CN103884671A - Nondispersive infrared (NDIR) CO2 gas sensor - Google Patents
Nondispersive infrared (NDIR) CO2 gas sensor Download PDFInfo
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- CN103884671A CN103884671A CN201410092699.9A CN201410092699A CN103884671A CN 103884671 A CN103884671 A CN 103884671A CN 201410092699 A CN201410092699 A CN 201410092699A CN 103884671 A CN103884671 A CN 103884671A
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Abstract
The invention discloses a CO2 gas sensor based on a nondispersive infrared method (NDIR). The CO2 gas sensor mainly comprises a circuit board and a gas chamber structure, wherein a circuit part comprises a light source driving circuit, a detector circuit and a main control board circuit; a gas chamber structure part is composed of a gas inlet chamber, a film coating gas chamber and a gas outlet chamber, the gas inlet chamber is provided with a spotlight cup by which a light source is emitted in a parallel beam manner, and the influence caused by infrared light of an undesired wave band and an external infrared ray entering a detector is eliminated through a diaphragm; grooves of the gas inlet chamber and the gas outlet chamber are internally provided with four sealing rings, the sealing rings can guarantee that indoor gas and the outside world are isolated, meanwhile, light filters are respectively fixed in the gas inlet chamber and the gas outlet chamber, and the film coating gas chamber, the gas inlet chamber and the gas outlet chamber are connected and fixed, so that central axes of the film coating gas chamber, the gas inlet chamber and the gas outlet chamber are consistent. The CO2 gas sensor disclosed by the invention has the advantages that the structure is simple and compact, the disassembly and cleaning are easy, the environmental disturbance is reduced as far as possible, the optical energy use ratio is improved, and the detection precision of the sensor is guaranteed.
Description
Technical field
The present invention relates to a kind of infrared optics gas sensor, be specifically related to a kind of based on not light splitting infrared method (NDIR) CO
2gas sensor.
Background technology
CO
2gas sensor is mainly used in gas station, combustion gas pump house (station), workshop, agricultural greenhouse, plastic green house, hotel, hotel, chemical plant, the fields such as metallurgical place of waiting gas to use or to store.For this gas concentration inspect, the most frequently used detection method mainly contains both at home and abroad at present: infrared gas sensor, semiconductor gas sensor, electrochemical gas sensor, catalytic combustion method gas sensor, thermal conductivity gas sensor etc.According to different principles, just should there is mutually the detecting device (conventionally claiming the sensor of instrument) of different structure, be applicable to respectively the different classes of gas componant of test.Compared with other method, utilize the infrared type gas sensor of not light splitting infrared method (NDIR) principle to there is lot of advantages, precision and highly sensitive, selectivity, stability and good reliability, reaction velocity is fast, is not easy poisoning, life-span is long, broad quantum, and antijamming capability is strong etc.
Not light splitting infrared method (NDIR) principle is under spectrum effect, to have showed different absorption peak owing to vibrating and rotating to change based on different compounds.The absorption spectrum of gas can there are differences with the difference of material, the chemical constitution difference of gas with various molecule, just cause the degree of absorption difference of the infrared radiation to different wave length, that is: absorption spectrum corresponding to different objects, and every kind of gas is in its spectrum, the light of specific wavelength is had to stronger absorption.In the time that the infrared radiation of different wave length is irradiated to sample material successively, the radiation energy of some wavelength is selected to absorb by sample material and is died down, produce infrared absorption spectrum, therefore in the time knowing the infrared absorption spectrum of certain material, just can therefrom obtain the absorption peak of this material in infrared region.When same material variable concentrations, have different absorption intensities in same absorption peak position, absorption intensity and concentration are proportional, by detecting the impact of gas on light wavelength and intensity, just can determine the concentration of gas.
About the research of infrared gas sensor technology, developed countries is started to walk relatively early, comparative maturity of infrared gas sensor technology, and the product of producing is also good stability, precision is high, has almost occupied domestic infrared CO
2the whole market of gas sensor, and expensive.Not light splitting of China infrared (NDIR) gas sensor technology is still immature, also there is research although domestic, but theoretical foundation does not deeply reach system yet, and automatization level is not high, cause product reliability poor, exist huge spread with Foreign Advanced Lerel, so key element remains from external import.The sensor of domestic production is at present mainly electrochemical gas sensor, has a lot of weak points: the shortcomings such as error ratio is large, data are unstable, and serviceable life is short.
