CN112730592A - Gas detection system device and detection method thereof - Google Patents
Gas detection system device and detection method thereof Download PDFInfo
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- CN112730592A CN112730592A CN202011580786.0A CN202011580786A CN112730592A CN 112730592 A CN112730592 A CN 112730592A CN 202011580786 A CN202011580786 A CN 202011580786A CN 112730592 A CN112730592 A CN 112730592A
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- 238000001514 detection method Methods 0.000 title claims abstract description 154
- 238000001871 ion mobility spectroscopy Methods 0.000 claims abstract description 85
- 238000001824 photoionisation detection Methods 0.000 claims abstract description 70
- 238000007405 data analysis Methods 0.000 claims abstract description 60
- 231100000331 toxic Toxicity 0.000 claims abstract description 26
- 230000002588 toxic effect Effects 0.000 claims abstract description 26
- 238000004458 analytical method Methods 0.000 claims abstract description 17
- 238000001914 filtration Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 15
- 230000007613 environmental effect Effects 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- 238000011010 flushing procedure Methods 0.000 claims description 8
- 239000002957 persistent organic pollutant Substances 0.000 claims description 8
- 239000012528 membrane Substances 0.000 claims description 7
- 239000004677 Nylon Substances 0.000 claims description 6
- 229920001778 nylon Polymers 0.000 claims description 6
- 239000007789 gas Substances 0.000 abstract description 130
- 238000004451 qualitative analysis Methods 0.000 abstract description 11
- 238000004445 quantitative analysis Methods 0.000 abstract description 10
- 238000001228 spectrum Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 230000035945 sensitivity Effects 0.000 description 5
- 239000000523 sample Substances 0.000 description 4
- 239000005388 borosilicate glass Substances 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 239000002341 toxic gas Substances 0.000 description 2
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- 230000003444 anaesthetic effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000027734 detection of oxygen Effects 0.000 description 1
- PJMPHNIQZUBGLI-UHFFFAOYSA-N fentanyl Chemical compound C=1C=CC=CC=1N(C(=O)CC)C(CC1)CCN1CCC1=CC=CC=C1 PJMPHNIQZUBGLI-UHFFFAOYSA-N 0.000 description 1
- 229960002428 fentanyl Drugs 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000012488 sample solution Substances 0.000 description 1
- 238000012764 semi-quantitative analysis Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 231100000167 toxic agent Toxicity 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
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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
- G01N27/622—Ion mobility spectrometry
-
- 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
- G01N27/66—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 and measuring current or voltage
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- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
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- Spectroscopy & Molecular Physics (AREA)
- Toxicology (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
The invention provides a gas detection system device and a gas detection method, wherein the gas detection system device comprises a photoionization detection device and an ion mobility spectrum detection device, and the system device also comprises a data analysis module which is respectively and independently electrically connected with the photoionization detection device and the ion mobility spectrum detection device; and the data analysis module receives detection signals sent by the ion mobility spectrometry detection device and the photoionization detection device, and outputs a detection result after analysis. The detection system device provided by the invention can carry out qualitative and quantitative analysis on toxic and harmful gases through the detection results of the photoionization detection device and the ion mobility spectrometry detection device and the comprehensive analysis of the data analysis module, and has the characteristics of simple structure, accurate detection effect and the like.
Description
Technical Field
The invention belongs to the technical field of gas detection, and particularly relates to a gas detection system device and a detection method thereof.
Background
At present, the detection requirement on toxic and harmful gases is higher and higher, and a single detection technology and a single detection method are sometimes difficult to meet. The ion mobility spectrometry technology has high sensitivity and strong selectivity, and is mainly used for qualitative analysis of military toxicants and industrial toxic and harmful gases; the photoionization detector has wide detection range and is mainly used for quantitative analysis of volatile organic pollutants and part of industrial toxic and harmful gases; other sensors such as electrochemical sensors can specifically analyze a certain toxic and harmful gas, but have limited detection types, and semiconductor gas sensors have wide detection range but poor quantitative linearity.
