecting part 12, a fixed connecting part 13, and a punch driving motor 14, wherein an output end of the punch driving motor 14 is connected to one end of the fixed connecting part 13, the other end of the fixed connecting part 13 is connected to one end of the movable connecting part 12 through a screw, and the movable connecting part 12 extends and contracts when the fixed connecting part 13 rotates. The other end of the movable connecting portion 12 is connected to the excavating cone portion 11 via a connecting shaft 15. The pyramidal excavation portion 11 releases or retracts the measurement probe 2 by the pyramidal excavation portion opening and closing mechanism 4.
The fixed connection part 13 is not fixed, but is fixedly connected with the output end of the punching driving motor 14, under the action of the punching driving motor 14, the fixed connection part 13 rotates and acts on the movable connection part 12 through threads to enable the movable connection part 12 to rotate, and the length of the threaded connection between the movable connection part 12 and the fixed connection part 13 changes in the rotating process of the movable connection part 12, so that the telescopic effect is achieved. Therefore, it is necessary to have one of the movable connecting portion 12 and the fixed connecting portion 13 as a rod structure with threads on the outer surface and the other as a tubular structure with threads on the inner surface. The length of the threads can be determined according to the length of the movable connection part 12.
The working principle is as follows: when the control receiver starts the punching driving motor 14 through an instruction, the punching driving motor 14 rotates forwards to drive the fixed connecting part 13 to rotate forwards, finally, the movable connecting part 12 extends out in a rotating mode, and the cone digging part 11 at the lower end of the movable connecting part 12 starts to punch holes in soil in a rotating mode. After the punching is finished, the control receiver starts the punching driving motor 14 to rotate reversely through instructions, the movable connecting part 12 rotates and retracts, and the cone digging part 11 is also lifted. Similarly, if the punch drive motor 14 is reversed after the pyramidal excavation section 11 is opened, the measurement probe 2 may be exposed to pre-punching.
As shown in fig. 2, the pyramidal excavation section opening/closing mechanism 4 includes an expansion link 41, a fixed internally threaded tube 42, an elastic hollow tube 43, and a release measurement probe driving motor 45, the release measurement probe driving motor 45 is fixed to the inner wall of the movable connecting section 12, an output end of the release measurement probe driving motor 45 is connected to one end of the fixed internally threaded tube 42, the other end of the fixed internally threaded tube 42 is connected to one end of the expansion link 41 by a screw, and the expansion link 41 expands and contracts when the fixed internally threaded tube 42 rotates; the elastic hollow tube 43 is fixed on the inner wall of the cone digging part 11, and the other end of the expansion link 41 enters the elastic hollow tube 43 to directly prop up the cone digging part 11 or indirectly prop up the cone digging part 11 through the elastic hollow tube 43.
The working principle of the fixed internally threaded tube 42 and the telescopic rod 41 refers to the working principle of the movable connecting part 12 and the fixed connecting part 13. The advantage of selecting the elastic hollow tube 43 is: the contact position of the telescopic rod 41 and the semi-cone 111 is prevented from changing when the telescopic rod 41 jacks the semi-cone 111; the elastic hollow tube 43 is prevented from being stuck or worn; smooth opening of the pyramidal excavating part 11 can be ensured.
The digging part 11 is composed of at least two half cones 111, each half cone 111 is provided with an elastic hollow tube 43, and each half cone 111 is connected with the movable connecting part 12 through a connecting rotating shaft 15.
The opening of the two half cones 111 is achieved by a release measuring probe drive motor 45; the concrete structure is as follows: the telescopic rod 41 is connected with a mandril through a connecting circular ring 44, and the measuring probe 2 penetrates through the connecting circular ring 44; the telescopic rod 41 is matched with the elastic hollow tube 43 on one semi-cone 111, and the mandril is matched with the other elastic hollow tube 43 on the other semi-cone 111. The telescopic rod 41 and the ejector rod share one motor for driving, so that the space can be saved, the manufacturing cost can be saved, the telescopic rod 41 and the ejector rod can be ensured to work synchronously all the time, and the two half cones 111 are opened synchronously.
When the cone digging part 11 needs to be closed, the release measuring probe driving motor 45 rotates reversely, each half cone 111 needs to be restored, so a return spring 46 is arranged between each half cone 111 and the movable connecting part 12 to help the half cone 111 to be restored to a cone structure after being opened.
As shown in fig. 3, the surface of the moving connecting portion 12 is provided with a spiral groove 16 for facilitating the output of soil.
