CN108627619A - A kind of portable electric nose quickly detected for animalsderived feedstuffs freshness - Google Patents
A kind of portable electric nose quickly detected for animalsderived feedstuffs freshness Download PDFInfo
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- CN108627619A CN108627619A CN201810717531.0A CN201810717531A CN108627619A CN 108627619 A CN108627619 A CN 108627619A CN 201810717531 A CN201810717531 A CN 201810717531A CN 108627619 A CN108627619 A CN 108627619A
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- 238000001514 detection method Methods 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 14
- 238000009434 installation Methods 0.000 claims description 37
- 238000004140 cleaning Methods 0.000 claims description 20
- 238000004887 air purification Methods 0.000 claims description 18
- 238000007781 pre-processing Methods 0.000 claims description 12
- 238000010943 off-gassing Methods 0.000 claims description 10
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 8
- 229910052744 lithium Inorganic materials 0.000 claims description 8
- 230000000087 stabilizing effect Effects 0.000 claims description 8
- 230000036772 blood pressure Effects 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 4
- 238000013480 data collection Methods 0.000 claims 1
- 230000006837 decompression Effects 0.000 claims 1
- 230000008676 import Effects 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 5
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000001914 filtration Methods 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 3
- 210000001331 nose Anatomy 0.000 abstract 3
- 239000007789 gas Substances 0.000 description 76
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 8
- 239000004810 polytetrafluoroethylene Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000004044 response Effects 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- -1 polytetrafluoroethylene Polymers 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 239000011664 nicotinic acid Substances 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 235000019733 Fish meal Nutrition 0.000 description 2
- 238000003556 assay Methods 0.000 description 2
- 239000001273 butane Substances 0.000 description 2
- 208000002925 dental caries Diseases 0.000 description 2
- 239000004467 fishmeal Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 2
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- 239000001294 propane Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 240000007651 Rubus glaucus Species 0.000 description 1
- 235000011034 Rubus glaucus Nutrition 0.000 description 1
- 235000009122 Rubus idaeus Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 235000021028 berry Nutrition 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 230000000050 nutritive effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000003909 pattern recognition Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0044—Sulphides, e.g. H2S
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0047—Organic compounds
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Combustion & Propulsion (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Abstract
The invention discloses a kind of portable electric noses quickly detected for animalsderived feedstuffs freshness, including power supply module, display module, control process memory module, data acquisition module, drive module and detection module, power supply module is used to power to entire electronic nose, display module carries out interface operation and shows collected data, and control process memory module carries out data processing storage and control process；Data acquisition module is acquired, amplifies to the electric signal of sensor, filtering and AD conversion；Control process memory module controls the pump and solenoid valve of detection module by drive module；Detection module is detected the smell product of animalsderived feedstuffs using the detector of pipe-line system, pump, solenoid valve and belt sensor, is chemically reacted by sensor and gas odor, and the variation of resistance of sensor is caused, to obtain electric signal.The electronic nose is simple in structure, operate with easy to carry, high sensitivity, testing result is accurate and reliable.
Description
Technical field
The present invention relates to freshness detection technique fields, and in particular to one kind is quickly examined for animalsderived feedstuffs freshness
The portable electric nose of survey.
Background technology
Bionic olfactory technology is novel agricultural product quality analysis, identification and detection technique developed in recent years, it
It is to pass through fingerprint to being detected by the volatile flavor of sample using the gas sensor array with cross-sensitivity
Collection of illustrative plates is identified and quantifies detected gas, the Global Information (also referred to as " finger-print " data) of sample is obtained, to real
The detection and identification of existing sample.
Foreign countries are mainly used in the food volatility gas such as drinks, tealeaves, fish and meat to the research Showed Very Brisk of bionic olfactory
In the identification and classification of taste, the purpose is to carry out quality grading with freshness to differentiate.
The operation principle of electronic nose is exactly that the detection of sample gas is realized using bionic olfactory technology, and then to product
Quality is assessed.Although the application of electronic nose in recent years is very extensive, there are still prodigious problems, for example, electronics
Nose is not bulky portable, expensive, and existing electric nasus system significant portion must also rely on PC machine, and use is not square
Just, inconvenient to carry, although both at home and abroad there are also portable electric nose product, which is unfavorable for electronics
The further genralrlization of nose product and use.
