CN101393121B - Methane gas concentration sensor air chamber based on infrared absorption principle - Google Patents
Methane gas concentration sensor air chamber based on infrared absorption principle Download PDFInfo
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- CN101393121B CN101393121B CN 200810137367 CN200810137367A CN101393121B CN 101393121 B CN101393121 B CN 101393121B CN 200810137367 CN200810137367 CN 200810137367 CN 200810137367 A CN200810137367 A CN 200810137367A CN 101393121 B CN101393121 B CN 101393121B
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- gas concentration
- concentration sensor
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Abstract
The invention relates to an air chamber for a methane gas concentration sensor on the basis of the infrared absorption principle, which relates to the air chamber for the methane gas concentration sensor and is provided for overcoming the defects of long response time, poor anti-interference ability and complex structure in a mechanical modulation-type infrared methane gas concentration sensor. The air chamber for the methane gas concentration sensor comprises a cylindrical shell, an infrared transmitter opening, a receiver opening, an axial-flow exhaust fan and probe protection tubes, wherein the infrared transmitter opening and the receiver opening are correspondingly arranged in the middle of the cylindrical shell by means of running through; central optical axes of the infrared transmitter opening and the receiver opening are positioned in the same axial line; the probe protection tubes are arranged on the infrared transmitter opening and the receiver opening respectively; central axial lines of the two probe protection tubes and the central optical axes of the infrared transmitter opening and the infrared receiver opening are positioned in the same axial line; a gap L is reserved between the two probe protection tubes; and the axial-flow exhaust fan is arranged on the upper inside of the cylindrical shell. The air chamber for the methane gas concentration sensor has the advantages of quick response speed, strong anti-interference ability, high stability and simple structure.
Description
Technical field
The present invention relates to a kind of air chamber of gas concentration sensor, be specifically related to a kind of air chamber of infrared-gas concentration sensor.
Background technology
Comparatively advanced both at home and abroad at present gas detection method is to adopt the infrared absorption principle detected gas.It has overcome in the past the detection method shortcomings such as wearing out, be subjected to such environmental effects of poisoning easily, simultaneously it also have highly sensitive, response speed fast, good selective.Therefore will have important practical significance and good prospects for application to ensureing industrial safety production, daily life safety to the research of adopting infrared principles detected gas method.And be that response speed is slow for the major defect of existing machinery modulation system sensing methane concentration device, poor anti jamming capability; Its response time, this was because in order to reduce power consumption, the gas flow in the air chamber can only be leaned on the diffusion of self generally greater than 30s.It is bigger that existing sensing methane concentration device is influenced by interference in air flow, because the fluctuation that interference in air flow produces may surpass the scope of sensor indicating value, and its air chamber light channel structure is also very complicated.Volume is especially big, not too is suitable for portable use.
Summary of the invention
The present invention is in order to solve response time length, poor anti jamming capability, the baroque shortcoming that existing machinery modulation system infrared methane gas concentration sensor exists, and the air chamber of a kind of methane gas concentration sensor based on infrared absorption principle of proposition.
Based on the air chamber of the methane gas concentration sensor of infrared absorption principle, it comprises cylindrical outer cover, infrared transmitter mouth, infrared remote receiver mouth, axial flow exhaust fan and two probe protection tubes; Two end faces up and down of cylindrical outer cover are respectively arranged with exhausr port and air intake opening; Infrared transmitter mouth and infrared remote receiver mouth position relatively are opened in the middle part of cylindrical outer cover, and the central optical axis of the central optical axis of infrared transmitter mouth and infrared remote receiver mouth is positioned on the same axis; The inside surface place of the inside surface place of infrared transmitter mouth and infrared remote receiver mouth is equiped with the identical probe protection tubes of bore of an internal diameter and the bore and the infrared remote receiver mouth of infrared transmitter mouth respectively in cylindrical outer cover, and the central optical axis of the central axis of described two probe protection tubes and infrared transmitter mouth and the central optical axis of infrared remote receiver mouth are positioned on the same axis; Leave gap L between described two probe protection tubes; Described two probe protection tubes are divided into inlet plenum and diffusion air chamber to the inner space of cylindrical outer cover; The exhaust ports of the inside of cylindrical outer cover is equiped with the axial flow exhaust fan.
