CN206074625U - Bionic olfactory detection and analysis device based on dynamic air-distributing - Google Patents
Bionic olfactory detection and analysis device based on dynamic air-distributing Download PDFInfo
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- CN206074625U CN206074625U CN201621092301.2U CN201621092301U CN206074625U CN 206074625 U CN206074625 U CN 206074625U CN 201621092301 U CN201621092301 U CN 201621092301U CN 206074625 U CN206074625 U CN 206074625U
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Abstract
The utility model discloses a kind of bionic olfactory detection and analysis device based on dynamic air-distributing.The device includes dynamic gas mixer and bionic olfactory testing and analysis system.Dynamic gas mixer includes high and low concentration distribution branch road and carrier gas conveying branch road；Bionic olfactory testing and analysis system includes olfactometry unit and measurement and control unit；Olfactometry unit includes that the sample gas being linked in sequence generate room, effusion meter, gas sensor array and visor, and visor embeds temperature and relative humidity；Olfactory sensation measurement and control unit includes Measurement ＆control computer；The mass flow controller and sensor heating voltage control end, Measurement ＆control computer sensor input connection data acquisition end and Temperature Humidity Sensor of Measurement ＆control computer outfan connection dynamic gas mixer.This utility model can accurately configure the sample gas of variable concentrations and carry out olfactometry analysis, and regulating carrying throughput, gas humiture and working sensor voltage are realized the optimal control to sample gas olfactometry and its detection and analyzed.
Description
Technical field
This utility model is related to nondestructive measuring method of the farm product analytical equipment, and in particular to a kind of to be smelt based on the bionical of dynamic air-distributing
Feel detection and analysis device.
Background technology
With bionics theoretical research deeply and computer technology development, people from last century the eighties start into
The research of row bionic olfactory.Bionic olfactory detection has in fields such as food industry, environmental monitoring, disease detection and national defense construction
Tempting application prospect.In recent years, the technical field is received significant attention and most attention, Chinese patent Authorization Notice No.：
CN101135689B, discloses a kind of electric nose development platform；Chinese patent Authorization Notice No.：CN203422675U, discloses
A kind of dynamic trace gas concentration air distributing device；Chinese patent Authorization Notice No.：CN104792923A, discloses a kind of gas point
Analyzer feeder and method.Consulting literatures, existing bionic olfactory detection and analysis device are simply completed to the straight of under test gas
Detection and analysis is connect, does not consider that concentration, temperature, humidity and the working sensor change in voltage of under test gas are adapted to olfactometry
Property and impact, be unfavorable for play olfactometry effectiveness and accuracy.In addition, gas sensor is bionic olfactory technology center
The part of the heart, in addition to the characteristics such as the temperature drift and response range having with universal sensor, also with its distinctive cross sensitivity
Property.
Utility model content
The purpose of this utility model is the shortcoming and deficiency for overcoming existing bionic olfactory detection and analysis device, there is provided a kind of
Bionic olfactory detection and analysis device based on dynamic air-distributing, which can accurately configure the sample gas of variable concentrations and carry out olfactory sensation inspection
Analysis, and regulating carrying throughput, gas epidemic disaster and working sensor voltage are surveyed, is realized under test gas olfactometry
The optimal control of energy, realizes the detection and analysis to sample to be tested volatilization gas.
To achieve these goals, the bionic olfactory detection and analysis device based on dynamic air-distributing that this utility model is provided,
Including dynamic gas mixer and bionic olfactory testing and analysis system.
The dynamic gas mixer includes low concentration distribution branch road, high concentration distribution branch road and carrier gas conveying branch road, and low
Source of the gas, stop valve, gas mass flow control are respectively equipped with concentration distribution branch road, high concentration distribution branch road and carrier gas conveying branch road
Device processed, the gas outlet of low concentration distribution branch road, high concentration distribution branch road and carrier gas conveying branch road are entered with two-position three-way valve respectively
QI KOU connects, and the sample gas of the gas outlet connection bionic olfactory testing and analysis system of two-position three-way valve generate the air inlet of room.
The bionic olfactory testing and analysis system includes olfactometry unit and olfactory sensation measurement and control unit.
