CN106289887B - A kind of bionical method of sampling respiration of electronic nose - Google Patents
A kind of bionical method of sampling respiration of electronic nose Download PDFInfo
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- CN106289887B CN106289887B CN201610662961.8A CN201610662961A CN106289887B CN 106289887 B CN106289887 B CN 106289887B CN 201610662961 A CN201610662961 A CN 201610662961A CN 106289887 B CN106289887 B CN 106289887B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
- G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N2001/2244—Exhaled gas, e.g. alcohol detecting
Abstract
The present invention relates to a kind of bionical method of sampling respiration of electronic nose, a complete sample cyclic includes 3 sample cyclics, and steps are as follows：First cycle of sampling starts, and electromagnetic valve for adjusting connects sucking sampling gas circuit first；It opens adjustable speed air pump and starts the sucking sampling element recycled for the first time, duration of ventilation is 1 second；Keep evaporation gas chamber and sensor gas chamber mutual indepedent and closed, 15 seconds stand-by period；The exhalation link for starting cycle for the first time makes evaporation gas chamber be connected with sensor gas chamber, opens adjustable speed air pump and starts to breathe out sample for the first time, duration of ventilation is 4 seconds；Adjustable speed air pump is closed, and simultaneously closes off access between solenoid valve, keeps evaporation gas chamber and sensor gas chamber mutual indepedent and closed, waits for sensor to reach new stable state, first breath sample cyclic terminates；Second and the process of third time circulating sampling substantially and recycle identical for the first time, parameter is different.The quick sampling of electronic nose may be implemented in the present invention.
Description
Technical field
The invention belongs to instruments and fields of measurement, and in particular to a kind of novel bionical method of sampling respiration of electronic nose.
Background technology
Electronic nose, also known as Artificial Olfactory are a kind of modern times bionical detecting instruments, it can simulate the mankind and lactation
The structure and function of animal olfactory system realize that the detection to simple or complicated smell identifies.Electronic nose generally includes gas
Sensor array, information pre-processing and pattern-recognition three parts.Currently, Electronic Nose Technology have been widely used food security,
The every field such as quality control, environmental monitoring and medical diagnosis on disease.When electronic nose detects sample, volatile flavor need to be with multiple gas
The array reaction of dependent sensor composition, electric signal is converted by the chemical signal of sample, is then passed through a series of signal conditioning, is returned
The preprocessing process such as one change, obtain synthesis " fingerprint " information corresponding to the sample, then therefrom extract (the feature life of suitable feature
At feature selecting, feature extraction) it is input to specific algorithm for pattern recognition, it is finally completed the qualitative or quantitative identification to sample.
Therefore, for Electronic Nose Technology, acquisition and the measurement of sample are matters of utmost importance.
Since the response characteristic of gas sensor is easily influenced by external environment, in order to ensure electronic nose test can
By property and repeatability, electronic nose usually requires one suitable gas chamber (test chamber) of design for accommodating gas sensor battle array
Row.And what electronic nose referred to the sampling of gas sample is exactly to design the method for sampling appropriate, by gas sample band air inlet chamber with
The process that sensor array is fully reacted.In electronic nose, the method for sampling of generally use has two major classes：Static Sampling side
Method and dynamic sampling method.
Static Sampling is that sample gas is injected into cavity, (fan can be used to accelerate to expand with the diffusion of gas
Dissipate) so that sensor array is captured gas molecule and reacts to obtain signal.Static Sampling method is simple and practicable, the electricity of early stage
Sub- nose test mode is tested using static method.However, due in Static Sampling sampling cavity and test chamber be integrated, body
Product is larger, and sample gas diffusion process is slower, and generally requiring a period of time gas molecule can just be rung with sensor
It answers.And concentration distribution is uneven in incipient stage test chamber, for the repeatability of ascent stage in sensor response curve
It is relatively low.In addition, since entire cavity volume is bigger, test chamber also very time consumption and energy consumption is cleaned every time.Therefore, the method is not applicable
In the electric nasus system of the practical applications such as quick response.Patent No. CN103558252A realizes a kind of based on Electronic Nose Technology
Grape wine sorting technique, wherein using Static Sampling method.
