CN102230886B - Spectrometer air chamber switching apparatus used in on-line spectrometric analysis of gas - Google Patents
Spectrometer air chamber switching apparatus used in on-line spectrometric analysis of gas Download PDFInfo
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- CN102230886B CN102230886B CN 201110091432 CN201110091432A CN102230886B CN 102230886 B CN102230886 B CN 102230886B CN 201110091432 CN201110091432 CN 201110091432 CN 201110091432 A CN201110091432 A CN 201110091432A CN 102230886 B CN102230886 B CN 102230886B
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- air chamber
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- 238000004458 analytical method Methods 0.000 title abstract description 18
- 238000001228 spectrum Methods 0.000 claims abstract description 32
- 238000005259 measurement Methods 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims description 54
- 238000010183 spectrum analysis Methods 0.000 claims description 13
- 230000003595 spectral effect Effects 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 3
- 230000005622 photoelectricity Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 7
- 230000003287 optical effect Effects 0.000 abstract description 5
- 238000004140 cleaning Methods 0.000 abstract 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 12
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
- 238000000862 absorption spectrum Methods 0.000 description 4
- NNPPMTNAJDCUHE-UHFFFAOYSA-N isobutane Chemical compound CC(C)C NNPPMTNAJDCUHE-UHFFFAOYSA-N 0.000 description 4
- 238000004868 gas analysis Methods 0.000 description 3
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 239000001282 iso-butane Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000001294 propane Substances 0.000 description 2
- 230000002000 scavenging effect Effects 0.000 description 2
- IJDNQMDRQITEOD-UHFFFAOYSA-N sec-butylidene Natural products CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 2
- 238000007405 data analysis Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012113 quantitative test Methods 0.000 description 1
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Abstract
The invention discloses an spectrometer air chamber switching apparatus used in an on-line spectrometric analysis of gas, which comprises a measuring air chamber, a sample air chamber, a linear bearing, a vertical movement mechanism and a spacing sensor; the measuring air chamber and the sample air chamber are fixedly arranged on the base of the air chamber, the base of the air chamber is fixedly connected with a connection installing plate by a fastening screw; the linear bearing comprises a guide rod and a bearing base, the guide rod is fixedly arranged on the floor, the bearing base is fixedly arranged on the connection installing plate. The measuring gas chamber is placed in an optical path when a normal measurement is performed, the switching apparatus places the corresponding standard sample gas chamber in the optical path under the control of a computer when the background needs to be scanned again. The switching apparatus places the measuring air chamber into the optical path again after the background spectrum is completed scanned, the spectrometer is recovered to a normal spectrum scanning and a spectrometric analysis. The method omits the time of cleaning the air chamber when the background is scanned, which substantially reduces the missed measurement data during the spectrum on-line analytical process, and avoids the system analysis error introduced by residual gas due to the unclean gas chamber.
Description
Technical field
The present invention relates to the spectrum on line analysis field of gas componant and concentration, particularly the spectrum on line analysis of the gas componant of monochromatic light road spectrometer and concentration.
Background technology
Spectrometer can be realized nearly all quantitative gas analysis, and does not consume any material in the spectrometer course of work, does not bring any pollution, is referred to as " green " instrument.Along with computer technology, the development of data analysis treatment technology, in recent years, spectrometer has begun to be applied to the on-line analysis field of gas componant and concentration.But because devices such as light source, detector in the process of working long hours certain characteristic variations can take place, cause in long-time on-line analysis process, certain drift can take place in spectrum, or even distortion.For reducing the influence that some device property of spectrometer drifts about and brings to analysis result, need suitably carry out background scans.
Spectrometer has two kinds of monochromatic light road spectrometer and double light paths.When carrying out the online gas componant of spectrometer and concentration analysis, the former needs scanning background spectrum, need before the scanning background with nitrogen or normal air air chamber to be cleaned, this needs a few minutes even longer time on the one hand, to such an extent as to caused the test leakage of gas componant and concentration information, on the other hand, clean totally inadequately if measure air chamber, then residual gas will be to subsequent analysis drawing-in system deviation as a result; The latter is owing to be that two-way is to be made of the duplicate light path of two-way in theory, and only one the tunnel is used for measuring, and the influence that factor such as environmental change is brought to analysis result can be eliminated as a reference in theory in another road, does not need scanning background.But the double light path spectrometer can not solve the influence that device property drifts about and brings to analysis result in the process that works online for a long time.At first, desirable duplicate light path is non-existent, and the drift characteristic of the components and parts on the two-way light path is also unlikely just the same.Therefore, after working online for a long time, the analysis result of double light path spectrometer also can be subjected to the influence that the drift of spectrometer part characteristic brings unavoidably, and this influence may be bigger.Secondly, the detector of spectrometer, spectroscopical price are about 20,000 Renminbi, and the price of double light path spectrometer is high more a lot of than monochromatic light road spectrometer, is unfavorable for applying of spectrometer.
