CN108709917A - Tubular type TDR soil moisture sensors - Google Patents
Tubular type TDR soil moisture sensors Download PDFInfo
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- CN108709917A CN108709917A CN201810454706.3A CN201810454706A CN108709917A CN 108709917 A CN108709917 A CN 108709917A CN 201810454706 A CN201810454706 A CN 201810454706A CN 108709917 A CN108709917 A CN 108709917A
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- 239000002689 soil Substances 0.000 title claims abstract description 69
- 239000000523 sample Substances 0.000 claims abstract description 101
- 238000007789 sealing Methods 0.000 claims abstract description 50
- 238000006243 chemical reaction Methods 0.000 claims abstract description 26
- 239000002184 metal Substances 0.000 claims description 33
- 229910052751 metal Inorganic materials 0.000 claims description 33
- 238000009434 installation Methods 0.000 claims description 24
- 229910001220 stainless steel Inorganic materials 0.000 claims description 21
- 239000010935 stainless steel Substances 0.000 claims description 20
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 9
- 238000003780 insertion Methods 0.000 claims description 7
- 230000037431 insertion Effects 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims 1
- 229910052737 gold Inorganic materials 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000013461 design Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 239000004020 conductor Substances 0.000 description 4
- 208000004141 microcephaly Diseases 0.000 description 4
- 239000004677 Nylon Substances 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 229920001778 nylon Polymers 0.000 description 3
- 238000002310 reflectometry Methods 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241001269238 Data Species 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000643 oven drying Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- 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
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Abstract
The invention discloses a kind of tubular type TDR soil moisture sensors, include from top to bottom top closure, interface module, several ring-shaped probe modules, bottom cover, further include several nonmetallic sealing nut modules and several blank pipe modules, interface module one end is connect with top closure, the other end is connect by sealing nut module with a blank pipe module one end, the blank pipe module other end is connected by sealing nut module with a ring-shaped probe module, and bottom ring-shaped probe module is connect by external screw thread with bottom cover；It is attached by sealing nut module between adjacent two ring-shaped probes module, ring-shaped probe module is connect by sealing nut module with blank pipe module；Ring-shaped probe inside modules SMA conversion sockets are connect by connecting line with SMA conversion sockets in interface module.The present invention can detect soil profile multi-layer Soil moisture value simultaneously, and site operation is convenient and efficient, using flexible.
Description
Technical field
The invention belongs to hydrographic data recording device technical fields, are related to soil moisture sensor, more specifically, are
It is related to a kind of tubular type TDR soil moisture sensors that can detect soil profile different soil depth moisture simultaneously.
Background technology
Soil moisture measurement common technology has artificial oven drying method, Method of Dielectric Coefficient, NEUTRON METHOD etc., is mainly adopted in engineering project
With the frequency domain method FDR or time domain method TDR etc. in Method of Dielectric Coefficient.Currently, the probe structure form of time domain method TDR sensors is whole
It is staight needle form, the quantity of staight needle has 2 needles, 3 needles and spininess form, when measuring the soil moisture of soil profile different depth,
Excavation pit is needed, the staight needle of staight needle sensor is horizontally inserted into soil profile different soils depth level, considers manual operation
Space, the excavation size of foundation pit is larger, and the workload of digging in-situ is larger, increases the difficulty of construction, and soil disturbance also compares
It is larger.Engineering practice is learnt, it is desirable to the embedded soil excavated volume of spot sensor wants small, is preferably adapted to drilling and buries, and one
Soil disturbance is reduced, two improve in-site installation efficiency；It is further desirable that sensor has while measuring different soil depth water
The ability divided, convenient for monitoring Soil Moisture Distribution.But existing TDR sensors still cannot be satisfied the above demand.
Invention content
To solve the above problems, the invention discloses a kind of tubular type TDR soil moisture sensors, it is embedded to be applicable to drilling
Installation, facilitates site operation；Also multi-layer Soil depth moisture, actual monitoring soil water movement rule can be monitored simultaneously.