Dynamic sampling is different from Static Sampling, needs to bring sample gas into test chamber by carrier gas and test, whole
A test process gas is flowing.Carrier gas is generally clean air or nitrogen, and power can be provided by air pump.Dynamic sampling is pressed
It can be divided into again according to different sampling policies：Static Headspace method, Dynamic headspace method and mixing method.Dynamic sampling improves the essence of test
Degree and repeatability, while sampling cavity and test chamber separation, do not interfere with each other, test cavity volume greatly reduces, with Static Sampling phase
Than gas chamber cleaning is also more convenient.Patent No. CN102353701A realizes a kind of crop pests electronic nose using volatile matter
Diagnostic method, patent No. CN102297930A realizes identification and prediction to freshness of meat with electronic nose, wherein being all made of
The Static Headspace method of sampling.Patent No. CN103116961A realizes a kind of confined space fire spy based on Electronic Nose Technology
Alert system and method is observed and predicted, wherein using dynamic sampling method.Patent No. CN104535618A realizes a kind of based on electronics
The white wine recognition methods of nose technology, wherein using the Dynamic headspace method of sampling.
Wang Ling has investigated detectability (the electronic noses such as Wang Ling of sensor array using the method for sampling of dynamic and static combination
Application study [J] sensing technology journal in dangerous explosive detection, 2015,20 (1):42-45.).
For electronic nose, a kind of good method of sampling should be able to obtain gas within the sampling time as short as possible
Sample useful stable state/multidate information as much as possible.The good method of sampling can not only optimize the design of electric nasus system, and
The sampling precision and recognition capability of electric nasus system can be improved.Presently, there are the electronic nose method of sampling it is with their own characteristics, and
Existing dynamic sampling method is used by most electric nasus systems and is proved effectively.But the existing method of sampling, it is especially dynamic
There are still following defect and shortcomings for the state method of sampling：
(1) Static Sampling method, volume is larger, and the required reaction time is longer, and repeatability is relatively low, not easy cleaning.
(2) existing dynamic sampling method, compared with static method, though the small volume and sampling time is reduced.But it is existing dynamic
State sampling method, due to needing to obtain complete Restoration stage curve, so the sampling time is still longer.It is especially more difficult from biography to some
The sample of sensor surfaces desorption, as drinks and essential oil class equal samples, Restoration stage time are longer.
(3) existing dynamic sampling method, the typical three-stage sampling policy of generally use, i.e. ascent stage, steady-state process and
Restoration stage.If it is excessively high that ascent stage sucks concentration of specimens, and the gas sensor array long period is made to be in higher concentration
In sample gas, it is susceptible to the intoxicating phenomenon of sensor.
Invention content
In view of the above-mentioned problems, the purpose of the present invention is overcoming the shortcomings of prior art means, providing one kind can quickly adopt
The electronic nose method of sampling of sample.The present invention uses Bionic Design, and the physiology course inhaled by simulating continuous several times call by call solves existing
There is the electronic nose method of sampling to lead to sampling time longer problem since Restoration stage curve is longer, realizes quickly adopting for electronic nose
Sample.Technical scheme is as follows：
A kind of bionical method of sampling respiration of electronic nose, used electronic nose include the adjustable speed gas being connected by solenoid valve
Pump, evaporation gas chamber and sensor gas chamber, a complete sample cyclic includes 3 sample cyclics, and steps are as follows：
(1) electric nasus system powers on so that gas sample fully evaporates in evaporating gas chamber；
(2) bionical breathing samples first cycle and starts, and electromagnetic valve for adjusting connects sucking sampling gas circuit first, makes boil-off gas
Room is connected with sensor gas chamber；
(3) it opens adjustable speed air pump and starts the sucking sampling element recycled for the first time, it will by filtered pure air
Gas sample brings sensor gas chamber into along sampling gas circuit, and duration of ventilation is 1 second, controls the PWM wave duty of adjustable speed air pump rotating speed
Than being set as 55000/125000；
(4) adjustable speed air pump and electromagnetic valve for adjusting are closed, keeps evaporation gas chamber and sensor gas chamber mutual indepedent and closed, etc.
