CN206161582U - Electric capacity type soil moisture sensor - Google Patents

Electric capacity type soil moisture sensor Download PDF

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Publication number
CN206161582U
CN206161582U CN201621252529.3U CN201621252529U CN206161582U CN 206161582 U CN206161582 U CN 206161582U CN 201621252529 U CN201621252529 U CN 201621252529U CN 206161582 U CN206161582 U CN 206161582U
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CN
China
Prior art keywords
circuit
crystal oscillating
oscillating circuits
type soil
electrode
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Expired - Fee Related
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CN201621252529.3U
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Chinese (zh)
Inventor
戴宇培
刘云飞
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戴宇培
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Priority to CN201621252529.3U priority Critical patent/CN206161582U/en
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Publication of CN206161582U publication Critical patent/CN206161582U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model provides an electric capacity type soil moisture sensor, includes the casing, set up in a plurality of capacitance probes of casing front end and set up the circuit in the casing, the capacitance probe includes that the outer joint has the outside cyclic annular electrode and the inside needle electrode of wire, inside needle electrode's periphery and terminal surface internal and external surface, the terminal surface of outside cyclic annular electrode are provided with polyimide insulation layer, the top of outside cyclic annular electrode is provided with insulating confined insulating lid, the circuit includes crystal oscillator circuit, multiple path of switch circuit, separates straight detection circuit, voltage doubler rectifier circuit, AD conversion and data processing circuit, serial ports acquisition circuit, multiple path of switch circuit passes through behind the capacitance probe in proper order and separates straight detection circuit, voltage doubler rectifier circuit, AD conversion and data processing circuit, serial ports acquisition circuit series connection, multiple path of switch circuit is connected with 40M crystal oscillator circuit, 50M crystal oscillator circuit, 90M crystal oscillator circuit, 40M crystal oscillator circuit, 50M crystal oscillator circuit, 90M crystal oscillator circuit parallel connection respectively.

