CN205506739U - Humidity sensor - Google Patents
Humidity sensor Download PDFInfo
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- CN205506739U CN205506739U CN201620227992.6U CN201620227992U CN205506739U CN 205506739 U CN205506739 U CN 205506739U CN 201620227992 U CN201620227992 U CN 201620227992U CN 205506739 U CN205506739 U CN 205506739U
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Abstract
The utility model provides a humidity sensor includes: drive unit, electrode unit, induction element, drive unit produces and detects the drive signal of telecommunication and output, the electrode unit includes in the circuit two metal electrode of electric rupturable each other: driving electrode and response electrode, the humidity change of two metal electrode medium things can arouse two metal electrode changes of impedance within a definite time, driving electrode receives the detection drive signal of telecommunication of drive unit output, the response electrode through with impedance between the driving electrode produces electric induction, produces sensing signal thereupon and surveys signal output as the electric -examination, induction element with response electrode coupling, receive by response output electrode's electric detected signal, and will humidity detected signal and the output of signal processing for meeting the requirements is surveyed in the electric -examination. The application provides a humidity sensor has simple structure, measures characteristics accurate, easily operation.
Description
Technical field
The application relates to electronic device field, is specifically related to a kind of humidity sensor.
Background technology
Humidity sensor is widely used in the daily life of industry, agricultural production and the mankind, raw in agricultural
In product, such as farm, wheatland, the data that people utilize humidity sensor to provide understand rain fall, soil moisture in the soil
Feelings, in orchard, green house of vegetables, humidity is also an important information, in conjunction with other data, helps grower
Judge whether to need to irrigate, the Probability of pest and disease damage and whether taking measures；In warehouse, help prison
Survey warehouse environment and the situation of stored agricultural product.The most in recent years, along with the rise of Internet of Things, humidity passes
The effect of sensor can be more and more important.
General humidity sensor has a several types:
Simplest a kind of it is made up of two metal electrodes and the porous material being connected between two metal electrodes,
Power supply used is unidirectional current.When metal electrode two ends are plus DC voltage, two interelectrode impedance magnitude reactions
Humidity size.This humidity sensor usual only one of which impedance threshold, when the impedance recorded is less than described threshold
During value, it is taken as wet；Otherwise, it is simply that dry.The advantage of this humidity sensor is simple in construction, cost
Low；Shortcoming is: 1) precision is low, and described porous material is difficult to simulate the shape of blade；2) unidirectional current can make
Metal electrode occurs electrochemical reaction to cause galvanic corrosion under the wet environment of saliferous.
In existing patent, also have at metal electrode two ends plus alternating voltage, utilize two interelectrode impedances
Size detection humidity size.Patent CN204426210U provides that " a kind of blade for cutting propagation is wet
Degree sensor ", described humidity sensor uses alternating voltage, comes by measuring the impedance between two metal electrodes
Sensing humidity, but this humidity value be simple one for controlling the threshold value of heating circuit, when humidity is higher than
Setting threshold value, heating circuit works；When humidity is less than setting threshold value, and heating circuit is closed.Obviously, this
Only " do ", the sensor of " wet " two states can be only applied to the field the highest to humidity data required precision
Close.
Another kind of humidity sensor is capacitance type humidity sensor, and capacitance type humidity sensor is a kind of noncontact
Formula, utilize capacitive coupling technique to measure humidity, advantage is stable；Shortcoming is 1) structure complexity, cost
High；2) easily affected by other capacitance body, such as the other parts of plant, the impact of birds, insecticide etc..
It addition, also have some humidity sensors to estimate the wet of measured object by the dielectric constant of sensing measured object
Degree, similar, patent CN103293189A provide " a kind of plant leaf blade surface moisture sensor and
Measurement apparatus ", described humidity sensor electrode partial simulation blade shape, the simulation of described humidity sensor
Blade is divided into two parts, and the part on the left side by two ring-type copper grid metal electrodes, utilizes input, defeated
Go out the decay of electrode frequency to the humidity sensing on blade face；The part on the right has the grid-like of two imitative leaf lines
Metal electrode, described metal electrode is bonded at the both sides on blade face, and the blade face of described humidity sensor is to steam spirit
The cellulose acetate macromolecular material that sensitivity is high, two metal electrodes form electric capacity with middle blade face, by electricity
The change of blade humidity is measured in the change held, and the combination of left and right two parts measured value forms final moisture content.
