CN105572202A - Bionic detection device and method for electronic nose time-space smell information - Google Patents
Bionic detection device and method for electronic nose time-space smell information Download PDFInfo
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Abstract
The invention relates to a bionic detection device and method for electronic nose time-space smell information. A gas sensing array and a bionic air chamber are constructed in conjunction with a temperature modulation technology and a film retardation technology, and smell information data of various substances to be identified are acquired to be identified in a classified way through a subsequent mode identification algorithm. The method comprises the following steps: changing the sensitivity and selectivity of a sensor specific to different smell components through the temperature modulation technology, forming a scanning response process specific to different components of complex smell, and acquiring rich time sequence signals of different sensors in the array; setting different breathable films/semi-breathable films in an air path, simulating biological nasal cavity and mucus functions according to the characteristic of difference of diffusion transmission rates of various gas components, and acquiring the difference through the sensors distributed at different positions, namely, spatial information reflecting air chamber spreading of the smell. By adopting the method, the time-space information of the complex gas components is acquired, and a signal foundation is laid for fine identification of complex smell.
Description
Technical field
The present invention relates to a kind of bionical pick-up unit and method of Electronic Nose space-time odiferous information.
Background technology
Electronic Nose is the intelligent instrument that simulation Biologic Olfaction principle builds, if application number is the Chinese patent of 201410502332.X.Electronic Nose is made up of the gas sensing array of cross sensitivity and suitable algorithm for pattern recognition usually, automatically completes the qualitative of smell or Quantitative.It is with a wide range of applications at numerous areas such as food processing, medical diagnosis, environmental monitoring and public safeties.Electronic Nose develops can not really move towards productive life practical matter from laboratory in more than 40 year always, or can only simply identify a few specific scent at given situation, far less than the identification capability of human nose thousands of kinds of smells.
Universal electric nose in order to reach differentiate different complicated smell nuance target, wish as olfactory nerve unit in Biologic Olfaction like that, have a large amount of and dissimilar gas sensor formation mixing array, to obtain abundant odiferous information.But the gas sensor type of technology maturation is single at present, kind few, and is not produce specially for Electronic Nose, causes like this to provide enough primary odor information for the pattern-recognition stage, can only realize the rough identification of a small amount of schema category.
It is multiple that the gas sensor used in Electronic Nose at present comprises metal-oxide semiconductor (MOS) MOS type, QCM (Quartz Crystal Microbalance) QCM type, surface acoustic wave SAW type and conducting polymer CP type etc., but in serviceable life, stability and consistance except MOS type other types be difficult to the requirement meeting Electronic Nose practical application.MOS type sensor needs the working temperature of 300-500 DEG C usually, some reports have studied temperature modulation method to improve sensor sensitivity and selectivity, but in Electronic Nose, directly do not utilize the whole time serial message obtained, effective model algorithm is not had to handle accordingly yet, usual way is that obtained time serial message is carried out feature extraction, raw data is carried out significantly dimensionality reduction to adapt to general mode recognizer, thus lost a large amount of smell detailed information, be unfavorable for the sophisticated category to a large amount of and close smell.
On the other hand, in biological nose, olfactory nerve unit is directly exposed in smell environment, but be positioned at the nasal cavity with unique anatomical structure and surface coverage mucus, scent molecule is imported in the mode of convection current and diffusion by air-breathing, this process depends on diffusivity in air and mucous layer of nasal cavity structure, air-flow field, scent molecule and adsorbability and tissue thickness etc., and pertinent literature proposes multiple theoretical model from different perspectives.Equally, in Electronic Nose, the kinetics of gas reactions characteristic of each sensor present position also depends on scent molecule transmittance process in sampling apparatus, by the impact of Electronic Nose air chamber structure, gas velocity, transmission form etc.But these influence factors are used for building electric nasus system air chamber and sensor array, more to press close to Biologic Olfaction reality, obtain abundanter odiferous information, in current document, rarely have report.
Summary of the invention
The object of the invention is to overcome above shortcomings in prior art, and provide a kind of reasonable in design, in conjunction with the bionical pick-up unit of the Electronic Nose space-time odiferous information of temperature modulation technology and film delay technology and method.