It waits for that sensor is reacted with sample and reaches stable state, 15 seconds stand-by period；
(5) start for the first time cycle exhalation link, first electromagnetic valve for adjusting realize exhalation gas circuit, make evaporation gas chamber with
Sensor gas chamber is connected, and is connected with extraneous using the solenoid valve being connected with the gas outlet of sensor gas chamber as Butterworth Hatch；
(6) it opens adjustable speed air pump to start to breathe out sample for the first time, by filtered pure air by sensor gas chamber
In sample gaseous mixture breathed out by the Butterworth Hatch, duration of ventilation is 4 seconds, PWM duty cycle 125000/125000；
(7) it is then switched off adjustable speed air pump, and simultaneously closes off access between solenoid valve, makes evaporation gas chamber and sensor gas chamber
It is mutual indepedent and closed, wait for sensor to reach new stable state, 12 seconds stand-by period, so far first breath sample cyclic knot
Beam；
(8) second and the process of third time circulating sampling substantially and recycle identical for the first time, difference is as follows：Second
Cycle sucking sampling element PWM wave duty ratio is 70000/125000, and the time is still 1 second；Second of cycle breathes out the logical of link
The gas time is 2 seconds；
(9) third time cycle sucking sampling element PWM wave duty ratio is 125000/125000, and the time is still 1 second；Third
The duration of ventilation of secondary cycle exhalation link is 1 second.
Compared with prior art, the technology of the present invention feature and effect：
(1) rapidity, compared with existing dynamic sampling method, carrying bionical method of sampling respiration can more rapidly complete to adopt
Sample process.
(2) bionical multi-section circulation sampling, puies forward the physiology mistake that bionical method of sampling respiration simulates the suction of continuous several times call by call
Journey can avoid gas sensor from being exposed in the sample atmosphere of higher concentration for a long time, be also beneficial to after the completion of sampling every time
Rapid Cleaning gas chamber.
(3) feature rich is sampled, bionical breathing sampling includes multiple continuous subcycles, and each subcycle is again by phase
Same sampling policy is completed, that is, sucks, suspends, breathes out and suspend four-stage.This sampling policy contains multiple cycles, energy
Enough bring stable state/behavioral characteristics more more abundant than existing dynamic sampling method.
Description of the drawings
Fig. 1 is used electronic nose structure diagram and work flow diagram by the present invention
Fig. 2 is existing electronic nose dynamic sampling method sampling control strategy of the present invention
Fig. 3 is the bionical method of sampling respiration sampling control strategy of electronic nose of the present invention
Fig. 4 is existing electronic nose dynamic sampling single-sensor result curve of the present invention
Fig. 5 is that the bionical breathing of electronic nose of the present invention samples single-sensor result curve
Fig. 6 is pretreated bionical breathing sampling array curve of the present invention
Specific implementation mode
The present invention will be described with reference to the accompanying drawings and examples.
Electronic nose structure of the present invention as shown in Figure 1, the electronic nose not only can direct detection gas sample, may be used also
For detecting the liquid samples such as white wine.The electronic nose mainly include evaporation and sampling apparatus, sensor gas chamber reaction device, and
Control & data acquisition pretreatment system three parts.
The method of sampling of the present invention for detecting white wine sample, the main working process of electronic nose as shown in Figure 1,
So that the white wine sample in evaporation gas chamber is fully evaporated by the heating of silicon heating tape first, pure air is then squeezed by adjustable speed pump
For carrier gas, and electromagnetic valve for adjusting controls gas circuit, and white wine sample gas is made to enter sensor gas chamber and biography therein with certain rule
Sensor array is reacted, and fully after reaction sampling, passes through AD (analog-digital conversion controller) Acquisition Circuits and signal condition
Acquisition signal is uploaded and preserves and further analyzes, whole work process is completed by main controller controls, and user also can be by touching
It touches screen interface and completes interactive controlling.