In order to achieve the above object, the present invention provides the following technical solutions：
Tubular type TDR soil moisture sensors, from top to bottom include top closure, interface module, several ring-shaped probe modules,
Bottom cover, further includes several nonmetallic sealing nut modules and several blank pipe modules, and described interface module one end is sealed with top
Lid connection, the other end are connect by sealing nut module with a blank pipe module one end, and the blank pipe module other end passes through sealing
Nut module is connected with a ring-shaped probe module, and bottom ring-shaped probe module is connect by external screw thread with bottom cover；
It is attached by sealing nut module between adjacent two ring-shaped probes module
Or
, ring-shaped probe module connect by sealing nut module with blank pipe module；
The interface module includes nonmetallic installing pipe and several SMA conversion sockets being arranged inside installing pipe；
The blank pipe module includes the nonmetallic installing pipe of interior sky；
The ring-shaped probe module includes nonmetallic installing pipe, ring-shaped probe component and is arranged inside installing pipe
SMA conversion sockets；The ring-shaped probe component includes three metal ring probes being equably sleeved on outside installing pipe, a metal
Positioning insertion pin, two metal fitting nails, metal installation pedestal and insulated ring, wherein metal installation pedestal are arranged in installing pipe
Portion；There is circular hole, metal positioning insertion pin to pass through through-hole, installing pipe side wall, metal on intermediate probe for metal ring probe one end
It is connected to SMA conversion sockets after installation pedestal and has with SMA conversion sockets and is electrically connected, the insulated ring setting is positioned in metal
Contact pin and metal installation pedestal contact portion realize the insulation of contact pin and pedestal, and metal fitting nail is for both sides probe to be fixed on
In metal installation pedestal；The SMA conversion sockets of ring-shaped probe inside modules pass through the SMA conversion plugs in connecting line and interface module
Seat connection.
Further, the SMA conversion sockets of ring-shaped probe inside modules are converted by the SMA in connecting line and interface module
Socket connects one to one.
Further, the interface module both ends all have external screw thread, and the blank pipe module and ring-shaped probe module are
There is external screw thread, smaller one end outer diameter to match with larger one end internal diameter for larger one end, and capping has and interface module
The internal thread to match with ring-shaped probe module external screw thread, sealing nut module has to be visited with interface module, blank pipe module, annular
The internal thread that pin module external screw thread matches.
Further, the blank pipe module and the larger one end of ring-shaped probe module are provided with boss.
Further, the boss is two, is symmetrical arranged.
Further, the connecting line is coaxial cable.
Further, positioning pin passes through the circular hole on the through-hole and nonmetallic installing pipe on metal ring probe to stretch into pipe
In metal installation pedestal, and fixed by nut.
Further, nonmetallic materials PVC.
Further, metal material is stainless steel.
Compared with prior art, the invention has the advantages that and advantageous effect：
1. the present invention can directly bury in the soil, soil profile multi-layer Soil moisture value can be detected simultaneously, per Layer Detection
Depth is 10 cm layer of soil, monitors soil water movement rule on-line, and for flood-control and drought relief, meteorological data, monitoring provides skill automatically
Art supports, and site operation is convenient and efficient, improves installation effectiveness.
2, the present invention is designed using full non-metal shell, is minimized to the electromagnetic signal transmitted in ring-shaped probe
Interference promotes sensitivity and the precision of ring-shaped probe detection soil moisture, considers that sensor will be embedded in underground, Quan Feijin for a long time
Waterproof, antirust, anti-corrosion, significant increase sensor service life can be solved the problems, such as well by belonging to housing design.
3. it is of the invention whole using Modular assembled design, the die sinking expense of large mold can be reduced, module is passed through
Assembling splicing, facilitate production and processing and the on-demand customization of product, reduce product cost to greatest extent, improve product competitiveness and
Flexibility.
4. present invention can apply in the projects such as flood-control and drought relief, the hydrology, meteorology, geotechnical engineering to the online prison of soil moisture
It surveys, promotes China's soil moisture automatic Weather Station monitoring technology level, market application prospect is wide.
Description of the drawings
Fig. 1 is tubular type TDR soil moisture sensor overall structure diagrams provided by the invention.
Fig. 2 is ring-shaped probe module side view.
Fig. 3 is ring-shaped probe module sectional view.
Reference sign：
1- seals cover module, 2- interface modules, 3- sealing nut modules, 4- blank pipe modules, 5- ring-shaped probe modules, 6- peaces
Tubulature, 7- ring-shaped probes, 8- positioning insertion pins, 9- installation pedestals, 10- nylon insulated rings, 11- notches, 12- boss, 13-SMA turn
Insert seat, 14- coaxial cable jumpers.
Specific implementation mode
Technical solution provided by the invention is described in detail below with reference to specific embodiment, it should be understood that following specific
Embodiment is only illustrative of the invention and is not intended to limit the scope of the invention.
