CN107121463A - A kind of multi-channel electronic nose detecting system and its measuring method - Google Patents
A kind of multi-channel electronic nose detecting system and its measuring method Download PDFInfo
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- CN107121463A CN107121463A CN201710287032.8A CN201710287032A CN107121463A CN 107121463 A CN107121463 A CN 107121463A CN 201710287032 A CN201710287032 A CN 201710287032A CN 107121463 A CN107121463 A CN 107121463A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
- G01N27/64—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using wave or particle radiation to ionise a gas, e.g. in an ionisation chamber
Abstract
The invention discloses a kind of multi-channel electronic nose detecting system and its measuring method, system is made up of the part of gas detection cell, signal processing, wireless transport module, alarm module and display module etc. five, multiple gases, including ammonia, hydrogen sulfide, carbon monoxide, ethanol, formaldehyde, acetone, VOC etc. can be monitored in real time.Measuring method adds before air chamber air inlet sampling and carries out base-line data measurement, time drift correcting algorithm is added to gas data so that the data analysis of gas is more accurate.Present system gas collection physical examination survey, data are wirelessly transferred, data are stored in one, Highgrade integration, intellectuality, there is preferable booster action for commercial Application, be adapted to the ambient air monitoring of various industrial parks, air monitering from far-off regions etc., have a extensive future.
Description
Technical field
The invention belongs to gas detection technology field, and in particular to a kind of multi-channel electronic nose detecting system and its measurement side
Method.
Background technology
The health hazard that environmental air pollution comes to people is very big, and some gas very small amounts can be just caused to humans and animals
Grievous injury, and the concentration of pernicious gas and material exceedes the limit that can allow of environment in air, and continues one regularly
Between after will change the normal composition of air, destruction nature physics, chemistry and ecological balance system, so as to endanger the life of people
Living, work and ecological balance system.
So the detection for air has been essential a work, and existing industrial park gas-monitoring side
Case is that single gas-monitoring or function are single mostly, and monitoring system data are unstable, with the passage data of use time
Drift is bigger, can not meet the current real-time monitoring to multiple gases.Most of industrial park gas-monitorings are using half now
Conductor sensor, but semiconductor transducer is normally only used for qualitative analysis, the Concentration Testing effect for gas is poor, it is impossible to
Realize the sampled data Accurate Analysis to gas.
The content of the invention
In view of above-mentioned, the present invention is in order to which to the monitoring in real time of industrial park multiple gases, there is provided a kind of multi-channel electronic nose
Detecting system and its measuring method, it uses multiple sensor to carry out gas collecting, and carries out record analysis to gas data, when
The exceeded situation of gas content realizes alarm.
A kind of multi-channel electronic nose detecting system, including：
Air chamber sampling device, for being sampled to surrounding air, makes contaminated air be extracted into air chamber；
Signal gathering unit, for being acquired to the various gases in air chamber, and generates corresponding signal；The gas bag
Include ammonia, hydrogen sulfide, formaldehyde, ethanol, DMF (Dimethylformamide, dimethylformamide), VOC (Volatile
Organic Compounds, VOC) and organic gas；
Signal conditioning circuit, for nursing one's health the signal produced by signal gathering unit；
Main control module, for nursing one's health signal conditioning circuit after signal handle, generate on gas content, concentration
Data result, and according to this carry out analysis judgement；
Alarm module, the trigger signal carry out sound produced according to main control module, which rings, alarms；When associated gas content overproof,
Main control module sends the trigger signal to alarm module；
Display module, the data result on gas content, concentration for being generated to main control module is shown.
Further, the signal gathering unit includes electrochemical sensor, semiconductor transducer and photoionization gas
Body sensor (Photo Ionization Detector, PID)；Wherein, electrochemical sensor be used for ammonia, hydrogen sulfide with
And formaldehyde is acquired, semiconductor transducer is used to be acquired ethanol, VOC and organic gas, and photoionization gas is passed
Sensor is for DMF etc., other dusty gas to be acquired.
Further, the semiconductor transducer use TGS2620, TGS2602, TGS2600 respectively to ethanol, VOC with
And organic gas is acquired.
