CN102721659A - Air chamber structure for nondispersive spectrum gas analyser - Google Patents
Air chamber structure for nondispersive spectrum gas analyser Download PDFInfo
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- CN102721659A CN102721659A CN2012102320217A CN201210232021A CN102721659A CN 102721659 A CN102721659 A CN 102721659A CN 2012102320217 A CN2012102320217 A CN 2012102320217A CN 201210232021 A CN201210232021 A CN 201210232021A CN 102721659 A CN102721659 A CN 102721659A
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- air chamber
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Abstract
The invention belongs to the technical field of photoelectricity and micro electro mechanical systems, and relates to an air chamber structure, in particular to an air chamber structure of a nondispersive spectrum gas analyser. The air chamber structure comprises an air chamber inner shell, a filter core, an air chamber outer shell, a front cover, a rear cover, a transmitting end and a receiving end; the air chamber inner shell and the air chamber outer shell are of ring body structures, small holes are uniformly distributed on a circumference surface of the air chamber inner shell, and an inner diameter of the air chamber outer shell is larger than an outer diameter of the air chamber inner shell; through holes are opened on the front cover and the rear cover; and according to the novel straight air chamber structure provided by the invention, the affect on a calculating result of air concentration caused by pollution from extremely small number of dusts is greatly reduced, parallel light coincides with the empirical equation stated in the Beer-Lambert law, and the difficulty on norm algorithm of air concentration is reduced.
Description
Technical field
The invention belongs to photoelectricity and micro-electromechanical system field, relate to a kind of air chamber structure, particularly a kind of air chamber structure that is used for on-dispersive type spectrum gas analyzer.
Background technology
Detection for common toxic gas; Particularly inorganic poison gas; The general gas analyzer of special use that adopts detects, and is called the spectroscopic methodology gas analyzer here based on the gas analyzer of Spectrum Absorption Principle, a kind of exactly gas analyzer with large development future.With the spectroscopic methodology is that basic toxic and harmful analyser gas analyzer mainly is used in the high precision survey that industries such as industry, agricultural, medical treatment, intelligent building, analytical instrument are used for gas concentration at present, as is used in fields such as pollutant monitoring, vehicle exhaust analysis, gas and combustible gas detection, gas composition analysis, medical monitoring equipment, air quality analyses, ultimate analysis instrument.
Principle of work based on the on-dispersive type gas analyzer of Spectrum Absorption Principle can be described below:
Toxic and harmful is followed Beer-Lambert law to being absorbed in of its characteristic spectral coverage spectral energy in the low strength range:
P=P
0Exp(-kcl)
P wherein
0Be the energy that light source produced, P be energy that light source produced through the environment that has toxic and harmful after remaining energy, k is the spectral absorptance of toxic and harmful, l is the distance of light source apart from spectral detector, c is the concentration of toxic and harmful.According to Beer-Lambert law, in reality, just can detect the concentration of toxic and harmful.
On-dispersive type gas analyzer based on Spectrum Absorption Principle generally is made up of five parts such as air chamber, shell, master control borad, audible-visual annunciator and telepilots on hardware; Air chamber then plays responsible energy emission, transmission, reception; And gas concentration signal to be measured is converted into accessible action of electric signals; Be the core component of complete machine, its performance quality will directly influence machine performance.In order to obtain bigger absorbing amount; The gas of explaining according to Lambert-Beer's law depends on light path and this ultimate principle of gas concentration to the degree of absorption of light; Prior art prolongs light path through in short space, making the grooved optical channel with high reflectance; It is ellipsoid shape air chamber structure
Its shortcoming be following some:
1, complex process, cost height:
Technology is made comparatively complicated, needs high-precision grinding, polishing and coating spectral wavelength to be had the coating process process of the metal inner surfaces such as precious metal-platinum, gold of high reflectance, causes cost to rise.
2, measuring accuracy is affected by environment easily:
In some application circumstances; After instrument works long hours technically first because of reflecting surface by the dust pollution of micron order yardstick after; Reflectivity sharply descends, and the gas concentration calculating empirical equation of gas analyzer is changed, and causes measurement of concetration inaccurate; The empirical equation of second explaining because of Lambert-Beer's law is the directional light that sends to light source; And after repeatedly the side is penetrated, will depart from Lambert-Beer's law; Particularly it departs from situation and just seems even more serious when gas concentration is higher, so will make troubles to the quantitative algorithm of gas concentration through in short space, making the air chamber design proposal that the grooved optical channel with high reflectance prolongs light path.