Described humidity sensor electrode part can simulate blade shape, uses RF-reflective and capacitance principle to obtain
Quantitative humidity value, but structure is complicated, not only needs two groups of humidity measuring instruments, in addition it is also necessary to and a band is micro-
The processing platform cooperation of processor, and limited by structure, described humidity sensor and processing platform distance
Short, the spatial dimension of moisture measurement is limited, it addition, the blade material of flexibility causes gold the most at work
Belong to the damage of electrode.
Summary of the invention
The application provides a kind of humidity sensor, overcomes the impedance currently with measured object to detect humidity
Humidity sensor only " doing ", " wet " two states, it is impossible to accurately measure humidity value and obtain defect, avoid again
Condenser type, permittivity structure are complicated, and cost is high, and the deficiency that easily affected by other non-measured object.
The humidity sensor that the application provides, including:
Produce detection and drive the signal of telecommunication the driver element exported；
Electrode unit, described electrode unit includes the most electrically isolated two metal electrode: drive
Electrode and induction electrode；Described drive electrode and described induction electrode are attached on substrate with the shape set；
Between said two metal electrode, the humidity change of dielectric object can cause the change of impedance between said two metal electrode
Change；Described drive electrode receives the detection of described driver element output and drives the signal of telecommunication, and described induction electrode leads to
Cross the impedance between described drive electrode and produce electric induction, produce induced signal therewith as power detection signal
Output；
Sensing unit, described sensing unit couples with described induction electrode, receives and is exported by described induction electrode
Power detection signal, and described power detection signal is processed as satisfactory Humidity Detection signal and exports.
Optionally, described driver element includes alternating current generative circuit；Described detection drives the signal of telecommunication to be this friendship
Stream is electrically generated the alternating current of circuit output.
Optionally, described alternating current generative circuit uses unstable state multi-resonant oscillating circuit form.
Optionally, described substrate is to adopt the thin plate being made from an insulative material, including:
The blade shape similar to the plant leaf blade of humidity to be detected, as the electrode of described electrode unit carrier
District；
As described driver element, described sensing unit circuit carrier, including for described humidity sensor energy supply
Input, grounding ports, the circuit region of output port of described sensing unit；
Described electrode district is connected with described circuit region.
Optionally, described induction electrode is formed with described drive electrode and is parallel to each other and the identical fixed number really of width
The strip branch of amount, is distributed on the substrate surface in described electrode of substrate district；The described strip of Different electrodes divides
It is alternately distributed and spacing keeps consistent；It it is conducting between the described strip branch of same electrode.
Optionally, the described branch trend of described induction electrode and described drive electrode with humidity to be detected
The vein trend of plant leaf blade is consistent.
Optionally, described induction electrode and described drive electrode etch on the substrate.
Optionally, described induction electrode and described drive electrode surface gold-plating.
Optionally, described sensing unit includes filter circuit；Described sensing unit couples with described induction electrode,
The most described filter circuit couples with described induction electrode, by the institute of the form of communication that induction electrode exports
Stating power detection signal rectification is DC signal.
Optionally, described sensing unit includes integrated operational amplifier circuit；Described integrated operational amplifier circuit with
Described filter circuit couples, and receives the DC signal of described filter circuit output, by described DC signal
Export after shaping, amplification.
Optionally, the Humidity Detection signal of described humidity sensor output is d. c. voltage signal；Described direct current
Voltage signal size is linear with the humidity value of measured medium thing corresponding；Two extreme values of described d. c. voltage signal
Represent adiabatic drying and the most moistening respectively.