It is also fewer for the research of portable electric nose at home at present, it is directed to the electronics of animalsderived feedstuffs research
Nose is even more few few, at present for the detection of animalsderived feedstuffs quality mainly using near infrared spectrum to its conventional ingredient
Detection and feed detection of adulterations, to the on the contrary seldom of its freshness detection, and freshness is bigger to its qualitative effects.It is dynamic
Object source feed is because corruption and oxidative rancidity easily occur with higher protein content for it, so as to cause under its nutritive value
Drop, influences the safety of feed product, and then influence the health and safety of animals and humans, so for animalsderived feedstuffs
For, it is vital to detect its freshness, and Evaluation: Current its freshness still relies on some more original methods,
Such as artificial sense and chemical assay.Artificial sense is to judge that smell, rancidity or putrefactive odor etc. judge that it is new by the smell of people
Fresh degree, simple and practicable but shortage objectivity.Judge animalsderived feedstuffs using chemical gauging TVB-N and AV content
Freshness, need before the assay to sample carry out pre-treatment, process is cumbersome, labor intensive and material resources.
Invention content
In order to solve the above-mentioned problems of the prior art, the present invention provides one kind being used for animalsderived feedstuffs freshness
The portable electric nose quickly detected, the electronic nose is simple in structure, small, easy to use and carry, high sensitivity, detection knot
Fruit is accurate and reliable.
Realize that advantages and advantages of the invention are：
A kind of portable electric nose quickly detected for animalsderived feedstuffs freshness, including power supply module, display mould
Block, control process memory module, data acquisition module, drive module and detection module,
Detection module includes cleaning branch pipeline, detection branch pipeline, inlet manifold, detector, escape pipe and temperature and humidity sensing
Device, cleaning branch pipeline include cleaning pipe, the first air purification bottle and the first solenoid valve, and the first air purification bottle exports and cleaning pipe
Entrance is connected to, and the first solenoid valve is installed in cleaning pipe, and detection branch pipeline includes the second air purification bottle, sample placement bottle and inspection
Test tube, the outlet of the second air purification bottle are placed bottle entrance with sample and are connected to, and sample is placed bottle outlet and is connected to detection tube inlet, the
Two solenoid valves are installed in detection pipe, and detection pipe and cleaning pipe outlet are connect with inlet manifold's entrance, are equipped on inlet manifold
Micro air pump；
Detector includes upper shell, centerbody, lower housing and sensor array, and sensor array includes multiple sensors,
Upper shell is in regular prism shape, and the first installation cavity of regular prism shape is offered in upper shell, and each flanking central of upper shell opens up respectively
There are mounting hole, each mounting hole to be connected to the first installation cavity, the number of sensor is identical as the number of upper casing body side surface, each to sense
Device is respectively arranged in each mounting hole, upper shell top surface be equipped with gas outlet, centerbody be in regular prism shape, the size of centerbody with
The size of first installation cavity matches, and venthole is offered in the end face center of centerbody, is opened up in the bottom center of centerbody
There are air admission hole, centerbody to be uniformly provided with multiple gas passages, the number of the number and center body side surface of gas passage along its surface
Equal, each gas passage sequentially passes through the top surface, each side and bottom surface of centerbody, the both ends of each gas passage respectively with air admission hole
It is connected to venthole, centerbody is installed in the first installation cavity, and centerbody and the first installation cavity are interference fitted, each gas passage point
It is not connected to mounting hole corresponding thereto, air inlet is connected to air admission hole, and lower housing center is equipped with air inlet, and lower housing is fixed on
On upper shell, gas outlet is connected to venthole；
Inlet manifold outlet is connected to air inlet, and escape pipe is connect with gas outlet；
First solenoid valve, second solenoid valve and micro air pump are electrically connected with drive module, each sensor and data acquisition module
Block is electrically connected, and display module, data acquisition module, drive module and Temperature Humidity Sensor are electric with control process memory module respectively
Connection, power supply module are electrically connected with display module and control process memory module respectively.