As shown in Figure 1, tubular type TDR soil moisture sensors provided by the invention are designed using Modular assembled, it is each
Component composition includes two PVC sealings cover modules 1, interface module 2, several PVC sealing nuts modules 3, several PVC blank pipes modules
4, several ring-shaped probe modules 5.In Fig. 1, using three ring-shaped probe modules 5, and coordinate two blank pipe modules by ring-shaped probe
Module navigates to the depth for needing to monitor.There are PVC sealings cover module 1, interface module 2, PVC close respectively from top to bottom in Fig. 1
Seal nut module 3, PVC blank pipes module 4, PVC sealing nuts module 3, ring-shaped probe module 5, PVC sealing nuts module 3, ring
Shape probe module 5, PVC sealing nuts module 3, PVC blank pipes module 4, PVC sealing nuts module 3, ring-shaped probe module 5, PVC
Seal cover module 1.
PVC sealings cover module includes PVC short tubes and the rubber seal in short tube interface is arranged, and is arranged on sensor top
The PVC sealings cover module at end is connect by internal thread with interface module.
Interface module includes PVC installing pipes and several SMA conversion sockets for being arranged inside PVC installing pipes, and each SMA turns
It inserts seat to connect with a ring-shaped probe module by 50 Ω coaxial cable jumpers, therefore the quantity of SMA conversion sockets and annular
Probe module quantity is identical.There are three ring-shaped probe modules in this example, therefore the quantity of SMA conversion sockets is also in interface module
Three, connection-peg is exposed to outside interface module tube wall, is exported convenient for data.The screw thread of PVC installations tube end is logical in interface module
Sealing nut is crossed to connect with other components.
PVC sealing nut modules include rubber seal, are realized by the rubber ring at both ends for connecting adjacent block
Sealing.
PVC blank pipe modules are one section of PVC blank pipe, long for replacing ring-shaped probe module position or extension tubular type sensor
Degree, end has screw thread to be connect with adjacent component.
Ring-shaped probe module includes PVC installing pipes 6, stainless steel annular probe assembly and is arranged inside PVC installing pipes
SMA conversion sockets 13 etc., soil moisture is detected by ring-shaped probe.Ring-shaped probe module is to detect the core of soil moisture
Component, the moisture of each detectable 10 cm thick soil of ring-shaped probe module, by the screw thread of end, sealing nut realize with
The connection of adjacent annular probe module or PVC blank pipes.
Specifically, as shown in Figure 2 and Figure 3, stainless steel annular probe assembly includes three stainless steels in ring-shaped probe module
Ring-shaped probe 7, one stainless steel positioning insertion pin 8, two stainless steel positioning pin, stainless steel installation pedestal 9, nylon insulated ring 10.
As shown in Fig. 2, three stainless steel ring-shaped probes are equably sleeved on outside PVC installing pipes, be equipped in pipe stainless steel installation pedestal,
The components such as SMA conversion sockets and 50 Ω coaxial cable lines.It is substantially fully wrapped around by soil around ring-shaped probe, in ring-shaped probe
Side is that (PVC dielectric constants are 2.89 to advanced low-k materials, 1) dielectric constant of air is that this structure design ensure that ring
The measuring accuracy of shape probe.Probe is designed using circular ring shape, and probe interior diameter is identical as PVC installing pipe overall diameters, ensures annular
Probe and PVC protecting tube exact contacts, ring-shaped probe have a notch 11 (notch radian is about 30 ° -80 °), are conducive to signal
It is accurate to capture, and effectively avoid signal interference.Ring-shaped probe uses the parallel installation form of 3 needles, and ring needle uses stainless steel material, interior
Diameter is adapted with installation pipe outside diameter, and Zhou Changwei 150mm, ring needle spacing is 25mm, these structure size design datas can be reduced
It is interfered between electric signal, improves measurement accuracy.Through-hole is all had on each stainless steel ring-shaped probe, is also had therewith in PVC installing pipes
Corresponding three through-holes, stainless steel positioning insertion pin one end are placed through through-hole and PVC on intermediate stainless steel ring-shaped probe
Through-hole in installing pipe stretches into the stainless steel installation pedestal in PVC installing pipes, and is installed by nylon insulated ring and stainless steel
Pedestal realizes that insulation, the male portion are connect with the core wire copper pipe conductor inside SMA conversion sockets, realizes the biography of electromagnetic signal
It is defeated.Two positioning pins are each passed through on the end circular hole and PVC installing pipes in the stainless steel ring-shaped probe on intermediate annular probe both sides
Circular hole stretch into pipe in stainless steel installation pedestal, and fixed by nut, two probes are fixed on installation by stainless steel positioning pin
Guan Shang.Stainless steel installation pedestal is connected to by intermediate threaded hole with the shell of SMA conversion sockets, is realized and 50 Ω coaxial cables
The connection of shielded layer, the SMA conversion sockets in ring-shaped probe module pass through 50 Ω coaxial cable jumpers 14 in interface module
SMA conversion sockets connect, and realize the electric signal output of detection soil moisture, and being connected to TDR finally by 50 Ω coaxial cables surveys
Host is tried, realizes the on-line measurement of soil moisture.