Optionally, described d. c. voltage signal is that the DC voltage of 0-2V: 0V represents adiabatic drying, 2V generation
Table is the most moistening.
Optionally, the running voltage of described humidity sensor is the unidirectional current of 2.6-10V.
Optionally, the input port of described humidity sensor is between described driver element input and earth terminal；
The output port of described humidity sensor is between the output and ground of described sensing unit.
Optionally, the outer protected set of the described circuit region of described humidity sensor.
Present invention also provides a kind of humidity measuring instrument, including:
Humidity sensor, humidity sensor the most mentioned above；
Mounting frame for sensor, described mounting bracket is used for being arranged in test environment described humidity sensor,
Ensure that the installation site of described humidity sensor, angle are similar to the plant leaf blade in described test environment；
Sensor detection node, described sensor test node provides electric energy for described humidity sensor, and connects
Receive the Humidity Detection signal that described humidity sensor passes over, export after treatment；
Cable, described cable is in order to connect described humidity sensor and described sensor detection node.
Optionally, described sensor detection node includes:
Analog-to-digital conversion module, the Humidity Detection that described humidity sensor is passed over by described analog-to-digital conversion module
Signal is converted into digital signal；
Central processing module, described central processing module is according to predetermined test program, to described humidity sensor
Device sends testing requirement, and is processed by the humidity data obtained in the detection cycle；
Power module, described power module is described sensor test node and described humidity sensor energy supply；
Wireless communication module, the humidity data that described wireless communication module will obtain from described central processing module
It is sent to distance host, and receives the instruction of described distance host.
Compared with prior art, the application has the advantage that
The humidity sensor that the application provides, has driver element, electrode unit and sensing unit, Qi Zhong electricity
Pole unit is provided with drive electrode and induction electrode, and impedance between the two can be along with Jie between the two
Pledge humidity changes and changes.So, receive, when drive electrode, the detection driving signal that driver element provides
After, described induction electrode output power detection signal can be different due to the difference of dielectric object humidity, described sensing
After the power detection signal of unit reception above-mentioned induction electrode output process, the Humidity Detection signal of output is the most permissible
Reflect that the humidity of environment to be detected is correlated with.Use this kind of technical scheme, it is possible to use the circuit of simple in construction is real
Now humidity value is measured the most accurately.
Owing to, in technique scheme, driver element can be designed as exporting different detections as required and drive
Dynamic signal, this is just that the particular/special requirement meeting difference detection environment provides possibility.Such as, the application's
In preferred embodiment, described driver element can be designed as the detection of output AC form and drives signal, logical
Cross the selection using higher alternating current voltage frequency, the electrochemical corrosion shadow to metal electrode can be prevented effectively from
Ring, and can be by higher alternating current voltage frequency, it is also possible to make the detection cycle of described humidity sensor
Shorten, save electric energy.
In the preferred embodiment of the application, the metal electrode of described humidity sensor is equally distributed,
Ensure that output voltage is also linear；It is easy to this humidity sensor is demarcated.
In the preferred embodiment of the application, a kind of structure of described humidity sensor has and hygrometric to be checked
Shape, the shape of metallic grid that the plant leaf blade of degree is similar to are consistent, described wet with the vein of blade trend
In the case of degree sensor is correctly installed, the landing of real blade surface water, evaporation can be simulated well,
And thermal capacitance characteristic is also close to the plant leaf blade of a piece of normal size.
Accompanying drawing explanation
The function unit figure of the humidity sensor that Fig. 1 the application first embodiment provides；
The structure chart of the leaf wetness sensors that Fig. 2 the application the second embodiment provides；
The outline drawing of the leaf wetness sensors that Fig. 3 the application the second embodiment provides；
The module composition diagram of the humidity measuring instrument that Fig. 4 the application the 3rd embodiment provides.
Detailed description of the invention
Elaborate a lot of detail in the following description so that fully understanding this utility model.But this
Utility model can be implemented to be much different from alternate manner described here, and those skilled in the art are permissible
Doing similar popularization in the case of this utility model intension, therefore this utility model is not by described below
The restriction being embodied as.