Gas passage is in " [" shape, each gas passage are located on the plane of symmetry of centerbody short transverse, each gas passage
It is made of lower air inlet duct, intermediate detection slot and upper outgassing groove, the upper outgassing groove of each gas passage is located on the top surface of centerbody, respectively
The outlet end of the upper outgassing groove of gas passage is connected to venthole, and it is each that the intermediate detection slot of each gas passage is located at centerbody
The lower air inlet duct of the middle of side, each gas passage is located on the bottom surface of centerbody, the lower air inlet duct of each gas passage into
Mouth end is connected to air admission hole.
The second installation cavity, the shape of lower housing, shape, the size of size and the second installation cavity are offered on upper shell bottom surface
Match, the first installation cavity and the connection of the second installation cavity, lower housing are installed in the second installation cavity, lower housing and the second installation cavity
Interference fit.
Lower housing and the second installation cavity are in the form of annular discs, and air inlet and gas outlet are cylindrical, and air admission hole and venthole are
Circular hole.
The upper shell and centerbody is in positive ten prism-shaped, and mounting hole has ten, and mounting hole is circular hole, wherein five
Mounting hole is big mounting hole, and in addition five mounting holes are small mounting hole, and the diameter of big mounting hole is more than the diameter of small mounting hole, greatly
Mounting hole and small mounting hole are interspersed, and sensor has ten, wherein five are six pin sensors, in addition five are four pins
Sensor, five six pin sensors are respectively arranged in five big mounting hole, and five four pin sensors are respectively arranged in five
In a small mounting hole.
It is uniformly provided with four handrails on lower housing outer end face, handrail is in prism-shaped, and four handrails are square distribution.
Gas flowmeter is installed, gas flowmeter entrance is connected with micro air pump outlet on gas main.
Escape pipe is equipped with check valve.
Control process memory module includes Raspberry Pi, and display module includes display screen, and data acquisition module includes ARPI600
Data acquisition module and signal pre-processing circuit, each sensor are connect with signal pre-processing circuit respectively, signal pre-processing circuit
Connect with ARPI600 data acquisition modules, drive module includes solid-state relay and two-way relay, solid-state relay with it is miniature
Air pump connects, and two-way relay is connect with the first solenoid valve and second solenoid valve respectively, and power supply module includes 24V lithium batteries and drop
Voltage stabilizing module, 24V lithium batteries is pressed to be respectively Raspberry Pi and display screen power supply by lowering and stabilizing blood pressure module, while being also the first electromagnetism
Valve, second solenoid valve and micro air pump power supply, ARPI600 data acquisition modules, display screen, two-way relay and solid-state relay
It is connect respectively with Raspberry Pi.
Compared with prior art, advantages and advantages of the invention are：
1, compared with existing electronic nose, which uses pump suction type sample mode, with common free diffusing formula phase
Than, response and recovery time are shortened, and free diffusing formula mode can not clean automatically but Manual-cleaning, it is number
It is tired, and this electronic nose is using clean air, and free diffusing mode cleaning sensor is surrounding air, it can shadow
Ring testing result.
2, the electronic nose uses graphic interface programming, uses the larger LCD display of area, can show more
Sample message and interface operation, compared with mechanical key mode, the operation is more convenient, and circuit is simpler.
3, when being detected, when sample gas is with sensor contacts, each sensor corresponds to one solely to detector respectively
Vertical gas chamber ensures not interfereing with each other between each sensor, improve each sensor to the synchronisms of sample gas examinations and
Uniformity, each sensor independently reacts with sample gas, to prevent the cross influence between each sensor, while being also to protect
Card sample gas comes into full contact with sensor, reduces response and recovery time, improves sensitivity.
4, the electronic nose is at low cost, small, and portability is strong, and interface operation is simple, and accuracy is high.
Description of the drawings
Fig. 1 is the structural schematic diagram of the portable electric nose quickly detected for animalsderived feedstuffs freshness.
Fig. 2 is the structural schematic diagram of detector.
Fig. 3 is the sectional view of Fig. 2.
Fig. 4 is the structural schematic diagram of upper shell.
The structural schematic diagram of body centered on Fig. 5.
Fig. 6 is the structural schematic diagram of lower housing.
Fig. 7 is the automatically controlled drawing of the portable electric nose quickly detected for animalsderived feedstuffs freshness.