CN106053588A discloses a method for rapidly detecting alkylphenol ethoxylates based on ion mobility spectrometry, which comprises the following steps: (A) manufacturing an ion sputtering coating capillary tube spray ionization device: the method comprises the steps of preparing a coated borosilicate glass capillary tube and assembling an ion sputtering coated capillary tube spray ionization device; (B) and (3) carrying out rapid detection by adopting an ion mobility spectrometry: transferring the sample solution to be detected to a coated borosilicate glass capillary tube, placing the coated borosilicate glass capillary tube at the front end of an electrospray injection port of an ion mobility spectrometry host, setting parameters of the ion mobility spectrometry host, ionizing the sample, entering a migration tube for separation, and detecting the sample by a Faraday cup detector to obtain a corresponding spectrum. The method can ensure the accuracy of the detection data, greatly reduce the detection cost, improve the detection efficiency and provide a possible method for rapidly detecting the alkylphenol ethoxylates for real-time online detection.
CN210269707U discloses a detector for detecting chemical toxic gas by ion mobility spectrometry, which comprises a display module, a machine body housing, and an ion mobility spectrometry detector and a circuit board arranged in the housing; the shell of the machine body is provided with a gas inlet and a gas outlet, more than two gas passages are arranged between the gas inlet and the gas outlet, an ion mobility spectrometry detector is arranged on the gas passage I, and a gas sensor array sensor is arranged on the gas passage II; the circuit board is provided with a processor which is respectively connected with the ion mobility spectrometry detector, the gas sensitive element array sensor and the display module, and the ion mobility spectrometry detector and the gas sensitive element array sensor are used for detecting gas to be detected and sending signals to the processor. The detector detects chemical toxic gas by an ion mobility spectrometry technology, and semi-quantitative detection of oxygen, combustible gas and chemical gas is realized.
CN103134848A discloses a qualitative and quantitative analysis method for fast detecting sample by ion mobility spectrometry. The qualitative and semi-quantitative analysis method for detecting different samples by using the ion mobility spectrometry in the positive and negative ion modes is established, and the self-established ion mobility spectrometry analysis software can automatically generate a standard curve, automatically introduce a standard curve equation and automatically alarm to display the number of samples. The invention takes a citric acid fentanyl anaesthetic sample (FK) as an example, a standard curve equation y is 1.3451+0.4044x is established between 1 ng and 60ng, and a correlation coefficient r is greater than 0.99.
The existing gas detection device has the problems of inaccurate detection result and the like of toxic and harmful gases, so that the problem that how to qualitatively and quantitatively analyze the toxic and harmful gases under the condition that the gas detection device is simple in structure is solved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a gas detection system device and a detection method thereof, which can accurately perform qualitative and quantitative analysis on various toxic and harmful gases by combining a photoionization detection device and an ion mobility spectrometry detection device and analyzing through a data analysis module, and have the characteristics of simple structure, accurate detection result and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a gas detection system apparatus, which includes a photoionization detection apparatus and an ion mobility spectrometry detection apparatus, and further includes a data analysis module, where the data analysis module is separately and electrically connected to the photoionization detection apparatus and the ion mobility spectrometry detection apparatus; and the data analysis module receives detection signals sent by the ion mobility spectrometry detection device and the photoionization detection device, and outputs a detection result after analysis.
The invention can carry out accurate qualitative and quantitative analysis on the toxic and harmful gas through the combination of the photoionization detection device and the ion mobility spectrometry detection device and the analysis of the data analysis module. Firstly, qualitative analysis is carried out on toxic and harmful gases through an ion mobility spectrometry technology, and the method has the characteristics of high sensitivity, strong selectivity, high accuracy and the like; and secondly, by combining with a photoionization detection device, the system device can further perform quantitative analysis on toxic and harmful gases, and finally, the gases can be accurately qualitatively and quantitatively analyzed through the comprehensive analysis of a data analysis module, so that the system device provided by the invention has the characteristics of simple structure, high accuracy, strong adaptability and the like.