The application first embodiment provides a kind of humidity sensor, and Fig. 1 shows described humidity sensor
Function unit figure.
As it is shown in figure 1, described humidity sensor includes driver element 1, electrode unit 2 and sensing unit 3.
The generation detection that act as of described driver element 1 drives the signal of telecommunication.Described driver element 1 includes one
Multi-resonant oscillating circuit, the operational amplifier U1B in described multi-resonant oscillating circuit is operated in voltage comparator state,
Positive feedback network by R2, R3 by input in the same direction with U1B after output voltage V1 dividing potential drop, i.e. "+"
End be connected, as reference voltage V+；The backward voltage V-of reverse input end "-" takes free capacitance C6 and electricity
Electric capacity C6 described in the oscillating circuit that resistance R4 forms and the voltage between power supply ground GND.Described reverse electricity
Pressure V-and described reference voltage V+compare, determine that described output voltage V1 exports high level or low level.
Due to described electric capacity C6 constantly at positive and negative both direction charging and discharging, described backward voltage V-is made constantly to be more than
With less than described reference voltage V+, make output voltage V1 punctuated turning between low, high level, thus
Resistance and the capacitance of selected electric capacity to the ac signal of certain frequency, described frequency and selected resistance
Relevant.Described output voltage V1 exports institute by becoming detection driving voltage V2 after the filtration of electric capacity C2
State electrode unit 2.The most described detection of this detection driving voltage V2 drives the signal of telecommunication.
In this example, it is assumed that described driver element 1 is by reasonably selecting resistance and the electricity of related resistors
The capacitance held, creates the ac signal that frequency is 5KHz and drives the signal of telecommunication as described detection.5KHz
The cycle of alternating current is 0.2ms, and this makes the moisture measurement cycle can foreshorten to 1ms or shorter, and measures week
The shortening of phase means low power consumption；Meanwhile, the detection driving signal of telecommunication of upper frequency can also be the most anti-
The only electrochemical corrosion of each electrode of described electrode unit.
Described electrode unit 2 includes metal electrode: drive electrode 201, induction electrode 202, and as institute
State the substrate 24 of the carrier of drive electrode 201 and induction electrode 202.
The formation of described drive electrode 201, induction electrode 202 is parallel to each other and width is identical, quantification
Strip branch；It is distributed on described substrate surface；Described drive electrode 201, the institute of induction electrode 202
State strip branch to be alternately distributed and spacing keeps consistent；It it is conducting between the described strip branch of same electrode.
Owing to the described strip branch spacing of described metal electrode keeps consistent and the most uniform,
So on described substrate surface the water yield number be directly proportional to the impedance between described metal electrode, described metal electricity
The impedance of interpolar is directly proportional to the output voltage of described humidity sensor, and so, described output voltage is with described
The humidity of substrate surface is exactly linear corresponding relation.
Described driver element 1 is connected with the described drive electrode 201 of described electrode unit 2, described electrode list
The described induction electrode 202 of unit 2 is connected with sensing unit 3；Described detection driving voltage V2 is through described
Between drive electrode 201 and described induction electrode 202 after the decay of impedance, defeated from described induction electrode 202
Go out alternating voltage V3 to described sensing unit 3.
Described sensing unit 3 includes rectification circuit, filter circuit and operational amplifier U1A.
Described sensing unit 3 receives the alternating voltage V3 that described induction electrode 202 passes over, described exchange
Voltage V3 first passes through the described rectification circuit being made up of electric capacity C4, resistance R7 and diode D1, described
Rectification circuit utilizes one-way conduction effect and the discharge principle of described electric capacity C4 of described diode D1, by institute
State ac voltage signal V3 and become d. c. voltage signal V4.
