CN104280427A - Pressure enrichment type low-concentration gas volatile electronic-nose detection system - Google Patents
Pressure enrichment type low-concentration gas volatile electronic-nose detection system Download PDFInfo
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- CN104280427A CN104280427A CN201410406146.6A CN201410406146A CN104280427A CN 104280427 A CN104280427 A CN 104280427A CN 201410406146 A CN201410406146 A CN 201410406146A CN 104280427 A CN104280427 A CN 104280427A
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Abstract
The invention relates to a pressure enrichment type low-concentration gas volatile electronic-nose detection system. The pressure enrichment type low-concentration gas volatile electronic-nose detection system comprises a gas sensitive sensor unit, a gas flow control mechanism and a control unit, wherein the gas flow control mechanism is provided with a gas chamber for enriching detected gas volatiles; the gas sensitive sensor unit is arranged inside the gas chamber; the control unit is respectively connected with the gas sensitive sensor unit and the gas flow control mechanism; the gas pressure in the gas chamber is controlled by the control unit. The gas pressure of the detected gas in the gas chamber is controlled to be greater than two standard atmospheric pressures; the contact reaction concentration of the to-be-detected gas volatiles such as synomone and a reaction part of the gas sensitive sensor is reduced; the requirement of the electronic-nose system on the sensitivity of the gas sensitive sensor is reduced; the selectivity of the gas sensitive sensor is improved; the cost is reduced; the technical problem of high production cost caused by the adoption of a ppb-grade gas sensitive sensor in the conventional electronic-nose system due to the low concentration of the gas volatiles such as synomone can be solved.
Description
Technical field
The present invention relates to Electronic Nose Detection Techniques, be specifically related to pressure enrichment formula low amounts volatile gas Electronic Nose detection system.
Background technology
Insect pest is very frequent and serious at the occurrence and harm of China, causes huge infringement to the aspect such as crops, gardens.Such as: the rice area 1.3 ~ 2 × 10 that China is injured every year
7hm
2, account for 50% of total cultivated area, cause Rice Yield Loss Caused to reach more than 10%.Being prevention than the more effective mode for the treatment of, is early treatment than the more effective mode of post.Early stage efficient, quick detect delay occurs in reinforcement insect pest is the problem that Chinese scholars is endeavoured to study always, not yet satisfactorily resolves so far.
Current existing insect pest detection method has: the detection of manual detection, acoustical signature, detections of radar, image recognition and spectrum monitoring etc.Manual detection, as insect pest situation acquisition of information means main at present, is clapped mainly through dish, is lured the methods such as collection, uses the sense organ artificially of people to detect insect; The method detection efficiency is low, and testing cost is high, and labour intensity is large and large by the impact that sampling is good and bad.Other machines detection method reduces labour intensity to a certain extent, improves detection efficiency, but due to insect pest generation environment more complicated, the factor such as animal migration, shielding by intensity of illumination, insect affects comparatively large, still can not meet the needs of actual production.
According to scientific research, plant can discharge some special volatile gas when the attack being subject to insect, and so-called is synomone, is used for walking quickly and keeping away insect and causes population response, with the mutual relationship between regulating plant, insect and its natural enemy, reach the object of defence.This provides feasibility for the utilization of Electronic Nose on insect pest Real-Time Monitoring.
Electronic Nose with the Global Information of specific sensor array and pattern recognition system quick obtaining sample, the hidden feature of instruction sample.Without the need to using solvent when electric nasus system is measured, analysis speed is fast, and is easy to carry, and compared with human olfactory, it does not affect by subjective factor, more objective, is with a wide range of applications on insect pest detects.But traditional electric nasus system is for volatile gas design widely, therefore the high sensitivity gas sensor of 10 or more is usually needed to form sensor array, and the synomone concentration that plant produces is lower, usually sensitivity is needed to be the sensor of ppb level, price is very expensive, and the selectivity of sensor is little.On the other hand, different humiture causes larger impact, because traditional electric nasus system does not have temperature and humidity compensation function can to the testing result of Electronic Nose.
Summary of the invention
The invention provides pressure enrichment formula low amounts volatile gas Electronic Nose detection system, need to adopt ppb level gas sensor thus the technical matters involved great expense because synomone concentration is low to solve conditional electronic nasus system.