The present invention's adopted technical scheme that solves the problem is: a kind of bionical pick-up unit of Electronic Nose space-time odiferous information, is characterized in that: comprise bionical air chamber, gas sensor and control module;
Bionical air chamber comprises inlet suction port, air outlet adapter, body and ventilated membrane/semi-permeable diaphragm; Body two ends seal; Inlet suction port and air outlet adapter are arranged on the two ends of body respectively, and are communicated with the tube chamber of body; Body comprises S shape pipeline and reverse-s shape pipeline; The mouth of pipe of S shape pipeline is fixed with the mouth of pipe of reverse-s shape pipeline and is communicated with, and the tube chamber of S shape pipeline is communicated with the tube chamber of reverse-s shape pipeline and forms gas circuit; Described S shape pipeline and reverse-s shape pipeline are multiple, and interval connects, and multiple S shape pipeline is connected to form longer gas circuit with reverse-s shape pipeline successively; The S shape pipeline be connected and reverse-s shape pipeline, the mouth of pipe of junction is coated with ventilated membrane/semi-permeable diaphragm, and the tube chamber of this S shape pipeline and the tube chamber of reverse-s shape pipeline separate by ventilated membrane/semi-permeable diaphragm; The tube wall of S shape pipeline and reverse-s shape pipeline has mounting hole, and gas sensor is arranged in mounting hole, and the sensing position of gas sensor is stretched in the tube chamber of S shape pipeline and reverse-s shape pipeline; The gas sensor be arranged on S shape pipeline and reverse-s shape pipeline forms sensor array;
Control module comprises processing module, working temperature modulation module and sensor array signal acquisition module; Processing module is connected with working temperature modulation module and sensor array signal acquisition module; Working temperature modulation module is connected with gas sensor with sensor array signal acquisition module; Control module comprises processing module, working temperature modulation module and sensor array signal acquisition module; Processing module is connected with working temperature modulation module and sensor array signal acquisition module; Sensor array signal acquisition module is connected with gas sensor; Working temperature modulation module mates with MOS type gas sensor, and when described gas sensor is MOS type gas sensor, working temperature modulation module is connected with MOS type gas sensor, can carry out working temperature modulation to MOS type gas sensor.
Working temperature modulation module of the present invention comprises digital to analog converter, voltage follower and power amplifier module; Sensor array signal acquisition module comprises No. four resistance, No. five resistance, No. six resistance, instrument amplifier and analog to digital converters; Processing module, digital to analog converter, voltage follower, power amplifier module connect successively; The heating resistor of MOS type gas sensor is connected with power amplifier module; The sensitive resistance of MOS type gas sensor and No. four resistance, No. five resistance, No. six resistance form Wheatstone bridge, and Wheatstone bridge, instrument amplifier, analog to digital converter, processing module connect successively;
The embedded program of processing module presets various temperature modulated drive signal, temperature modulation drive singal converts simulating signal to through digital to analog converter, again by voltage follower, be defeated by heating resistor by after power amplifier module power amplification, working temperature modulation can be realized; Wheatstone bridge output voltage is amplified by instrument amplifier, and converts unipolar signal to, then converts digital signal to processing module by analog to digital converter.
Body of the present invention comprises end socket; Body two ends end socket seals.
The present invention also comprises gas samping pump and waste discharge pump, and sampling pump is connected with control module with waste discharge pump; Inlet suction port is connected with gas samping pump, and air outlet adapter is connected with waste discharge pump.
Gas sensing array of the present invention comprises the mixing sensor array of multiple principle and type structure.
Processing module of the present invention can adopt single-chip microcomputer or microprocessor.
Power amplifier module of the present invention is made up of Darlington transistor, or adopts integrated chip.
Voltage follower of the present invention is made up of operational amplifier.
If some mounting hole of the present invention is without the need to installing gas sensor, can chock plug block these mounting holes.
