CN107976469A - A kind of soil nutrient device for fast detecting based on Artificial Olfactory - Google Patents
A kind of soil nutrient device for fast detecting based on Artificial Olfactory Download PDFInfo
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- CN107976469A CN107976469A CN201711188439.1A CN201711188439A CN107976469A CN 107976469 A CN107976469 A CN 107976469A CN 201711188439 A CN201711188439 A CN 201711188439A CN 107976469 A CN107976469 A CN 107976469A
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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
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
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Abstract
A kind of soil nutrient device for fast detecting based on Artificial Olfactory belongs to detecting instrument；Including straight type joint, funnel type joint, source of the gas selector valve, drying tube, L-type air inlet tube, closed inspection air cavity pipeline, temperature modulation module, L-type vent connection, asepwirator pump, gas sensor array, signal conditioning circuit and embedded processing module；The present invention realizes the detection of soil odour component using the characteristic of the metal-oxide film selective absorption to mixed gas at different temperatures；The disposable collection of multigroup detection data is realized by designing sensor array, the drawbacks of being influenced which solves current soil nutrient quick determination method by soil moisture content, the soil texture and soil grades, realize the quick, accurate of soil nutrient, Non-Destructive Testing.
Description
Technical field
The invention belongs to detecting instrument equipment, and in particular to a kind of soil nutrient based on Artificial Olfactory quickly detects dress
Put.
Background technology
The quick detection of soil nutrient plays an important roll in fertilization compositions based on earth measurement.The basis of fertilization compositions based on earth measurement is exactly
Soil Nutrient Characteristics And Its Spatial Variability distribution map, and quick, the real-time detection of soil nutrient is always the technical bottleneck of modern agriculture so that
The popularization of Formula fertilization by soil testing is subject to serious restriction.Traditional soil nutrient detection is analyzed using laboratory chemical
Method, there are the problems such as sample collection is difficult, analysis yields poor results, testing cost is high.
Develop rapidly electrochemistry, electromagnetic technique, laser technology, spectral technique support under, more and more new skills
Art is applied to the detection, and achieve good prediction effect in real time of soil nutrient scene.Such as ion-selective electrode electrochemistry
Sensor, method, soil conductivity Indirect Determination, spectrum quick determination method etc..The greatest problem that presently, there are is：How
Eliminate the influence that the factors such as soil moisture content, quality and granularity detect soil nutrient.
Smell is one of key property of material, is capable of the essence of representative species.Smell caused by material is exactly external
Boundary propagates the information of its substantive characteristics, the smell of material most can representative species essence.Experienced pedologist is frequently utilized that
The smell of soil judges the quality of soil property.At present odor detection method mainly have conventional method, Biologic Olfaction method and manually
Three kinds of smell method.Conventional method, such as red, orange, green, blue, yellow (ROGBY) etc., it is difficult to distinguish classification and content that smell is integrally included；It is raw
Thing smell method has superior detection performance, but is not suitable for the detection of hazardous gas, and is easily influenced by subjective emotion；
Artificial Olfactory method, such as electronic nose etc., are designed by mimic biology olfactory system, and it is excellent not only to possess Biologic Olfaction detection
Gesture, and influenced from subjective differences.
The content of the invention
The purpose of the present invention is exactly to solve the deficiency of existing soil nutrient detection technique, there is provided one kind is based on manually smelling
The soil nutrient device for fast detecting of feel, measures, for fertilization compositions based on earth measurement the quick, real-time, accurate of soil nutrient with reaching
Implementation provide technical support purpose.
What the purpose of the invention was realized in：The closed inspection air cavity that forms is being sequentially connected in series by multiple semi-circular tubes
Installation L-type air inlet tube is respectively communicated with the initial and end end of pipeline and L-type vent connection, source of the gas selector valve pass through drying tube and L
Type air inlet tube connects, and straight type joint is corresponded with two air inlets of source of the gas selector valve and connected respectively with funnel type joint, L
Type vent connection is connected with asepwirator pump, in the connecting interface of L-type air inlet tube and L-type vent connection and closed inspection air cavity pipeline
What is respectively rotatably controlled at adjacent semi-circular tube connecting interface in place and closed inspection air cavity pipeline is in upright or horizontal vertical shape
The installation air film annulus of state, installation gas is respectively configured on each semi-circular tube internal face of closed inspection air cavity pipeline and outside wall surface
Body sensor array and temperature modulation module, the temperature modulation module respectively with gas sensor array and signal conditioning circuit
Connection, gas sensor array are connected with signal conditioning circuit, the signal conditioning circuit, source of the gas selector valve, asepwirator pump difference
It is connected with embedded processing module, so far forms a kind of soil nutrient device for fast detecting based on Artificial Olfactory.