As a preferable technical solution of the present invention, the system device further includes an air intake main pipe, the air intake main pipe is divided into a first pipe and a second pipe which are independent of each other, the first pipe is connected to a photoionization detection device, and the second pipe is connected to an ion mobility spectrometry detection device.
As a preferred technical solution of the present invention, the air intake main pipe is provided with a filtering device and an air intake pump in sequence along an air intake direction.
Preferably, said filtration means comprises a filtration membrane.
Preferably, the material of the filtering membrane comprises nylon and/or polyfluoro material.
It should be noted that, the invention does not make specific requirements and special limitations on the specific types of the nylon material and the polyfluoro material, and those skilled in the art can reasonably select the types of the nylon material and the polyfluoro material according to actual requirements, for example, the nylon material is nylon 66, and the polyfluoro material is polytetrafluoroethylene, etc.
Preferably, the filtration device is provided with a rain guard.
Preferably, the rain-proof device is a rain-proof cap.
As a preferred embodiment of the present invention, the first pipeline is provided with a first flow valve, and the second pipeline is provided with a second flow valve.
The first flow valve and the second flow valve are respectively and independently electrically connected with the data analysis module, and the data analysis module respectively and independently controls the opening of the first flow valve and the opening of the second flow valve.
The invention can respectively control the starting of the photoionization detection device and the ion mobility spectrometry detection device by adjusting the first flow valve and the second flow valve, and control the gas flow by adjusting the opening degree of the first flow valve and the opening degree of the second flow valve, thereby independently using the photoionization detection device or the ion mobility spectrometry detection device to be suitable for different working environments.
As a preferable technical scheme of the invention, the air outlet end of the photoionization detection device is sequentially provided with a one-way valve and a waterproof breathable film along the air flow direction.
As a preferred technical solution of the present invention, the ion mobility spectrometry detection apparatus includes an ionization region and a drift region, and further includes a gas bypass, an inlet and an outlet of the gas bypass are respectively located at two ends of the drift region, and after the gas enters the ionization region for ionization, the gas entering the gas bypass performs blowback on the gas entering the drift region.
The gas bypass is arranged in the drift region, part of gas enters the gas bypass, and back flushing is carried out on the gas entering the drift region, so that the gas in the drift region and the airflow blown out by the gas bypass are collided and separated, the detection accuracy of the ion mobility spectrometry detection device is improved, in addition, the dryness and cleanness in the drift region can be ensured through the back flushing of the gas, the influence of the accumulation of impurities in the drift region on the detection result is avoided, and the ion mobility spectrometry detection device has the characteristics of simple structure, accurate detection effect and the like.
It should be noted that the ion mobility spectrometry detection apparatus necessarily includes elements such as a power supply, a receiving plate, a signal amplifier, etc., and the present invention does not require specific requirements or special limitations, and those skilled in the art can reasonably arrange the elements according to actual requirements.
It should be noted that, the invention does not make specific requirements and special limitations on the amount of gas entering the gas bypass, the amount of gas entering the gas bypass is related to the flow rate of the bypass pump, and those skilled in the art can reasonably select the amount of gas entering the gas bypass on the premise of not affecting the detection result according to the operation requirement.
Preferably, a bypass pump and a purifier are sequentially arranged on the gas bypass along the gas flow direction.
As a preferred technical solution of the present invention, the system device further includes a sensor group electrically connected to the data analysis module, and the sensor group is used for detecting an environmental parameter.
The data analysis module is used for respectively receiving signals of the sensor group, the photoionization detection device and the ion mobility spectrometry detection device, wherein the sensor group detects environmental parameters, the environmental parameter data are transmitted to the data analysis module, the data analysis module corrects the results of the photoionization detection device and the ion mobility spectrometry detection device on the basis of the environmental parameters detected by the sensor group, and after comprehensive analysis, the detection results are output.