Adopt the bionical pick-up unit described in the arbitrary claim of claim 1 ~ 9; Smell enters bionical air chamber by inlet suction port, then flows through each pipeline successively, finally discharges from air outlet adapter; Gas with various molecule in mixing smell spreads in ventilated membrane/semi-permeable diaphragm when flowing through ventilated membrane/semi-permeable diaphragm, gas with various molecule diffusion transport rate in gas phase with ventilated membrane/semi-permeable diaphragm is different, their diverse locations in gas circuit are caused to there is component and concentration difference, obtained the otherness signal of its correspondence by the gas sensor of diverse location, namely reflect the spatial information that smell is propagated in bionical air chamber; Working temperature modulation module constantly changes MOS type gas sensor heating voltage amplitude and frequency to modulate its working temperature, thus change MOS type gas sensor to the susceptibility of different odor composition and selectivity, form a kind of scan-type response process to heterogeneity in complicated smell, the time series signal that in array, different sensors is abundant can be obtained; Spatial information and time series signal form smell space time information; Sensor array signal acquisition module obtains the smell space time information of different sensors in sensor array; Smell space time information in sensor array is uploaded and is saved to host computer by control module.
The present invention compared with prior art, has the following advantages and effect: the present invention builds bionical gas sensing array and air chamber in conjunction with temperature modulation technology and film delay technology, to obtain the space time information of complicated odour component.With traditional single working temperature gas sensing array with do not consider that the air chamber of odor response kinetic effect is compared, abundanter smell finger print information can be obtained under the gas sensor condition of limited quantity and type, thus establish the basis of signals of the meticulous identification of complicated smell.
The present invention with Biologic Olfaction mechanism for theoretical foundation, actual in technical foundation with engineering, change conditional electronic nasus system odiferous information detection method and means, the odor identification ability of Electronic Nose can not only be improved, and breach the limited biomimetic features of conditional electronic nose, expect to expedite the emergence of the new thinking breaking through Electronic Nose Technology bottleneck, promote the theoretical developments of Artificial Olfactory.
Accompanying drawing explanation
Fig. 1 is the operating diagram of the embodiment of the present invention.
Fig. 2 is the bionical air chamber of the embodiment of the present invention, sensor array and control module schematic diagram.
Fig. 3 is embodiment of the present invention MOS type gas sensor working temperature modulation module and sensor array signal acquisition module circuit diagram.
Embodiment
Below in conjunction with accompanying drawing, also by embodiment, the present invention is described in further detail, and following examples are explanation of the invention and the present invention is not limited to following examples.
Bionical air chamber 11 comprises inlet suction port 8, air outlet adapter 10, body and ventilated membrane/semi-permeable diaphragm 5.
Body comprises S shape pipeline 1, reverse-s shape pipeline 2 and end socket 3.
Body two ends end socket 3 seals, and is fixed, can dismantle between them by bolt and nut 4.Inlet suction port 8 and air outlet adapter 10 are arranged on the two ends of body respectively, and are communicated with the tube chamber of body.
The mouth of pipe of S shape pipeline 1 and the mouth of pipe of reverse-s shape pipeline 2 are all provided with flange, and the mouth of pipe of S shape pipeline 1 and the mouth of pipe of reverse-s shape pipeline 2 are fixed by flange, fixed, can dismantle between them by bolt and nut.The mouth of pipe of S shape pipeline 1 is communicated with the mouth of pipe of reverse-s shape pipeline 2, the tube chamber of S shape pipeline 1 is communicated with the tube chamber of reverse-s shape pipeline 2 and forms gas circuit.
S shape pipeline 1 and reverse-s shape pipeline 2 are multiple, and interval connects, and so just can expand, to form longer gas circuit.
S shape pipeline 1, reverse-s shape pipeline 2 and end socket 3 all adopt polytetrafluoroethylmaterial material to make, and to prevent gas to be measured to the corrosion of bionical air chamber 11, and ensure that the gas absorption of minimum degree is remaining.
The S shape pipeline 1 be connected and reverse-s shape pipeline 2, the mouth of pipe of junction is coated with ventilated membrane/semi-permeable diaphragm 5, and the tube chamber of these two S shape pipelines 1 and reverse-s shape pipeline 2 separates by ventilated membrane/semi-permeable diaphragm 5.O-ring seal can be wrapped if desired again effectively fixedly to prevent gas leakage.