The device of electronic nose of the present invention includes adjustable speed air pump, solenoid valve, evaporation gas chamber, sensor gas chamber, AD
Acquisition chip and master controller.Wherein, adjustable air pump serves not only as bringing into sample gas the sampling pump of sensor gas chamber, also makees
For the cleaning pump cleaned to evaporation gas chamber and sensor gas chamber.
Adjustable speed air pump of the present invention is the speed governing air pump of Chengdu Qihai E & M Manufacturing Co., Ltd., model
FAY6003, operating voltage 12V, peak flow 3000mL/min, relative degree of vacuum about -36kPa, maximum output pressure
The rotating speed of 60kPa, the air pump can be adjusted by the duty ratio for the PWM wave that blue line end inputs, and the rotating speed of air pump is in yellow line
It is fed back with square wave frequency at end.
Air path part of the present invention is related to air filter and solenoid valve.Since air-channel system uses air as carrier gas, need
Filter is installed additional in the air inlet of air pump, for filtering out the impurity components such as the dust in air, in order to avoid destroy the inside of air pump
Structure.Selected solenoid valve is the OKD-1306 models of Shenzhen Ou Kada, operating voltage 12V, watt level 5.2W, D.C. resistance
220 Ω, solenoid valve length are respectively 54mm, 20mm, 31mm.
Adjustable air pump as shown in Figure 1 is connected by solenoid valve 1 with the air inlet of evaporation gas chamber, further through solenoid valve 3 and biography
The air inlet of sensor gas chamber is connected；And the gas outlet for evaporating gas chamber passes through the air inlet of solenoid valve 2 and solenoid valve 3 and sensor gas chamber
Mouth is connected；The gas outlet of sensor gas chamber is connected with solenoid valve 4.Solenoid valve 2 and solenoid valve 4 are respectively when cleaning gas chamber as steaming
It gets angry the Butterworth Hatch 1 and Butterworth Hatch 2 of room and sensor gas chamber.
The method of sampling of the present invention is cooperated and is realized by adjustable speed air pump and solenoid valve 1,2,3,4, air channels sampling
Control is automatically performed by master controller according to preset sampling control strategy.
The advantage of the bionical method of sampling respiration proposed in order to further illustrate the present invention, the present invention compared a kind of typical case
Dynamic sampling method.The control strategy of the exemplary dynamic method of sampling is as shown in Fig. 2, when being first turned on sampling pump and being passed through one section
Between sample gas, be then shut off sampling pump, waiting for a period of time makes sensor response reach stable state, then opens cleaning pump, is passed through
Pure air cleans gas chamber, until making sensor restore near baseline value.Control strategy as shown in Figure 2 is taken to obtain
The sensor response curve of exemplary dynamic sampling is as shown in Figure 4.As shown in figure 4, the dynamic sampling method is typical three-stage
Sampling, i.e. a：Ascent stage, b：Steady-state process, c：Restoration stage.Ascent stage sensor rises to steady-state response from baseline value
Then maximum value is kept for a period of time in steady-state process, is finally restored to again near baseline response value from steady-state response value.
Bionical the used control strategy of breathing sampling method proposed by the present invention is as shown in Figure 3.Entire control strategy can be drawn
It is divided into 3 cyclic processes (such as Fig. 3 dotted lines divide), each cycle stage is completed by same policy again, i.e., it is logical first to open sampling pump
Enter a bit of time samples gas, be then shut off sampling pump, waiting for a period of time makes sensor response reach stable state, then opens clear
The pump a bit of time is washed, pure air is passed through and gas chamber is cleaned, be then shut off cleaning pump, and the sensor that waits for a period of time
Response reaches new stable state.Compared with exemplary dynamic sampling policy, the bionical maximum difference of breathing sampling policy is：1, bionical
Sampling policy is breathed by simulating the continuous of short duration respiratory of biology, proposes the sampling policy of multiple cycles in the short time；2, it imitates
In raw breathing sampling policy, sample gas is passed through in each cyclic process, being then passed through pure air again is cleaned；3,
In bionical breathing sampling policy, the wash phase each recycled is very short compared to exemplary dynamic sampling, therefore does not need to make
Sensor restores to baseline.