Olfactometry unit includes detection branch, the first cleaning branch road and the second cleaning branch road, and detection branch includes being located at
The sample gas for being used for placing on warm table sample gas generate room, and the carrier gas inlet that the sample gas generate room is dynamic with described
The humidification branch road of state air distribution system is dried branch road connection, headspace gas outlet first electromagnetic valves of Jing of sample gas generation room,
The air inlet in effusion meter communication with detection chamber, the detection intracavity are provided with gas sensor array, and the gas outlet of test chamber connects visor,
Temperature and relative humidity is provided with visor, the front end of the first cleaning branch road connects the gas outlet of the dynamic gas mixer, after
End is directly connected to the air inlet of test chamber, and the second cleaning branch road front end is directly connected to the headspace gas that sample gas generate room
Outlet, rear end directly connects air；
Olfactory sensation measurement and control unit includes Measurement ＆control computer, and the outfan of the Measurement ＆control computer arranges the first data collecting card, the
One data collecting card generates voltage signal and pulse signal, and a part of the first operational amplifiers of voltage signal Jing connection low concentration is matched somebody with somebody
Gas mass flow controller on gas branch road, high concentration distribution branch road and carrier gas conveying branch road, another part voltage signal Jing
Heating voltage control end of the pulse-width modulation circuit output to gas sensor array, the output of the second operational amplifiers of pulse signal Jing
To first, second and third electromagnet cut off valve；Meanwhile, the data acquisition end Jing impedance matching circuits of gas sensor array, the second data
Capture card connects Measurement ＆control computer, and the second data collecting cards of the temperature and relative humidity Jing connection observing and controlling being embedded in visor is calculated
Machine.
Light concentration gas source of the gas that the low concentration distribution branch road includes being linked in sequence successively, the first stop valve, the first gas
Weight flow controller, the first check valve；The high concentration distribution branch road includes the high concentrations of gas gas being linked in sequence successively
Source, the second stop valve, second gas mass flow controller, the second check valve；The carrier gas conveying branch road includes order successively
The carrier gas source of the gas of connection, the 3rd stop valve, second gas mass flow controller, the second check valve, the low concentration distribution
Road, high concentration distribution branch road and carrier gas convey the air inlet of the first check valves of branch road Jing or the second check valve and the two-position three-way valve
Mouth connection.Prepare low concentration（<=100ppm）By adjusting the first gas quality stream on low concentration distribution branch road in gas process
The size of the knob internal control traffic of the second gas mass flow controller on amount controller and high concentration distribution branch road；Match somebody with somebody
High concentration processed (>=1000ppm) in gas process by adjusting the second gas mass flow controller on high concentration distribution branch road
Knob internal control traffic size；Or first and second gas mass flow controller be connected with Measurement ＆control computer respectively, by
Measurement ＆control computer realizes external control.
The sample gas generate and the carrier gas inlet are arranged on the base of room, and the sample gas are generated and set at the top of room
Put the headspace gas outlet.
The gas sensor array is made up of 8 gas sensors, and each gas sensor is positioned over independent air chamber
Interior, circumferentially array distribution, and the air chamber is made using fire resistant aluminum alloy material, and gas can uniformly be passed through each sensor
Air chamber, it is to avoid interfering between gas sensor, improves synchronization of each gas sensor to sample gas examinations
Property and uniformity.
The warm table is for generating indoor headspace gas heating to sample gas, and the heater of warm table can set
Different heating-up temperatures are put, and interface are provided to arrange optimal sample gas detecting temperature.
This utility model dynamic gas mixer not only can continuously provide stable sample gas, and can be by adjusting sample
The flow-rate ratio of gas and carrier gas obtains the sample gas of desired concn, is particularly suited for preparing the sample gas of low concentration, overcomes
The shortcoming that in static air distributing method sample gas concentration is inaccurate and its concentration changed with standing time.
It is in bionic olfactory detection process, if sample gas excessive concentration, effective more than the maximum of gas sensor array
During detectable concentration, the carrier gas of dynamic gas mixer conveying is used as diluent gas, and sample gas are diluted, sample gas are made
Concentration in gas sensor array response band width is effectively detected and is analyzed so as to carry out.
The carrier gas source of the gas that this utility model device is used is nitrogen, because nitrogen colorless and odorless under normal circumstances, and change
Learn property very stable, experiment safety is high, low cost.
In bionic olfactory detection process, the flow velocity of sample gas is very important, if flow velocity is too fast, can make sample
Gas is also had not enough time to fully be reacted with gas sensor array and is just carried over test chamber, and cannot get effective detection curve is carried out
Experimental analysiss；If flow velocity is excessively slow, the overlong time that respond can gas sensor array, so as to increased during whole detection
Between.Therefore, this utility model device carries out accurate control to the mass flow of gas using first and second gas mass flow controller
System, it is ensured that the sample gas and gas sensor array for flowing through detection intracavity fully react, and obtain the higher detection data of precision.
Preferably, described first gas mass flow controller flow-control scope is 0～5ml/min, it is described
Second gas mass flow controller flow-control scope is 0～1000ml/min.The mark that this utility model air distribution system is prepared
Quasi- gas maximum stream flow is 1000ml/min.
Preferably, first and second gas mass flow controller adopts standard electric signal collecting and controlling, and control
Unit processed employs the higher voltage sensitive material of response speed, thus is best suited for constituting automatic control system with computer.
Preferably, described humidifier is for humidifying to the sample gas in pipeline.