Wherein, in the big mounting holes of 1-, 2- lower housings, 3- air inlets, 4- gas passages, the small mounting holes of 5-, the gas outlets 6-, 7-
Air inlet duct, 12- intermediate detections slot, the upper outgassing grooves of 13-, 14- tetra- under heart body, 8- upper shells, 9- air admission holes, 10- ventholes, 11-
Pin sensor, six pin sensors of 15-, the first installation cavitys of 16-, the second installation cavitys of 17-, 18- handrails, 19- cleaning pipes, 20-
First air purification bottle, the first solenoid valves of 21-, the second air purification of 22- bottle, 23- samples place bottle, 24- detection pipes, 25- the
Two solenoid valves, 26- detectors, 27- escape pipes, 28- micro air pumps, 29- check valves, 30- inlet manifold, 31- gas flowmeters.
Specific implementation mode
The present invention is described in detail below in conjunction with the accompanying drawings.
Provided by the present invention for the structural schematic diagram for the portable electric nose that animalsderived feedstuffs freshness quickly detects
As shown in Figure 1, the electronic nose includes power supply module, display module, control process memory module, data acquisition module, driving mould
Block and detection module.
Detection module includes cleaning branch pipeline, detection branch pipeline, inlet manifold 30, detector 26, escape pipe 27 and warm and humid
Spend sensor.It includes cleaning pipe 19, the first air purification bottle 20 and the first solenoid valve 21, the first air purification bottle to clean branch pipeline
20 outlets are connected to 19 entrance of cleaning pipe, and the first solenoid valve 21 is installed in cleaning pipe.It includes that the second air is net to detect branch pipeline
Change bottle 22 and sample places bottle 23, detection pipe 24, the outlet of the second air purification bottle 22 is placed 23 entrance of bottle with sample and is connected to, sample
It places the outlet of bottle 23 to be connected to detection tube inlet, on 25 installation and detection pipe 24 of second solenoid valve.First air purification bottle, 20 He
Activated carbon is respectively provided in second air purification bottle 22, the air detected in environment is empty through the first air purification bottle and second respectively
Activated carbon in gas purification bottle is purified.Detection pipe 24 and the outlet of cleaning pipe 19 are connect with 30 entrance of inlet manifold, and air inlet is total
28 and gas flow meter 31 of micro air pump is installed, 31 entrance of gas flowmeter is connected with the outlet of micro air pump 28 on pipe 30.It is micro-
Type air pump uses FKY8006 type micro air pumps, effect that sample gas to be detected or pure air are sucked detector, respectively
It is detected the cleaning with pipeline, the average flow rate of the pump is 3.5L/min, can gas be drawn to detector completely.Gas stream
Gauge uses glass rotameter, is used for monitoring current flow status, also is used for adjusting the stream of entire electronic nose air inlet
Amount.
The structure of detector is as shown in Figures 2 and 3, including upper shell 8, centerbody 7, lower housing 2 and sensor array.On
The material of shell 8, centerbody 7 and lower housing 2 is polytetrafluoroethylene (PTFE), polytetrafluoroethylene (PTFE) have high temperature resistant, it is corrosion-resistant, do not glue
The features such as attached, electrical insulating property, good ageing resistance and leakproofness, is highly suitable for making the detector.