3, the contradictory problems of dust and moisture and response time is difficult to solve:
Dust and moisture and sensor response speed are a pair of contradiction, and especially for the mining on-dispersive type gas analyzer under the coal mine, as not solving the dust and moisture problem, its advantage will be replaced by the inferior position that the colliery subsurface environment is caused.Existing dust and moisture technical measures are to put the dust and moisture hydrophobicity filtration membrane on the small ventilative window of circuit board before covering air inlet of air chamber place and spectral detector,
Summary of the invention
Exist in the existing on-dispersive type gas analyzer technology of preparing in order to solve based on Spectrum Absorption Principle; Because the technical matters that adopt the caused complex process of ellipsoid shape air chamber structure, cost is high, measurement precision of gas analyzer is affected by environment easily, dust and moisture and the contradictory problems of response time are difficult to solve etc.; The present invention proposes a kind of air chamber structure that is used for on-dispersive type spectrum gas analyzer; In the hope of based in the design of the on-dispersive type gas analyzer of Spectrum Absorption Principle and making, and then be applied in the on-line monitoring field of toxic and harmful.
To achieve these goals, technical scheme of the present invention is a kind of air chamber structure that is used for on-dispersive type spectrum gas analyzer of design, comprises the air chamber inner casing, crosses filter core, air chamber shell, protecgulum, bonnet, transmitting terminal and receiving end; The gentle chamber enclosure of said air chamber inner casing is the torus structure, on the periphery of said air chamber inner casing, is uniformly distributed with and has aperture, and the internal diameter of said air chamber shell is greater than the external diameter of air chamber inner casing; On protecgulum and bonnet, have through hole;
Said transmitting terminal is made up of broad spectrum light source, transmitting terminal housing and light source driving circuit plate, and the inwall of said transmitting terminal housing is a conical structure;
Said receiving end is made up of receiving end housing, spectral detector and spectral detector pre-amplification circuit plate, and receiving end housing middle part is provided with draw-in groove;
Its annexation is: said broad spectrum light source is fixedly mounted on the light source driving circuit plate, and the light source driving circuit slab integral that has a broad spectrum light source is packed in the transmitting terminal housing and made broad spectrum light source place transmitting terminal inner walls slot place; Said spectral detector is fixedly mounted on the spectral detector pre-amplification circuit plate, pack into receiving end housing and make spectral detector pre-amplification circuit plate bottom be stuck in the draw-in groove place of the spectral detector pre-amplification circuit slab integral that has a spectral detector; The said filter core of crossing is wrapped in air chamber inner casing outside surface; The air chamber inner casing that was enclosed with filter core is installed in the air chamber shell and makes between the gentle chamber enclosure of air chamber inner casing leave the gap as gas delivery passage; The protecgulum left end all is fixedly connected with the two ends of bonnet right-hand member with the gentle indoor shell of air chamber shell; Gas delivery passage between the gentle indoor shell of the through hole of protecgulum and bonnet and air chamber shell connects; The protecgulum right-hand member links to each other with transmitting terminal inner walls wide mouth end, and bonnet end face left end links to each other with receiving end shell nozzle end.
The said filter core of crossing is crossed filter core for the folding hydrophobic type of annulus cylindricality.
Said protecgulum is to be connected through bolt or screw with the gentle indoor shell of air chamber shell.
Said bonnet is to be connected through bolt or screw with the gentle indoor shell of air chamber shell.
Its workflow is: the spectrum power supply by transmitting terminal transmits its energy to light source driving circuit, produces output current at light source driving circuit, along the cavity radiation of air chamber inner housing to the photosensitive unit of the spectral detector of receiving end; The voltage output of spectral detector receives the influence of gas absorption in the air chamber and changes, and gas concentration is high more, and absorbed light is high more; Output voltage on the spectral detector is low more; Gas concentration is low more, and the light of absorption is few more, and the voltage of spectral detector output is high more.The voltage of spectral detector output gets into one-chip computer or DSP digital signal processor and calculates after prime amplifier, differential amplifier amplify, and goes out concentration according to mathematical model with relevant calculation of parameter.
Advantage of the present invention and beneficial effect are:
One, taked the simplest straight air chamber structure on a kind of new air chamber structure involved in the present invention; Do not need high-precision grinding, polishing and spectral wavelength had the coating process process of the metal inner surface such as precious metal-platinum, gold of high reflectance, have the advantages that production technology is simple, cost is low.
Two, a kind of new air chamber structure involved in the present invention has been taked double-decker on straight air chamber structure; Being arranged in the air chamber the folding hydrophobic type of annulus cylindricality between the pipe and outer tube crosses filter core and has the characteristics bigger than the specific surface area of prior art filtering membrane; When greatly having improved responding ability, greatly prolonged the stream time of system.
Three, a kind of new straight air chamber structure involved in the present invention; Not only reduced the influence that is brought behind the only a few dust pollution significantly to the result of calculation of gas concentration; And the directional light empirical equation that Lambert-Beer's law explains that coincide, reduced the difficulty of the quantitative algorithm of gas concentration.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Wherein, 1-air chamber shell; 2-air chamber inner casing; The 3-transmitting terminal; The 4-receiving end; 5-crosses filter core; The 6-protecgulum; The 7-bonnet.