Described d. c. voltage signal V4 is owing to being affected by described electric capacity C4 flash-over characteristic, it is impossible to be completely secured
D. c. voltage signal uniform and stable；Described filter circuit, described filtering is had in the rear end of described rectification circuit
Circuit includes electric capacity C3 and resistance R6, described filter circuit by the charge and discharge characteristic of described electric capacity C3,
The waveform making described d. c. voltage signal V4 further smooths, and obtains galvanic current pressure signal V5.
Described d. c. voltage signal V5 accesses the port 3 of described operational amplifier U1A, and negative feedback network is by defeated
Go out voltage after resistance R8, resistance R5 dividing potential drop, be loaded into the reverse input end of described operational amplifier U1A,
I.e. port 2；The resistance value that described resistance R8 and described resistance R5 chooses determines described operational amplifier U1A
Amplification.
The power end of described operational amplifier U1A ground connection respectively and external direct current power supply VCC connect；Described
It is provided with filter capacitor to filter external direct current power supply between external direct current power supply VCC and power supply ground GND
The alternating component of VCC.
Described d. c. voltage signal V5 is conduct detection output voltage V6 after described operational amplifier U1A amplifies
Output, after demarcating, the humidity value line of the measured object between described detection output voltage V6 and described metal electrode
Property corresponding, by selecting suitable electrical parameter, described detection output voltage V6 can be adjusted in maximum
Between value 2V and minima 0V, wherein, maximum 2V represents the most moistening；Minima is that 0V represents absolutely
To being dried.
The described humidity sensor that the present embodiment provides generates the exchange detection signal of telecommunication at described driver element, defeated
Going out the signal of telecommunication is d. c. voltage signal, and circuit only includes basic electronic devices and components, without processor, structure
Simply；The described output signal of telecommunication becomes linear dependence with the humidity value of measured object, demarcates simple；Internal high frequency is handed over
The application of the stream detection signal of telecommunication is possible not only to alleviate the galvanic corrosion of described metal electrode, moreover it is possible to shorten the detection cycle,
Save electric energy.
Present invention also provides the second embodiment: a kind of leaf wetness sensors.
Described leaf wetness sensors is the one of humidity sensor, is used for detecting plant leaf blade surface moisture,
It it is the critical component of information gathering in automatization's agricultural；On the other hand, plant surface humidity size, continue
Time is the significant data required for the monitoring prevention of plant pest.
In order to correctly measure blade surface humidity, leaf wetness sensors should meet:
1, the physical characteristic of humidity sensor should be similar with the characteristic of real blade as far as possible, and described humidity passes
Sensor should simulate the shape of real blade, thermal characteristics, thickness and surface emissivity characteristic, so, described wet
Moisture on degree sensor is just consistent with real blade.
2, must use precise and stable measuring method, this method should be anti-interference, reproducible, not
Under same obstruction conditions, Humidity Detection value to be prone to demarcate.
3, the measuring method used should be able to prevent the galvanic corrosion of electrode, extends the life-span of described humidity sensor.
Further, described leaf wetness sensors also should meet the market demand:
1, low power consumption, low-work voltage, can in the widest voltage range steady operation, so, institute
State humidity sensor just to mate with various data collecting systems, sense including by battery-driven wireless type
Device detection node.
2, galvanic corrosion can be resisted, the corrosion of chemical substance in anti-rainwater, pesticide and birds droppings.
3, low production cost.
Fig. 2 shows the structure chart of the described leaf wetness sensors of the second embodiment offer.This leaf wetness
Sensor can be considered as an application of the humidity sensor that above-mentioned first embodiment provides, wet to this blade face
In the introduction of degree sensor, every element identical with the described humidity sensor of first embodiment, use same
The label of sample.
As in figure 2 it is shown, described leaf wetness sensors includes: driver element 1, electrode unit 2, sensing list
Unit 3, substrate 24, input/output interface 25.
Described driver element 1 produces detection and drives the signal of telecommunication.The specific implementation of this driver element, please join
See the driver element 1 in above-mentioned first embodiment.
Described electrode unit 2 includes metal electrode: drive electrode 201, induction electrode 202.