Summary of the invention
The present invention is directed to the shortcoming that existing gas sensor exists, development not light splitting of one infrared (NDIR) CO
2gas sensor, has the advantages such as cost is low, good stability, precision is high, reliability is high, the life-span is long.
A kind of based on not light splitting infrared method (NDIR) CO
2gas sensor, mainly being formed by circuit board and air chamber structure of system, wherein circuit board comprises light source driving circuit plate, detector circuit plate and master control borad, air chamber structure part comprises inlet plenum, plated film air chamber and discharge chamber, it is characterized in that: described light source driving circuit plate, detector circuit plate and master control borad are fixedly connected with respectively at left end, right-hand member and bottom with air chamber by screw; Described light source and infrared eye are separately fixed at light source driving circuit plate and detector circuit plate, and are placed on inlet plenum and discharge chamber; Respectively there are two grooves and a diaphragm in described inlet plenum and discharge chamber inside, and O-ring seal is stuck in groove; Plated film air chamber is joined and is incorporated in inlet plenum and is fixedly connected with discharge chamber by plated film air chamber groove and O-ring seal; The light beam that described light source sends is by the parallel ejaculation of prefocus cup, and by diaphragm, on directive infrared eye, detector is connected with detecting plate circuit.
Described light source, infrared eye, plated film air chamber three's center must be on same straight line.
Described plated film air chamber adopts brass gold-plated.
Described plated film air chamber is got between 10～20mm.
Described infrared eye has two passages, and one is reference channel, and another is detection channels.
Described diaphragm one side leans against inlet plenum, and opposite side is fixed by the O-ring seal that is stuck in inlet plenum left end groove.
Described plated film air chamber groove clamps fixing with the right groove of inlet plenum and the left groove of discharge chamber by flexible O-ring seal simultaneously.
The left end internal diameter of described inlet plenum is identical with prefocus cup diameter, and prefocus cup one end is against O-ring seal, and one end is against light source driving circuit plate.
Compared with prior art, the invention has the advantages that: by the rational air chamber of research and design, not only make light intensity transmitting evenly, and eliminate the disturbing factor that may produce to system error; Air chamber structure is simple, compact, does not need too complicated air chamber structure, is easier to dismounting, cleans; By Technique of Weak Signal Detection and theory of errors analysis and data processing, and solve the compensation problem of the impact of the environmental factor such as temperature, atmospheric pressure on measurement of concetration, improved the measuring precision, sensitivity and stability.
Accompanying drawing is described
Fig. 1 is CO
2gas sensor configuration explosive view.
Fig. 2 is CO
2gas sensor discharge chamber side view.
Fig. 3 is CO
2gas sensor discharge chamber cut-open view.
Embodiment
Below in conjunction with accompanying drawing embodiment, invention is described in further detail.
As shown in Figures 1 to 3, mainly being formed by circuit board and air chamber structure of system.Circuit board is divided into light source driving circuit plate 9, detector circuit plate 10 and master control borad 12, is fixedly connected with air chamber by screw 11 respectively at left end, right-hand member and bottom.Air chamber structure comprises a plated film air chamber 6 cylindraceous and two ends inlet plenum 5 and discharge chamber 7, and infrared light supply 1 and infrared eye 8 have been installed respectively in air chamber two ends, has a diaphragm 4 before them, is filter element, is again seal element.Prefocus cup 2 is housed in inlet plenum 5, and one end is against O-ring seal 3, and one end is against light source driving circuit plate 9, and outer warp is identical with inlet plenum 5 left end internal diameters.In the left groove of inlet plenum 52 and the right groove 72 of discharge chamber, be respectively charged into O-ring seal 3 and fix diaphragm 4, plated film air chamber groove 61 simultaneously with the right groove 51 of inlet plenum and the left groove 71 of discharge chamber with coordinate to make three's center line on same straight line by O-ring seal 3.Before infrared eye 8, narrow band pass filter is installed, only allows the infrared light of specific wavelength to pass through.The pulse signal that is produced certain frequency by MCU is controlled infrared light supply 1.The parallel infrared light of what infrared light supply 1 sent have continuous spectrum, first carry out filtering through infrared window piece 4, a filtering part does not need the infrared light of wave band, parallel radiation is to the gas to be measured that is full of air chamber, infrared energy can be by gas absorption to be measured, carry out filtering through a diaphragm 4 equally again, then see through through the selectivity that is arranged on infrared eye 8 optical filter above, be irradiated on infrared eye 8.Infrared eye 8 will be converted to electric signal by the luminous energy after gas absorption.This feeble signal, after high-accuracy two-stage filtering and amplifying circuit amplifies, obtains stable voltage signal.This voltage signal by analog to digital conversion circuit after, sampled data is sent to MCU and processes, MCU control circuit is by the data analysis sampling and send to host computer by serial ports.