As a preferred technical solution of the present invention, the sensor group includes a temperature sensor, a humidity sensor and an air pressure sensor.
In a second aspect, the present invention provides a method for gas detection using the gas detection system apparatus according to the first aspect, the method comprising:
the gas respectively enters an ion mobility spectrometry detection device and a photoionization detection device for detection, and a data analysis module receives signals sent by the ion mobility spectrometry detection device and the photoionization detection device and outputs a detection result after analysis.
As a preferred technical solution of the present invention, the detection method specifically includes the following steps:
gas respectively enters a photoionization detection device and an ion mobility spectrometry detection device for detection after passing through a filtering device;
(II) after ionization of gas entering the ion mobility spectrometry detection device, partial gas enters a drift region, residual gas enters a gas bypass and is dehumidified by a purifier to carry out back flushing on the gas entering the drift region, and after the gas passes through the drift region, the ion mobility spectrometry detection device feeds back a detection signal to a data analysis module; the gas entering the photoionization detection device is purified by the check valve and the waterproof breathable film and then discharged, and the photoionization detection device feeds back a detection signal to the data analysis module; a sensor group detects environmental parameters;
(III) the data analysis module receives signals of the sensor group, the photoionization detection device and the ion mobility spectrometry detection device respectively, and when the photoionization detection device and the ion mobility spectrometry detection device both respond, the data analysis module judges that the gas is toxic and harmful, and outputs a detection gas concentration result; when both the photoionization detection device and the ion mobility spectrometry detection device do not respond, the data analysis module judges that no suspicious gas exists; when the photoionization detection device does not respond and the ion mobility spectrometry detection device responds, the data analysis module judges that toxic and harmful gas is contained; when the photoionization detection device responds and the ion mobility spectrometry detection device does not respond, the data analysis module judges that the gas contains volatile organic pollutants and outputs a detection gas concentration result.
When the detection result is volatile organic pollutant, if the gas type of the volatile organic pollutant is known, the detection result of the photoionization detection device is the reference concentration of the known gas; if the gas type is unknown, the result detected by the photoionization detection device is the total VOC concentration.
Compared with the prior art, the invention has the beneficial effects that:
the invention can carry out accurate qualitative and quantitative analysis on the toxic and harmful gas through the combination of the photoionization detection device and the ion mobility spectrometry detection device and the analysis of the data analysis module. Firstly, qualitative analysis is carried out on toxic and harmful gases through an ion mobility spectrometry technology, and the method has the characteristics of high sensitivity, strong selectivity, high accuracy and the like; and secondly, by combining with a photoionization detection device, the system device can further perform quantitative analysis on toxic and harmful gases, and finally, the gases can be accurately qualitatively and quantitatively analyzed through the comprehensive analysis of a data analysis module, so that the system device provided by the invention has the characteristics of simple structure, high accuracy, strong adaptability and the like.
Drawings
FIG. 1 is a schematic diagram of a gas detection system apparatus according to one embodiment of the present invention;
fig. 2 is a schematic structural diagram of an ion mobility spectrometry detection apparatus according to an embodiment of the present invention.
Wherein, 1-photoionization detection means; 2-ion mobility spectrometry detection means; 3-a data analysis module; 4-a filtration device; 5-an air inlet pump; 6-a first flow valve; 7-a second flow valve; 8-waterproof breathable film; 9-a one-way valve; 10-a bypass pump; 11-a purifier; 12-a sensor group; 13-an ionization region; 14-a drift region; 15-a power supply; 16-a receiving plate; 17-signal amplifier.
Detailed Description
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention.
It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical solution of the present invention is further explained by the following embodiments.