The sensor response curve that bionical method of sampling respiration proposed by the present invention obtains is as shown in Figure 5.As shown in figure 5,
Entire sampling curve can be divided into 3 cycles stage corresponding with sampling policy, wherein each cycle stage uses phase
Same control strategy.By taking second circulation B in Fig. 5 as an example comprising 1, sucking, 2, pause, 3, exhalation, 4, pause totally 4 links.
In response curve, first circulation A is begun to respond to from the rising of baseline value attachment, and is not restored at the end of third cycle C samplings
To near baseline value.
Exactly bionical breathing uses this bionical strategy so that it is (right that the time of bionical breathing sampling greatly shortens
Than Fig. 2 and 3, Figure 4 and 5 are understood).Have benefited from the sampling policy of multiple cycles in the bionical breathing sampling short time simultaneously so that imitative
Raw breathing sampling is obtained samples abundanter stable state/dynamic response characteristic than exemplary dynamic (known to comparison Figure 4 and 5).
Electronic nose shown in Fig. 1 is sampled using bionical method of sampling respiration, its array sampled result after pretreatment
Curve is as shown in fig. 6, the sensor array includes 7 gas sensors.
Specifically the operating procedure of bionical method of sampling respiration is following (with reference to attached drawing 1,3,5,6)：
(1) electric nasus system powers on, and the preheated one-section time makes evaporation gas chamber constant temperature to 70 degrees Celsius, then first by white wine
Sample fully evaporates in evaporating gas chamber.
(2) bionical breathing samples first cycle and starts, and electromagnetic valve for adjusting realizes sucking sampling gas circuit first, makes solenoid valve
1 connects with evaporation air inlet of air chamber, so that evaporation gas chamber gas outlet is connected with solenoid valve 2, using solenoid valve 3 and sensor gas chamber
Air inlet is connected.
(3) and then opening adjustable speed air pump starts to suck sample for the first time, by filtered pure air that gaseous state is white
Wine sample brings sensor gas chamber into along sampling gas circuit, and duration of ventilation is 1 second, and the PWM wave duty ratio of control air pump rotating speed is set as
55000/125000。
(4) it is then switched off air pump, and simultaneously closes off access between solenoid valve, keeps evaporation gas chamber and sensor gas chamber mutually only
It is vertical and closed, it waits for sensor to be reacted with sample and reaches stable state, 15 seconds stand-by period.
(5) then start the exhalation link of first cycle, electromagnetic valve for adjusting first realizes exhalation gas circuit, makes solenoid valve 1
It connects with solenoid valve 3, then is connected with sensor air inlet of air chamber, solenoid valve 4 is connected as Butterworth Hatch 2 with extraneous.
(6) it and then opens adjustable speed air pump and starts to breathe out sample for the first time, by filtered pure air by sensor
Sample gaseous mixture in gas chamber is breathed out by Butterworth Hatch 2, and duration of ventilation is 4 seconds, PWM duty cycle 125000/125000.
(7) it is then switched off air pump, and simultaneously closes off access between solenoid valve, keeps evaporation gas chamber and sensor gas chamber mutually only
It is vertical and closed, wait for sensor to reach new stable state, 12 seconds stand-by period.So far first breath sample cyclic terminates.
(8) second and the process of third time circulating sampling substantially and recycle identical for the first time, difference is as follows：Second
Cycle sucking sampling element PWM wave duty ratio is 70000/125000, and the time is still 1 second；Second of cycle breathes out the logical of link
The gas time is 2 seconds.
(9) third time cycle sucking sampling element PWM wave duty ratio is 125000/125000, and the time is still 1 second；Third
The duration of ventilation of secondary cycle exhalation link is 1 second.
(10) as above, the bionical method of sampling respiration includes 3 sample cyclics altogether, and total sampling time is 91 seconds.Battle array
The curve that row complete primary bionical breathing sampling is as shown in Figure 6.
(11) it after bionical breathing sampling is complete every time, also needs to carry out evaporation gas chamber and sensor gas chamber thoroughly clear
It washes, in case next time uses.
(12) evaporation gas chamber is cleaned first, solenoid valve in gas circuit 1, solenoid valve 2 and evaporation gas chamber is connected, and will
Solenoid valve 2 is adjusted to Butterworth Hatch 1 and is connected with extraneous.