The present invention is using Artificial Olfactory mechanism as theoretical foundation, using metal-oxide film at different temperatures to gaseous mixture
The selective absorption characteristic of body, realizes soil smell composition detection, and designs disposable complete repeatedly by sensor array column
Sampling operation, realizes quick, the real-time measurement of soil nutrient.Apparatus of the present invention overcome soil moisture content, soil grades etc.
Influence to accuracy of detection, technical support is provided for the implementation of fertilization compositions based on earth measurement.
Brief description of the drawings
Fig. 1 is a kind of soil nutrient device for fast detecting general structure schematic diagram based on Artificial Olfactory；
Fig. 2 is gas sensor array structure diagram；
Fig. 3 is the gas sensor configuration schematic diagram in gas sensor array；
Fig. 4 is gas sensor output signal conditioning process structure diagram；
Fig. 5 is a kind of soil nutrient device for fast detecting work flow diagram based on Artificial Olfactory
Fig. 6 is air film circular ring structure schematic diagram；
Fig. 7 is dynamic response curve figure of the gas sensor to smell pulse.
Piece number explanation in figure：
1st, straight type joint, 2, funnel type joint, 3, source of the gas selector valve, 4, drying tube, 5, L-type air inlet tube, 6, air film circle
Ring, 7, closed inspection air cavity pipeline, 8, gas sensor array, 9, temperature modulation module, 10, L-type vent connection, 11, air-breathing
Pump, 12, signal conditioning circuit, 13, embedded processing module, 14, ceramic tube, 15, output electrode, 16, metal-oxide film,
17th, heating wire, 18, gas sensor, 19, mounting hole, 20, arc substrate plate, 21, heating wire group, 22, bridge circuit, 23, survey
Measure amplifying circuit, 24, sampling hold circuit, 25, analog to digital conversion circuit, 26, dsp processor, 27, display, 28, memory,
29th, push-button unit, 30, communication interface, 31, metal ring, 32, ventilated membrane/pellicle, 33, installation circular hole.
Embodiment
The invention embodiment is described in detail below in conjunction with the accompanying drawings.A kind of soil based on Artificial Olfactory is supported
Divide device for fast detecting, on the initial and end end of the closed inspection air cavity pipeline 7 formed is sequentially connected in series by multiple semi-circular tubes respectively
Connection installation L-type air inlet tube 5 and L-type vent connection 10, source of the gas selector valve 3 are connected by drying tube 4 with L-type air inlet tube 5,
Straight type joint 1 is corresponded with two air inlets of source of the gas selector valve 3 and connected respectively with funnel type joint 2, L-type vent connection 10
Connected with asepwirator pump 11, at the connecting interface of L-type air inlet tube 5 and L-type vent connection 10 with closed inspection air cavity pipeline 7,
And what is respectively rotatably controlled at the adjacent semi-circular tube connecting interface on closed inspection air cavity pipeline 7 is in upright or horizontal vertical state
Installation air film annulus 6, installation gas is respectively configured on each semi-circular tube internal face of closed inspection air cavity pipeline 7 and outside wall surface
Body sensor array 8 and temperature modulation module 9, the temperature modulation module 9 respectively with gas sensor array 8 and signal condition
Circuit 12 connects, and gas sensor array 8 is connected with signal conditioning circuit 12, the signal conditioning circuit 12, source of the gas selector valve
3rd, asepwirator pump 11 is connected with embedded processing module 13 respectively.The structure of the gas sensor array 8 is：In arc substrate plate
Multiple mounting holes 19 are set gradually on 20, multiple gas sensors 18 pass sequentially through multiple mounting holes 19 and are packed in arc substrate plate
On 20；The gas sensor 18 is made of ceramic tube 14, metal-oxide film 16, heating wire 17 and output electrode 15, institute
Stating metal-oxide film 16, uniformly containing is covered on 14 outer surface of ceramic tube, and heating wire 17 is matched somebody with somebody through 14 die of ceramic tube
Dress, two output electrodes 15 are connected on 14 both ends of ceramic tube, and multiple heating wire 17 are sequentially connected in series composition gas sensing
The heating wire group 21 of device array 8.The signal conditioning circuit 12 includes bridge circuit 22, the measuring and amplifying electricity being connected with each other successively
Road 23, sampling hold circuit 24 and analog to digital conversion circuit 25, the output electricity of the gas sensor 18 of the gas sensor array 8
Pole 15 is connected with bridge circuit 22.The embedded processing module 13 includes dsp processor 26, display 27, memory 28, presses
Key unit 29 and communication interface 30, the dsp processor 26 respectively with asepwirator pump 11, display 27, memory 28, push-button unit
29th, communication interface 30 and source of the gas selector valve 3, signal conditioning circuit 12 connect；Set in the dsp processor 26 at digital signal
Manage program and gas analysis recognizer；Push-button unit 29 is human-computer interaction interface, including start button, inspection gas button, gas washing
Button and power-off button.The air film annulus 6 is made of ventilated membrane/pellicle 32 and the assembling of metal ring 31, and the ventilated membrane/
Pellicle 32 is packed in inside metal ring 31, and two installation circular holes 33 are uniformly arranged in the 31 outer portion of metal ring,
Described two installation circular holes 33 coordinate with closed 7 internal face installation of inspection air cavity pipeline.