Described light source driving circuit plate 9, detector circuit plate 10, master control borad 12 are connected and fixed by screw 11 and air chamber respectively at left end, right-hand member and bottom.
Described light source 1, infrared eye 8, plated film air chamber 6 threes' center must be on same straight line, can guarantee that like this light source can be received by infrared eye 8 with directional light as much as possible, reduces because of the beam reflection impact bringing that decays.
Described light source 1 and infrared eye 8 are fixed on respectively on light source driving circuit plate 9 and detector circuit plate 10.
The left end internal diameter of described inlet plenum 5 is identical with prefocus cup 2 diameters, and prefocus cup 2 one end are against O-ring seal 3, and one end is against light source driving circuit plate 9, to such an extent as to can be in inlet plenum 5 internal vibrations.
Described infrared acquisition 8 devices have two passages, and one is reference edge, and one is end of probe, and carries narrow band pass filter.
Described plated film air chamber 6 requires inwall bright and clean, is difficult for adsorbed gas, conventionally adopts brass gold-plated.
Described plated film air chamber 6 internal diameters are got between 10～20mm and are advisable.
Described plated film air chamber 6 length can have influence on measuring accuracy and measurement range, generally get 80～120mm and are advisable.
Described diaphragm 4 one sides nestle up inlet plenum 5, and opposite side is fixed by the O-ring seal 3 that is stuck in the left groove 52 of inlet plenum, have played the effect that filters simultaneously and seal.
The plated film air chamber groove 61 at described plated film air chamber 6 two ends clamps fixing with the right groove 51 of inlet plenum and the left groove 71 of discharge chamber by flexible O-ring seal 3 simultaneously.
Described O-ring seal 3 internal diameters are less than the outer warp of diaphragm 4, and external diameter is greater than diaphragm 4 external diameters.
Described inlet plenum 5 and discharge chamber 7 are chosen for black pom material, have avoided other light beams to penetrate and have impacted.
Described diaphragm is calcium fluoride crystal diaphragm 4, has more smooth light transmission features in 0.95～9um.
Described O-ring seal 3 is for having flexible elastomeric material.
Claims (8)
1. one kind based on not light splitting infrared method (NDIR) CO
2gas sensor, mainly being formed by circuit board and air chamber structure of system, wherein circuit board comprises light source driving circuit plate (9), detector circuit plate (10) and master control borad (12), air chamber structure part comprises inlet plenum (5), plated film air chamber (6) and discharge chamber (7), it is characterized in that: described light source driving circuit plate (9), detector circuit plate (10) and master control borad (12) are fixedly connected with respectively at left end, right-hand member and bottom with air chamber by screw (11); Described light source (1) and infrared eye (8) are separately fixed at light source driving circuit plate (9) and detector circuit plate (10), and are placed on inlet plenum (5) and discharge chamber (7); Respectively there are two grooves and a diaphragm (4) in described inlet plenum (5) and discharge chamber (7) inside, and O-ring seal (3) is stuck in groove; Plated film air chamber (6) is joined and is incorporated in inlet plenum (5) and is fixedly connected with discharge chamber (7) by plated film air chamber groove (61) and O-ring seal (3); The light beam that described light source sends is by the parallel ejaculation of prefocus cup (2), and by diaphragm (4), directive infrared eye (8) is upper, and detector (8) is connected with detecting plate circuit board (10).
2. CO according to claim 1
2gas sensor, is characterized in that: described light source (1), infrared eye (8), plated film air chamber (6) three's center must be on same straight line.
3. CO according to claim 1
2gas sensor, is characterized in that: described plated film air chamber (6) adopts brass gold-plated.
4. CO according to claim 1
2gas sensor, is characterized in that: described plated film air chamber (6) is got between 10～20mm.
5. CO according to claim 1
2gas sensor, is characterized in that: described infrared eye (8) has two passages, and one is reference channel, and another is detection channels.
6. CO according to claim 1
2gas sensor, is characterized in that: described diaphragm (4) one sides lean against inlet plenum (1), and opposite side is fixed by the O-ring seal (3) that is stuck in inlet plenum left end groove (52).
7. CO according to claim 1
2gas sensor, is characterized in that: described plated film air chamber groove (61) clamps fixing with the right groove of inlet plenum (51) and the left groove of discharge chamber (71) by flexible O-ring seal (3) simultaneously.