In order to solve the problems of the technologies described above, the present invention is by the following technical solutions: pressure enrichment formula low amounts volatile gas Electronic Nose detection system, comprise gas sensor unit, airflow control mechanism and control module, described airflow control mechanism is provided with the air chamber for the tested volatile gas of enrichment, and described gas sensor unit is arranged in described air chamber; Described control module is connected with gas sensor unit, airflow control mechanism respectively, and the controlled atmosphere in air chamber is in control module.
In a preferred embodiment, the air pressure controlled unit in described air chamber controls more than 2 standard atmospheric pressures.
In a preferred embodiment, pressure enrichment formula low amounts volatile gas Electronic Nose detection system also comprises and being arranged on for detecting the baroceptor of air chamber internal gas pressure in air chamber, and described baroceptor is connected with control module.
Preferably, described air chamber is designed to spherical or is the cylindrical compression tank of dome head, and air chamber skin is made up of titanium alloy material, and air chamber internal layer scribbles polytetrafluoroethylmaterial material.
Described gas sensor unit preferably forms by the gas sensor of the main constituent-sensitive of tested volatile gas, to reduce the requirement of Electronic Nose detection system to gas sensor inspiration degree, cost-saving.
Preferably, Electronic Nose detection system of the present invention has data analysis function, and described control module, according to the detection data of gas sensor unit, calculates the concentration of tested volatile gas, infers the current residing state of measured object with this.
The process of pressure enrichment formula detection of the present invention is: before sample introduction, the air cleaning air chamber after filtering with active carbon filter and gas sensor; During sample introduction, the output signal of the gas sensor of display after temperature and humidity compensation unit corrects in real time; After sampling, sample introduction is stopped when the tested gas in air chamber reaches more than 2 standard atmospheric pressures, after gas sensor response is stable, the gas sensor response after temperature and humidity compensation unit corrects and the ratio of the gas sensor response after active carbon filter filters are stored in storage unit; Calculate the average differential value of gas sensor, contrast the average differential standard value of each gas sensor response of the gas with various volatile concentrations customized in advance, draw the current residing state of measured object.
The present invention compared with prior art, has following beneficial effect:
1, the tested gas in air chamber controls more than 2 standard atmospheric pressures, improve the contact reaction concentration of the gaseous volatile matter such as synomone to be detected and gas sensor reaction part, reduce the requirement of electric nasus system to gas sensor sensitivity, add the alternative of gas sensor, reduce cost.
2, because the present invention is excellent according to having carried out selecting of sensor to the sensitivity of the main composition of the gaseous volatile matter such as synomone, gas sensor composition array without the need to needs 10 usual as conditional electronic nasus system or more has carried out the collection to synomone, reduces complexity and the cost of system.
3, multiple module is arranged in an Electronic Nose box body, using dry cell as power supply, avoid the dependence of conventional instrument to female type power supply, do not need to complete testing alone by other any equipment again, carry convenient, more adapt to the needs that outdoor environment detects in real time.And there is the function of data analysis, do not need sampled data to import when computer carries out analyzing can automatically complete simple analytical work yet, make operation simpler.
4, because the present invention has temperature and humidity compensation function, and humiture change is the maximum interference factor of sensor response, and therefore the present invention substantially increases the degree of accuracy of testing result.
5, the present invention adopts moveable data-storage card as the critical piece of memory module, therefore both can remember detection data, detection data importing computer can be done analyze further and identify again.
6, air chamber internal layer of the present invention and tracheae are made by the very little polytetrafluoroethylmaterial material of volatile organic matter absorption, substantially reduce the impact that instrument itself brings testing result.
7, present invention preserves that conditional electronic nasus system detection speed is fast, easy to use, steady performance; Relative conditional electronic nasus system volume is less, and weight is lighter, and power consumption is less, and antijamming capability is stronger, can realize the insect pest Real-Time Monitoring that a situation arises.