As shown in Figure 1, provided on-the-spot infrared-gas absorption spectrum in the Fourier transform that obtains, 0.01% concentration methane, ethane, propane, isobutane, the normal butane spectrum, and 0.1% concentration carbon dioxide standard gas spectrum of scanning of petroleum prospecting among the figure.Under the normal condition, because the infrared-gas absorption spectrum is the ratio of actual absorption spectrum and background spectrum in the Fourier transform that obtains, therefore, it is 1 straight line that the baseline of the spectrum that obtains should be Y value, but significantly, inclination has taken place in the baseline of on-the-spot scanning optical spectrum significantly in the accompanying drawing 1.In addition, for being infrared-gas absorption spectrum in the Fourier transform of output with the transmissivity, the direction of absorption peak all should be down, rather than up.Wave number 3016.6 places are the absorption peak of methane, and on-the-spot scanning optical spectrum raises up at this place.This shows that the spectrometer air chamber cleans unclean, has residual gas such as methane when scanning background spectrum.The existence of methane residual gas during scanning background spectrum, the concentration of methane is less than normal in the feasible analysis result subsequently.
Summary of the invention
The objective of the invention is to, the device of air chamber scavenging period in a kind of online gas componant of effective saving spectrometer and the concentration analysis process is provided, improve the online real-time of gas analysis, reduce the test leakage data, unclean because measuring the air chamber flushing when avoiding scanning background spectrum, residual gas drawing-in system deviation.
To achieve these goals, the spectrum air chamber switching device shifter technical scheme that the present invention adopts is, in spectrometer, increase a material, structure, the duplicate air chamber of size, one of them air chamber is used for measuring, be referred to as to measure air chamber, another air chamber is used for depositing pure nitrogen gas or normal air, is referred to as sample gas air chamber.During normal the measurement, measure air chamber and place light path, in the time of need rescaning background, switching device shifter places light path by motor with sample gas air chamber under computer control.After having scanned background spectrum, switching device shifter places light path measuring air chamber again, makes spectrometer recover normal spectral scan and spectral analysis.
Spectrometer air chamber switching device shifter in the online spectral analysis of described gas comprises compositions such as measuring air chamber, sample gas air chamber, linear bearing, vertical movement mechanism, limit sensors; Described measurement air chamber and sample gas air chamber are fixedly mounted on the air chamber base, and the air chamber base is fixedlyed connected with holding screw with the connection plate; Described linear bearing is made of guide rod and bearing seat, and guide rod is fixedly mounted on the floor, and bearing seat is fixedly mounted on the connection plate; Described vertical movement mechanism is made up of motor, motor mount, screw rod, removable spiral shell, motor is installed on the motor mount, can carry out continuous rotating, motor mount is fixedly mounted on the base plate by holding screw, the output shaft fixed connection of screw rod and motor, removable nut is fixedly mounted on the connection plate, and air chamber base, 2 bearing seats, a nut are installed on the connection plate.When needs scanning background spectrum, the control motor is just changeing drive screw turns, and then driving and screw rod nut engaged move up, thereby driving connection plate, air chamber move up along the linear bearing center, till the upper limit sensor detects the signal that puts in place, be about to the standard air chamber and move in the light path, finish background spectrum scanning; After having scanned background spectrum, the counter-rotating of control motor drives the connection plate, air chamber moves down along the linear bearing center, till the lower limit sensor detects the signal that puts in place, namely the measurement air chamber is placed light path again, make spectrometer recover normal spectral scan and spectral analysis, thereby reach the purpose of spectral scan.
Standard sample gas in the described standard sample gas air chamber is pure nitrogen gas or normal air, and described measurement air chamber and standard sample gas air chamber material, size are just the same.Measuring air chamber has an air intake opening and a gas outlet, splits the air chamber two ends, links to each other with outlet pipe with admission line; Standard gas air chamber also has an air intake opening and a gas outlet, and under the normal condition, these two mouths are airtight, only opens air intake opening and gas outlet and change standard sample gas when needs more vary gas.