(13) adjustable speed air pump is then opened at full speed as cleaning pump, is 3 minutes to evaporation gas chamber scavenging period.
(14) then sensor gas chamber is cleaned, solenoid valve 1 is connected with solenoid valve 3, then connect with sensor gas chamber
Logical, solenoid valve 4 is adjusted to Butterworth Hatch 2 and is connected with extraneous.
(15) adjustable speed air pump is then opened at full speed as cleaning pump, is 3 minutes to sensor gas chamber scavenging period.
Bionical method of sampling respiration of the present invention also can be widely used to other a variety of gas other than above application example
The electronic nose sampling of body, liquid or solid sample, for example, for the beverages such as environmental gas, hazardous chemical gas, dairy produce, other
The electronic nose sample detecting of a variety of samples such as food, crops.Bionical method of sampling respiration of the present invention also not only limits simultaneously
In the control strategy of examples detailed above.Practical when using this method of sampling, the included cycle-index of sampling can be not limited to 3 times, often
The sampling total time of a cycle, including the time of wherein each link are also not necessarily limited to single situation described in examples detailed above.Root
Bionical method of sampling respiration is carried according to the present invention, each parameter can be adjusted flexibly, obtain further according to different electronic nose application characteristics
To the method for sampling appropriate.
Claims (1)
1. a kind of bionical method of sampling respiration of electronic nose, used electronic nose includes the adjustable speed gas being connected by solenoid valve
Pump, evaporation gas chamber and sensor gas chamber, a complete sample cyclic includes 3 sample cyclics, and steps are as follows：
(1) electric nasus system powers on so that gas sample fully evaporates in evaporating gas chamber；
(2) bionical breathing samples first cycle and starts, and electromagnetic valve for adjusting connects sucking sampling gas circuit first, make evaporation gas chamber and
Sensor gas chamber is connected；
(3) it opens adjustable speed air pump and starts the sucking sampling element recycled for the first time, by filtered pure air by gas
Sample brings sensor gas chamber into along sampling gas circuit, and duration of ventilation is 1 second, and the PWM wave duty ratio of control adjustable speed air pump rotating speed is set
It is 55000/125000；
(4) adjustable speed air pump and electromagnetic valve for adjusting are closed, keeps evaporation gas chamber and sensor gas chamber mutual indepedent and closed, waits to be passed
Sensor is reacted with sample reaches stable state, 15 seconds stand-by period；
(5) start the exhalation link of cycle for the first time, electromagnetic valve for adjusting first realizes exhalation gas circuit, makes evaporation gas chamber and sensor
Gas chamber is connected, and is connected with extraneous using the solenoid valve being connected with the gas outlet of sensor gas chamber as Butterworth Hatch；
(6) adjustable speed air pump is opened to start to breathe out sample for the first time, it will be in sensor gas chamber by filtered pure air
Sample gaseous mixture is breathed out by the Butterworth Hatch, and duration of ventilation is 4 seconds, PWM duty cycle 125000/125000；
(7) it is then switched off adjustable speed air pump, and simultaneously closes off access between solenoid valve, keeps evaporation gas chamber and sensor gas chamber mutual
It is independent and closed, wait for sensor to reach new stable state, 12 seconds stand-by period, so far first breath sample cyclic terminate；
(8) second and the process of third time circulating sampling substantially and recycle identical for the first time, difference is as follows：Second of cycle
It is 70000/125000 to suck sampling element PWM wave duty ratio, and the time is still 1 second；When the ventilation of second of cycle exhalation link
Between be 2 seconds；
(9) third time cycle sucking sampling element PWM wave duty ratio is 125000/125000, and the time is still 1 second；Third time is followed
The duration of ventilation that ring around goes out link is 1 second.
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| CN110221029A (en) * | 2019-06-28 | 2019-09-10 | 西安建筑科技大学 | A kind of simulator and analogy method of real human body respiratory |
| CN112816273B (en) * | 2020-12-30 | 2023-08-08 | 天津智易时代科技发展有限公司 | Quick sampling treatment air chamber for gas |
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