Accompanying drawing explanation
Fig. 1 is box-type encapsulating structure schematic diagram of the present invention;
Fig. 2 is the inner structure schematic diagram of Fig. 1;
Fig. 3 is plenum interior structural representation;
Fig. 4 is circuit control principle figure of the present invention;
Fig. 5 is the graph of a relation under different enrichment pressure between MQ-2 gas sensor response and air pressure change.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
See Fig. 1-3, pressure enrichment formula low amounts volatile gas Electronic Nose detection system of the present invention mainly comprises: for connecting and control the airflow control mechanism of gas circulation, for detecting the baroceptor 403 of air pressure, for obtaining the gas sensor unit 401 of tested volatile gas information, for the change of compensate for ambient humiture, gas sensor testing result is brought to the temperature and humidity compensation unit 402 of interference, for automatic control and the signal transacting of a whole set of electric nasus system, display, the embedded control unit 3 that button and data store, and power module 101, 4 buttons (start button 104a, stop key 104b, preserve button 104c and analysis button 104d), mainboard and display screen 102, all modules such as described airflow control mechanism, baroceptor, gas sensor unit, temperature and humidity compensation unit, embedded control unit, power module and mainboard are all arranged in Electronic Nose box body 1.
Gas sensor unit 401, primarily of no more than 5 gas sensors composition, selects the gas sensor to synomone (i.e. tested volatile gas) main constituent-sensitive.Such as: research shows, straight chain formula C11 monoterpene (instead)-4 is identified in the main volatile compounds (i.e. synomone) that the cotton of plant eater's invasion discharges, 8-dimethyl-1,3, (3 is anti-for 7-triolefin in the ninth of the ten Heavenly Stems and C11 monoterpene, 7 is anti-)-4,8,12-trimethyl-1,3,7,11-tridecane tetraene etc., therefore, when detecting cotton disease worm, no more than 5 sensors responsive to above-mentioned several material (monoterpenes, alkene class etc.) respectively can be selected to form gas sensor unit 401.
Due to the synomone composition difference to some extent discharged when different plants is subject to pest infestation, the how many sequence of the generic synomone component content that different plant discharges when being subject to pest infestation is also not necessarily identical; Therefore gas sensor can be different according to the difference by measuring plants, to improve the accuracy detected further.
The performance of gas sensor unit 401 is more stable under normal circumstances, but is vulnerable to the impact of humiture change.The present invention introduces temperature and humidity compensation unit 402, is in series respectively by the thermo-sensitive resistor identical or close with humidity coefficient with each gas sensor temperature coefficient and hygristor with corresponding gas sensor.
Airflow control mechanism of the present invention comprises: active carbon filter 206, for providing the pure air of cleaning air chamber and gas sensor; Tracheae, for connecting each parts of airflow control mechanism and conveying gas, comprises sample intake passage 205a, flushing channel 205b and exhaust passage 205c; Solenoid valve 201, for controlling the switch of gas circuit, is arranged in tracheae, comprises sample intake passage solenoid valve 201a, flushing channel solenoid valve 201b and exhaust passage solenoid valve 201c; Retaining valve 203, controls the uniflux of gas; Air chamber 204, is connected between retaining valve 203 and exhaust passage solenoid valve 201c, built-in gas sensor unit 401, temperature and humidity compensation unit 402 and baroceptor 403; Air pump 202, is arranged on retaining valve 203 and between sample intake passage solenoid valve 201a, flushing channel solenoid valve 201b, provides power for during conveying gas.Wherein to be designed to anti-air pressure ability spherical preferably for air chamber 204, and its outer titanium alloy material good for anti-pressure ability is made, and the internal layer of air chamber 204 and tracheae are made by the very little polytetrafluoroethylmaterial material of volatile organic matter absorption.
Embedded control unit 3 of the present invention comprises embedded chip, and the key control circuit, display circuit, data storage circuitry and the signal circuit that are connected with embedded chip respectively.Embedded control unit 3 is mainly used in the automatic control of electric nasus system and signal transacting, display, button, air pressure control, data store and the function such as pattern-recognition.
The process of low amounts volatile gas of the present invention enrichment is by the air pump 202 in airflow control mechanism, retaining valve 203, air chamber 204 and solenoid valve 201c, and baroceptor 403 and embedded control unit 3 have been come.The initial value (sensor resistance after active carbon filter filters) setting each gas sensor is 1, when the synomone that rice plant discharges when being subject to pest infestation contacts with gas sensor unit, the resistance value of each gas sensor can be made to change, now can draw a series of response signal graph, after temperature and humidity compensation system, output signal is shown in real time in display screen.For realizing detecting low amounts volatile gas, when air pump 202 is started working, solenoid valve 201c closes, tested volatile gas enters air chamber 204 by retaining valve 203, and the air pressure in air chamber 204 starts to rise, and gas concentration is increased gradually, atmospheric pressure value in air chamber is real-time transmitted to embedded control unit by baroceptor 403, when the air pressure in air chamber 204 reaches 5 to 10 standard atmospheric pressures, embedded control unit controls air pump 202 and quits work, and air inlet stops; Treat that sensor response is stable, sampled data is stored in storage card, differential value is averaging to this response signal graph, the average differential standard value responded from each sensor of the different synomone concentration customized in advance compares, draw the concentration of synomone, infer the extent of injury of paddy rice with this, and shown by display screen.