The formation of described drive electrode 201, induction electrode 202 is parallel to each other and width is identical, quantification
Strip branch；It is distributed on the substrate surface of described electrode district；Described drive electrode 201, induction electrode
The described strip branch of 202 is alternately distributed and spacing keeps consistent；It is to lead between the described strip branch of same electrode
Lead to.
Owing to the described strip branch spacing of described metal electrode keeps consistent and uniform on described substrate 24,
So on described substrate surface the water yield number be directly proportional to the impedance between described metal electrode, described metal electricity
The impedance of interpolar is directly proportional to the output voltage of described humidity sensor, and so, described output voltage is with described
On substrate surface, the water yield is exactly linear corresponding relation.
Described driver element 1 is connected with described drive electrode 201, described induction electrode 202 and sensing unit
03 connects；The described detection driving voltage produced by described driver element 01 is through described drive electrode 201
And become ac voltage signal after the decay of impedance between described induction electrode 202 and export described sensing unit
3, after the filtering of described sensing unit 3, rectification, amplification, become d. c. voltage signal output, this unidirectional current
Pressure signal is exactly described Humidity Detection signal.
The leaf wetness sensors provided for the present embodiment, described substrate 24 is to use electrically insulating material system
The thin plate become, material is FR-4 glass-epoxy force fit plate.
Described substrate 24 includes two regions: electrode district, and described electrode district makes the shape of blade, described in drive
Moving electrode 201 and induction electrode 202 are distributed in electrode district；Circuit region, described circuit region is that described driving is single
Unit 1 and the carrier of sensing unit 3.
The material of described metal electrode is copper, described metal electrode, described driver element and described sensing unit
Circuit pack be all by with make the identical processing technique of printed circuit board (PCB) and be etched on described substrate 24.
Described drive electrode 201, induction electrode 202 outer surface gold-plated, gold can effectively prevent described metal
Electrode is corroded by rainwater, birds droppings, pesticide energy chemical substance, extends the use longevity of described humidity sensor
Life.
Described humidity sensor also includes input, output port 25, is used for accessing supply voltage and output institute
State Humidity Detection signal.
Fig. 3 shows the outline drawing of described leaf wetness sensors, as it is shown on figure 3, described humidity sensor
Also include protecting set 26, scribble waterproof gasket cement at described protection set 26 and described substrate 24 seam, rise
To the described driver element 1 protected on described substrate 24 and the effect of described sensing unit 3.
Present invention also provides the third embodiment: a kind of humidity measuring instrument, Fig. 4 is that the 3rd embodiment carries
The module composition diagram of the humidity measuring instrument of confession.
As shown in Figure 4, described humidity measuring instrument includes: humidity sensor S1, mounting frame for sensor S2,
Sensor detection node S3, cable S4.
Described humidity sensor S1 is exactly the humidity sensor that the present embodiment provides.
Described mounting frame for sensor S2, for being arranged in test environment by described humidity sensor S1, protects
Demonstrate,prove the installation site of described humidity sensor S1, angle similar to the plant leaf blade in described test environment.
Described sensor detection node S3 provide electric energy for described humidity sensor, and receives described humidity sensor
The Humidity Detection signal that device passes over, exports after treatment；Described sensor detection node S3 includes:
Analog-to-digital conversion module S301, the humidity that described humidity sensor is passed over by described analog-to-digital conversion module
Detection signal is converted into digital signal；
Central processing module S302, described central processing module is according to predetermined test program, to described humidity
Sensor sends testing requirement, and is processed by the humidity data obtained in the detection cycle；
Wireless communication module S303, described wireless communication module S303 will process S302 module from described central authorities
The humidity data obtained is sent to distance host, and receives the instruction of described distance host；
Power module S304, described power module is described sensor detection node S303 and described humidity sensor
Device S1 energy supply.
Described sensor detection node S3 can manually set the detection cycle and humidity data transmits the cycle, or logical
Cross long-range host setting.