Description

A kind of capacitor type soil humidity sensor
Technical field
The utility model is related to sensor technical field, relates in particular to a kind of capacitor type soil humidity sensor.
Background technology
Current more popular frequency domain bounce technique, operating frequency is generally 20-150MHz, by multiple circuits by dielectric constant Change be converted to DC voltage or other output forms, in working range its output DC voltage it is blunt with soil water-containing Connect correlation.
Frequency domain bounce technique is broadly divided into two kinds:1. frequency is fixed:Contained by measuring the change detection soil of its reference waveform Water rate;2. frequency is not fixed:Electric capacity with soil as medium is placed in resonant tank, when different its of soil moisture content occurs altogether The frequency shaken is different, by the change detection soil moisture content of resonant frequency.Both approaches its essence is still capacitance method.
There is the problems such as error is larger, and measurement range is limited, and capacitance probe bare metal in some sensors on the market Dew, it is perishable, do not adapt to be embedded in for a long time used in soil.Some errors are less, the big soil moisture sensing of measurement range Device price is then relatively expensive.
We are intended to design a kind of higher soil humidity sensor of cost performance, and measurement is expanded on the basis of lower-cost Scope, improves certainty of measurement.
Utility model content
For the defect of above-mentioned prior art, the utility model provides a kind of higher capacitor type soil moisture of cost performance and passes Sensor, expands measurement range on the basis of lower-cost, improves certainty of measurement.
For achieving the above object, technical solution adopted in the utility model is:
A kind of capacitor type soil humidity sensor, including housing, be arranged at some capacitance probes of housing forward end and set The circuit being placed in housing;
The capacitance probe includes being externally connected with the outer annular electrode of wire and internal needle electrode, the internal needle-like The periphery of electrode and end face, the surfaces externally and internally of the outer annular electrode, end face are provided with polyimide insulative layer, the outside The insulating lid of insulation and obturation is provided with the top of ring electrode;
The circuit include crystal oscillating circuit, multi-way switch circuit, every straight detecting circuit, voltage doubling rectifing circuit, AD conversion with Data processing circuit, serial acquisition circuit;The multi-way switch circuit after capacitance probe successively with every straight detecting circuit, times Voltage rectifier, AD conversion and data processing circuit, the connection of serial acquisition circuit connected in series, the multi-way switch circuit connects respectively There are 40M crystal oscillating circuits, 50M crystal oscillating circuits, 90M crystal oscillating circuits, 40M crystal oscillating circuits, 50M crystal oscillating circuits, 90M crystal oscillating circuits are in parallel Connection.
Used as the improvement to above-mentioned technical proposal, the 40M crystal oscillating circuits, 50M crystal oscillating circuits, 90M crystal oscillating circuits are have Source crystal oscillating circuit.
Used as the improvement to above-mentioned technical proposal, the multi-way switch circuit is the digital switch circuit of multichannel.
Used as the improvement to above-mentioned technical proposal, the capacitance probe is coaxial cable shape capacitance probe.
Used as the improvement to above-mentioned technical proposal, outer annular electrode is coaxial with internal needle electrode.
As the improvement to above-mentioned technical proposal, outer annular electrode height 50mm, external diameter 16mm, thickness 1mm.
As the improvement to above-mentioned technical proposal, the internal needle electrode:Length 50mm, diameter 1mm.
Compared with prior art, the utility model has the advantages and positive effects that:
Capacitor type soil humidity sensor of the present utility model, using active crystal oscillating circuit high frequency constant amplitude vibration letter is produced Number, digital switch circuit can complete the switching of crystal oscillator., every straight detecting circuit, output is to voltage multiplying rectifier electricity for the AC signal Jing of output Road, becomes feasible to the direct current signal observed, and after single-chip microcomputer collection signal and process, moisture content is received and shown by computer serial port Value.
Capacitor type soil humidity sensor of the present utility model, by the transformation to capacitance probe shape, the process of insulation, Improvement to circuit, the contrast verification and statistical analysis by lot of experimental data, reaches technique effect.
The above-mentioned circuit for referring to is known circuit:Wherein
Crystal oscillating circuit is shown in:《High-frequency circuit》(second edition) Wang Weidong is write, Electronic Industry Press P120~127.
Multi-way switch circuit is shown in:Fundamentals of Electronic Technology numerical portion (the 5th edition), Kang Hua light, Zou Shoubin, Qin Zhen P153~ 158。
See every straight detecting circuit:《High-frequency circuit》(second edition) Wang Weidong is write, and Electronic Industry Press P202~ 210。
Voltage doubling rectifing circuit is shown in:Fundamentals of Electronic Technology analog portion (the 5th edition), Kang Hua light, Chen great Qin, a woods P486~ 494。
AD conversion and data processing circuit:Single-chip microcomputer carries AD, programming realization.
Serial acquisition circuit:Single-chip microcomputer receiving data, through USB TTL modules are turned, and realize the communication with computer host computer.
Description of the drawings
In order to be illustrated more clearly that the utility model embodiment or technical scheme of the prior art, below will be to embodiment Or the accompanying drawing to be used needed for description of the prior art is briefly described, it should be apparent that, drawings in the following description are only It is some embodiments of the present utility model, for those of ordinary skill in the art, before creative labor is not paid Put, can be with according to these other accompanying drawings of accompanying drawings acquisition.
Fig. 1 is the structural representation of capacitance probe of the present utility model;
Fig. 2 is electrical block diagram of the present utility model;
The step of Fig. 3 is the first half flow process of this new software flow pattern schematic diagram;
The step of Fig. 4 is the latter half of flow process of this new software flow pattern schematic diagram.
Specific embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made The every other embodiment for being obtained, any modification, equivalent substitution and improvements made etc., should be included in of the present utility model Within protection domain.
As shown in Figure 1, 2, capacitor type soil humidity sensor of the present utility model, capacitor type soil humidity sensor, bag Include housing, some capacitance probes for being arranged at housing forward end and the circuit being arranged in housing;
The capacitance probe includes being externally connected with the outer annular electrode 1 of wire and internal needle electrode 2, the internal needle The periphery of shape electrode 2 and end face, the surfaces externally and internally of the outer annular electrode 1, end face are provided with polyimide insulative layer, described The top of outer annular electrode 1 is provided with the insulating lid 3 of insulation and obturation;
The circuit include crystal oscillating circuit, multi-way switch circuit, every straight detecting circuit, voltage doubling rectifing circuit, AD conversion with Data processing circuit, serial acquisition circuit;The multi-way switch circuit after capacitance probe successively with every straight detecting circuit, times Voltage rectifier, AD conversion and data processing circuit, the connection of serial acquisition circuit connected in series, the multi-way switch circuit connects respectively There are 40M crystal oscillating circuits, 50M crystal oscillating circuits, 90M crystal oscillating circuits, 40M crystal oscillating circuits, 50M crystal oscillating circuits, 90M crystal oscillating circuits are in parallel Connection.
The 40M crystal oscillating circuits, 50M crystal oscillating circuits, 90M crystal oscillating circuits are active crystal oscillating circuit.The variable connector electricity Road is the digital switch circuit of multichannel.The capacitance probe is coaxial cable shape capacitance probe.
Outer annular electrode and internal needle electrode are coaxial.Outer annular electrode height 50mm, external diameter 16mm, thickness 1mm.The internal needle electrode:Length 50mm, diameter 1mm.
Compared with prior art, the utility model has the advantages and positive effects that:
Capacitor type soil humidity sensor of the present utility model, using active crystal oscillating circuit high frequency constant amplitude vibration letter is produced Number, multi-way switch circuit can complete the switching of crystal oscillator., every straight detecting circuit, output is to voltage multiplying rectifier electricity for the AC signal Jing of output Road, becomes feasible to the direct current signal observed, and after single-chip microcomputer collection signal and process, moisture content is received and shown by computer serial port Value.
Capacitor type soil humidity sensor of the present utility model, by the transformation to capacitance probe shape, the process of insulation, Improvement to circuit, the contrast verification and statistical analysis by lot of experimental data, reaches technique effect.
The above-mentioned circuit for referring to is known circuit:Wherein
Crystal oscillating circuit is shown in:《High-frequency circuit》(second edition) Wang Weidong is write, Electronic Industry Press P120~127.
Multi-way switch circuit is shown in:Fundamentals of Electronic Technology numerical portion (the 5th edition), Kang Hua light, Zou Shoubin, Qin Zhen P153~ 158。
See every straight detecting circuit:《High-frequency circuit》(second edition) Wang Weidong is write, and Electronic Industry Press P202~ 210。
Voltage doubling rectifing circuit is shown in:Fundamentals of Electronic Technology analog portion (the 5th edition), Kang Hua light, Chen great Qin, a woods P486~ 494。
AD conversion and data processing circuit:Single-chip microcomputer carries AD, programming realization.
Serial acquisition circuit:Single-chip microcomputer receiving data, through USB TTL modules are turned, and realize the communication with computer host computer.
Its software flow pattern is as shown in Figure 3 and Figure 4.
This new capacitor type soil humidity sensor:1) precision is higher, and sensitivity more preferably, solves high-moisture percentage scope Certainty of measurement is not high, the low problem of resolution ratio.2) cost is relatively low, and cost performance is high.3) its measurement of water ratio scope is 0-100%, Global error is ± 2%.This system can in real time measure soil moisture, with spies such as high resolution, strong adaptability, applied ranges Point.4) moisture content 0-15% time errors are less than 0.5%, and moisture content 15%-25% time errors are less than 2%, moisture content 25%-60% Time error is less than 1%, and moisture content 60%-100% time errors are less than 2%, and segmentation method improves soil low-water-content and height contains The certainty of measurement of water rate scope.