The tube wall of S shape pipeline 1 and reverse-s shape pipeline 2 evenly has mounting hole 6, mounting hole 6 diameter and gas sensor 7 similar, gas sensor 7 can insert in these mounting holes 6 fixing, and the sensing position of gas sensor 7 is stretched in the tube chamber of S shape pipeline 1 and reverse-s shape pipeline 2; Also O-ring seal can be wrapped again effectively fixedly to prevent gas leakage.If some mounting hole 6 is without the need to inserting gas sensor 7, the chock plug 9 can made with teflon blocks these mounting holes 6.Gas sensor 7 power lead and signal wire are directly connected to the sensor array signal acquisition module in neighbouring control module 14, also can carry certain signal condition or driving circuit.
The gas sensor 7 be arranged on S shape pipeline 1 and reverse-s shape pipeline 2 forms sensor array.
The present invention, according to the kinetic effect of Electronic Nose air chamber structure to odor response, improves smell sampling and gas cell device, the gas circuit in bionical air chamber 11 between each sensor is settled covering one or more layers permeable porous film/semi-permeable diaphragm 5.Diffusion couple gas molecule in gas phase is almost have no difficulty.But just different in ventilated membrane/semi-permeable diaphragm 5, due to the difference of molecular dimension and polarity, different odor molecule relative transfer rate in film is also variant, and some film also has selectivity to some scent molecule.Therefore different ventilated membrane/semi-permeable diaphragm 5 is adopted, according to its difference characteristic to various odour component diffusion transport rate, biological nasal cavity and mucus function are imitated to a certain extent, this otherness is obtained with the sensor being distributed in diverse location (straight line or plane or solid), namely reflect the spatial information that smell is propagated at air chamber, thus greatly improve system to the recognition capability of complicated smell.Available computers software carries out simulation analysis to chamber configuration, air intake pump and off-gas pump working condition and airflow field relation, and selects the suitable materials such as teflon to make air chamber, reaches the effects such as waste gas is got rid of completely, wall absorption in chamber is few.
Inlet suction port 8 is connected with gas samping pump 12, and air outlet adapter 10 is connected with waste discharge pump 13.The unlatching of two pumps, closedown and flow velocity are realized by control module 14.Smell enters first S shape pipeline 1 after can entering inlet suction port 8 by sampling pump 12, then flows through each pipeline successively, finally discharges from air outlet adapter 10; In ventilated membrane/semi-permeable diaphragm 5, free diffusing is carried out when flowing through ventilated membrane/semi-permeable diaphragm 5; Also can open waste discharge pump 13, form certain negative pressure at rear segment pipe, accelerate diffusion.
Control module 14 comprises processing module 15, working temperature modulation module and sensor array signal acquisition module.Processing module 15 is connected with working temperature modulation module and sensor array signal acquisition module; Sensor array signal acquisition module is connected with gas sensor 7.Processing module can adopt single-chip microcomputer or microprocessor.Working temperature modulation module mates with MOS type gas sensor; When gas sensor 7 is MOS type gas sensor, working temperature modulation module is connected with MOS type gas sensor, can carry out working temperature modulation to MOS type gas sensor.
Working temperature modulation module comprises digital to analog converter DAC, voltage follower and power amplifier module; Sensor array signal acquisition module comprises No. four resistance R4, No. five resistance R5, No. six resistance R6, instrument amplifier IA and analog to digital converter ADC.
Processing module 15, digital to analog converter DAC, voltage follower, power amplifier module connect successively.The heating resistor Rh of MOS type gas sensor is connected with power amplifier module.Sensitive resistance Rs and No. four resistance R4, No. five resistance R5, No. six resistance R6 of MOS type gas sensor form Wheatstone bridge, and Wheatstone bridge, instrument amplifier IA, analog to digital converter ADC, processing module 15 connect successively.
Processing module 15 embedded program presets various temperature modulated drive signal, the sine wave, the triangular wave or square wave etc. that produce different amplitude and frequency can be selected as required, then simulating signal is converted to through digital to analog converter DAC, by the follower that operational amplifier OP is formed, be defeated by heating resistor Rh by after power amplifier module power amplification, just can realize working temperature modulation.