The present invention has the advantage that the response time is short, low in energy consumption, antijamming capability is strong, accuracy is high.The present invention is after exhausr port 13 places are provided with axial flow exhaust fan 12, and response speed obviously improves, and the response time shortens to 5s～10s, and axial flow exhaust fan 12 power do not increase very high power consumption about 30W.π shape round platform formula radome fairing 5 and exhaust screen and hygroscopic agent layer 11 the interference that the effective fluctuation that has solved air-flow causes measurement is set, the indicating value fluctuation that interference in air flow is produced is reduced to about 0.05%, air inlet screen 3 and particle hygroscopic agent layer 4 filter out the impurity (comprising dust and steam etc.) in the air-flow to be measured, prevent the corrosion of impurity to infrared transmitter mouth 7 and infrared remote receiver mouth 8, the stability and the accuracy of detection system have been improved greatly, and meet the requirement of low-power consumption, and volume is less, be suitable for portable use, can be widely used in coal mining, fields such as exploitation of oil-gas field.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Embodiment
Embodiment one: in conjunction with Fig. 1 present embodiment is described, present embodiment comprises cylindrical outer cover 1, infrared transmitter mouth 7, infrared remote receiver mouth 8, axial flow exhaust fan 12 and two probe protection tubes 14; Two end faces up and down of cylindrical outer cover 1 are respectively arranged with exhausr port 13 and air intake opening 2; Infrared transmitter mouth 7 and infrared remote receiver mouth 8 positions relatively are opened in the middle part of cylindrical outer cover 1, and the central optical axis of the central optical axis of infrared transmitter mouth 7 and infrared remote receiver mouth 8 is positioned on the same axis; The inside surface place of the inside surface place of infrared transmitter mouth 7 and infrared remote receiver mouth 8 is equiped with the identical probe protection tubes 14 of bore of an internal diameter and the bore and the infrared remote receiver mouth 8 of infrared transmitter mouth 7 respectively in cylindrical outer cover 1, and the central optical axis of the central axis of described two probe protection tubes 14 and infrared transmitter mouth 7 and the central optical axis of infrared remote receiver mouth 8 are positioned on the same axis; Leave gap L between described two probe protection tubes 14; Described two probe protection tubes 14 are divided into inlet plenum 6 and diffusion air chamber 10 to the inner space of cylindrical outer cover 1; Internal vent ports 13 places of cylindrical outer cover 1 are equiped with axial flow exhaust fan 12.The effect that leaves gap L between described two probe protection tubes 14 is that the gas that will be evenly distributed in the inlet plenum 6 focuses on shaft core position, detecting device is detected concentrate and uniform gas.
Embodiment two: in conjunction with Fig. 1 present embodiment is described, present embodiment and embodiment one difference are that it has also increased two-layer air inlet screen 3; Two-layer air inlet screen 3 is installed on the air intake opening 2 of cylindrical outer cover 1.Other composition is identical with embodiment one with connected mode.The purpose of increase air inlet screen 3 is the impurity in the tested gas of elimination.
Embodiment three: in conjunction with Fig. 1 present embodiment is described, present embodiment and embodiment one difference are that it has also increased particle hygroscopic agent layer 4; Particle hygroscopic agent layer 4 is installed between the two-layer air inlet screen 3.Other composition is identical with embodiment one with connected mode.The purpose of increase particle hygroscopic agent layer 4 is to adsorb the steam in the tested gas of elimination.
Embodiment four: in conjunction with Fig. 1 present embodiment is described, present embodiment and embodiment one difference are that it has also increased π shape round platform formula radome fairing 5; π shape round platform formula radome fairing 5 is installed on the side of inner shoulder table 9 of cylindrical outer cover 1.Other composition is identical with embodiment one with connected mode.The purpose that increases π shape round platform formula radome fairing 5 is to guarantee that the gas behind the filtration drying is evenly distributed in the inlet plenum 6, so that detect uniform gas.
Embodiment five: in conjunction with Fig. 1 present embodiment is described, present embodiment and embodiment one difference are that it has also increased exhaust screen and hygroscopic agent layer 11; Exhaust screen and hygroscopic agent layer 11 are installed in the inside of cylindrical outer cover 1 and are positioned at the bottom of axial flow exhaust fan 12.Other composition is identical with embodiment one with connected mode.Increase the gas after exhaust screen and hygroscopic agent layer 11 not only can filter test, can also reduce axial flow exhaust fan 12 and rotate of the influence of the eddy current of formation air-flow in the diffusion air chamber 10.
The course of work of the present invention: the tested air communication that is mixed with methane gas is crossed air intake opening 2 earlier through air inlet screen 3 and particle hygroscopic agent layer 4 filtration elimination impurity and steam; and be uniformly distributed in inlet plenum 6 inside through π shape round platform formula radome fairing 5, under the effect of axial flow exhaust fan 12, enter infrared transmitter mouth 7 and infrared remote receiver mouth 8 that the both sides of shaft core position are isolated by probe protection tubes then.Gas by gap between two probe protection tubes 14 enters diffusion air chamber 10, is discharged air chamber through exhaust screen and hygroscopic agent layer 11 back by axial flow exhaust fan 12 again.In whole process, the dry gas stream after only needing the axial flow exhaust fan 12 of a low-power consumption can guarantee to filter flows through test port uniformly, and the interference that detecting device is subjected to drops to minimum.
Principle of work of the present invention: the gas concentration infrared detection is according to gas the character that the infrared radiation selectivity absorbs to be carried out.When certain material was subjected to the infrared beam irradiation, this matter selective ground absorbed the photon of some frequency, diminishes thereby show as the transmission light intensity.Utilize the absorption of material molecule, can obtain and the corresponding infrared absorption spectrum of molecular structure infrared radiation.