To reach above-mentioned purpose, this utility model additionally provides a kind of using the above-mentioned bionic olfactory inspection based on dynamic air-distributing
The method tested and analyzed by analytical equipment is surveyed, which comprises the steps：
A1. bionic olfactory detection and analysis device is opened, the pre- thermally-stabilised 30min of bionic olfactory detection and analysis device is made；
A2. the sample gas concentration prepared as needed connects the low concentration source of the gas equipped with sample gas or high concentration gas
Source, is also turned on carrier gas source of the gas；
A3. the stable 100s of carrier gas is passed through, each gas sensor detection baseline stability is made, is obtained baseline voltage；
A4. the sample gas in being passed through low concentration source of the gas or high concentration source of the gas, and corresponding gas mass flow control is set
The parameter of device, you can sample gas are diluted to desired concn, the sample gas after dilution enter test chamber, detect the gas of intracavity
Dependent sensor array detection produces the voltage signal of change to sample gas, so as to the dynamical output for obtaining each gas sensor rings
Should；
A5. the dynamical output response signal of each gas sensor by high-speed a/d sampling unit collection after, Jing impedance matchings
Circuit, the second data collecting card transmit to Measurement ＆control computer and are stored and shown；
A6. obtain steady when the dynamical output response signal of each gas sensor rises to maximum and holding stablizes constant
Determine magnitude of voltage, baseline voltage and stable voltage are sent to into Measurement ＆control computer and ask difference to obtain gas sensor dynamic response data
The absolute increment of middle stable voltage, the absolute increment for obtaining is compared with the 5%～95% of gas sensor range, works as inspection
The interval range that the absolute increment for obtaining is distributed in the range 5%～95% is surveyed, the sample gas concentration after showing to dilute is in air-sensitive
In sensor array response band width, bionic olfactory detection and analysis detection can be carried out, conversely, the sample gas concentration after dilution
More than the valid analysing range of bionic olfactory detection and analysis, A3-A6 need to be repeated until the sample gas concentration after dilution is in air-sensitive
In sensor array response band width, bionic olfactory detection and analysis detection can be carried out；
A7. the steady-error coefficient characteristic parameter and each gas sensing of the dynamical output response signal of each gas sensor are extracted
The dynamic response characteristic parameter of device, and preferably draw the dynamic response feature of steady-error coefficient characteristic parameter and each gas sensor
Main constituent in parameter, carries out decision making level data fusion process using the method for D-S evidence theory, result is input into bionical
Olfactory sensation multiple features Factor Fusion appraisal model carries out sample analyses differentiation；
A8. after detection terminates, test chamber is cleaned with nitrogen and sample gas generates room, recover each gas sensor response
Baseline value, to carry out next pattern detection.
In the cleaning process of step A8, by the concentration quantitative ground judgment sample gas life of gas in acquisition testing chamber
Whether clean up into room, test chamber.
In the cleaning process of step A8, room is generated to sample gas and test chamber is respectively washed.
It is that, up to above-mentioned purpose, this utility model provides another kind of using the above-mentioned bionic olfactory detection based on dynamic air-distributing
The method tested and analyzed by analytical equipment, which comprises the steps：
S1. bionic olfactory detection and analysis device is opened, the pre- thermally-stabilised 30min of bionic olfactory detection and analysis device is made；
S2. it is 99.999% nitrogen that carrier gas source of the gas selects concentration；
S3. sample gas are put into into sample gas and generate indoor standing 2min, be passed through the stable 100s of nitrogen, and remove sample
Gas generates the foreign gas in room, makes each gas sensor dynamical output response return to baseline voltage；
S4. carrier gas purge sample gas enter test chamber, make each gas sensor produce the voltage signal of change, obtain each
Gas sensor dynamical output response signal；
S5. the dynamical output response signal of each gas sensor by high-speed a/d sampling unit collection after, Jing impedance matchings
Circuit, the second data collecting card transmit to Measurement ＆control computer and are stored and shown；
S6. the steady-error coefficient characteristic parameter and each gas sensing of the dynamical output response signal of each gas sensor are extracted
The dynamic response characteristic parameter of device, and preferably draw the dynamic response feature of steady-error coefficient characteristic parameter and each gas sensor
Main constituent in parameter, carries out decision making level data fusion process using the method for D-S evidence theory, result is input into bionical
Olfactory sensation multiple features Factor Fusion appraisal model carries out sample analyses differentiation；
S7. after detection terminates, test chamber is cleaned with nitrogen and sample gas generates room, recover each gas sensor response
Baseline value, to carry out next pattern detection.
Compared with prior art, this utility model it is had the advantage that for：
1）This utility model detects that intracavity is designed using gas sensor array, adopts single during solving olfactometry
The cross-sensitivity that one sensor is present affects；
2）This utility model introduces dynamic gas mixer in olfactometry front end and sample gas is implemented with dynamic air-distributing, control
Valid analysing range of the sample gas concentration in olfactory sensor, it is ensured that the effectiveness and accuracy of gas sensor reading；
3）Measurement ＆control computer of the present utility model provides carrier gas flux, gas humiture and sensor heating work voltage
The interface of control, realizes optimal control of the different operating parameter to sample to be tested gas olfactometry.