Claims (7)

1. a kind of capacitor type soil humidity sensor, including housing, some capacitance probes for being arranged at housing forward end and setting Circuit in housing;It is characterized in that:
The capacitance probe includes being externally connected with the outer annular electrode of wire and internal needle electrode, the internal needle electrode Periphery and end face, the surfaces externally and internally of the outer annular electrode, end face be provided with polyimide insulative layer, the outer annular The insulating lid of insulation and obturation is provided with the top of electrode;
The circuit is including crystal oscillating circuit, multi-way switch circuit, every straight detecting circuit, voltage doubling rectifing circuit, AD conversion and data Process circuit, serial acquisition circuit;The multi-way switch circuit after capacitance probe successively with every straight detecting circuit, times repoussage Current circuit, AD conversion and data processing circuit, serial acquisition circuit connected in series connection, the crystal oscillating circuit include 40M crystal oscillating circuits, 50M crystal oscillating circuits, 90M crystal oscillating circuits, it is brilliant that the multi-way switch circuit connects respectively 40M crystal oscillating circuits, 50M crystal oscillating circuits, 90M Shake circuit, and 40M crystal oscillating circuits, 50M crystal oscillating circuits, 90M crystal oscillating circuits are connected in parallel.
2. capacitor type soil humidity sensor according to claim 1, it is characterised in that:The 40M crystal oscillating circuits, 50M Crystal oscillating circuit, 90M crystal oscillating circuits are active crystal oscillating circuit.
3. capacitor type soil humidity sensor according to claim 1, it is characterised in that:The multi-way switch circuit is many The digital switch circuit on road.
4. capacitor type soil humidity sensor according to claim 1, it is characterised in that:The capacitance probe is coaxial electrical Cable shape capacitance probe.
5. capacitor type soil humidity sensor according to claim 4, it is characterised in that:Outer annular electrode and internal needle Shape electrode is coaxial.
6. capacitor type soil humidity sensor according to claim 5, it is characterised in that:The outer annular electrode height 50mm, external diameter 16mm, thickness 1mm.
7. capacitor type soil humidity sensor according to claim 5, it is characterised in that:The internal needle electrode:It is long Degree 50mm, diameter 1mm.
CN201621252529.3U 2016-11-17 2016-11-17 Electric capacity type soil moisture sensor Expired - Fee Related CN206161582U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201621252529.3U CN206161582U (en) 2016-11-17 2016-11-17 Electric capacity type soil moisture sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201621252529.3U CN206161582U (en) 2016-11-17 2016-11-17 Electric capacity type soil moisture sensor

Publications (1)

Publication Number Publication Date
CN206161582U true CN206161582U (en) 2017-05-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201621252529.3U Expired - Fee Related CN206161582U (en) 2016-11-17 2016-11-17 Electric capacity type soil moisture sensor

Country Status (1)

Country Link
CN (1) CN206161582U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109307692A (en) * 2018-04-28 2019-02-05 中国农业大学 A kind of soil moisture monitoring system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109307692A (en) * 2018-04-28 2019-02-05 中国农业大学 A kind of soil moisture monitoring system

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20170510

Termination date: 20181117

CF01 Termination of patent right due to non-payment of annual fee