As shown in fig. 4, the punching and measuring integrated device for measuring soil moisture further comprises a mounting platform 3, a punching driving motor 14 is fixed on the mounting platform 3, one end of a measuring probe 2 is also mounted on the mounting platform 3, and an extension rod 5 is connected above the mounting platform 3. In addition, the device also comprises a limiting pipe 6, and the whole pipe body of the limiting pipe is buried in the soil; the inner wall of the limiting pipe 6 is provided with a plurality of limiting sliding blocks 61 along the axial direction, the mounting platform 3 is correspondingly provided with limiting grooves 31 with the same quantity, and the limiting sliding blocks 61 and the limiting grooves 31 are matched with each other to ensure that the position relation between the limiting sliding blocks and the limiting grooves 31 cannot deviate.
As shown in fig. 5, the digging portion 11 of the cone is composed of two half cones 111, and the half cones 111 are two structures which are cut into two equal volumes along the height of the cone.
As shown in fig. 6, the control method of the punching and measuring integrated device for soil moisture measurement according to the present invention is as follows:
step 3, controlling a receiver to start a punching driving motor 14 to rotate forwards, and downwards digging the pre-punched hole by a cone digging part 11 through force transmission;
step 7, controlling the receiver to start the moisture measuring instrument to collect data, and storing the data in the control receiver;
step 8, after data acquisition is finished, lifting the mounting platform 3 through the extension rod 4;
9, measuring the change of the output voltage signal of the pressure sensor on the probe 2 to prove that the pressure sensor is separated from the pre-punching;
step 10, controlling the receiver to start the punching driving motor 14 to rotate forwardly according to the voltage signal change of the pressure sensor in the step 9, so that the punching probe 1 is restored to the initial state;
and 12, taking out the mounting platform 3 and the punching probe 1 from the limiting pipe 6.
Further, if the depth of the pre-perforation cannot be completed by one time, the steps 3-4 can be repeated.
Further, the control receiver may be controlled by wireless signals with the punch drive motor 14, the release measurement probe drive motor 45, and the moisture meter.
The invention is described above with reference to the accompanying drawings, it is obvious that the implementation of the invention is not limited in the above manner, and it is within the scope of the invention to adopt various modifications of the inventive method concept and solution, or to apply the inventive concept and solution directly to other applications without modification.
Claims (4)
1. The utility model provides a punch and measure integrative device for soil moisture is measured, includes punch probe (1) and measuring probe (2), its characterized in that: the punching probe (1) is of a hollow structure, and the measuring probe (2) is placed in the punching probe (1); after the punching probe (1) finishes punching, the measuring probe (2) is automatically released to measure the soil moisture, so that the measuring probe (2) is prevented from being damaged by gravels when independently entering the pre-punching or entering the pre-punching; the punching probe (1) comprises a cone digging part (11), a movable connecting part (12), a fixed connecting part (13) and a punching driving motor (14), wherein the output end of the punching driving motor (14) is connected with one end of the fixed connecting part (13), the other end of the fixed connecting part (13) is connected with one end of the movable connecting part (12) through threads, and the movable connecting part (12) stretches under the rotation of the fixed connecting part (13); the other end of the movable connecting part (12) is connected with the cone digging part (11) through a connecting rotating shaft (15); the cone digging part (11) releases or retracts the measuring probe (2) through a cone digging part switch mechanism (4); the cone digging part switching mechanism (4) comprises a telescopic rod (41), a fixed internal threaded pipe (42), an elastic hollow pipe (43) and a release measuring probe driving motor (45), the release measuring probe driving motor (45) is fixed on the inner wall of the movable connecting part (12), the output end of the release measuring probe driving motor (45) is connected with one end of the fixed internal threaded pipe (42), the other end of the fixed internal threaded pipe (42) is connected with one end of the telescopic rod (41) through threads, and the telescopic rod (41) stretches under the rotation of the fixed internal threaded pipe (42); the elastic hollow pipe (43) is fixed on the inner wall of the cone digging part (11), and the other end of the telescopic rod (41) enters the elastic hollow pipe (43) to directly jack the cone digging part (11) or indirectly jack the cone digging part (11) through the elastic hollow pipe (43); the cone digging part (11) at least consists of two half cones (111), each half cone (111) is provided with an elastic hollow pipe (43), and each half cone (111) is connected with the movable connecting part (12) through a connecting rotating shaft (15); the opening of the two half-cones (111) is realized by one release measuring probe driving motor (45); the telescopic rod (41) is connected with a top rod through a connecting circular ring (44), and the measuring probe (2) penetrates through the connecting circular ring (44); the telescopic rod (41) is matched with the elastic hollow tube (43) on one semi-cone (111), and the ejector rod is matched with the other elastic hollow tube (43) on the other semi-cone (111).