Description of the drawings
A kind of bionic olfactory detection and analysis one embodiment of device based on dynamic air-distributing that Fig. 1 is provided for this utility model
Fundamental diagram.
Fig. 2 is implemented for a kind of bionic olfactory detection and analysis device one based on dynamic gas mixer that this utility model is provided
The general assembly drawing of example.
Fig. 3 is real for a kind of bionic olfactory detection and analysis device one based on dynamic gas mixer that this utility model is provided
Apply the olfactory sensation measurement and control unit schematic diagram of example.
Fig. 4 is this utility model test chamber structural representation.
Rice font air cavity structural representations of the Fig. 5 for this utility model test chamber.
Fig. 6 is this utility model pulse-width modulation circuit and impedance matching circuit schematic diagram.
The workflow diagram of the testing and analysis system that Fig. 7 is provided for this utility model embodiment.
The utility model is described in further detail with reference to the accompanying drawings and examples.
Specific embodiment
As shown in Figure 1-Figure 3, a kind of bionic olfactory detection and analysis device one based on dynamic air-distributing of this utility model is implemented
Example includes dynamic gas mixer and bionic olfactory testing and analysis system, it is achieved thereby that dynamic gas mixer and bionic olfactory are examined
The innovation that analytical technology combines is surveyed, user utilizes this utility model device, can accurately configure the sample gas of variable concentrations
Olfactometry analysis, and the control parameter of regulating carrying throughput, gas humiture and working sensor voltage are carried out, it is right to realize
The optimal control of under test gas olfactometry performance, is also capable of achieving the detection and analysis to sample to be tested volatilization gas.
Wherein, dynamic gas mixer includes light concentration gas distribution branch road 1, and high concentrations of gas distribution branch road 2 and carrier gas are defeated
Send branch road 3.Low concentration distribution branch road 1 includes light concentration gas source of the gas 11, the first stop valve 12, the control of first gas mass flow
Device 13, the first check valve 14, and 11 the first stop valves of Jing 12 of light concentration gas source of the gas and first gas mass flow controller 13
Connected by screw thread ferrule fitting, then Jing conduits are connected by screw thread ferrule fitting with the first check valve 14.High concentration distribution
Road 2 includes high concentrations of gas source of the gas 21, the second stop valve 22, second gas mass flow controller 23, the second check valve 24, and
21 the second stop valves of Jing 22 of high concentrations of gas source of the gas are connected by screw thread ferrule fitting with second gas mass flow controller 23,
Jing conduits are connected by screw thread ferrule fitting with the second check valve 24 again.Carrier gas conveying branch road 3 include carrier gas source of the gas 31, the 3rd section
Only valve 32, second gas mass flow controller 23, the second check valve 24, and carrier gas source of the gas 31 and the 3rd stop valve 32 pass through spiral shell
Stricture of vagina ferrule fitting connects, then is incorporated in high concentration distribution branch road 2 by three way cock, then successively with second gas mass flow control
Device processed 23 and the second check valve 24 are connected by screw thread ferrule fitting.The gas outlet Jing of the first check valve 14 and the second check valve 24
Conduit is connected by screw thread ferrule fitting with the air inlet of two-position three-way valve 4 respectively；One of the gas outlet of two-position three-way valve 4 is led to
Cross screw thread ferrule fitting to be connected with humidifier 51, then the 4th stop valves 52 of Jing are generated with the sample gas of bionic olfactory detection part
The air inlet of room 71 is connected by screw thread ferrule fitting, and this branch road is humidification branch road 5, another Zhi Jing tri- of two-position three-way valve 4
The air inlet that check valve 61 directly generates room 71 with sample gas is connected by screw thread ferrule fitting, and this branch road is to be dried branch road 6.
By the 4th stop valve 52 be turned on and off choose whether that the mixed gas to preparing are humidified.
When carrying out light concentration gas distribution, open the first stop valve 12 and the 3rd stop valve 32 to select low concentration distribution
Road 1 and carrier gas conveying branch road 3, and controlled in low concentration distribution branch road 1 by adjusting first gas mass flow controller 13
Gas flow size, the low concentration mixed gas different so as to realize accurate formulation.
When carrying out high concentrations of gas distribution, open the second stop valve 22 and the 3rd stop valve 32 to select high concentration distribution
Road 2 and carrier gas conveying branch road 3, and controlled in high concentration distribution branch road 2 by adjusting second gas mass flow controller 23
The size of gas flow, the high concentration mixed gas different so as to realize accurate formulation.
First gas mass flow controller 13 and second gas mass flow controller 23 in dynamic gas mixer
Output（out）, arrange（set）Connect supporting flow indicator, then Jing flow indicators and observing and controlling with three signal ends of valve control
Computer 101 connects, so, during dynamic air-distributing, both can directly Jing first gas mass flow controller 13 and second gas matter
Amount flow controller 23 knob realize internal control, again can Jing Measurement ＆control computers 101 realize external control.