As shown in Figure 3, Electronic Nose detection system of the present invention is powered by power module 101 pairs of embedded control unit 3, is sent that instruction carries out the cleaning of sensor to embedded control unit 3, data sampling, data store and data analysis by button 104.Cleaning and the gas sampling of sensor is carried out by embedded control unit 3 Controlling solenoid valve and air pump 202, air pressure in air chamber is real-time transmitted to embedded control unit 3 by baroceptor 403, the sampled data of gas sensor unit 401 is after temperature and humidity compensation unit 402 corrects, send embedded control unit 3 to, then send display screen 102 and storage unit 103 to by embedded control unit 3.Preferably, described power module 101 adopts dry cell.
The concrete using method of the present invention is as follows: when pressing start button 104a, flushing channel solenoid valve 201b and exhaust passage solenoid valve 201c opens, sample intake passage solenoid valve 201a closes, air pump 202 is started working, waste gas after cleaning is discharged by exhaust passage 205c, and the response of each gas sensor of this process shows on the display screen 102 in real time.After 90s, the response of gas sensor returns 1, gas sensor unit 401 completes with the cleaning of air chamber 202, flushing channel solenoid valve 201b and exhaust passage solenoid valve 201c closes, sample intake passage solenoid valve 201a opens, sampling starts, this Process Gas dependent sensor 203 shows on the display screen 102 in real time with the response of baroceptor 207, when the detected value of baroceptor 207 reaches 5 to 10 standard atmospheric pressures, sample intake passage solenoid valve 201a closes, air pump 202 stops bleeding, and sample introduction work completes.By stop key 104b, sampling work is stopped in sampling process, when pressing stop key 104b, sample intake passage solenoid valve 201a closes, flushing channel solenoid valve 201b and exhaust passage solenoid valve 201c opens, when the air pressure of its air chamber 204 recovers standard atmospheric pressure, air pump 202 is started working, and sampling stops.After sensor response is stable, sampling channel solenoid valve 201a closes, and flushing channel solenoid valve 201b and exhaust passage solenoid valve 201c opens, and when the air pressure of its air chamber 204 recovers standard atmospheric pressure, air pump 202 is started working.Now optionally press save key 104c sampled data is carried out in preservation and storage unit 103.Also directly can press anal key 104d to data analysis, draw synomone concentration and infer by infringement degree with this.
The present embodiment is detected as example with inflammable gas, the concentration value of Smoke Detection gas sensor MQ-2 to the aerosol gases that pressure enrichment method of the present invention is collected, analyze the change of aerosol gases concentration under different air pressure, thus the feasibility of pressure enrichment method is verified.
The realization of pressure enrichment method represents the gas sensor unit 401 in the present invention with MQ-2 inflammable gas, Smoke Detection module, its concentration range is 300-10000ppm; The control module 3 in the present invention is represented with STC12C5A60S2 single-chip microcomputer and relevant control circuit; Using 4 joints dry cell (1.5v/ joint) as power module 101 (6v) of the present invention; The smog produced using cigarette combustion and the potpourri of air are as volatile gas to be measured; Plastics gas collection ball, for collecting volatile gas to be measured for test; To represent baroceptor 403 in the present invention and air chamber 204 respectively with barometric air collector, for collecting aerosol gases and the display tank internal gas pressure value in real time of different air pressure; Air pump represents the air pump 202 in the present invention, suction gas in air collector or gas collection ball; The display screen 102 in the present invention is represented, for showing the concentration of the aerosol gases that MQ-2 detection module detects with computer.Wireless transport module, communicates with surveying between computer for MQ-2 detection module.The resistance value of sensor can be caused to change when wherein MQ-2 gas sensor touches smog, and the change of voltage is converted into by driving circuit, by AD conversion, the analog quantity of change in voltage is being converted to digital quantity, thus is obtaining the concentration value of smog, its concentration range is 0-791.