The workflow of apparatus of the present invention is：
(1) warm-up operation：Push button the start button of unit 29, dsp processor 26 according in different detection zones to inspection
The needs of testing temperature, exportable a variety of default temperature modulation signal functions are fast in temperature modulation module 9, temperature modulation module 9
Speed heating heating wire group 21, makes up to default operating temperature.
(2) scrubbing operations：The gas washing button of unit 29 is pushed button, source of the gas selector valve 3 is connected with straight type joint 1, at DSP
Reason device 26 automatically adjusts air film annulus 6 and is allowed to be in horizontal vertical state, and dsp processor 26 exports modulated signal at the same time makes asepwirator pump 11
Air-breathing speed be in fast state；Under the effect of asepwirator pump 11, air flows fast through straight type joint 1, source of the gas selector valve successively
3rd, drying tube 4, air inlet tube 5, closed inspection air cavity pipeline 7 and L-type vent connection 10；The gas washing time can be according to closed inspection air cavity
The cavity length setting of body pipeline 7, usually, if the detection zone quantity of closed inspection air cavity pipeline 7 is less than 10, during gas washing
Between can control in 30s or so；Gas washing can not only eliminate remaining under test gas in closed inspection air cavity pipeline 7, may be used also
Think that the collection of baseline value is prepared.
(3) baseline value gathers：Gas sensor 18 inevitably results from drift phenomenon in use, in order to carry
High measurement accuracy rate, needs to measure the baseline value Z of gas sensor 18 before every time detecting under test gasij(0), drifted about with realizing
Compensation；Baseline value Zij(0) corresponding correction value X can be produced after signal conditioning circuit 12ij(0)。
(4) gas operation is examined：The inspection gas button of unit 29 is pushed button, source of the gas selector valve 3 is connected with funnel type joint 2, DSP
Processor 26 automatically adjusts air film annulus 6 and is allowed to be in erectility, while asepwirator pump 11 is in tick-over state；Inhaling
Under air pump 11 acts on, under test gas is gradually spread to each detection zone, when flowing through air film annulus 6, by ventilated membrane/pellicle 32
Influence, the diffusion velocity of different scent molecules in the cavity is different under test gas, causes their different inspections in the cavity
There are component and concentration difference in gas area；There are the gas sensor in the scent molecule and detection zone of component and concentration difference for these
After 18 contacts, 18 output resistance signal Z of gas sensor can be madeij(t), resistance signal Zij(t) produced after signal conditioning circuit 12
Raw digital signal Xij(t)。
(5) Signal Pretreatment：Digital signal preprocessor is integrated with dsp processor 26 to believe the numeral collected
Number it is filtered, the operation of Baseline wander, Feature selection and extraction.
Digital filtering processing, that is, for each sampled point in each detection zone, uses it using mean filter method
Average value in neighborhood replaces the sampled point；The influence that digital filtering processing can weaken airborne noise and hardware disturbs in itself,
Improve signal-to-noise ratio.
Baseline wander uses calculus of finite differences：
Yij(t)=(Xij(t)+δA)-(Xij(0)+δA)=Xij(t)-Xij(0)
In formula, Yij(t) it is the data value after Baseline wander, δAFor additive noise or drift；It will thus be seen that additivity is made an uproar
Sound or drift in subtraction is eliminated.
Feature selecting：To pretreated data Yij(t) using be maximized, minimum value, integrated value and average differential value
As data set features.
Feature extraction：Dimension-reduction treatment is carried out using Principal Component Analysis to the data set features produced after feature selecting, is obtained
To comprehensive characteristics.
(6) Classification and Identification：Dsp processor has been internally integrated classification and identification algorithm, which is established using BP neural network
Soil smell Classification and Identification model, can using step (5) obtained comprehensive characteristics as mode input, then according to dimensionality reduction after
Visualization result and sample components/concentration grade classification, obtain the component and concentration information of soil smell to be measured, finally
The component of acquisition and concentration information are exported as model.