Each ring-shaped probe can test the soil moisture of 10 cm layer of soil, the number of plies can be detected according to soil, flexibly assembly ring
Shape probe module, the soil thickness that need not be monitored are filled with PVC blank pipe modules, can choose multiple PVC blank pipes moulds as needed
Block is sequentially connected in series to avoid longer a distance without monitoring soil layer.
Ring-shaped probe module is preferably identical as PVC blank pipe block lengths, is 10cm, both ends mounting structure is also identical, adopts
With concentric reducer structure design as shown in Figure 3, enlarged head, which sets up separately, to be equipped with special spanner and tightens boss 12, and boss is two, symmetrically
Setting, cooperation special spanner use.PVC sealing nuts and PVC sealing covers are locked with special spanner simultaneously, people can be prevented on foot
Hand can open sensor, realize the reliability of sensor outdoor installation.Major part has external screw thread, and when splicing, microcephaly inserts part
Enter inside the major part of adjacent elements, two pieces connects PVC sealing nuts module (including rubber seal), PVC sealing nut modules
Internal rubber seal is squeezed, in fact by rotating PVC sealing nuts with the internal thread adapted to aforementioned enlarged head split-phase
The waterproof sealing of existing connecting portion.Since concentric reducer designs, smaller one end outer diameter matches with larger one end internal diameter size,
It is inserted into major part using microcephaly, annular module, blank pipe module can be sequentially connected in series.Interface module both ends are major part, both ends
It is both provided with special spanner and tightens boss 12, when being connect with adjacent elements, the microcephaly of adjacent elements is inserted into interface module one end
Portion, two pieces connect PVC sealing nuts module (including rubber seal), by rotating PVC sealing nuts, squeeze internal rubber
Glue sealing ring, realizes the waterproof sealing of connecting portion, and in Fig. 1, blank pipe microcephaly is inserted into the one end of interface module far from top closure
It is interior.The PVC sealing cover modules being arranged on interface module have internal thread, rubber seal are inside set, by tightening PVC sealings
Lid squeezes internal rubber seal and is tightly attached on the outside of internal PVC short tubes, realizes the sealing of upper port；Bottom annular is visited
The enlarged head enfeoffment mouth of pin module using PVC seal cover module, likewise, capping module have with outside ring-shaped probe module major part
The internal thread that screw thread matches squeezes internal rubber seal and is tightly attached to internal PVC short tubes by tightening PVC sealing covers
The sealing of lower port is realized in outside.
The present invention integrally use Modular assembled design, wherein ring-shaped probe module, PVC blank pipes module, interface module,
PVC seals cover module, PVC sealing nut modules etc. can flexible combination as needed.It can be seen from figure 1 that ring-shaped probe module,
There is a pvc pipe in PVC blank pipes module, interface module, certainly, PVC is not unique feasible material, as long as low-k
Nonmetallic materials may be incorporated for manufacture above-mentioned tubular body, such as caulking gum, high-strength PVC etc..PVC seals cover module, PVC
Sealing nut module is also made of PVC material, likewise, the nonmetallic materials of other low-ks can also be substituted for.It is low
Dielectric constant material can minimize the interference of the electromagnetic signal to being transmitted in ring-shaped probe, promote ring-shaped probe detection
The sensitivity of soil moisture and precision.Consider that sensor will be embedded in underground for a long time, full non-metal shell design can solve well
Certainly the problem of waterproof, antirust, anti-corrosion, significant increase sensor service life.Metal part in sensor is 50 Ω coaxial
The emulation of core conductor and metal screen layer extends in cable, if intermediate annular probe is that core conductor prolongs in 50 Ω coaxial cables
It stretches, the ring-shaped probe of both sides is the emulation extension extension of 50 Ω coaxial cable metal screen layers, ring-shaped probe module and interface mould
Other metalworks in the block are only to realize that company is connected with corresponding ring-shaped probe in core conductor and metal screen layer in 50 Ω coaxial cables
It connects.Metal part in this sensor is made of stainless steel, as needed, can also use other electric conductive dustproof metal substitute systems
It makes.