Bionic olfactory testing and analysis system includes olfactometry unit and olfactory sensation measurement and control unit.
Olfactometry unit includes the cleaning of detection branch 7, first branch road 8 and the second cleaning branch road 9.
Detection branch 7 includes that sample gas generate room 71, warm table 72, effusion meter 74, the first electromagnet cut off valve 73, detection
Chamber 75, gas sensor array 76, visor 77, the 4th check valve 78 and first row QI KOU 79.Wherein, sample gas generate room 71
It is placed on warm table 72, and the top of sample gas generation room 71 is provided with headspace gas outlet, sample gas generates the bottom of room 71
Portion is provided with carrier gas inlet.Gas sensor array 76 is made up of 8 Metal Oxide Gas Sensors.As shown in Figure 4, Figure 5, examine
Survey 75 profile of chamber cylindrical, inside is carved with " rice " font air cavity 751,75 upper surface of test chamber arranges multiple air chambers 754, each
Air chamber 754 is connected with air cavity 751, and is machined with sensor mounting hole 752 in each air chamber 754, and gas sensor array 76 is put
It is placed in these sensor mounting hole 752, on the outer wall of test chamber 75, corresponding each sensor mounting hole 752 is provided with screwed hole
753, when sensor is positioned in sensor mounting hole 752, screw fastening is screwed in by circumferential thread hole 753, it is convenient to sense
Device changes dismounting.Sample gas generate the humidification branch road 5 of carrier gas inlet and the dynamic gas mixer of room 71 or are dried branch road 6 and connect
Logical, its headspace gas outlet is connected by screw thread cutting ferrule adapter coupling with effusion meter 74 through the first electromagnet cut off valve 73, then with
Test chamber 75 is connected by screw thread ferrule fitting, and gas sensor array 76 is placed in test chamber 75.
The outlet side Jing visor 77 of test chamber 75 is connected by screw thread ferrule fitting with the 4th check valve 78, then Jing first rows
QI KOU 79 leads to air, and temperature and relative humidity is housed in visor 77；First cleaning branch road 8 is made up of the second electromagnet cut off valve 81,
And second electromagnet cut off valve 81 air inlet Jing conduits and dynamic gas mixer humidification branch road 5 or be dried branch road 6 and connect, outlet
Mouth is connected by screw thread cutting ferrule adapter coupling with the air inlet of effusion meter 74；Second cleaning branch road 9 includes the 3rd electromagnet cut off valve
91 and second exhaust port 91, the air inlet Jing conduits and sample gas of the 3rd electromagnet cut off valve 91 generate the headspace gas of room 71 and go out
Mouth is connected by screw thread ferrule fitting, and gas outlet Jing conduits, second exhaust port 92 lead to air.
Olfactory sensation measurement and control unit includes Measurement ＆control computer 101, and the outfan of the Measurement ＆control computer 101 arranges the first data acquisition
Card 102, the first data collecting card（PCIe-6353, National Instruments, TX, USA）102 generate voltage signal
And pulse signal, a part of connection low concentration distribution of the first operational amplifiers of voltage signal Jing 103 branch road 1, high concentration distribution
First and second gas mass flow controller 13,23 on road 2 and carrier gas conveying branch road 3, another part voltage signal passages through which vital energy circulates width are adjusted
Circuit processed 104 is connected to the computer heating control end of warm table 72 to arrange different running voltages, and the second computings of pulse signal Jing are put
Export to first, second and third electromagnet cut off valve 73,81,91 after 105 processing and amplifying of big device, to realize that difference in functionality gas circuit switches.When
In sample gas generation room 71 during sample loading gas, the carrier gas of the dynamic gas mixer carrier gas conveying conveying of branch road 3 is continuously purged
Sample gas generate the headspace gas that room 71 generates, and disconnect the second electromagnet cut off valve 81 and the 3rd electromagnet cut off valve 91, conducting the
One electromagnet cut off valve 73, then sample to be tested volatilization gas test chamber 75 is delivered to constant flow rate.Air-sensitive in test chamber 75 is passed
Sensor array 76 gathers the change of sample to be tested volatilization gas material and concentration, and is become by impedance matching circuit 106 and deliver to the
Two data collecting cards（PCIe-6353, National Instruments, TX, USA）After 107, collection signal is sent to
Measurement ＆control computer 101, carries out data characteristicses extraction and pattern recognition analysis, completes bionic olfactory detection and analysis.Meanwhile, in olfactory sensation
In detection process, epidemic disaster change in gas circuit, is monitored on-line by the temperature and relative humidity being embedded in visor 77, and
Collection signal is fed back to Measurement ＆control computer 101 by the second data collecting card 107.
This utility model pulse-width modulation circuit 104 is used to realize the control to gas sensor heating voltage.Impedance matching
Circuit 106 is capable of achieving to nurse one's health the signal of telecommunication of gas sensor change and gathered.