Further, the signal conditioning circuit includes LMP91000 chips and TLC272 chips；Wherein, LMP91000
Chip pins are nursed one's health the signal that electrochemical sensor is collected, and TLC272 chip pins are collected to semiconductor transducer
Signal nursed one's health.
Further, the main control module uses single-chip microcomputer, and the alarm module uses buzzer, and the display module is adopted
Use LCD touch screen.
Further, the main control module is connected with 4G transport modules, and the 4G transport modules are used to give birth to main control module
Into the data result on gas content, concentration mobile phone terminal and given server be sent to by the form of network transmission.
The measuring method of above-mentioned multi-channel electronic nose detecting system, comprises the following steps：
(1) baseline value for obtaining under test gas is measured by base-line data；
(2) measured value for obtaining under test gas is gathered using signal gathering unit；
(3) carry out PLS (PLS) to baseline value and measured value by main control module to handle, and gas concentration is entered
Row is pre- to be judged, different gas datas are done using PCA (Principal Component Analysis, principal component analysis) algorithm
Classification is handled, and the concentration of corresponding gas is finally accurately measured in actual environment measurement.
Base-line data measurement process in the step (1) is：Air is passed through air chamber first and continues 5 minutes, Ran Houtong
Closing under test gas is passed through after entering 1PPM under test gas, 2 minutes, the data that record sensor is collected after stable, so
It is passed through air again afterwards to be cleaned, specific ventilation flow is：Be passed through air->Be passed through 1PPM under test gas->It is passed through air clear
Wash->Be passed through 2PPM under test gas->Be passed through air cleaning->Be passed through 3PPM under test gas->Be passed through air cleaning->It is passed through
4PPM under test gas->Be passed through air cleaning->Be passed through 5PPM under test gas->Be passed through air cleaning->It is passed through 6PPM to be measured
Gas->Be passed through air cleaning->Be passed through 7PPM under test gas->Be passed through air cleaning->Be passed through 8PPM under test gas->It is logical
Enter air cleaning->Be passed through 9PPM under test gas->Be passed through air cleaning->Be passed through 10PPM under test gas->It is passed through air clear
Wash；Wherein, each under test gas, which is passed through, continues 2 minutes, and each air, which is passed through, continues 5 minutes, and air cleaning is passed through every time
Data of preceding record are baseline value.
The process of collection acquisition under test gas measured value is in the step (2)：Nitrogen is passed through air chamber to clear first
Sensor is washed, sensor is returned to reset condition；Then pass under test gas be allowed to the abundant haptoreaction of sensor, continue
Ventilation is closed after 5 minutes, the measurement data of sensor is reached and data is preserved after peak value；Then under test gas is passed through again, so
Repeated measurement three times, the measured value that acquisition is three times.
Preferably, before gas concentration is calculated, main control module is right using RTC (Real-Time Clock, real-time clock)
The use date of sensor is recorded, and the measurement error of sensor every month is contrasted according to the time, is passed through to add and is missed
Difference amendment so that the measurement data of sensor is not produced with the drift of time compared with serious mistake, it is ensured that final measurement data is stable.
Present system has following advantageous effects：
(1) present system gas-monitoring accuracy is high；Added before air chamber air inlet sampling and carry out base-line data measurement, it is right
Gas data adds time drift correcting algorithm so that the data analysis of gas is more accurate.
(2) air chamber in the present invention is designed using anti-corrosion material, and stability is higher.
(3) present system can in real time be monitored to multiple gases, including ammonia, hydrogen sulfide, formaldehyde, ethanol,
DMF, CO, VOC etc..
(4) present system data display is shown using 7 cun of touch-screens, more attractive in appearance, and can be controlled by touching
System processed.
(5) present system adds noise reduction filtering processing for the more tight a beautiful gem of circuit design.
(6) present system has a wide range of application, and can be applied to the environment such as industrial park, Forest area, high mountain.
Brief description of the drawings
Fig. 1 is the structural representation of multi-channel electronic nose detecting system of the present invention.
Embodiment
In order to more specifically describe the present invention, below in conjunction with the accompanying drawings and embodiment is to technical scheme
It is described in detail.