2. The integrated punching and measuring device for soil moisture measurement according to claim 1, wherein: a return spring (46) is arranged between each half cone (111) and the movable connecting part (12) and is used for helping the half cones (111) to restore to cone structures after being opened.
3. The integrated punching and measuring device for soil moisture measurement according to claim 1, wherein: the punching machine is characterized by further comprising a mounting platform (3), wherein the punching driving motor (14) is fixed on the mounting platform (3), one end of the measuring probe (2) is also mounted on the mounting platform (3), and an extension rod (5) is connected above the mounting platform (3).
4. The integrated punching and measuring device for soil moisture measurement according to claim 3, wherein: the device also comprises a limiting pipe (6), and the whole pipe body of the limiting pipe is buried in the soil; the inner wall of the limiting pipe (6) is provided with a plurality of limiting sliding blocks (61) along the axial direction, the mounting platform (3) is correspondingly provided with limiting grooves (31) with the same quantity, and the limiting sliding blocks (61) are matched with the limiting grooves (31) to ensure that the position relation between the limiting sliding blocks and the limiting grooves cannot deviate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810641404.7A CN109001423B (en) | 2017-05-02 | 2017-05-02 | Soil moisture measuring punching and measuring integrated device |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710298977.XA CN106980010B (en) | 2017-05-02 | 2017-05-02 | A kind of punching for soil moisture measurement and the control method for measuring integrated device |
| CN201810641404.7A CN109001423B (en) | 2017-05-02 | 2017-05-02 | Soil moisture measuring punching and measuring integrated device |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710298977.XA Division CN106980010B (en) | 2017-05-02 | 2017-05-02 | A kind of punching for soil moisture measurement and the control method for measuring integrated device |
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| Publication Number | Publication Date |
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| CN109001423A CN109001423A (en) | 2018-12-14 |
| CN109001423B true CN109001423B (en) | 2020-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810651732.5A Active CN109001425B (en) | 2017-05-02 | 2017-05-02 | Cone excavation portion switch mechanism |
| CN201810641405.1A Active CN109001424B (en) | 2017-05-02 | 2017-05-02 | Soil moisture measurement probe that punches |
| CN201810641404.7A Active CN109001423B (en) | 2017-05-02 | 2017-05-02 | Soil moisture measuring punching and measuring integrated device |
| CN201810655403.8A Active CN109001427B (en) | 2017-05-02 | 2017-05-02 | Control method of soil moisture measurement punching probe |
| CN201710298977.XA Active CN106980010B (en) | 2017-05-02 | 2017-05-02 | A kind of punching for soil moisture measurement and the control method for measuring integrated device |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810651732.5A Active CN109001425B (en) | 2017-05-02 | 2017-05-02 | Cone excavation portion switch mechanism |
| CN201810641405.1A Active CN109001424B (en) | 2017-05-02 | 2017-05-02 | Soil moisture measurement probe that punches |
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| CN201810655403.8A Active CN109001427B (en) | 2017-05-02 | 2017-05-02 | Control method of soil moisture measurement punching probe |
| CN201710298977.XA Active CN106980010B (en) | 2017-05-02 | 2017-05-02 | A kind of punching for soil moisture measurement and the control method for measuring integrated device |
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| US7569810B1 (en) | 2005-08-30 | 2009-08-04 | Troxler Electronic Laboratories, Inc. | Methods, systems, and computer program products for measuring the density of material |
| CN108845107A (en) * | 2018-06-22 | 2018-11-20 | 德清绿色阳光农业生态有限公司 | A kind of soil testing device of forestry plantation |
| CN112213546A (en) * | 2020-09-02 | 2021-01-12 | 国网内蒙古东部电力有限公司检修分公司 | Grounding electrode micro-current measuring device based on fluxgate current-voltage sensor |
| CN114460262A (en) * | 2020-12-28 | 2022-05-10 | 海南聚能科技创新研究院有限公司 | Portable soil moisture salinity sensor |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN106980010A (en) | 2017-07-25 |
| CN109001425B (en) | 2020-10-02 |
| CN109001427A (en) | 2018-12-14 |
| CN109001425A (en) | 2018-12-14 |
| CN109001423A (en) | 2018-12-14 |
| CN109001424B (en) | 2020-10-02 |
| CN109001427B (en) | 2020-10-02 |
| CN109001424A (en) | 2018-12-14 |
| CN106980010B (en) | 2018-05-29 |
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