Embodiment
Further describe below in conjunction with accompanying drawing and embodiment specific embodiments of the invention, following examples only are used for technical scheme of the present invention more clearly is described, and can not limit protection scope of the present invention with this.
As shown in Figure 1, the technical scheme of practical implementation of the present invention is: a kind of air chamber structure that is used for on-dispersive type spectrum gas analyzer comprises air chamber inner casing 2, crosses filter core 5, air chamber shell 1, protecgulum 6, bonnet 7, transmitting terminal 3 and receiving end 4; Said air chamber inner casing 2 gentle chamber enclosures 1 are the torus structure, on the periphery of said air chamber inner casing 2, are uniformly distributed with and have aperture, and the internal diameter of said air chamber shell 1 is greater than the external diameter of air chamber inner casing 2; On protecgulum 6 and bonnet 7, have through hole;
Said transmitting terminal 3 is made up of broad spectrum light source, transmitting terminal housing and light source driving circuit plate, and the inwall of said transmitting terminal housing is a conical structure;
Said receiving end 4 is made up of receiving end housing, spectral detector and spectral detector pre-amplification circuit plate, and receiving end housing middle part is provided with draw-in groove;
Its annexation is: said broad spectrum light source is fixedly mounted on the light source driving circuit plate, and the light source driving circuit slab integral that has a broad spectrum light source is packed in the transmitting terminal housing and made broad spectrum light source place transmitting terminal inner walls slot place; Said spectral detector is fixedly mounted on the spectral detector pre-amplification circuit plate, pack into receiving end housing and make spectral detector pre-amplification circuit plate bottom be stuck in the draw-in groove place of the spectral detector pre-amplification circuit slab integral that has a spectral detector; The said filter core 5 of crossing is wrapped in air chamber inner casing 2 outside surfaces; The air chamber inner casing 2 that was enclosed with filter core 5 is installed in the air chamber shell 1 and makes between the air chamber inner casing 2 gentle chamber enclosures 1 leave the gap as gas delivery passage; Protecgulum 6 left ends all are fixedly connected with the two ends of bonnet 7 right-hand members with air chamber shell 1 gentle indoor shell 2; Gas delivery passage between the through hole of protecgulum 6 and bonnet 7 and the air chamber shell 1 gentle indoor shell 2 connects; Protecgulum 6 right-hand members link to each other with transmitting terminal inner walls wide mouth end, and bonnet 7 end face left ends link to each other with receiving end shell nozzle end.
The said filter core 5 of crossing is crossed filter core for the folding hydrophobic type of annulus cylindricality.
Said protecgulum 6 is to be connected through bolt or screw with air chamber shell 1 gentle indoor shell 2.
Said bonnet 7 is to be connected through bolt or screw with air chamber shell 1 gentle indoor shell 2.
The above only is a preferential embodiment of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from know-why of the present invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (4)
1. an air chamber structure that is used for on-dispersive type spectrum gas analyzer is characterized in that: comprise air chamber inner casing (2), cross filter core (5), air chamber shell (1), protecgulum (6), bonnet (7), transmitting terminal (3) and receiving end (4); The gentle chamber enclosure of said air chamber inner casing (2) (1) is the torus structure, on the periphery of said air chamber inner casing (2), is uniformly distributed with and has aperture, and the internal diameter of said air chamber shell (1) is greater than the external diameter of air chamber inner casing (2); On protecgulum (6) and bonnet (7), have through hole;
Said transmitting terminal (3) is made up of broad spectrum light source, transmitting terminal housing and light source driving circuit plate, and the inwall of said transmitting terminal housing is a conical structure;
Said receiving end (4) is made up of receiving end housing, spectral detector and spectral detector pre-amplification circuit plate, and receiving end housing middle part is provided with draw-in groove;
Its annexation is: said broad spectrum light source is fixedly mounted on the light source driving circuit plate, and the light source driving circuit slab integral that has a broad spectrum light source is packed in the transmitting terminal housing and made broad spectrum light source place transmitting terminal inner walls slot place; Said spectral detector is fixedly mounted on the spectral detector pre-amplification circuit plate, pack into receiving end housing and make spectral detector pre-amplification circuit plate bottom be stuck in the draw-in groove place of the spectral detector pre-amplification circuit slab integral that has a spectral detector; The said filter core (5) of crossing is wrapped in air chamber inner casing (2) outside surface; The air chamber inner casing (2) that will be enclosed with filter core (5) is installed in the air chamber shell (1) and makes between the gentle chamber enclosure of air chamber inner casing (2) (1) and leaves the gap as gas delivery passage; Protecgulum (6) left end all is fixedly connected with the two ends of the gentle indoor shell of air chamber shell (1) (2) with bonnet (7) right-hand member; Gas delivery passage between the through hole of protecgulum (6) and bonnet (7) and the gentle indoor shell of air chamber shell (1) (2) connects; Protecgulum (6) right-hand member links to each other with transmitting terminal inner walls wide mouth end, and bonnet (7) end face left end links to each other with receiving end shell nozzle end.