Power amplifier module is made up of Darlington transistor (two NPN triode T1 and T2 is formed), also can use integrated chip, such as ULN2804 etc.
Wheatstone bridge output voltage is amplified by instrument amplifier IA, and converts unipolar signal to, then converts digital signal to processing module 15 by analog to digital converter ADC.By modulating the working temperature of MOS type gas sensor, obtain the time series signal that in sensor array, different sensors is abundant.
MOS type gas sensor changes principle according to the conductivity of sensitive material under uniform temperature with the change of environmental gas concentration and character to make, and the different metal that adulterates in sensitive material makees catalyzer, to improve its sensitivity, selectivity and stability.This kind of sensor commercialization degree is higher, market can obtain the product of Multiple Type, the Henan Chinese prestige electronics etc. of such as Japanese Figaro company and China.
The present invention is by constantly changing MOS type gas sensor heating voltage amplitude and frequency modulates its working temperature, thus change MOS type sensor to the susceptibility of different odor composition and selectivity, form a kind of scan-type response process to heterogeneity in complicated smell, obtain the time series signal that in array, different sensors is abundant.Modulation heating voltage can be exported from microprocessor digital port by pulse width modulation (PWM) mode, also can be produced by microprocessor and digital to analog converter DAC, and via Darlington transistor Current amplifier.The gas sensor that modulation heating voltage can be concentrated or independent actuation is different, obtains sensor to the response signal of smell with analog to digital converter ADC and microprocessor simultaneously.The change of heating voltage should in the working range of sensor nominal, and modulating frequency can by concrete assay optimization.
Smell is in bionical air chamber 11 diffusion process, chemical reaction is there is with the gas sensor 7 of diverse location in body, convert electric signal to, reached the sensor array signal acquisition module of control module 14 by respective signal wire, the smell space time information that spatial information and time series signal are formed reaches computing machine via processing module 15 or other embedded host computers carry out signal transacting and pattern-recognition.
For the gas sensor 7 of some type, such as QCM type or SAW type, without the need to analog to digital converter, but obtain data by frequency meter, correspondingly, frequency meter module can be arranged in control module, usually can be designed to multi-channel signal acquiring circuit with programmable logic device (CPLD)/FPGA.And for MOS type gas sensor, then produce drive singal by the processing module 15 in control module 14 and working temperature modulation module, working temperature modulation is carried out to gas sensor 7.Drive singal can be produced by processing module 15 and digital to analog converter DAC, and carries out circuit amplification via power amplifier module.This drive singal can be have certain biased sine wave, triangular wave, square wave etc., the frequency of usual signal is lower (such as 2 ~ 10Hz), and amplitude is upper and lower at the specified heating voltage of sensor, specifically should be determined by used gas sensor and test.Drive singal also can be that the pulse width modulation (PWM) of digital I/O port exports.
Smell carries out a period of time reaction with gas sensor 7 in bionical air chamber 11, transfers comparatively stable steady-state signal gradually to, or decides the reaction time in its sole discretion, rise time sequence signal by Dynamic Signal originally.The smell time series signal that sensor array obtains by control module and odor space information are saved to host computer.Now should open gas samping pump 12 and waste discharge pump 13 carries out pipeline " flushing ", until there are enough fresh airs to enter, and gas to be measured remaining in pipeline seldom till, next can carry out second time odor detection.
Host computer can be further processed the space-time odiferous information be made up of time series signal and spatial information that said process obtains, such as carry out digital filtering, normalization etc., then through feature extraction, be input to various algorithm for pattern recognition and carry out Classification and Identification.Dynamic process is enriched in addition in order to what keep these space-time odiferous information, also can be directly inputted to a kind of olfactory neural network KIII model based on Biologic Olfaction mechanism without feature extraction carry out remembering and identify, paper [the Fu Jun that detailed operation flow process can publish with reference to inventor, Li Guang, FreemanWJ. seasonal effect in time series Electronic Nose method for classifying modes is adopted based on olfactory neural network. sensing technology journal, 2007,20 (9): 1958-1962].