As shown in fig. 6, pulse-width modulation circuit 104 include direct-current switch power supply 1041,（Sensor）Heating voltage control end
1042nd, audion 1043, resistance 1044 and resistance 1045.Direct-current switch power supply 1041 and sensor heating voltage control end 1042
In pin 4 connect, another pin 1 is connected with the colelctor electrode of audion 1043, its base stage and emitter stage respectively with resistance 1044
Connect with resistance 1045；The other end ground connection of resistance 1045, the other end of resistance 1044 and pulse voltage V that amplitude is 5VBEven
Connect, by changing VBLow and high level state, realize the break-make of gas sensor heating circuit, so as to change gas sensor reality
Border heating voltage.
Impedance matching circuit 106 includes（Sensor）Data acquisition end 1061, variable resistance 1062, electric capacity 1063, computing
Amplifier 1064, electric capacity 1065 and electric capacity 1066, direct-current switch power supply 1067.Direct-current switch power supply 1041 is adopted with sensing data
Pin 3 in collection end 1061 connects, and another pin 2 is connected with variable resistance 1062, then by another termination of variable resistance 1062
Ground；Electric capacity 1063 is in parallel with variable resistance 1062, while the positive pole of the in-phase input end of operational amplifier 1064 and electric capacity 1063
Connection, its reverse input end are connected with outfan；Direct-current switch power supply 1067 is connected with the Input voltage terminal of operational amplifier 1064
Connect, while one end of electric capacity 1065 and electric capacity 1066 is connected with direct-current switch power supply 1067, other end ground connection；Operational amplifier
1064 output voltage terminal ground connection.
Of the present utility model use is illustrated below by concrete application.
As shown in Figure 1 and Figure 7, when this utility model device is used to include following gases when 100ppm light concentration gas are prepared
Configuration and detecting step：
（1）Bionic olfactory detection and analysis device is opened, and runs bionic olfactory testing and analysis system, detect bionic olfactory
The pre- thermally-stabilised 30min of analysis system.
（2）Low concentration source of the gas 11 connects ethylene of the concentration for 6000ppm, and it is 99.999% nitrogen that carrier gas source of the gas 31 connects concentration
Gas.
（3）The 3rd stop valve 32 is opened, the stable 100s of nitrogen is passed through, each sensor inspection of bionic olfactory testing and analysis system is made
Baseline stability is surveyed, so as to obtain baseline voltage.
（4）The first stop valve 12 is opened, and first gas mass flow controller 13 and second gas mass flow are set
The flow of controller 23 is respectively 5ml/min and 300ml/min, the ethylene gas of 6000ppm can be diluted to 100ppm.It is dilute
The humidified branch road 5 of gas after releasing is dried branch road 6 into test chamber 75, and contacts with each gas sensor in test chamber 75,
Which is made to produce the voltage signal of change, so as to the dynamical output for obtaining each gas sensor is responded.
（5）The dynamical output response signal of each gas sensor passes through impedance matching circuit 106, the second data collecting card
107 transmit to Measurement ＆control computer 101 and are stored and shown.
（6）Obtain steady when the dynamical output response signal of each gas sensor rises to maximum and holding stablizes constant
Determine magnitude of voltage, baseline voltage and stable voltage are sent to into Measurement ＆control computer 101 and ask difference to obtain gas sensor dynamic response
The absolute increment of two steady state output voltages in data, 5%～95% scope of this absolute increment with gas sensor range is entered
Row compares, and when the absolute increment that detection is obtained is distributed in above-mentioned interval range, the sample gas concentration after showing to dilute is in air-sensitive
In 76 response band width of sensor array, can be by the detection and analysis device detection of this utility model bionic olfactory, conversely, the dilution
Sample gas concentration afterwards exceedes the valid analysing range that this utility model bionic olfactory tests and analyzes device, need to repeat A3-
A6, until the sample gas concentration after dilution can carry out bionic olfactory inspection in 76 response band width of gas sensor array
Survey analysis detection.
（7）After detection terminates, the first stop valve 12 is closed, keep the 3rd stop valve 32 to open, disconnect the cut-off of the second electromagnetism
Valve 81 and the 3rd electromagnet cut off valve 91, turn on the first electromagnet cut off valve 73, make nitrogen continue through sample gas and generate room 71, inspection
Chamber 75, first row QI KOU 79 are surveyed, and are cleaned with the gas sensor in room 71 and test chamber 75 being generated to sample gas, are made to imitate
Each gas sensor response in raw olfactometry system recovers baseline value, to carry out next detection.In cleaning process, can pass through
In acquisition testing chamber 75, the concentration quantitative ground judgment sample gas of gas generates whether room 71, test chamber 75 and pipeline clean dry
Only.In addition, can also pass through to control cut-offfing for the first electromagnet cut off valve 73, the second electromagnet cut off valve 81 and the 3rd electromagnet cut off valve 91
Situation, realizes that generating the gas sensor in room 71 and test chamber 75 to sample gas is respectively washed.