When using this tubular soil moisture sensor, hole drilling type can be used or the excavation type two ways scene of carrying out is buried,
Second sealing nut is enabled to be located at ground after burying well, the blank pipe module basseted is used to interface module raising a spacing
From easy to operation.Three ring-shaped probes can monitor the moisture data of 10 centimetres, 20 centimetres, 40 centimetres three soil layers simultaneously respectively
It is exported to TDR Test host by SMA conversion sockets, 50 Ω coaxial cables, is filled with PVC blank pipe modules at 30 cm layer of soil.
This sensor can choose corresponding ring-shaped probe module as needed and blank pipe module is attached, such as：When needing to monitor
When the moisture data of 10 centimetres, 40 centimetres two soil layers, blank pipe module is filled at 20 centimetres and 30 cm layer of soil, this two
A blank pipe module is connected by sealing nut each other.When the water for needing 10 centimetres, 20 centimetres, 30 centimetres three soil layers of monitoring
When divided data, then it is not necessarily to that blank pipe is arranged between ring-shaped probe module.
This sensor operating principles uses Time Domain Reflectometry principle.Time Domain Reflectometry principle (Time Domain
Reflectometry, TDR) last century the '30s are resulted from, initially it is used to the impaired position of detection and orientation and communication cable
It sets, last century the seventies find that TDR technologies can measure soil volumetric water content, and from after last century the eighties, the technology
Gradually develop to geotechnical engineering field, is mainly measuring water content of soil and dry density, monitoring Landslide Stability, compacted soil quality
Control etc. is applied, and is attracted attention with the features such as conveniently, safety is economic, digitlization and remote control.
When an electromagnetic pulse pumping signal is along transmission line, the interruption of transmission line impaired or periphery substance does not connect
Continuous property can cause the variation of its impedance, the variation of this impedance that the signal of transmission will be caused to generate one at this discontinuity point
A reflection, it is poor by the accurate journey time for measuring electromagnetic wave incident wave and back wave, then it can accurately judge that this does not connect
The position of continuous point.The spread speed v of frequency electromagnetic waves in the medium and apparent dielectric constant KaBetween meet following relationship：
Wherein：C=3x108Meter per second is the light velocity
Dielectric constant is higher, and speed is slower, and soil is made of air, mineral grain and water etc., the dielectric constant of air
It is 1, the dielectric constant of mineral grain is 2-4, and the dielectric constant of water is 80, due to other difference in dielectric constant with water in soil
Very big, the transmission speed for burying electromagnetic wave in ribbon feeder in the soil is highly dependent on soil moisture content, Canadian science
The famous empirical equation that family G.C.TOPP was provided in 1980 describes apparent dielectric constant K wellaWith soil volume of aqueous
Rate θvBetween relationship：
θv=4.3x10-6Ka3-5.5x10-4Ka2+2.92x10-2Ka-5.3x10-2 (2)
This is famous TOPP formula in the industry, this is possibly realized but also measuring moisture using TDR technologies.