As shown in figure 1, multi-channel electronic nose detecting system of the present invention includes：Air chamber sampling section, signal conditioning circuit, master
Control module, alarm module, display module and 4G transport modules；Wherein, air chamber sampling section include air chamber, sampling device and
Signal gathering unit.
Air chamber is designed using anti-corrosion material, and sampling device is used to be sampled surrounding air, and pollution air is extracted into gas
In room, signal gathering unit is used to be acquired the gas in air chamber.Wherein the tight requirements of air chamber will be reached outside no gas
Leakage, the interface of air chamber external sensor will coincide with sensor size, only preserved signal line and air inlet of air chamber outside；Air pump
Air of sampling reaches air chamber by air inlet of air chamber, is fully contacted with sensor, enables the sensor to complete with measurement measurement gas
Full response, and close air pump after gas enters air inlet chamber, it is ensured that the seal of air chamber, make measurement data more accurate；Air chamber
Size will accomplish 500 cubic centimetres, meet the reaction air capacity of sensor.
Signal gathering unit includes electrochemical sensor, semiconductor transducer and PID sensor in present embodiment；Its
In, ammonia, hydrogen sulfide, the collection of formaldehyde use electrochemical sensor, alcohol, VOC, organic gas collection using TGS2620,
These three semiconductor transducers of TGS2602, TGS2600 are acquired, and other dusty gas such as DMF are gathered using PID sensor.
Signal conditioning circuit includes LMP91000 chips and TLC272 chips；Wherein, LMP91000 chip pins are to electrification
The signal that sensor is collected is nursed one's health, and TLC272 chip pins are adjusted to the signal that semiconductor transducer is collected
Reason, the signal of final output, which is sent in single-chip microcomputer, to be handled.
The analog signal that main control module is exported to signal conditioning circuit is handled, and present embodiment is real using single-chip microcomputer
Existing, its Program passes through Keil software programmings, processing gas signal and whole system operating instruction.
Alarm module is that alarm is realized after judging the currently monitored data, if a certain gas content exceedes early warning value
Buzzer just is responded, tweeting sound is sent.
Display portion is that the currently monitored parameters are shown, present embodiment is shown by 7 cun of touch display screens
Current data information.
4G transport modules are to carry out network transmission to Monitoring Data, Monitoring Data are sent in real time mobile phone terminal and specify clothes
Current detection data can be preserved by business device, convenient to record later.
As can be seen here, present embodiment system is entered using multichannel electrochemical sensor, semiconductor transducer and PID sensor
Row gas collecting and analysis, sensor include PID-200, TGS2600, TGS2620, TGS2602, NH3/CR-200, H2S/CR-
200th, CH2O/CR-200 etc., can gather the multiple gases such as ethanol, ammonia, hydrogen sulfide, formaldehyde, VOC, DMF, and to gas number
According to progress record analysis.
Present embodiment, which is added, before air chamber air inlet sampling carries out base-line data measurement, and time drift is added to gas data
Shift correction algorithm.Wherein base line measurement is that substantial amounts of base value measurement is carried out in preliminary examination systematic survey, and measurement gas concentration is used
Gas flowmeter is accurately configured, and the base line measurement process by taking ammonia as an example is as follows：Air is passed through air chamber first and enters line sensor
After cleaning 5 minutes, the ammonia for then passing to 1PPM is measured, and closing ammonia after being passed through two minutes is passed through, and pending data is steady
Record data after fixed, is then passed through air and is cleaned for 5 minutes again.In detail ventilation flow be：Air->1PPM ammonias->It is empty
Gas cleaning->2PPM ammonias->Air cleaning->3PPM ammonias->Air cleaning->4PPM ammonias->Air cleaning->
5PPM ammonias->Air cleaning->6PPM ammonias->Air cleaning->7PPM ammonias->Air cleaning->8PPM ammonias->
Air cleaning->9PPM ammonias->Air cleaning->10PPM ammonias->Air cleaning.Logical measurement gas two minutes, lead to every time
Air 5 minutes.10 different gradient datas are so measured, every kind of measurement will carry out baseline value measurement as above.