As shown in figure 4, upper shell 8 is in positive ten prism-shaped, axially offered successively in regular prism shape along it inside upper shell
The first installation cavity 16 and the second installation cavity 17 in the form of annular discs, the first installation cavity 16 be connected to the second installation cavity 17.Upper shell 8
Ten sides on opened up respectively there are five big mounting hole 1 and five small mounting holes 5, big mounting hole 1 and small mounting hole 5 are circle
Hole, the diameter of big mounting hole 1 are more than the diameter of small mounting hole 5, and big mounting hole 1 and small mounting hole 5 are interspersed.Upper shell 8 pushes up
Face center is equipped with gas outlet 6, and air inlet 3 is cylindrical, and in the present embodiment, air inlet internal diameter is 4mm, and outer diameter 8mm is highly
10mm。
Sensor array includes ten gas sensors with cross selectivity, wherein five are four pin sensors
14, model is respectively TGS2600, TGS2620, TGS2602, TGS2610, TGS2611, and in addition five are six pin sensors
15, model is respectively TGS822, MQ136, MQ137, MQ139, TGS813, and TGS822 is organic solvent gas sensor,
MQ136 is these hydrogen sulfide gas sensor, and MQ137 is ammonia gas sensor, and MQ139 is freon/halogen sensor,
TGS2600 is air quality sensor, and TGS2620 is alcohol/solvent gas sensor, and TGS2602 is volatile organic compound
Object and aroma gases sensor, TGS2610 are propane/butane gas sensors, and TGS813 is methane/propane/butane sensor,
TGS2611 is methane gas sensor.Five six pin sensors 15 are installed on five big mounting hole 1 by insulating tape respectively
In, five four pin sensors 14 are installed on by insulating tape in five small mounting holes 5 respectively.Not due to sensor size
One, four pin sensor sizes are smaller, and six pin sensor sizes are larger, divide so four pins and six pin sensors intersect
Cloth, each sensor are all mutual indepedent, can arbitrarily be dismantled.The position of the special installation of sensor, is conducive to whole device
The reduction of volume.After sensor array samples sample smell, the response for obtaining each sensor simultaneously by processor becomes
Change curve, then sensor array is optimized according to specific method, finally obtain the characteristic value of sensor after optimization, comes
The finger print data of sample is obtained, and can be combined with the physical and chemical index of fish meal to obtain fish meal by the response of each sensor
Finger-print information.
As shown in figure 5, centerbody 7 is in positive ten prism-shaped, centerbody 7 is uniformly provided with ten gas passages 4, gas along its surface
Body channel is in " [" shape, each gas passage 4 are located on the plane of symmetry of 7 short transverse of centerbody.Each gas passage 4 under into
Air drain 11, intermediate detection slot 12 and upper outgassing groove 13 are constituted, and the upper outgassing groove 13 of each gas passage 4 is located at the top surface of centerbody 7
On, the outlet end of the upper outgassing groove 13 of each gas passage 4 is connected to venthole 10, and the intermediate detection slot 12 of each gas passage is distinguished
The lower air inlet duct 11 of middle positioned at each side of centerbody, each gas passage 4 is located on the bottom surface of centerbody, each gas passage
The input end of 4 lower air inlet duct 11 is connected to air admission hole.In the present embodiment, gas passage width is 3mm.Each gas passage phase
When in airflow fence, contributing to acquisition of the sensor array to sample gas.
As shown in fig. 6, lower housing 2 is cylindrical, 2 center of lower housing is equipped with air inlet 3, and air inlet 3 is cylindrical, this reality
It applies in example, air inlet internal diameter is 4mm, outer diameter 8mm, is highly 10mm.Four handrails are uniformly provided on 2 outer end face of lower housing
18, handrail 18 is in prism-shaped, and four handrails 18 are square distribution.The effect of handrail is to facilitate the installation and dismounting of lower housing.Into
The height of gas port and gas outlet is 10mm, enters intermediate detection slot to gas and reacts with sensor and has reserved buffering area
Domain enables external pipeline conveniently to be accessed by air inlet and gas outlet, and conveniently with the flowmeter of external pipe, pump, electricity
The components such as magnet valve connect.
Centerbody 7 is installed in the first installation cavity 16, and centerbody 7 and the first installation cavity 16 interference fit are (due to centerbody
It is all made of polytetrafluoroethylene (PTFE) with upper shell, good airproof performance does not need the connecting components such as key), gas outlet 6 is connected to venthole 10,
Each gas passage 4 respectively with corresponding thereto big mounting hole 1 or small mounting hole 5 be connected to.Each sensor and a gas are logical
Road is identical, wherein the distance of four pin gas sensor reaction head distance center body side surfaces is 4mm, six pin gas sensors are anti-
It is 2mm, that is, each sensor and corresponding intermediate detection slot formation one to answer a distance for distance center body side surface
The volume of a independent test chamber, the test chamber is only 0.059L, not only effectively reduces the volume of entire detector, Er Qiegeng
Be conducive to gas to come into full contact with sensor, sensor response is sensitiveer, to improve the sensitivity of detector detection and accurate
Degree.
Lower housing 2 is installed in the second installation cavity 17, and lower housing 2 and the second installation cavity 17 interference fit are (due to lower housing
It is all made of polytetrafluoroethylene (PTFE) with upper shell, good airproof performance does not need the connecting components such as key), air inlet is connected to air admission hole.