The present invention utilizes the film of ventilated membrane/semi-permeable diaphragm 5 pairs of gas molecules in gas circuit to postpone and selectivity builds bionical air chamber 11, under utilizing different operating temperature, gas sensor builds bionical sensor array to the different choice of gas and susceptibility, air-flow and senor operating temperature is controlled by associated electronic circuits such as processing module, analog to digital converter ADC, digital to analog converter DAC, signal condition and drivings, and to obtain in sensor array all gas sensors to the smell response data of article to be measured at different modulating temperature, for follow-up mode recognizer Classification and Identification.This sensor array space time information obtained in conjunction with temperature modulation technology and film delay technology, reflecting each component of complicated smell to propagate and reacting dynamics characteristic in bionical air chamber 11, is a kind of abundanter space-time odiferous information more embodying article smell feature to be measured.This space-time odiferous information can directly input without feature extraction the artificial neural network process that some has spatiotemporal mode process, then carries out Classification and Identification by sorter, obtains differentiating the result of decision.
The present invention arranges the ventilated membrane/semi-permeable diaphragm 5 of multiple tracks different materials in the gas circuit of smell process to be measured, and at the various gas sensor 7 of the different straight line/plane/stereo location arrangements of gas circuit.Different odor molecule diffusion transport rate in gas phase with ventilated membrane/semi-permeable diaphragm 5 is different, their diverse locations in gas circuit are caused to there is component and concentration difference, the signal of its correspondence can be obtained by the gas sensor 7 of diverse location, namely reflect the spatial information that smell is propagated in bionical air chamber 11.
The selectivity ratios of usual gas sensor 7 is poor, even be nominally the gas sensor detecting certain gas, also responsive to majority of gas, Electronic Nose is also just in time the wide spectrum cross sensitivity that make use of gas sensor.Particularly the present invention is towards in general electric nasus system, and the gas sensor arranged in gas circuit can be different sensing principle (such as MOS type, QCM type, CP type etc.) or a certain sensing principle but different process different model (all kinds of TGS-MOS types of such as Figaro company).The sensor of variety classes and type is driven by corresponding electronic circuit, signal condition and data acquisition.
In addition, it should be noted that, the specific embodiment described in this instructions, the shape, institute's title of being named etc. of its parts and components can be different, and the above content described in this instructions is only to structure example of the present invention explanation.
Claims (10)
1. a bionical pick-up unit for Electronic Nose space-time odiferous information, is characterized in that: comprise bionical air chamber, gas sensor and control module;
Bionical air chamber comprises inlet suction port, air outlet adapter, body and ventilated membrane/semi-permeable diaphragm; Body two ends seal; Inlet suction port and air outlet adapter are arranged on the two ends of body respectively, and are communicated with the tube chamber of body; Body comprises S shape pipeline and reverse-s shape pipeline; The mouth of pipe of S shape pipeline is fixed with the mouth of pipe of reverse-s shape pipeline and is communicated with, and the tube chamber of S shape pipeline is communicated with the tube chamber of reverse-s shape pipeline and forms gas circuit; Described S shape pipeline and reverse-s shape pipeline are multiple, and interval connects, and multiple S shape pipeline is connected to form longer gas circuit with reverse-s shape pipeline successively; The S shape pipeline be connected and reverse-s shape pipeline, the mouth of pipe of junction is coated with ventilated membrane/semi-permeable diaphragm, and the tube chamber of this S shape pipeline and the tube chamber of reverse-s shape pipeline separate by ventilated membrane/semi-permeable diaphragm; The tube wall of S shape pipeline and reverse-s shape pipeline has mounting hole, and gas sensor is arranged in mounting hole, and the sensing position of gas sensor is stretched in the tube chamber of S shape pipeline and reverse-s shape pipeline; The gas sensor be arranged on S shape pipeline and reverse-s shape pipeline forms sensor array;
Control module comprises processing module, working temperature modulation module and sensor array signal acquisition module; Processing module is connected with working temperature modulation module and sensor array signal acquisition module; Sensor array signal acquisition module is connected with gas sensor; Working temperature modulation module mates with MOS type gas sensor, and when described gas sensor is MOS type gas sensor, working temperature modulation module is connected with MOS type gas sensor, can carry out working temperature modulation to MOS type gas sensor.