Produce the mixed gas of smog and air to the enough cigarette combustion of suction in plastics gas collection ball with air pump, and by the smokescope in MQ-2 sensor detection module detected set balloon; Be sealed in air collector by MQ-2 sensor detection module, the initial gas in tank is air, and the initial gas pressure in tank is standard atmospheric pressure; In aerosol gases suction air collector gas collection ball collected with air pump, often increase by 0.5 times of standard atmospheric pressure (1 standard atmospheric pressure is about 100kp) and record gas concentration in a tank.
The smokescope recorded in plastics gas collection ball is 0, illustrates that gaseous volatilization substrate concentration to be measured is lower, and the gas sensor be not enough to by range is 300-10000ppm detects.The smog response that under different air pressure, MQ-2 sensor detection module gathers as shown in Figure 5.In air collector, atmospheric pressure is when 1-2.5 times of standard atmospheric pressure, and in tank, smog is lower, still cannot be detected by MQ-2 sensor.But along with the increase gradually of pressure in air collector, in tank, amount of smoke raises gradually, when in tank, gas enrichment pressure reaches 3 times of standard atmospheric pressures, it is 63 that MQ-2 sensor exports the response of smokescope; Along with pressure in tank continues to rise, the output response of sensor constantly increases.It is feasible that this test demonstrates pressure enrichment method of the present invention to the responsiveness of raising sensor to volatile gas to be measured, and effectively can solve conditional electronic nasus system needs because synomone concentration is low to adopt ppb level gas sensor thus the technical matters involved great expense.
Above-described embodiment is one embodiment of the present invention; but embodiments of the present invention do not limit therewith; be engaged in these those skilled in the art do not deviate from the present invention spirit and principle under make any amendment, replacement, improvement, be all included in protection scope of the present invention.
Claims (10)
1. pressure enrichment formula low amounts volatile gas Electronic Nose detection system, comprise gas sensor unit, it is characterized in that, also comprise airflow control mechanism and control module, described airflow control mechanism is provided with the air chamber for the tested volatile gas of enrichment, and described gas sensor unit is arranged in described air chamber; Described control module is connected with gas sensor unit, airflow control mechanism respectively, and the controlled atmosphere in air chamber is in control module.
2. pressure enrichment formula low amounts volatile gas Electronic Nose detection system according to claim 1, it is characterized in that, the air pressure controlled unit in described air chamber controls more than 2 standard atmospheric pressures.
3. pressure enrichment formula low amounts volatile gas Electronic Nose detection system according to claim 1, is characterized in that, also comprise and being arranged on for detecting the baroceptor of air chamber internal gas pressure in air chamber, described baroceptor is connected with control module.
4. pressure enrichment formula low amounts volatile gas Electronic Nose detection system according to claim 1, it is characterized in that, described air chamber is provided with air intake opening and exhausr port, and air intake opening place is provided with retaining valve, and described airflow control mechanism is provided with the air pump to air chamber air inlet.
5. pressure enrichment formula low amounts volatile gas Electronic Nose detection system according to claim 4, it is characterized in that, described airflow control mechanism is provided with inlet channel, flushing channel and exhaust passage, described inlet channel and flushing channel all lead to the air intake opening of air chamber, and described exhaust passage communicates with the exhausr port of air chamber.
6. pressure enrichment formula low amounts volatile gas Electronic Nose detection system according to claim 1, it is characterized in that, described air chamber is designed to spherical or is the cylindrical compression tank of dome head, and air chamber skin is made up of titanium alloy material, and air chamber internal layer scribbles polytetrafluoroethylmaterial material.
7. pressure enrichment formula low amounts volatile gas Electronic Nose detection system according to claim 1, it is characterized in that, described gas sensor unit forms by the gas sensor of the main constituent-sensitive of tested volatile gas.
8. pressure enrichment formula low amounts volatile gas Electronic Nose detection system according to claim 1, is characterized in that, also comprises the temperature and humidity compensation unit being arranged on and for the change of compensate for ambient humiture, gas sensor testing result being brought to interference in air chamber.
9. pressure enrichment formula low amounts volatile gas Electronic Nose detection system according to claim 1, it is characterized in that, described control module, according to the detection data of gas sensor unit, calculates the concentration of tested volatile gas, infers the current status of measured object with this.