The outlet of inlet manifold 30 is connected to air inlet 3, and escape pipe 27 is connect with gas outlet 6, and escape pipe 27 is equipped with unidirectional
Valve 29.Escape pipe is directly communicated to by check valve in air, enters detector to prevent non-purified air return, influences gas biography
The Opening pressure of the accuracy of detection of sensor, this check valve is 0.005Mpa, can be met the requirements.
Temperature Humidity Sensor uses DHT11 type Temperature Humidity Sensors, is used for monitoring current humiture state, is independent
It is existing, it is fixed on electronic nose whole frame.In actual mechanical process, gas sensor is easily by the shadow of ambient temperature and humidity
It rings, for animalsderived feedstuffs in freshness change procedure, the humiture of animalsderived feedstuffs gaseous surrounding environment can also occur one
Fixed variation can both compensate humiture and cause to sensor so temperature and humidity compensation is carried out in pattern-recognition that will be below
Variation, and current humiture can be compensated to changing caused by sample.
Control process memory module use Raspberry Pi, Raspberry Pi is a kind of microprocessor, be one only slightly than credit card
Big mainboard, Raspberry Pi have 4 USB interfaces and one 10/100 using SD/MicroSD cards as memory hard disk around card mainboard
Ethernet interface can connect keyboard, mouse and cable, while possess the TV output interface and HDMI high definitions of video analog signal
Video output interface, and there are I/O mouthfuls.Raspberry Pi has stronger independent data processing capacity, and can be detached from PC machine in movement
It is used for quickly detecting in environment, data preserve also relatively easy.
Display module includes display screen, and display screen uses 7 cun of LCD capacitive touch screens, and has higher resolution ratio, point
Resolution is 1024 × 600.
Data acquisition module includes ARPI600 data acquisition modules and signal pre-processing circuit, signal pre-processing circuit pair
The electric signal of each sensor is captured in sensor array, and is amplified and is filtered.ARPI600 data acquisition modules are trees
A kind of AD of certain kind of berries group expands plate, since the I/O mouths of Raspberry Pi are less, so can greatly save the I/ of Raspberry Pi using the module
O mouthfuls, convenience relay and lowering and stabilizing blood pressure module by signal access in Raspberry Pi, and secondly, which uses the AD in 10,11 channel
Conversion, i.e., receivable data length is 10 every time, and accessible sensor is up to 11, and the biography in sensor array
Sensor is 10, is used enough, and sampling rate is 38KSPS, the odiferous information obtained for acquiring each gas sensor.
Power supply module includes 24V lithium batteries and lowering and stabilizing blood pressure module, and 24V lithium battery parameters are 24V, 6800mAh, lithium electricity
Pond was for entire electronic nose continued power 7 hours.Lowering and stabilizing blood pressure module main function is burning voltage, and 24V voltages are reduced to 5
Volt, due to the power supply electricity of each gas sensor, display screen, ARPI600 data acquisition modules, signal pre-processing circuit and Raspberry Pi
Pressure is all 5V.
As shown in fig. 7,24V lithium batteries are respectively that Raspberry Pi and display screen are powered, while being also by lowering and stabilizing blood pressure module
First solenoid valve, second solenoid valve and micro air pump power supply, and then power for entire electronic nose, using power supply module, make entire
Electronic nose uses a supplying cell group, does not need additional power voltage supply module, has simplified the structure of electronic nose.Sensor array
Each sensor of row is connect with signal pre-processing circuit respectively, and signal pre-processing circuit is connect with ARPI600 data acquisition modules,
ARPI600 data acquisition modules are connect with Raspberry Pi, and signal processing circuit is captured and handled to the electric signal of each sensor,
To treated, electric signal is AD converted ARPI600 data acquisition modules, converts electrical signals into digital signal, ARPI600
Digital data transmission is handled and is stored to Raspberry Pi by data acquisition module.Solid-state relay is connect with micro air pump, Gu
State relay is connect with Raspberry Pi, and micro air pump is controlled by Raspberry Pi by solid-state relay, and high level triggering, low level is closed
It closes.Two-way relay is connect with the first solenoid valve and second solenoid valve respectively, and two-way relay is connect with Raspberry Pi respectively, and first
The break-make of solenoid valve and second solenoid valve is controlled by Raspberry Pi by two-way relay, and low level triggering, high level disconnects.It is warm and humid
Degree sensor is connect with Raspberry Pi, is controlled by Raspberry Pi.Display screen is connect with Raspberry Pi, and the display function of the display screen passes through
HDMI is connected with the HDMI of Raspberry Pi, and touch function is connected by USB port with Raspberry Pi, due to Raspberry Pi I/O mouths compared with
Few, such connection type can't occupy I/O mouths of Raspberry Pi, by clicking the button on graphic interface, can control with
Entire electric nasus system is operated, realizes the function of electronic nose.