When a branch of light intensity is I
0Directional light when being filled with the air chamber of gas, if light source light spectrum covers one or more gaseous absorption lines, light beam is during by gas medium, because gas absorption part luminous energy, light intensity will weaken, according to the Lambert-Beer law, and output intensity I and input light intensity I
0, gas concentration C and gas absorption length L the pass be:
I＝I
0exp(-aCL)
In the formula, parameter a is the absorption coefficient of gas at the certain frequency place, and parameter L is for absorbing the length in path, and parameters C is a gas concentration.
If absorption coefficient can record, by detecting the variation of input light intensity and output intensity, add known light path, just can record the concentration value of gas.Realize jointly by the infraluminescence pipe and the detector of methane transducer air chamber both sides and detect the I/O intensity variations.
Claims (5)
1. based on the air chamber of the methane gas concentration sensor of infrared absorption principle, it is characterized in that it comprises cylindrical outer cover (1), infrared transmitter mouth (7), infrared remote receiver mouth (8), axial flow exhaust fan (12) and two probe protection tubes (14); Two end faces up and down of cylindrical outer cover (1) are respectively arranged with exhausr port (13) and air intake opening (2); Infrared transmitter mouth (7) and infrared remote receiver mouth (8) position relatively are opened in the middle part of cylindrical outer cover (1), and the central optical axis of the central optical axis of infrared transmitter mouth (7) and infrared remote receiver mouth (8) is positioned on the same axis; The inside surface place of the inside surface place of infrared transmitter mouth (7) and infrared remote receiver mouth (8) is equiped with the identical probe protection tubes (14) of bore of an internal diameter and the bore and the infrared remote receiver mouth (8) of infrared transmitter mouth (7) respectively in cylindrical outer cover (1), and the central optical axis of the central axis of described two probe protection tubes (14) and infrared transmitter mouth (7) and the central optical axis of infrared remote receiver mouth (8) are positioned on the same axis; Leave gap (L) between described two probe protection tubes (14); Described two probe protection tubes (14) are divided into inlet plenum (6) and diffusion air chamber (10) to the inner space of cylindrical outer cover (1); The exhausr port (13) of the inside of cylindrical outer cover (1) locates to be equiped with axial flow exhaust fan (12).
2. the air chamber of the methane gas concentration sensor based on infrared absorption principle according to claim 1 is characterized in that it also comprises two-layer air inlet screen (3); Two-layer air inlet screen (3) is installed on the air intake opening (2) of cylindrical outer cover (1).
3. the air chamber of the methane gas concentration sensor based on infrared absorption principle according to claim 2 is characterized in that it also comprises particle hygroscopic agent layer (4); Particle hygroscopic agent layer (4) is installed between the two-layer air inlet screen (3).
4. the air chamber of the methane gas concentration sensor based on infrared absorption principle according to claim 1 is characterized in that it also comprises π shape round platform formula radome fairing (5); π shape round platform formula radome fairing (5) is installed on the side of inner shoulder table (9) of cylindrical outer cover (1).
5. the air chamber of the methane gas concentration sensor based on infrared absorption principle according to claim 1 is characterized in that it also comprises exhaust screen and hygroscopic agent layer (11); Exhaust screen and hygroscopic agent layer (11) are installed in the inside of cylindrical outer cover (1) and are positioned at the bottom of axial flow exhaust fan (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810137367 CN101393121B (en) | 2008-10-22 | 2008-10-22 | Methane gas concentration sensor air chamber based on infrared absorption principle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810137367 CN101393121B (en) | 2008-10-22 | 2008-10-22 | Methane gas concentration sensor air chamber based on infrared absorption principle |
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| CN101393121A CN101393121A (en) | 2009-03-25 |
| CN101393121B true CN101393121B (en) | 2010-09-15 |
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| CN 200810137367 Expired - Fee Related CN101393121B (en) | 2008-10-22 | 2008-10-22 | Methane gas concentration sensor air chamber based on infrared absorption principle |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102313702B (en) * | 2010-07-03 | 2013-07-10 | 聚光科技(杭州)股份有限公司 | Photoelectric analysis method and device for gas in pipeline |
| CN102564949B (en) * | 2010-12-30 | 2014-03-12 | 神基科技股份有限公司 | Gas detecting system and gas detecting method |
| CN105046889B (en) * | 2015-08-07 | 2018-06-29 | 山西四建集团有限公司 | Construction site airborne dust real-time monitoring alarming linkage |
| CN105203491B (en) * | 2015-10-10 | 2018-08-31 | 山东省科学院海洋仪器仪表研究所 | A kind of deep-sea methane concentration situ detection system |
| CN106959355A (en) * | 2017-04-19 | 2017-07-18 | 杨和生 | active gas sensor |
| CN110967286A (en) * | 2019-12-30 | 2020-04-07 | 天津智易时代科技发展有限公司 | Oil smoke probe |
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Granted publication date: 20100915 Termination date: 20111022 |