The high frequency electromagnetic wave signal generated by TDR instruments inputs the sensor being inserted into soil by coaxial cable and (visits
Needle), since the change of impedance generates first pip, electromagnetic wave signal continues to move ahead along sensor (probe), reaches length
The second secondary reflection is generated for the probe end of L, reflection wave signal sends back TDR instruments along sensor, if it is assumed that electromagnetic wave edge
The time of sensor transmissions and reflection is Δ t, then has：To：
The technical means disclosed in the embodiments of the present invention is not limited only to the technological means disclosed in the above embodiment, further includes
By the above technical characteristic arbitrarily the formed technical solution of combination.It should be pointed out that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (9)
1. tubular type TDR soil moisture sensors, it is characterised in that：Include from top to bottom top closure, interface module, several annulars
Probe module, bottom cover further include several nonmetallic sealing nut modules and several blank pipe modules, described interface module one end
It is connect with top closure, the other end is connect by sealing nut module with a blank pipe module one end, the blank pipe module other end
It is connected with a ring-shaped probe module by sealing nut module, bottom ring-shaped probe module is connected by external screw thread and bottom cover
It connects；
It is attached by sealing nut module between adjacent two ring-shaped probes module
Or
Ring-shaped probe module is connect by sealing nut module with blank pipe module；
The interface module includes nonmetallic installing pipe and several SMA conversion sockets being arranged inside installing pipe；
The blank pipe module includes the nonmetallic installing pipe of interior sky；
The ring-shaped probe module includes that nonmetallic installing pipe, ring-shaped probe component and the SMA that is arranged inside installing pipe turn
Insert seat；The ring-shaped probe component includes three metal ring probes being equably sleeved on outside installing pipe, a metal positioning
Contact pin, two metal fitting nails, metal installation pedestal and insulated ring, wherein metal installation pedestal are arranged inside installing pipe；Gold
Belonging to ring-shaped probe one end, there is circular hole, metal positioning insertion pin through-hole, installing pipe side wall, metal on intermediate probe to be passed through to install base
Be connected to SMA conversion sockets after seat and have with SMA conversion sockets and be electrically connected, insulated ring setting metal positioning insertion pin with
Metal installation pedestal contact portion realizes that the insulation of contact pin and pedestal, metal fitting nail are used to both sides probe being fixed on metal peace
It fills on pedestal；The SMA conversion sockets of ring-shaped probe inside modules are connected by the SMA conversion sockets in connecting line and interface module
It connects.
2. tubular type TDR soil moisture sensors according to claim 1, it is characterised in that：Ring-shaped probe inside modules
SMA conversion sockets are connected one to one by connecting line and the SMA conversion sockets in interface module.
3. tubular type TDR soil moisture sensors according to claim 1, it is characterised in that：The interface module both ends are equal
With external screw thread, the blank pipe module and ring-shaped probe module, which are larger one end, has external screw thread, smaller one end outer diameter
Match with larger one end internal diameter, cover the internal thread for having and matching with interface module and ring-shaped probe module external screw thread,
Sealing nut module has the internal thread to match with interface module, blank pipe module, ring-shaped probe module external screw thread.
4. tubular type TDR soil moisture sensors according to claim 3, it is characterised in that：The blank pipe module and annular
The larger one end of probe module is provided with boss.
5. tubular type TDR soil moisture sensors according to claim 4, it is characterised in that：The boss is two, symmetrically
Setting.
6. tubular type TDR soil moisture sensors according to claim 1, it is characterised in that：The connecting line is coaxial electrical
Cable.
7. tubular type TDR soil moisture sensors according to claim 1, it is characterised in that：Positioning pin passes through metal ring
The circular hole on through-hole and nonmetallic installing pipe on probe stretches into pipe in metal installation pedestal, and is fixed by nut.
8. tubular type TDR soil moisture sensors according to claim 1, it is characterised in that：Nonmetallic materials are PVC.
9. tubular type TDR soil moisture sensors according to claim 1, it is characterised in that：Metal material is stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810454706.3A CN108709917A (en) | 2018-05-14 | 2018-05-14 | Tubular type TDR soil moisture sensors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810454706.3A CN108709917A (en) | 2018-05-14 | 2018-05-14 | Tubular type TDR soil moisture sensors |
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| CN108709917A true CN108709917A (en) | 2018-10-26 |
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ID=63868178
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| CN201810454706.3A Pending CN108709917A (en) | 2018-05-14 | 2018-05-14 | Tubular type TDR soil moisture sensors |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541181A (en) * | 2018-12-28 | 2019-03-29 | 昆明理工大学 | Open-pit mine blast deep Rock And Soil moisture content on-Line Monitor Device and monitoring method |
| CN111474322A (en) * | 2020-01-02 | 2020-07-31 | 南通中天精密仪器有限公司 | Modularized tubular soil moisture detection device and application method thereof |
| DE102019119281A1 (en) * | 2019-07-16 | 2021-01-21 | Endress+Hauser SE+Co. KG | Measuring device for determining a dielectric value profile |
| CN113495090A (en) * | 2020-04-01 | 2021-10-12 | 天津特利普尔科技有限公司 | Conduit type annular structure sensor and method for measuring soil moisture |
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