In one embodiment, the present invention provides a gas detection system apparatus, as shown in fig. 1, the system apparatus includes a photoionization detection apparatus 1 and an ion mobility spectrometry detection apparatus 2, the system apparatus further includes a data analysis module 3, the data analysis module 3 is respectively and independently electrically connected to the photoionization detection apparatus 1 and the ion mobility spectrometry detection apparatus 2; the gas respectively enters the ion mobility spectrometry detection device 2 and the photoionization detection device 1 for detection, and the data analysis module 3 receives detection signals sent by the ion mobility spectrometry detection device 2 and the photoionization detection device 1 and outputs a detection result after analysis.
According to the invention, the photoionization detection device 1 and the ion mobility spectrometry detection device 2 are combined, and the toxic and harmful gases can be accurately qualitatively and quantitatively analyzed through the analysis of the data analysis module 3. Firstly, qualitative analysis is carried out on toxic and harmful gases through an ion mobility spectrometry technology, and the method has the characteristics of high sensitivity, strong selectivity, high accuracy and the like; and secondly, by combining the photoionization detection device 1, the system device can further perform quantitative analysis on toxic and harmful gases, and finally, the gases can be accurately qualitatively and quantitatively analyzed through the comprehensive analysis of the data analysis module 3, so that the system device provided by the invention has the characteristics of simple structure, high accuracy, strong adaptability and the like.
Furthermore, the system device also comprises an air inlet main pipe, the air inlet main pipe is divided into a first pipeline and a second pipeline which are mutually independent, the first pipeline is connected into the photoionization detection device 1, and the second pipeline is connected into the ion mobility spectrometry detection device 2. The air inlet main pipe is sequentially provided with a filtering device 4 and an air inlet pump 5 along the air inlet direction, furthermore, the filtering device 4 comprises a filtering membrane, and the filtering membrane is made of nylon and/or fluorine-gathering materials.
Further, the filter device 4 is provided with a rain guard, further preferably a rain hat.
Furthermore, a first flow valve 6 is arranged on the first pipeline, and a second flow valve 7 is arranged on the second pipeline; the first flow valve 6 and the second flow valve 7 are respectively and independently electrically connected with the data analysis module 3, and the data analysis module 3 respectively and independently controls the opening degree of the first flow valve 6 and the opening degree of the second flow valve 7. The invention can respectively control the start of the photoionization detection device 1 and the ion mobility spectrometry detection device 2 by adjusting the first flow valve 6 and the second flow valve 7, and control the gas flow by adjusting the opening degree of the first flow valve 6 and the opening degree of the second flow valve 7, thereby independently using the photoionization detection device 1 or the ion mobility spectrometry detection device 2 to be suitable for different working environments.
Further, the air outlet end of the photoionization detection device 1 is sequentially provided with a check valve 9 and a waterproof breathable film 8 along the gas flow direction.
Further, as shown in fig. 2, the ion mobility spectrometry detection device 2 includes an ionization region 13 and a drift region 14, the ion mobility spectrometry detection device 2 further includes a gas bypass, an inlet and an outlet of the gas bypass are respectively located at two ends of the drift region 14, a bypass pump 10 and a purifier 11 are sequentially arranged on the gas bypass along a gas flow direction, after the gas enters the ionization region 13 for ionization, the gas entering the gas bypass performs blowback on the gas entering the drift region 14, and the ion mobility spectrometry detection device 2 further includes elements such as a power supply 15, a receiving electrode plate 16 and a signal amplifier 17. According to the invention, the gas bypass is arranged in the drift region 14, part of gas enters the gas bypass, and the gas entering the drift region 14 is subjected to back flushing, so that the gas in the drift region 14 and the gas flow blown out by the gas bypass are subjected to collision separation, the detection accuracy of the ion mobility spectrometry detection device 2 is improved, in addition, the dryness and cleanness in the drift region 14 can be ensured through the back flushing of the gas, the influence of the accumulation of impurities in the drift region 14 on the detection result is avoided, and the ion mobility spectrometry detection device has the characteristics of simple structure, accurate detection effect and the like.