The vertical move mode that described air chamber switching mode adopts the screw rod rotating nut to move also can adopt the mode of moving horizontally, and perhaps turns round mode continuously.Move mode is not limited to adopt linear bearing, also can adopt linear slide rail or common rail; Driving mechanism is not limited to motor in conjunction with the mode of motion of nut-screw, mechanism such as can adopt also that cylinder is flexible, magnetoconstriction, piezoelectricity are flexible.
The control that described air chamber switches is realized that by limit sensors limit sensors can adopt the photoelectricity non-contact sensor, also can adopt mechanical stroke switch, perhaps microswitch.
Described motor can be for alternating current generator, stepper motor or servomotor a kind of, the motor output speed determines that by the switch speed of practical application motor must be able to be realized continuous rotating campaign.
The present invention has improved the online real-time of gas analysis for having saved the air chamber scavenging period in the online gas componant of Fourier transform spectrometer, and the concentration analysis process, reduces the test leakage data, is fit to be applied to the spectrum on line quantitative test of gaseous matter.
Description of drawings
Spectrum after Fig. 1 0.01% concentration methane, ethane, propane, isobutane, normal butane, 0.1% concentration carbon dioxide standard gas spectrum drift about with the back spectrometer device occurrence features that works long hours;
Fig. 2 is air chamber switching device shifter section of structure;
1 is base among the figure, and 2 is guide rod, and 3 is bearing seat, guide rod and bearing seat constitute linear bearing, and 4 is the lower limit sensor, and 5 is the upper limit sensor, 6 is standard sample gas air chamber, and 7 is air intake opening, and 8 for measuring air chamber, 9 is the air chamber mount pad, and 10 is the gas outlet, and 11 are the connection plate, 12 is removable nut, 13 is vertical movement mechanism, and 14 is motor, and 15 is holding screw.
Embodiment
The online gas componant of spectrometer and concentration analysis air chamber switching device shifter comprise compositions such as measuring air chamber, standard sample gas air chamber, linear bearing, vertical movement mechanism, limit sensors as shown in Figure 2; Guide rod and bearing seat constitute linear bearing, and guide rod is fixedly mounted on the floor, and bearing seat is fixedly mounted on the connection plate; Motor, motor mount, screw rod, removable nut constitute vertical movement mechanism, motor is installed on the motor mount, can carry out continuous rotating, motor mount is fixedly mounted on the base plate by holding screw, the output shaft of screw rod and motor connects firmly, and removable nut is fixedly mounted on the connection plate; Measure air chamber and sample gas air chamber and be fixedly mounted on the air chamber base, the air chamber base is fixedlyed connected by holding screw with the connection plate, and 2 bearing seats, a nut also are installed on the connection plate.Upper limit sensor, lower limit sensor are fixedly mounted on the base, and the spacing of sensor is adjusted according to required vertical moving displacement.When needs scanning background spectrum, the control motor is just changeing drive screw turns, and then driving and screw rod nut engaged move up, thereby driving connection plate, air chamber move up along the linear bearing center, till the upper limit sensor detects the signal that puts in place, be about to the standard air chamber and move in the light path, can carry out background spectrum scanning; After the intact background spectrum scanning, the counter-rotating of control motor drives the connection plate, air chamber moves down along the linear bearing center, till the lower limit sensor detects the signal that puts in place, namely the measurement air chamber is placed light path again, make spectrometer recover normal spectral scan and spectral analysis, thereby reach the purpose of spectral scan.
Above content is to further describing that the present invention does in conjunction with concrete preferred implementation; can not assert that the specific embodiment of the present invention only limits to this; for the general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; can also make some simple deduction or replace, all should be considered as belonging to the present invention and determine scope of patent protection by claims of submitting to.
Claims (7)
1. the spectrometer air chamber switching device shifter in the online spectral analysis of gas is characterized in that: comprise and measure air chamber, standard sample gas air chamber, linear bearing, vertical movement mechanism and limit sensors; Described measurement air chamber and standard sample gas air chamber are fixedly mounted on the air chamber mount pad, and the air chamber mount pad is fixedlyed connected with holding screw with the connection plate; Described linear bearing is made of guide rod and bearing seat, and guide rod is fixedly mounted on the base, and bearing seat is fixedly mounted on the connection plate; Described vertical movement mechanism is made up of motor, motor mount, screw rod and removable nut, motor is installed on the motor mount, motor mount is fixedly mounted on the base by holding screw, and the output shaft fixed connection of screw rod and motor, removable nut are fixedly mounted on the connection plate;
The control motor is just changeing drive screw turns, and standard sample gas air chamber is moved in the light path, finishes background spectrum scanning; After having scanned background spectrum, the counter-rotating of control motor places light path again measuring air chamber;
Guide rod and the relatively independent setting of removable nut.