Actual measurement process：Be passed through nitrogen->Be passed through environment under test gas->Closing ventilation->It is passed through environment gas to be measured
Body->Closing ventilation->It is passed through environment under test gas；Wherein for the first time the purpose of logical pure nitrogen gas be for cleaning sensor,
Sensor returns to reset condition, then passes to environment under test gas 5 minutes, be allowed to the abundant haptoreaction of sensor, then
Ventilation is closed, the measurement data of sensor is reached peak value and is preserved data, is then ventilated, so surveyed repeatedly for three times again
Amount, obtains 3 measurement data,
Finally measurement data record is got off, PLS processing is done to measurement data and baseline value and comes dense to unknown gas
Degree is judged that different gas initial data are classified using PCA algorithms in advance, finally can be with actual environment is measured
Accurately measure the concentration of corresponding gas.The use date of sensor is carried out using RTC for time elegant correction process system
Record, is contrasted with the measurement error of the every month of sensor, error correction is added in a program, it is ensured that the measurement of sensor
Data do not produce larger mistake with the drift of time.Ensure that final measurement data is stable.
The above-mentioned description to embodiment is understood that for ease of those skilled in the art and using the present invention.
Person skilled in the art obviously can easily make various modifications to above-described embodiment, and described herein general
Principle is applied in other embodiment without passing through performing creative labour.Therefore, the invention is not restricted to above-described embodiment, ability
Field technique personnel are according to the announcement of the present invention, and the improvement made for the present invention and modification all should be in protection scope of the present invention
Within.
Claims (10)
1. a kind of multi-channel electronic nose detecting system, it is characterised in that including：
Air chamber sampling device, for being sampled to surrounding air, makes contaminated air be extracted into air chamber；
Signal gathering unit, for being acquired to the various gases in air chamber, and generates corresponding signal；The gas includes ammonia
Gas, hydrogen sulfide, formaldehyde, ethanol, DMF, VOC and organic gas；
Signal conditioning circuit, for nursing one's health the signal produced by signal gathering unit；
Main control module, for nursing one's health signal conditioning circuit after signal handle, generate on gas content, the number of concentration
According to result, and analysis judgement is carried out according to this；
Alarm module, the trigger signal carry out sound produced according to main control module, which rings, alarms；When associated gas content overproof, master control
Module sends the trigger signal to alarm module；
Display module, the data result on gas content, concentration for being generated to main control module is shown.
2. multi-channel electronic nose detecting system according to claim 1, it is characterised in that：The signal gathering unit includes
Electrochemical sensor, semiconductor transducer and photoionization gas sensor；Wherein, electrochemical sensor be used for ammonia,
Hydrogen sulfide and formaldehyde are acquired, and semiconductor transducer is used to be acquired ethanol, VOC and organic gas, photoion
Change gas sensor for other dusty gas to be acquired to DMF etc..
3. multi-channel electronic nose detecting system according to claim 2, it is characterised in that：The semiconductor transducer is used
TGS2620, TGS2602, TGS2600 are acquired to ethanol, VOC and organic gas respectively.
4. multi-channel electronic nose detecting system according to claim 2, it is characterised in that：The signal conditioning circuit includes
LMP91000 chips and TLC272 chips；Wherein, LMP91000 chip pins are entered to the signal that electrochemical sensor is collected
Row conditioning, TLC272 chip pins are nursed one's health the signal that semiconductor transducer is collected.
5. multi-channel electronic nose detecting system according to claim 1, it is characterised in that：The main control module uses monolithic
Machine, the alarm module uses buzzer, and the display module uses LCD touch screen.
6. multi-channel electronic nose detecting system according to claim 1, it is characterised in that：The main control module is connected with 4G
Transport module, the data result on gas content, concentration that the 4G transport modules are used to generate main control module passes through net
The form of network transmission is sent to mobile phone terminal and given server.
7. the measuring method of multi-channel electronic nose detecting system as described in claim 1~6 any claim, including following step
Suddenly：
(1) baseline value for obtaining under test gas is measured by base-line data；
(2) measured value for obtaining under test gas is gathered using signal gathering unit；
(3) PLS processing is carried out to baseline value and measured value by main control module, and gas concentration judged in advance, different gas
Volume data is classified using PCA algorithms, and the concentration of corresponding gas is finally accurately measured in actual environment measurement.