2. the bionical pick-up unit of Electronic Nose space-time odiferous information according to claim 1, is characterized in that: described working temperature modulation module comprises digital to analog converter, voltage follower and power amplifier module; Sensor array signal acquisition module comprises No. four resistance, No. five resistance, No. six resistance, instrument amplifier and analog to digital converters; Processing module, digital to analog converter, voltage follower, power amplifier module connect successively; The heating resistor of MOS type gas sensor is connected with power amplifier module; The sensitive resistance of MOS type gas sensor and No. four resistance, No. five resistance, No. six resistance form Wheatstone bridge, and Wheatstone bridge, instrument amplifier, analog to digital converter, processing module connect successively;
The embedded program of processing module presets various temperature modulated drive signal, temperature modulation drive singal converts simulating signal to through digital to analog converter, again by voltage follower, be defeated by heating resistor by after power amplifier module power amplification, working temperature modulation can be realized; Wheatstone bridge output voltage is amplified by instrument amplifier, and converts unipolar signal to, then converts digital signal to processing module by analog to digital converter.
3. the bionical pick-up unit of Electronic Nose space-time odiferous information according to claim 1 and 2, is characterized in that: described body comprises end socket; Body two ends end socket seals.
4. the bionical pick-up unit of Electronic Nose space-time odiferous information according to claim 1 and 2, is characterized in that: also comprise gas samping pump and waste discharge pump, sampling pump is connected with control module with waste discharge pump; Inlet suction port is connected with gas samping pump, and air outlet adapter is connected with waste discharge pump.
5. the bionical pick-up unit of Electronic Nose space-time odiferous information according to claim 1 and 2, is characterized in that: described gas sensing array comprises the mixing sensor array of multiple principle and type structure.
6. the bionical pick-up unit of Electronic Nose space-time odiferous information according to claim 1 and 2, is characterized in that: described processing module can adopt single-chip microcomputer or microprocessor.
7. the bionical pick-up unit of Electronic Nose space-time odiferous information according to claim 1 and 2, is characterized in that: described power amplifier module is made up of Darlington transistor, or adopts integrated chip.
8. the bionical pick-up unit of Electronic Nose space-time odiferous information according to claim 1 and 2, is characterized in that: described voltage follower is made up of operational amplifier.
9. the bionical pick-up unit of Electronic Nose space-time odiferous information according to claim 1 and 2, is characterized in that: if some mounting hole is without the need to installing gas sensor, can chock plug block these mounting holes.
10. a bionical detection method for Electronic Nose space-time odiferous information, is characterized in that: adopt the bionical pick-up unit described in the arbitrary claim of claim 1 ~ 9; Smell enters bionical air chamber by inlet suction port, then flows through each pipeline successively, finally discharges from air outlet adapter; Gas with various molecule in mixing smell spreads in ventilated membrane/semi-permeable diaphragm when flowing through ventilated membrane/semi-permeable diaphragm, gas with various molecule diffusion transport rate in gas phase with ventilated membrane/semi-permeable diaphragm is different, their diverse locations in gas circuit are caused to there is component and concentration difference, obtained the otherness signal of its correspondence by the gas sensor of diverse location, namely reflect the spatial information that smell is propagated in bionical air chamber; Working temperature modulation module constantly changes gas sensor heating voltage amplitude and frequency to modulate its working temperature, thus change gas sensor to the susceptibility of different odor composition and selectivity, form a kind of scan-type response process to heterogeneity in complicated smell, the time series signal that in array, different sensors is abundant can be obtained; Spatial information and time series signal form smell space time information; Sensor array signal acquisition module obtains the smell space time information of different sensors in sensor array; Smell space time information in sensor array is uploaded and is saved to host computer by control module.
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| CN106526080A (en) * | 2016-11-04 | 2017-03-22 | 上海朗绿建筑科技股份有限公司 | Collection and odor evaluation methods for building interior decoration materials |
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| WO2021123601A1 (en) | 2019-12-16 | 2021-06-24 | Aryballe Technologies | Method and device for obtaining the temporal olfactory signature of a sample and uses of the method |
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