Further, the system device further comprises a sensor group 12 electrically connected to the data analysis module 3, wherein the sensor group 12 is used for detecting an environmental parameter, and further, the sensor group 12 comprises a temperature sensor, a humidity sensor and a pressure sensor. The invention utilizes the data analysis module 3 to respectively receive signals of the sensor group 12, the photoionization detection device 1 and the ion mobility spectrometry detection device 2, wherein the sensor group 12 detects environmental parameters and transmits the environmental parameter data to the data analysis module 3, the data analysis module 3 corrects the results of the photoionization detection device 1 and the ion mobility spectrometry detection device 2 based on the environmental parameters detected by the sensor group 12, and outputs the detection results after comprehensive analysis.
In another embodiment, the present invention provides a method for detecting gas by using the above gas detection system apparatus, wherein the detection method specifically comprises the following steps:
gas respectively enters a photoionization detection device 1 and an ion mobility spectrometry detection device 2 for detection after passing through a filter device 4;
(II) after the gas entering the ion mobility spectrometry detection device 2 is ionized by the ionization region 13, part of the gas enters the drift region 14, the rest of the gas enters the gas bypass and is dehumidified by the purifier 11, the gas entering the drift region 14 is subjected to back flushing, and after the gas passes through the drift region 14, the ion mobility spectrometry detection device 2 feeds back a detection signal to the data analysis module 3; the gas entering the photoionization detection device 1 is purified by the check valve 9 and the waterproof breathable film 8 and then discharged, and the photoionization detection device 1 feeds back a detection signal to the data analysis module 3; the sensor group 12 detects environmental parameters;
(III) the data analysis module 3 receives signals of the sensor group 12, the photoionization detection device 1 and the ion mobility spectrum detection device 2 respectively, and when the photoionization detection device 1 and the ion mobility spectrum detection device 2 both respond, the data analysis module 3 judges that the gas is toxic and harmful, and outputs a detection gas concentration result; when both the photoionization detection device 1 and the ion mobility spectrometry detection device 2 do not respond, the data analysis module 3 judges that no suspicious gas exists; when the photoionization detection device 1 does not respond and the ion mobility spectrometry detection device 2 responds, the data analysis module 3 judges that toxic and harmful gas is contained; when the photoionization detection device 1 responds and the ion mobility spectrometry detection device 2 does not respond, the data analysis module 3 judges that the gas contains volatile organic pollutants and outputs a detection gas concentration result. When the detection result is volatile organic pollutant, if the gas type of the volatile organic pollutant is known, the detection result of the photoionization detection device 1 is the reference concentration of the known gas; if the gas type is unknown, the result of detection by the photoionization detection device 1 is the total VOC concentration.
According to the invention, the photoionization detection device 1 and the ion mobility spectrometry detection device 2 are combined, and the toxic and harmful gases can be accurately qualitatively and quantitatively analyzed through the analysis of the data analysis module 3. Firstly, qualitative analysis is carried out on toxic and harmful gases through an ion mobility spectrometry technology, and the method has the characteristics of high sensitivity, strong selectivity, high accuracy and the like; and secondly, by combining the photoionization detection device 1, the system device can further perform quantitative analysis on toxic and harmful gases, and finally, the gases can be accurately qualitatively and quantitatively analyzed through the comprehensive analysis of the data analysis module 3, so that the system device provided by the invention has the characteristics of simple structure, high accuracy, strong adaptability and the like.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. The gas detection system device is characterized by comprising a photoionization detection device, an ion mobility spectrometry detection device and a data analysis module, wherein the data analysis module is respectively and independently electrically connected with the photoionization detection device and the ion mobility spectrometry detection device; and the data analysis module receives detection signals sent by the ion mobility spectrometry detection device and the photoionization detection device, and outputs a detection result after analysis.
2. The system device as claimed in claim 1, further comprising a main gas inlet pipe, wherein the main gas inlet pipe is divided into a first pipe and a second pipe which are independent of each other, the first pipe is connected to the photoionization detection device, and the second pipe is connected to the ion mobility spectrometry detection device.