The application method of the above-mentioned portable electric nose quickly detected for animalsderived feedstuffs freshness is：
1, it is fitted into sample through animalsderived feedstuffs to be detected to place in bottle, it is gentle to open the first solenoid valve, micro air pump
Flowmeter body closes second solenoid valve, and the air in environment becomes pure air after the first air purification bottle filtration, purification, clean
Net air is inhaled into the effect of micro air pump in each sense channel of detector, is cleaned each sensor, is reached baseline value；
2, the first solenoid valve is closed, opens second solenoid valve, the air in environment is through the second air purification bottle filtration, purification
Become pure air afterwards, the smell product that pure air drives animalsderived feedstuffs to generate under the action of micro air pump enters inspection
It surveys in each sense channel of device, each gas sensor is reacted with the smell product that animalsderived feedstuffs generate, so as to cause
The resistance value of sensor changes, and the electric signal of each sensor is acquired by signal pre-processing circuit, amplifies and filters, then
It is AD converted by ARPI600 data acquisition modules, transformed signal is passed to raspberry by ARPI600 data acquisition modules
Group is stored.
3, the humiture in the real-time monitoring of environmental of Temperature Humidity Sensor, the data transfer of humiture is stored up to Raspberry Pi
It deposits, since gas sensor and sample are easily changed by ambient temperature and humidity, so to measure current humiture, humiture is mended
Repay is exactly also to be modeled the humiture of environment as characteristic value, the response of gas sensor in modeling below
It is characteristic value, along with temperature and humidity value is also characteristic value, is modeled together.
Claims (9)
1. a kind of portable electric nose quickly detected for animalsderived feedstuffs freshness, it is characterised in that：Including mould of powering
Block, display module, control process memory module, data acquisition module, drive module and detection module,
Detection module includes cleaning branch pipeline, detects branch pipeline, inlet manifold, detector, escape pipe and Temperature Humidity Sensor, clearly
It includes cleaning pipe, the first air purification bottle and the first solenoid valve to wash branch pipeline, and the first air purification bottle exports and cleaning tube inlet
Connection, the first solenoid valve are installed in cleaning pipe, and detection branch pipeline includes the second air purification bottle, sample placement bottle and detection
Pipe, the outlet of the second air purification bottle are placed bottle entrance with sample and are connected to, and sample is placed bottle outlet and is connected to detection tube inlet, and second
Solenoid valve is installed in detection pipe, and detection pipe and cleaning pipe outlet are connect with inlet manifold's entrance, are equipped on inlet manifold micro-
Type air pump；
Detector includes upper shell, centerbody, lower housing and sensor array, and sensor array includes multiple sensors, upper casing
Body is in regular prism shape, and the first installation cavity of regular prism shape is offered in upper shell, and each flanking central of upper shell offers peace respectively
Hole is filled, each mounting hole is connected to the first installation cavity, and the number of sensor is identical as the number of upper casing body side surface, each sensor point
It is not installed in each mounting hole, upper shell top surface is equipped with gas outlet, and centerbody is in regular prism shape, the size of centerbody and first
The size of installation cavity matches, and venthole is offered in the end face center of centerbody, offered in the bottom center of centerbody into
Stomata, centerbody are uniformly provided with multiple gas passages along its surface, and the number of gas passage is equal with the number of center body side surface,
Each gas passage sequentially passes through the top surface, each side and bottom surface of centerbody, the both ends of each gas passage respectively with air admission hole and go out
Stomata is connected to, and centerbody is installed in the first installation cavity, centerbody and the first installation cavity interference fit, each gas passage respectively with
Mounting hole connection corresponding thereto, air inlet are connected to air admission hole, and lower housing center is equipped with air inlet, and lower housing is fixed on upper casing
On body, gas outlet is connected to venthole；
Inlet manifold outlet is connected to air inlet, and escape pipe is connected to gas outlet；
First solenoid valve, second solenoid valve and micro air pump are electrically connected with drive module, each sensor and data acquisition module electricity
Connection, display module, data acquisition module, drive module and Temperature Humidity Sensor are electrically connected with control process memory module respectively
It connects.