As shown in Figure 1 and Figure 7, when this utility model is carried out for the Citrus and normal Citrus to infecting citrus fruit fly insect pest
During analysis and distinguishing, including following detection and analysis steps：
(1) bionic olfactory detection and analysis device is opened, and runs bionic olfactory testing and analysis system, detect bionic olfactory
The pre- thermally-stabilised 30min of analysis system.
（2）It is 99.999% nitrogen that carrier gas source of the gas 31 connects concentration.
（3）Manually it is analysed to sample and is put into sample gas generation room 71, disconnects the first electromagnet cut off valve 73 and second electric
Magnet valve stop valve 81, turns on the 3rd electromagnet cut off valve 91, and opens the 3rd stop valve 32, is passed through the stable 100s of nitrogen, removes sample
This gas generates foreign gas in room 71, to reduce impact of the foreign gas to result.
（4）The 3rd electromagnet cut off valve 91 is disconnected, the second electromagnet cut off valve 81 is turned on, the stable 100s of clean nitrogen is passed through, is made
Each sensor detection baseline zeroing in gas sensor array 76.
（5）The second electromagnet cut off valve 81 and the 3rd electromagnet cut off valve 91 are disconnected, the first electromagnet cut off valve 73 is turned on.Sample is waved
The gas sent out is in carrier gas --- and nitrogen blows lower entrance test chamber 75, and contacts with each gas sensor in test chamber 75 so as to
The voltage signal of change is produced, the dynamical output response of each gas sensor is obtained.
（6）The dynamical output response signal of each gas sensor passes through impedance matching circuit 106, the second data collecting card
107 transmit to Measurement ＆control computer 101 and are stored and shown.
（7）Data characteristicses parameter extraction module in operation Measurement ＆control computer, extracts the dynamical output of each gas sensor
Steady-error coefficient feature and the gas sensing such as maximum, maximum differential value, full section statistical average and steady-state value in response signal
The dynamic response characteristic parameter such as rise time, stabilization time, time to peak and overshoot that device begins to respond to, then run it is main into
Divide analysis module（PCA）It is preferred that drawing the main constituent in sample characteristics Parameter analysis, determined using the method for D-S evidence theory
The bionic olfactory multiple features Factor Fusion appraisal model that result input system is set up is carried out sample by plan DBMS fusion treatment
This analysis and distinguishing.
（7）After detection terminates, the first electromagnet cut off valve 73, the second electromagnet cut off valve 81 of conducting and the cut-off of the 3rd electromagnetism are disconnected
Valve 91, cleans test chamber 75 with nitrogen and sample gas generate room 71, makes each gas sensor response recover baseline value（Zeroing）,
To carry out next pattern detection.
Citrusfruit after citrus fruit fly pest damage is subjected to, the volatile constituent for being discharged and content and normal citrus fruit
Fullsized relatively has obvious difference.Above-mentioned volatile constituent is contacted with the sensing element of gas sensor changes its electrochemical properties
Become, the change is changed into the corresponding signal of telecommunication by the conversion elements of gas sensor, so as to realize the electricity to detecting volatile matter
Characterize.Gas sensor array inside this utility model bionic olfactory detection and analysis device test chamber is to infecting citrus fruit fly worm
Harmful Citrus and the detection response of normal Citrus with notable difference, thus by distinguishing in volatile matter produced by citrus fruit fly insect pest
Specific component, take the fusion of multiple features factor data and the method for pattern recognition to be capable of achieving to infecting citrus fruit fly insect pest
Citrus and normal Citrus are analyzed differentiation.