10. pressure enrichment formula low amounts volatile gas Electronic Nose detection system according to claim 1, it is characterized in that, also comprise the dry cell be connected with control module, described dry cell, airflow control mechanism and control module are arranged in a box body.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108955772A (en) * | 2018-08-13 | 2018-12-07 | 宁夏爱打听科技有限公司 | A kind of poultry house quality of air environment detection system and its application method |
| CN110333319A (en) * | 2019-06-28 | 2019-10-15 | 天津大学 | The interior ppb grades of low concentration oder levels evaluation methods based on hand-hold electric nasus |
| KR102567747B1 (en) * | 2022-10-21 | 2023-08-25 | 주식회사 케이에너지시스템 | Gas measuring apparatus and gas measuring method thereof |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10104203A (en) * | 1996-09-27 | 1998-04-24 | Nippon Sanso Kk | Method of analyzing trace impurity in gas |
| CN1301342A (en) * | 1998-03-20 | 2001-06-27 | 塞莱诺科学股份有限公司 | Handheld sensing apparatus |
| CN1588030A (en) * | 2004-07-09 | 2005-03-02 | 大连理工大学 | Portable gas detection analyzer with temperature and humidity compensation function |
| CN1687765A (en) * | 2005-03-31 | 2005-10-26 | 浙江大学 | Portable gas detector |
| GB2413637A (en) * | 2004-04-20 | 2005-11-02 | Draeger Safety Ag & Co Kgaa | A gas sensor utilising pressure modulations of the sensed gas |
| CN101354394A (en) * | 2008-09-08 | 2009-01-28 | 无锡尚沃生物科技有限公司 | Expiration nitric oxide detection device |
| CN102109487A (en) * | 2009-12-28 | 2011-06-29 | 华瑞科学仪器(上海)有限公司 | Ultra-low concentration gas sensor |
| CN102445473A (en) * | 2011-11-16 | 2012-05-09 | 北京明尼特环保科技有限公司 | Method and system for monitoring and analyzing air |
| CN203324220U (en) * | 2013-06-21 | 2013-12-04 | 南京信息工程大学 | Multi-component gas monitoring device |
-
2014
- 2014-08-18 CN CN201410406146.6A patent/CN104280427A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10104203A (en) * | 1996-09-27 | 1998-04-24 | Nippon Sanso Kk | Method of analyzing trace impurity in gas |
| CN1301342A (en) * | 1998-03-20 | 2001-06-27 | 塞莱诺科学股份有限公司 | Handheld sensing apparatus |
| GB2413637A (en) * | 2004-04-20 | 2005-11-02 | Draeger Safety Ag & Co Kgaa | A gas sensor utilising pressure modulations of the sensed gas |
| CN1588030A (en) * | 2004-07-09 | 2005-03-02 | 大连理工大学 | Portable gas detection analyzer with temperature and humidity compensation function |
| CN1687765A (en) * | 2005-03-31 | 2005-10-26 | 浙江大学 | Portable gas detector |
| CN101354394A (en) * | 2008-09-08 | 2009-01-28 | 无锡尚沃生物科技有限公司 | Expiration nitric oxide detection device |
| CN102109487A (en) * | 2009-12-28 | 2011-06-29 | 华瑞科学仪器(上海)有限公司 | Ultra-low concentration gas sensor |
| CN102445473A (en) * | 2011-11-16 | 2012-05-09 | 北京明尼特环保科技有限公司 | Method and system for monitoring and analyzing air |
| CN203324220U (en) * | 2013-06-21 | 2013-12-04 | 南京信息工程大学 | Multi-component gas monitoring device |
Non-Patent Citations (1)
| Title |
|---|
| 程彬 等: "《植物挥发物的收集方法》", 《吉林林业科技》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108955772A (en) * | 2018-08-13 | 2018-12-07 | 宁夏爱打听科技有限公司 | A kind of poultry house quality of air environment detection system and its application method |
| CN110333319A (en) * | 2019-06-28 | 2019-10-15 | 天津大学 | The interior ppb grades of low concentration oder levels evaluation methods based on hand-hold electric nasus |
| KR102567747B1 (en) * | 2022-10-21 | 2023-08-25 | 주식회사 케이에너지시스템 | Gas measuring apparatus and gas measuring method thereof |
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