Described cable S4 is in order to connect described humidity sensor S1 and described sensor detection node S3, described
Cable S3 includes three kinds of cables:
Holding wire, described holding wire connects the output port of described humidity sensor S1 and described analog digital conversion mould
The input port of block S301；
Power line, described power line connects the power input interface of described humidity sensor S1 and described power supply mould
The output interface of block S304；
Earth lead, described earth lead connects the grounding ports of described humidity sensor S1 and detects with described sensor
The grounding ports of node S3, it is ensured that described humidity sensor S1 reliable ground.
The work process of described humidity detector can be described as follows:
When described central processing module S302 started to detect according to the detection cycle set, first to described power supply
Module S304 sends power supply instruction, and described power module S304 connects the power supply of described humidity sensor,
When power supply is loaded into the described driver element 1 of described humidity sensor, described driver element 1 produces exchange
Detection drives signal loading to receive through described drive electrode to described drive electrode 201, described sensing unit 3
Described power detection signal after dielectric object resistive degeneration between 201 and described induction electrode 202, and it is whole
After flowing, filtering, amplify, exporting as described Humidity Detection signal, described analog-to-digital conversion module S301 passes through
Described holding wire receives described Humidity Detection signal, passes to described central authorities and process after being translated into digital signal
Module S302, described central processing module S302 stores described digital signal.Detection end cycle, described in
Centre processing module S302 sends cut-offing instruction to described power module S304, and described power module S304 cuts off
The power supply of described humidity sensor.
Although this utility model is open as above with preferred embodiment, but it is not for limiting this utility model,
Any those skilled in the art, without departing from spirit and scope of the present utility model, can make possible
Variation and amendment, protection domain the most of the present utility model should be defined with this utility model claim
Scope is as the criterion.
Claims (17)
1. a humidity sensor, it is characterised in that described humidity sensor includes:
Produce detection and drive the signal of telecommunication the driver element exported；
Electrode unit, described electrode unit includes the most electrically isolated two metal electrode: drive
Electrode and induction electrode；Described drive electrode and described induction electrode are attached on substrate with the shape set；
Between said two metal electrode, the humidity change of dielectric object can cause the change of impedance between said two metal electrode
Change；Described drive electrode receives the detection of described driver element output and drives the signal of telecommunication, and described induction electrode leads to
Cross the impedance between described drive electrode and produce electric induction, produce induced signal therewith as power detection signal
Output；
Sensing unit, described sensing unit couples with described induction electrode, receives and is exported by described induction electrode
Power detection signal, and described power detection signal is processed as satisfactory Humidity Detection signal and exports.
Humidity sensor the most according to claim 1, it is characterised in that described driver element includes handing over
Stream is electrically generated circuit；The alternating current that described detection drives the signal of telecommunication to be the output of this alternating current generative circuit.
Humidity sensor the most according to claim 2, it is characterised in that described alternating current generative circuit
Use unstable state multi-resonant oscillating circuit form.
Humidity sensor the most according to claim 1, it is characterised in that described substrate is to use insulation
The thin plate that material is made, including:
The blade shape similar to the plant leaf blade of humidity to be detected, as the electrode of described electrode unit carrier
District；
As described driver element, described sensing unit circuit carrier, including for described humidity sensor energy supply
Input, grounding ports, the circuit region of output port of described sensing unit；
Described electrode district is connected with described circuit region.
Humidity sensor the most according to claim 4, it is characterised in that described induction electrode is with described
The strip branch of the quantification that drive electrode formation is parallel to each other and width is identical, is distributed on described substrate electricity
On the substrate surface of polar region；The described strip branch of Different electrodes is alternately distributed and spacing keeps consistent；Same
It it is conducting between the described strip branch of electrode.
Humidity sensor the most according to claim 5, it is characterised in that described induction electrode is with described
Drive electrode described branch trend with humidity to be detected plant leaf blade vein move towards consistent.
Humidity sensor the most according to claim 1, it is characterised in that described induction electrode is with described
Drive electrode etches on the substrate.