3. The system device according to claim 2, wherein the air inlet main pipe is provided with a filtering device and an air inlet pump in sequence along the air inlet direction;
preferably, said filtration means comprises a filtration membrane;
preferably, the material of the filtering membrane comprises nylon and/or polyfluoro material;
preferably, the filtration device is provided with a rain guard;
preferably, the rain-proof device is a rain-proof cap.
4. The system arrangement as claimed in claim 2 or 3, characterized in that a first flow valve is arranged on the first line and a second flow valve is arranged on the second line;
the first flow valve and the second flow valve are respectively and independently electrically connected with the data analysis module, and the data analysis module respectively and independently controls the opening of the first flow valve and the opening of the second flow valve.
5. The system device according to any one of claims 1 to 4, wherein the gas outlet end of the photoionization detection device is provided with a one-way valve and a waterproof and breathable membrane in sequence along the gas flow direction.
6. The system device according to any one of claims 1 to 5, wherein the ion mobility spectrometry detection device comprises an ionization region and a drift region, the ion mobility spectrometry detection device further comprises a gas bypass, an inlet and an outlet of the gas bypass are respectively located at two ends of the drift region, and after the gas enters the ionization region for ionization, the gas entering the gas bypass performs back flushing on the gas entering the drift region;
preferably, a bypass pump and a purifier are sequentially arranged on the gas bypass along the gas flow direction.
7. The system-device of any one of claims 1-6, further comprising a sensor group electrically connected to the data analysis module, the sensor group configured to detect an environmental parameter.
8. The system apparatus as claimed in any one of claims 1-7, wherein said sensor group comprises a temperature sensor, a humidity sensor and a pressure sensor.
9. A method for performing gas sensing using the gas sensing system of any one of claims 1-8, the method comprising:
the gas respectively enters an ion mobility spectrometry detection device and a photoionization detection device for detection, and a data analysis module receives signals sent by the ion mobility spectrometry detection device and the photoionization detection device and outputs a detection result after analysis.
10. The detection method according to claim 9, characterized in that the detection method comprises the following steps:
gas respectively enters a photoionization detection device and an ion mobility spectrometry detection device for detection after passing through a filtering device;
(II) after ionization of gas entering the ion mobility spectrometry detection device, partial gas enters a drift region, residual gas enters a gas bypass and is dehumidified by a purifier to carry out back flushing on the gas entering the drift region, and after the gas passes through the drift region, the ion mobility spectrometry detection device feeds back a detection signal to a data analysis module; the gas entering the photoionization detection device is purified by the check valve and the waterproof breathable film and then discharged, and the photoionization detection device feeds back a detection signal to the data analysis module; a sensor group detects environmental parameters;
(III) the data analysis module receives signals of the sensor group, the photoionization detection device and the ion mobility spectrometry detection device respectively, and when the photoionization detection device and the ion mobility spectrometry detection device both respond, the data analysis module judges that the gas is toxic and harmful, and outputs a detection gas concentration result; when both the photoionization detection device and the ion mobility spectrometry detection device do not respond, the data analysis module judges that no suspicious gas exists; when the photoionization detection device does not respond and the ion mobility spectrometry detection device responds, the data analysis module judges that toxic and harmful gas is contained; when the photoionization detection device responds and the ion mobility spectrometry detection device does not respond, the data analysis module judges that the gas contains volatile organic pollutants and outputs a detection gas concentration result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011580786.0A CN112730592B (en) | 2020-12-28 | 2020-12-28 | Gas detection system device and detection method thereof |
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Denomination of invention: A gas detection system device and its detection method Granted publication date: 20230331 Pledgee: The Bank of Shanghai branch Caohejing Limited by Share Ltd. Pledgor: Shanghai xinman Sensor Technology Co.,Ltd. Registration number: Y2024980005936 |
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