2. a kind of air chamber structure that is used for on-dispersive type spectrum gas analyzer according to claim 1 is characterized in that: the said filter core (5) of crossing is crossed filter core for the folding hydrophobic type of annulus cylindricality.
3. a kind of air chamber structure that is used for on-dispersive type spectrum gas analyzer according to claim 1 and 2 is characterized in that: said protecgulum (6) is to be connected through bolt or screw with the gentle indoor shell of air chamber shell (1) (2).
4. a kind of air chamber structure that is used for on-dispersive type spectrum gas analyzer according to claim 1 and 2 is characterized in that: said bonnet (7) is to be connected through bolt or screw with the gentle indoor shell of air chamber shell (1) (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102320217A CN102721659A (en) | 2012-07-05 | 2012-07-05 | Air chamber structure for nondispersive spectrum gas analyser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102320217A CN102721659A (en) | 2012-07-05 | 2012-07-05 | Air chamber structure for nondispersive spectrum gas analyser |
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|---|---|
| CN102721659A true CN102721659A (en) | 2012-10-10 |
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| CN2012102320217A Pending CN102721659A (en) | 2012-07-05 | 2012-07-05 | Air chamber structure for nondispersive spectrum gas analyser |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106596406A (en) * | 2016-12-26 | 2017-04-26 | 昆明斯派特光谱科技有限责任公司 | Gas chamber structure of non-dispersion type spectrum gas analyzer |
| CN108931504A (en) * | 2018-05-30 | 2018-12-04 | 山东省科学院激光研究所 | A kind of annular multiple spot reflection type photoelectricity gas sensor probe |
| CN109308791A (en) * | 2018-11-23 | 2019-02-05 | 成都工业学院 | The smoked device control method of one kind and the smoked device of intelligence |
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| US5528039A (en) * | 1995-03-01 | 1996-06-18 | O.I. Corporation | Method and apparatus for linearization of non-dispersive infrared detector response |
| JP2005010007A (en) * | 2003-06-19 | 2005-01-13 | Shimadzu Corp | Infrared gas analyzer |
| CN201022997Y (en) * | 2007-04-02 | 2008-02-20 | 上海集亚过滤器材有限公司 | Folding barrel type filter element |
| KR20080093767A (en) * | 2007-04-18 | 2008-10-22 | 주식회사 가스트론 | Diffusion-type gas sensor module using infrared rays |
| CN101363796A (en) * | 2007-12-29 | 2009-02-11 | 北京航空航天大学 | Carbon dioxide analyzer and analytical method thereof |
| CN202649108U (en) * | 2012-07-05 | 2013-01-02 | 昆明斯派特光谱科技有限责任公司 | Air chamber structure used for non-dispersion type light spectrum gas analyzer |
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2012
- 2012-07-05 CN CN2012102320217A patent/CN102721659A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5528039A (en) * | 1995-03-01 | 1996-06-18 | O.I. Corporation | Method and apparatus for linearization of non-dispersive infrared detector response |
| JP2005010007A (en) * | 2003-06-19 | 2005-01-13 | Shimadzu Corp | Infrared gas analyzer |
| CN201022997Y (en) * | 2007-04-02 | 2008-02-20 | 上海集亚过滤器材有限公司 | Folding barrel type filter element |
| KR20080093767A (en) * | 2007-04-18 | 2008-10-22 | 주식회사 가스트론 | Diffusion-type gas sensor module using infrared rays |
| CN101363796A (en) * | 2007-12-29 | 2009-02-11 | 北京航空航天大学 | Carbon dioxide analyzer and analytical method thereof |
| CN202649108U (en) * | 2012-07-05 | 2013-01-02 | 昆明斯派特光谱科技有限责任公司 | Air chamber structure used for non-dispersion type light spectrum gas analyzer |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106596406A (en) * | 2016-12-26 | 2017-04-26 | 昆明斯派特光谱科技有限责任公司 | Gas chamber structure of non-dispersion type spectrum gas analyzer |
| CN108931504A (en) * | 2018-05-30 | 2018-12-04 | 山东省科学院激光研究所 | A kind of annular multiple spot reflection type photoelectricity gas sensor probe |
| CN109308791A (en) * | 2018-11-23 | 2019-02-05 | 成都工业学院 | The smoked device control method of one kind and the smoked device of intelligence |
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Application publication date: 20121010 |