Claims (5)
- A kind of 1. soil nutrient device for fast detecting based on Artificial Olfactory, it is characterised in that：Gone here and there successively by multiple semi-circular tubes Connect be respectively communicated with the initial and end end of the closed inspection air cavity pipeline (7) of composition installation L-type air inlet tube (5) and L-type be vented connect Manage (10), source of the gas selector valve (3) is connected by drying tube (4) with L-type air inlet tube (5), straight type joint (1) and funnel type joint (2) correspond and connect with two air inlets of source of the gas selector valve (3) respectively, L-type vent connection (10) connects with asepwirator pump (11) It is logical, it is at the connecting interface of L-type air inlet tube (5) and L-type vent connection (10) with closed inspection air cavity pipeline (7) and closed The peace in upright or horizontal vertical state respectively rotatably controlled at adjacent semi-circular tube connecting interface on inspection air cavity pipeline (7) Air film annulus (6) is filled, installation gas is respectively configured on each semi-circular tube internal face of closed inspection air cavity pipeline (7) and outside wall surface Body sensor array (8) and temperature modulation module (9), the temperature modulation module (9) respectively with gas sensor array (8) and Signal conditioning circuit (12) connects, and gas sensor array (8) is connected with signal conditioning circuit (12), the signal conditioning circuit (12), source of the gas selector valve (3), asepwirator pump (11) are connected with embedded processing module (13) respectively.
- A kind of 2. soil nutrient device for fast detecting based on Artificial Olfactory according to claim 1, it is characterised in that：Institute Stating the structure of gas sensor array (8) is：Multiple mounting holes (19), multiple gases are set gradually on arc substrate plate (20) Sensor (18) passes sequentially through multiple mounting holes (19) and is packed on arc substrate plate (20)；The gas sensor (18) is by making pottery Porcelain tube (14), metal-oxide film (16), heating wire (17) and output electrode (15) are formed, the metal-oxide film (16) uniformly distributed containing is covered on ceramic tube (14) outer surface, and heating wire (17) is equipped with through ceramic tube (14) die, and two defeated Go out electrode (15) to be connected on ceramic tube (14) both ends, multiple heating wire (17), which are sequentially connected in series, forms gas sensor battle array Arrange the heating wire group (21) of (8).
- A kind of 3. soil nutrient device for fast detecting based on Artificial Olfactory according to claim 1, it is characterised in that：Institute The bridge circuit (22), measuring and amplifying circuit (23), sampling that stating signal conditioning circuit (12) includes being connected with each other successively keep electricity Road (24) and analog to digital conversion circuit (25), the output electrode (15) of the gas sensor (18) of the gas sensor array (8) It is connected with bridge circuit (22).
- A kind of 4. soil nutrient device for fast detecting based on Artificial Olfactory according to claim 1, it is characterised in that：Institute Stating embedded processing module (13) includes dsp processor (26), display (27), memory (28), push-button unit (29) and leads to Believe interface (30), the dsp processor (26) respectively with asepwirator pump (11), display (27), memory (28), push-button unit (29), communication interface (30) and source of the gas selector valve (3), signal conditioning circuit (12) connection；Set in the dsp processor (26) DSP program and gas analysis recognizer；Push-button unit (29) is human-computer interaction interface, including start button, inspection Gas button, gas washing button and power-off button.
- A kind of 5. soil nutrient device for fast detecting based on Artificial Olfactory according to claim 1, it is characterised in that：Institute State air film annulus (6) to be made of ventilated membrane/pellicle (32) and metal ring (31) assembling, the ventilated membrane/pellicle (32) It is internal to be packed in metal ring (31), two installation circular holes (33), institute are uniformly arranged in the metal ring (31) outer portion Two installation circular holes (33) are stated with closed inspection air cavity pipeline (7) internal face installation to coordinate.
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| CN201711188439.1A CN107976469A (en) | 2017-11-16 | 2017-11-16 | A kind of soil nutrient device for fast detecting based on Artificial Olfactory |
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| CN201711188439.1A CN107976469A (en) | 2017-11-16 | 2017-11-16 | A kind of soil nutrient device for fast detecting based on Artificial Olfactory |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110954532A (en) * | 2019-11-28 | 2020-04-03 | 吉林大学 | Soil nutrient detection device based on visual smell sense |
| CN110954572A (en) * | 2019-11-28 | 2020-04-03 | 吉林大学 | Soil nutrient detection device based on thermal cracking and artificial olfaction |
| CN111398377A (en) * | 2020-04-16 | 2020-07-10 | 北方工业大学 | Gas environment monitoring system and method for rail transit station |
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| US6368558B1 (en) * | 2000-03-21 | 2002-04-09 | The Board Of Trustees Of The University Of Illinois | Colorimetric artificial nose having an array of dyes and method for artificial olfaction |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110954532A (en) * | 2019-11-28 | 2020-04-03 | 吉林大学 | Soil nutrient detection device based on visual smell sense |
| CN110954572A (en) * | 2019-11-28 | 2020-04-03 | 吉林大学 | Soil nutrient detection device based on thermal cracking and artificial olfaction |
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| CN111398377A (en) * | 2020-04-16 | 2020-07-10 | 北方工业大学 | Gas environment monitoring system and method for rail transit station |
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