8. CO according to claim 1
2gas sensor, it is characterized in that: the left end internal diameter of described inlet plenum (5) is identical with prefocus cup (2) diameter, and prefocus cup (2) one end is against O-ring seal (3), and one end is against light source driving circuit plate (9).
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| CN201410092699.9A CN103884671A (en) | 2014-03-12 | 2014-03-12 | Nondispersive infrared (NDIR) CO2 gas sensor |
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| CN201410092699.9A CN103884671A (en) | 2014-03-12 | 2014-03-12 | Nondispersive infrared (NDIR) CO2 gas sensor |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104089918A (en) * | 2014-07-03 | 2014-10-08 | 中国人民解放军后勤工程学院 | Oil gas online detection device based on non-dispersed infrared method |
| CN105277502A (en) * | 2014-07-19 | 2016-01-27 | 帕拉贡股份公司 | Gas-sensor arrangement for measuring target-gas concentration |
| CN105403530A (en) * | 2015-10-26 | 2016-03-16 | 长沙开元仪器股份有限公司 | Gas concentration detection apparatus and method thereof |
| CN106872390A (en) * | 2017-03-24 | 2017-06-20 | 江苏舒茨测控设备股份有限公司 | Collimation and optical path length adjust gas-detecting device |
| CN106979824A (en) * | 2017-05-10 | 2017-07-25 | 南京信息工程大学 | A kind of NDIR ethylene gas sensor and its measuring method |
| CN107843571A (en) * | 2017-10-19 | 2018-03-27 | 中国科学院上海硅酸盐研究所 | A kind of VOCs monitor control systems based on relaxor ferroelectric monocrystal infrared thermal release electric detector |
| CN109883979A (en) * | 2019-03-26 | 2019-06-14 | 翼捷安全设备（昆山）有限公司 | A kind of adjustable long light-path infrared gas sensor and detection method |
| CN110389107A (en) * | 2019-08-21 | 2019-10-29 | 国网重庆市电力公司电力科学研究院 | The on-line measuring device of carbon tetrafluoride in a kind of high-tension switch gear |
| CN110554002A (en) * | 2019-09-30 | 2019-12-10 | 大连艾科科技开发有限公司 | Hydrogen sulfide concentration detection module, hydrogen sulfide concentration telemeter and application |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104089918A (en) * | 2014-07-03 | 2014-10-08 | 中国人民解放军后勤工程学院 | Oil gas online detection device based on non-dispersed infrared method |
| CN105277502A (en) * | 2014-07-19 | 2016-01-27 | 帕拉贡股份公司 | Gas-sensor arrangement for measuring target-gas concentration |
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| CN105403530A (en) * | 2015-10-26 | 2016-03-16 | 长沙开元仪器股份有限公司 | Gas concentration detection apparatus and method thereof |
| CN106872390A (en) * | 2017-03-24 | 2017-06-20 | 江苏舒茨测控设备股份有限公司 | Collimation and optical path length adjust gas-detecting device |
| CN106979824A (en) * | 2017-05-10 | 2017-07-25 | 南京信息工程大学 | A kind of NDIR ethylene gas sensor and its measuring method |
| CN106979824B (en) * | 2017-05-10 | 2023-09-12 | 南京信息工程大学 | Non-spectroscopic infrared ethylene gas sensor and measuring method thereof |
| CN107843571A (en) * | 2017-10-19 | 2018-03-27 | 中国科学院上海硅酸盐研究所 | A kind of VOCs monitor control systems based on relaxor ferroelectric monocrystal infrared thermal release electric detector |
| CN109883979A (en) * | 2019-03-26 | 2019-06-14 | 翼捷安全设备（昆山）有限公司 | A kind of adjustable long light-path infrared gas sensor and detection method |
| CN110389107A (en) * | 2019-08-21 | 2019-10-29 | 国网重庆市电力公司电力科学研究院 | The on-line measuring device of carbon tetrafluoride in a kind of high-tension switch gear |
| CN110389107B (en) * | 2019-08-21 | 2022-09-06 | 国网重庆市电力公司电力科学研究院 | Online carbon tetrafluoride detection device in high-voltage switch equipment |
| CN110554002A (en) * | 2019-09-30 | 2019-12-10 | 大连艾科科技开发有限公司 | Hydrogen sulfide concentration detection module, hydrogen sulfide concentration telemeter and application |
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Application publication date: 20140625 |