2. the portable electric nose according to claim 1 quickly detected for animalsderived feedstuffs freshness, feature
It is：Gas passage in " [" shape, each gas passage are located on the plane of symmetry of centerbody short transverse, each gas passage by
Lower air inlet duct, intermediate detection slot and upper outgassing groove are constituted, and the upper outgassing groove of each gas passage is located on the top surface of centerbody, each gas
The outlet end of the upper outgassing groove in body channel is connected to venthole, and the intermediate detection slot of each gas passage is located at each side of centerbody
The lower air inlet duct of the middle in face, each gas passage is located on the bottom surface of centerbody, the import of the lower air inlet duct of each gas passage
End is connected to air admission hole.
3. the fingerprint data collection device according to claim 1 for the detection of animalsderived feedstuffs freshness, feature
It is：Offer the second installation cavity on upper shell bottom surface, shape, the size phase of the shape, size of lower housing with the second installation cavity
Matching, the first installation cavity and the connection of the second installation cavity, lower housing are installed in the second installation cavity, lower housing and the second installation cavity mistake
It is full of cooperation.
4. the portable electric nose according to claim 3 quickly detected for animalsderived feedstuffs freshness, feature
It is：Lower housing and the second installation cavity are in the form of annular discs, and air inlet and gas outlet are cylindrical, and air admission hole and venthole are circle
Hole.
5. according to any portable electric nose quickly detected for animalsderived feedstuffs freshness of claims 1 or 2,
It is characterized in that：The upper shell and centerbody is in positive ten prism-shaped, and mounting hole has ten, and mounting hole is circular hole, wherein
Five mounting holes are big mounting hole, and in addition five mounting holes are small mounting hole, and the diameter of big mounting hole is more than the straight of small mounting hole
Diameter, big mounting hole and small mounting hole are interspersed, and sensor has ten, wherein five are six pin sensors, in addition five are
Four pin sensors, five six pin sensors are respectively arranged in five big mounting hole, and five four pin sensors are pacified respectively
Loaded in five small mounting holes.
6. the portable electric nose according to claim 1 quickly detected for animalsderived feedstuffs freshness, feature
It is：It is uniformly provided with four handrails on lower housing outer end face, handrail is in prism-shaped, and four handrails are square distribution.
7. the portable electric nose according to claim 1 quickly detected for animalsderived feedstuffs freshness, feature
It is：Gas flowmeter is installed, gas flowmeter entrance is connected with micro air pump outlet on gas main.
8. the portable electric nose according to claim 1 quickly detected for animalsderived feedstuffs freshness, feature
It is：Escape pipe is equipped with check valve.
9. the portable electric nose according to claim 1 quickly detected for animalsderived feedstuffs freshness, feature
It is：Control process memory module includes Raspberry Pi, and display module includes display screen, and data acquisition module includes ARPI600 numbers
According to acquisition module and signal pre-processing circuit, each sensor is connect with signal pre-processing circuit respectively, signal pre-processing circuit with
ARPI600 data acquisition modules connect, and drive module includes solid-state relay and two-way relay, solid-state relay and miniature gas
Pump connection, two-way relay are connect with the first solenoid valve and second solenoid valve respectively, and power supply module includes 24V lithium batteries and decompression
Voltage stabilizing module, 24V lithium batteries are respectively that Raspberry Pi and display screen are powered, while also giving the first electromagnetism by lowering and stabilizing blood pressure module
Valve, second solenoid valve and micro air pump power supply, ARPI600 data acquisition modules, display screen, two-way relay and solid-state relay
It is connect respectively with Raspberry Pi.
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Application publication date: 20181009 |