8. measuring method according to claim 7, it is characterised in that：Base-line data measurement process in the step (1)
For：Air is passed through air chamber first and continues 5 minutes, closing under test gas is led to after then passing to 1PPM under test gas, 2 minutes
Enter, then the data that record sensor is collected after stable are passed through air and are cleaned again, specific ventilation flow is：It is passed through
Air->Be passed through 1PPM under test gas->Be passed through air cleaning->Be passed through 2PPM under test gas->Be passed through air cleaning->It is logical
Enter 3PPM under test gas->Be passed through air cleaning->Be passed through 4PPM under test gas->Be passed through air cleaning->5PPM is passed through to treat
Survey gas->Be passed through air cleaning->Be passed through 6PPM under test gas->Be passed through air cleaning->Be passed through 7PPM under test gas->
Be passed through air cleaning->Be passed through 8PPM under test gas->Be passed through air cleaning->Be passed through 9PPM under test gas->It is passed through air
Cleaning->Be passed through 10PPM under test gas->It is passed through air cleaning；Wherein, each under test gas, which is passed through, continues 2 minutes, every time
Air, which is passed through, continues 5 minutes, is passed through every time before air cleaning and records a data i.e. baseline value.
9. measuring method according to claim 7, it is characterised in that：Collection obtains under test gas and surveyed in the step (2)
The process of value is：Nitrogen is passed through air chamber to cleaning sensor first, sensor is returned to reset condition；Then pass to
Under test gas be allowed to the abundant haptoreaction of sensor, continue after 5 minutes close ventilation, the measurement data of sensor is reached peak
Data are preserved after value；Then it is passed through under test gas again, such repeated measurement three times obtains the measured value of three times.
10. measuring method according to claim 7, it is characterised in that：Before gas concentration is calculated, main control module is used
RTC is recorded to the use date of sensor, the measurement error of sensor every month is contrasted according to the time, by adding
Enter error correction so that the measurement data of sensor is not produced with the drift of time compared with serious mistake, it is ensured that final measurement data
It is stable.
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| CN108254329A (en) * | 2018-01-23 | 2018-07-06 | 盐城工学院 | Automobile VOC concentration detection systems and method |
| CN109270217A (en) * | 2018-09-29 | 2019-01-25 | 江苏芯力特电子科技有限公司 | A kind of scent detector and monitoring method for toilet |
| CN112229952A (en) * | 2020-09-30 | 2021-01-15 | 重庆科技学院 | Method for detecting toxic and harmful gas in chemical industrial park |
| CN112461998A (en) * | 2020-11-10 | 2021-03-09 | 四川君逸数码科技股份有限公司 | Automatic calibration method for underground pipe gallery gas sensor |
| CN113267533A (en) * | 2021-05-18 | 2021-08-17 | 浙江大学 | Device and method for dynamically monitoring VOCs (volatile organic chemicals) on line by self-calibration gas sensor array |
| CN113358702A (en) * | 2021-06-08 | 2021-09-07 | 无锡时和安全设备有限公司 | Pollution source monitoring system based on sensor array modularization |
| CN114881168A (en) * | 2022-05-25 | 2022-08-09 | 北京市生态环境监测中心 | Photoionization detector calibration method, photoionization detector calibration system, electronic device and storage medium |
| CN115047145A (en) * | 2022-05-30 | 2022-09-13 | 吉林大学 | Vehicle-mounted detector for electronic nose combination of enricher |
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| CN113267533A (en) * | 2021-05-18 | 2021-08-17 | 浙江大学 | Device and method for dynamically monitoring VOCs (volatile organic chemicals) on line by self-calibration gas sensor array |
| CN113358702A (en) * | 2021-06-08 | 2021-09-07 | 无锡时和安全设备有限公司 | Pollution source monitoring system based on sensor array modularization |
| CN114881168A (en) * | 2022-05-25 | 2022-08-09 | 北京市生态环境监测中心 | Photoionization detector calibration method, photoionization detector calibration system, electronic device and storage medium |
| CN115047145A (en) * | 2022-05-30 | 2022-09-13 | 吉林大学 | Vehicle-mounted detector for electronic nose combination of enricher |
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