Claims (4)
1. a kind of bionic olfactory based on dynamic air-distributing tests and analyzes device, including dynamic gas mixer and bionic olfactory detection point
Analysis system, it is characterised in that
The dynamic gas mixer includes low concentration distribution branch road（1）, high concentration distribution branch road（2）Branch road is conveyed with carrier gas（3）,
And source of the gas, stop valve, gas mass flow are respectively equipped with low concentration distribution branch road, high concentration distribution branch road and carrier gas conveying branch road
Amount controller, low concentration distribution branch road（1）, high concentration distribution branch road（2）Branch road is conveyed with carrier gas（3）Gas outlet respectively with two
Position three-way valve（4）Air inlet connection, two-position three-way valve（4）Gas outlet connect bionic olfactory testing and analysis system sample gas
Body generates room（71）Air inlet；
The bionic olfactory testing and analysis system includes olfactometry unit and olfactory sensation measurement and control unit, wherein,
Olfactometry unit includes detection branch（7）, first cleaning branch road（8）And second cleaning branch road（9）, detection branch（7）
Including located at warm table（72）The upper sample gas for being used to place sample gas generate room（71）, the sample gas generation room
（71）Carrier gas inlet and the dynamic gas mixer humidification branch road（5）Or it is dried branch road（6）Connection, sample gas generate room
（71）Headspace gas outlet the first electromagnetic valves of Jing（73）, effusion meter（74）Communication with detection chamber（75）Air inlet, the test chamber
（75）Gas sensor array is provided with inside（76）, test chamber（75）Gas outlet connection visor（77）, visor（77）Inside be provided with temperature,
Humidity sensor, the first cleaning branch road（8）Front end connect the gas outlet of the dynamic gas mixer, rear end is directly connected to
Test chamber（75）Air inlet, it is described second cleaning branch road（9）Front end is directly connected to sample gas and generates room（71）Static headspace gas
Body is exported, and rear end directly connects air；
Olfactory sensation measurement and control unit includes Measurement ＆control computer（101）, outfan first data collecting card of setting of the Measurement ＆control computer
（102）, the first data collecting card generates voltage signal and pulse signal, a part of the first operational amplifiers of voltage signal Jing
（103）Gas mass flow controller on connection low concentration distribution branch road, high concentration distribution branch road and carrier gas conveying branch road, separately
A part of voltage signal via pulse width modulation（104）Export gas sensor array（76）Heating voltage control end, arteries and veins
Rush the second operational amplifiers of signal Jing（105）Export to first, second and third electromagnet cut off valve（73、81、91）；Meanwhile, gas sensing
Device array（76）Data acquisition end Jing impedance matching circuits（106）, the second data collecting card（107）Connection Measurement ＆control computer,
It is embedded in visor（77）In the second data collecting cards of temperature and relative humidity Jing（107）Connection Measurement ＆control computer（101）.
2. the bionic olfactory based on dynamic air-distributing according to claim 1 tests and analyzes device, it is characterised in that described low
Concentration distribution branch road（1）Including the light concentration gas source of the gas being linked in sequence successively（11）, the first stop valve（12）, first gas matter
Amount flow controller（13）, the first check valve（14）；The high concentration distribution branch road（2）Including the high concentration being linked in sequence successively
Gas source（21）, the second stop valve（22）, second gas mass flow controller（23）, the second check valve（24）；The load
Gas conveys branch road（3）Including the carrier gas source of the gas being linked in sequence successively（31）, the 3rd stop valve（32）, second gas mass flow control
Device processed（23）, the second check valve（24）, the low concentration distribution branch road, high concentration distribution branch road and carrier gas conveying branch road Jing first
Check valve（14）Or second check valve（24）With the two-position three-way valve（4）Air inlet connection.
3. the bionic olfactory based on dynamic air-distributing according to claim 1 tests and analyzes device, it is characterised in that the sample
This gas generates room（71）Base on the carrier gas inlet is set, the sample gas generate room（71）Top arrange described
Headspace gas are exported.
4. the bionic olfactory based on dynamic air-distributing according to claim 1 tests and analyzes device, it is characterised in that the gas
Dependent sensor array（76）It is made up of 8 gas sensors, each gas sensor is positioned over independent air chamber（754）It is interior, be in
Circumference array is distributed, and the air chamber（754）Made using fire resistant aluminum alloy material.
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| CN201621092301.2U CN206074625U (en) | 2016-09-30 | 2016-09-30 | Bionic olfactory detection and analysis device based on dynamic air-distributing |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443031A (en) * | 2016-09-30 | 2017-02-22 | 中南林业科技大学 | Bionic smell detection and analysis device based on dynamic gas distribution and detection and analysis method of bionic smell detection and analysis device |
| CN107525709A (en) * | 2017-10-11 | 2017-12-29 | 吉林省安全生产检测检验股份有限公司 | Automated gas divider and its operating method are tested in stench smell |
| CN108627619A (en) * | 2018-06-29 | 2018-10-09 | 华中农业大学 | A kind of portable electric nose quickly detected for animalsderived feedstuffs freshness |
-
2016
- 2016-09-30 CN CN201621092301.2U patent/CN206074625U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443031A (en) * | 2016-09-30 | 2017-02-22 | 中南林业科技大学 | Bionic smell detection and analysis device based on dynamic gas distribution and detection and analysis method of bionic smell detection and analysis device |
| CN106443031B (en) * | 2016-09-30 | 2017-12-01 | 中南林业科技大学 | Bionic olfactory detection and analysis device and its determination method based on dynamic air-distributing |
| CN107525709A (en) * | 2017-10-11 | 2017-12-29 | 吉林省安全生产检测检验股份有限公司 | Automated gas divider and its operating method are tested in stench smell |
| CN107525709B (en) * | 2017-10-11 | 2023-12-19 | 吉林省安全生产检测检验股份有限公司 | Automatic air distribution device for malodor smell experiment and operation method thereof |
| CN108627619A (en) * | 2018-06-29 | 2018-10-09 | 华中农业大学 | A kind of portable electric nose quickly detected for animalsderived feedstuffs freshness |
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