Humidity sensor the most according to claim 1, it is characterised in that described induction electrode is with described
Drive electrode surface gold-plating.
Humidity sensor the most according to claim 2, it is characterised in that described sensing unit includes filter
Wave circuit；Described sensing unit couples with described induction electrode, the most described filter circuit and described sensing
Electrode couples, and the described power detection signal rectification of the form of communication exported by induction electrode is DC signal.
Humidity sensor the most according to claim 9, it is characterised in that described sensing unit includes
Integrated operational amplifier circuit；Described integrated operational amplifier circuit couples with described filter circuit, receives described filter
The DC signal of wave circuit output, exports after described DC signal shaping, amplification.
11. humidity sensors according to claim 10, it is characterised in that described humidity sensor is defeated
The Humidity Detection signal gone out is d. c. voltage signal；Described d. c. voltage signal size is wet with measured medium thing
The linear correspondence of angle value；Two extreme values of described d. c. voltage signal represent adiabatic drying and the most moistening respectively.
12. humidity sensors according to claim 11, it is characterised in that described d. c. voltage signal
Being that the DC voltage of 0-2V: 0V represents adiabatic drying, 2V represents the most moistening.
13. humidity sensors according to claim 1, it is characterised in that described humidity sensor
Running voltage is the unidirectional current of 2.6-10V.
14. humidity sensors according to claim 1, it is characterised in that described humidity sensor
Input port is between described driver element input and earth terminal；The output port of described humidity sensor exists
Between the output and ground of described sensing unit.
15. humidity sensors according to claim 4, it is characterised in that described humidity sensor
The outer protected set of described circuit region.
16. 1 kinds of humidity measuring instruments, it is characterised in that including:
Humidity sensor, uses the humidity sensor described in claim 1-claim 15 any one；
Mounting frame for sensor, described mounting bracket is used for being arranged in test environment described humidity sensor,
Ensure that the installation site of described humidity sensor, angle are similar to the plant leaf blade in described test environment；
Sensor detection node, described sensor test node provides electric energy for described humidity sensor, and connects
Receive the Humidity Detection signal that described humidity sensor passes over, export after treatment；
Cable, described cable is in order to connect described humidity sensor and described sensor detection node.
17. humidity measuring instruments according to claim 16, it is characterised in that described sensor detects
Node includes:
Analog-to-digital conversion module, the Humidity Detection that described humidity sensor is passed over by described analog-to-digital conversion module
Signal is converted into digital signal；
Central processing module, described central processing module is according to predetermined test program, to described humidity sensor
Device sends testing requirement, and is processed by the humidity data obtained in the detection cycle；
Power module, described power module is described sensor test node and described humidity sensor energy supply；
Wireless communication module, the humidity data that described wireless communication module will obtain from described central processing module
It is sent to distance host, and receives the instruction of described distance host.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620227992.6U CN205506739U (en) | 2016-03-23 | 2016-03-23 | Humidity sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106600937A (en) * | 2017-01-10 | 2017-04-26 | 中山市晶威电子科技有限公司 | Electric appliance achieving measuring signal wireless transmission between base and appliance body |
| CN107228882A (en) * | 2016-03-23 | 2017-10-03 | 北京科百宏业科技有限公司 | A kind of humidity sensor |
| CN110168357A (en) * | 2017-01-11 | 2019-08-23 | Lg电子株式会社 | Sensor |
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2016
- 2016-03-23 CN CN201620227992.6U patent/CN205506739U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107228882A (en) * | 2016-03-23 | 2017-10-03 | 北京科百宏业科技有限公司 | A kind of humidity sensor |
| CN106600937A (en) * | 2017-01-10 | 2017-04-26 | 中山市晶威电子科技有限公司 | Electric appliance achieving measuring signal wireless transmission between base and appliance body |
| CN110168357A (en) * | 2017-01-11 | 2019-08-23 | Lg电子株式会社 | Sensor |
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