2. the spectrometer air chamber switching device shifter in the online spectral analysis of a kind of gas according to claim 1, it is characterized in that: when needs scanning background spectrum, the control motor is just changeing drive screw turns, and then driving and screw rod nut engaged move up, thereby driving connection plate, air chamber move up along the linear bearing center, till the upper limit sensor detects the signal that puts in place, be about to standard sample gas air chamber and move in the light path, finish background spectrum scanning; After having scanned background spectrum, the counter-rotating of control motor drives the connection plate, air chamber moves down along the linear bearing center, till the lower limit sensor detects the signal that puts in place, namely the measurement air chamber is placed light path again, make spectrometer recover normal spectral scan and spectral analysis, thereby reach the purpose of spectral scan.
3. the spectrometer air chamber switching device shifter in the online spectral analysis of a kind of gas according to claim 1 is characterized in that: air chamber mount pad, 2 bearing seats and a removable nut are installed on the described connection plate.
4. the spectrometer air chamber switching device shifter in the online spectral analysis of a kind of gas according to claim 1 is characterized in that: described measurement air chamber and standard sample gas air chamber material, shape and size are just the same; An end of measuring air chamber is provided with an air intake opening, and the other end is provided with a gas outlet, and air intake opening links to each other with outlet pipe with admission line respectively with the gas outlet; One end of standard sample gas air chamber is provided with an air intake opening, and the other end is provided with a gas outlet.
5. the spectrometer air chamber switching device shifter in the online spectral analysis of a kind of gas according to claim 1, it is characterized in that: the control that described air chamber switches is realized that by limit sensors limit sensors adopts the photoelectricity non-contact sensor or adopts the mechanical stroke switch or adopt microswitch.
6. the spectrometer air chamber switching device shifter in the online spectral analysis of a kind of gas according to claim 1, it is characterized in that: described motor is a kind of of alternating current generator, stepper motor or servomotor, the motor output speed determines that by the switch speed of practical application motor must be able to be realized continuous rotating campaign.
7. the spectrometer air chamber switching device shifter in the online spectral analysis of a kind of gas according to claim 1, it is characterized in that: the standard sample gas in the described standard sample gas air chamber is pure nitrogen gas or normal air.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110091432 CN102230886B (en) | 2011-04-12 | 2011-04-12 | Spectrometer air chamber switching apparatus used in on-line spectrometric analysis of gas |
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| CN 201110091432 CN102230886B (en) | 2011-04-12 | 2011-04-12 | Spectrometer air chamber switching apparatus used in on-line spectrometric analysis of gas |
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| CN102230886B true CN102230886B (en) | 2013-08-14 |
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| CN103969209A (en) * | 2013-01-24 | 2014-08-06 | 上海朝辉压力仪器有限公司 | Concentration sensor |
| CN103900961B (en) * | 2014-03-17 | 2016-02-24 | 西安交通大学 | A kind of three air chamber switching apparatus of spectrometer and the online spectrum test method of gas |
| CN106441453B (en) * | 2016-11-23 | 2018-12-18 | 中国计量大学 | A kind of Fabry-Perot fiber optic grating Multifunction Sensor with miniflow cleaning |
| CN112578728B (en) * | 2020-12-15 | 2021-12-07 | 中国环境科学研究院 | Switching device and method for switching gas of ICP spectrometer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE3932838C2 (en) * | 1989-09-30 | 1996-03-07 | Hartmann & Braun Ag | Non-dispersive infrared gas analyzer |
| JP2520212B2 (en) * | 1992-09-07 | 1996-07-31 | 倉敷紡績株式会社 | Concentration measuring device |
| JP2002357548A (en) * | 2001-06-01 | 2002-12-13 | Shimadzu Corp | Non-dispersive infrared absorption detecting device |
| CN2630981Y (en) * | 2003-07-29 | 2004-08-04 | 王鼎 | Direct-push process driving mechanism for barcode analytic image electronic display screen |
| CN100494983C (en) * | 2005-08-12 | 2009-06-03 | 深圳迈瑞生物医疗电子股份有限公司 | Method and device for automatically correcting and measuring gas concentration using infrared light absorption characteristic |
| CN101713748A (en) * | 2008-10-07 | 2010-05-26 | 苏州德天自动化科技有限公司 | Axially spacing gearing |
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