CN106018315B - A kind of engine exhaust gas analyzer based on Rowland grating - Google Patents
A kind of engine exhaust gas analyzer based on Rowland grating Download PDFInfo
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- CN106018315B CN106018315B CN201610325751.XA CN201610325751A CN106018315B CN 106018315 B CN106018315 B CN 106018315B CN 201610325751 A CN201610325751 A CN 201610325751A CN 106018315 B CN106018315 B CN 106018315B
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- 230000003595 spectral effect Effects 0.000 claims abstract description 21
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 238000010521 absorption reaction Methods 0.000 claims abstract description 16
- 239000004615 ingredient Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 6
- 239000011195 cermet Substances 0.000 claims description 4
- 239000006185 dispersion Substances 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 4
- 238000007711 solidification Methods 0.000 abstract description 2
- 230000008023 solidification Effects 0.000 abstract description 2
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 55
- 239000004215 Carbon black (E152) Substances 0.000 description 5
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000000862 absorption spectrum Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 238000002329 infrared spectrum Methods 0.000 description 3
- 238000002835 absorbance Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000001845 vibrational spectrum Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a kind of engine exhaust gas analyzer based on Rowland grating, the present invention relates to spectrometric instrument technical fields.Carry out the detection of discharge gas in the present invention to the characteristic absorption spectral peak of mid-infrared light according to discharge gas.In the engine exhaust gas analyzer, the characteristics of Rowland grating can be divided but also be imaged is utilized, it is simple in structure, compact；Compared to there are the Fourier Transform Infrared Spectrometer of moving element, there is the advantage of solidification design, improve the stability of detection.The present invention only carries out Multi-point detection to several characteristic absorption spectral peaks of discharge gas, compared to the detecting instrument using array type detector, significantly reduces cost.The fast and accurately detection to engine exhaust gas may be implemented in the engine exhaust gas analyzer that the present invention designs.
Description
Technical field
The present invention relates to spectrometric instrument technical field more particularly to a kind of engine emission gas based on Rowland grating
Body analyzer.
Background technology
Engine exhaust emission analyzer is detected, analyzes to the tail gas of discharge in normal working of engine, from
And judge a kind of instrument that whether automobile engine is working properly, whether discharge pernicious gas is exceeded, it is that control exhaust emissions is dirty
The effective tool of dye.The tail gas of Engine Exhaust Emission mainly has CO, CO2、NO、N2O、NH3And hydrocarbon etc., it is common
Engine exhaust emission analyzer have non-dispersive infrared absorption process, electrochemical process, hydrogen flameionization method, chemoluminescence method
Deng, and the prior art that there is resolution ratio is low, detection speed is slow, it is expensive, detect while can not achieve multiple gases
The shortcomings of.
Invention content
The present invention provides a kind of engine exhaust gas analyzer based on Rowland grating, the present invention pass through to discharging gas
Body carries out Multi-point detection in several characteristic absorption spectral peaks of middle infrared band, realizes and is examined to the ingredient and its content of discharge gas
It surveys；The characteristics of present invention can be divided but also be imaged using Rowland grating has simple, compact structure, meanwhile, using solidification
Design has higher stability, described below：
A kind of engine exhaust gas analyzer based on Rowland grating, including：Light source, parabolic mirror, gas cell,
Parabolic mirror, cylindrical barn door, entrance slit, Rowland grating, exit slit and detector,
The light source, first parabolic mirror, the gas cell, second parabolic mirror composition sampling
Module；The cylinder barn door, the entrance slit, the Rowland grating, the exit slit and detector composition
It is divided detection module；
The light source is used to generate cover in infrared band transmitting light beam, first parabolic mirror is by the light
The beam collimation that source is sent out, and it is made to impinge perpendicularly at the gas cell；Engine emission to be measured is placed in the gas cell
Gaseous sample；
Wherein, the cylindrical used in sunshade board is provided with the entrance slit and the exit slit thereon in shading, described
Rowland grating is placed on the inside of the cylindrical barn door；
Infrared transmission light beam during second parabolic mirror is collected, and converge to entering on the cylindrical barn door
It penetrates at slit；The Rowland grating is divided the mid-infrared light beam dispersion that enters by the entrance slit, and by different wave length
Mid-infrared light beam converge to the different location on the cylindrical barn door；
The mid-infrared light beam of different-waveband to be measured is emitted by the exit slit, and the width of the exit slit is according to waiting for
The waveband width for surveying mid-infrared light beam is configured；The detector is infrared in being emitted by the exit slit for detection
The intensity of light beam.
Wherein, the exit slit is one-to-one relationship with the detector, can be inhaled according to the feature of discharge gas
The quantity for receiving spectral peak is increased and decreased.
Wherein, the light source uses cermet light source.
The advantageous effect of technical solution provided by the invention is：The present invention inhales the feature of mid-infrared light according to discharge gas
Receive ingredient and its content detection that spectral peak carries out discharge gas；Pass through the use of Rowland grating so that structure is simpler, tight
It gathers；It is designed by curing, there is higher stability；By way of Multi-point detection, cost is significantly reduced.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of the engine exhaust gas analyzer based on Rowland grating proposed by the present invention；
Fig. 2 is the concrete structure schematic diagram for being divided detection module.
In attached drawing, parts list represented by the reference numerals are as follows：
1：Light source； 2：First parabolic mirror；
3：Gas cell； 4：Second parabolic mirror；
5：Cylindrical barn door； 6：Entrance slit；
7：Rowland grating； 8：Exit slit；
9：Detector.
Wherein, sampling module is by light source 1, the first parabolic mirror 2, gas cell 3,4 groups of the second parabolic mirror
At.Two parabolic mirrors difference lies in：First parabolic mirror 2 is the beam collimation for sending out light source 1, is formed flat
Row light；Second parabolic mirror 4 is the mid-infrared light beam assembled through gas cell 3.Light splitting detection module is hidden by cylinder
Tabula rasa 5, entrance slit 6, Rowland grating 7, exit slit 8 and detector 9 form.Wherein, exit slit 8 and detector 9 are one
One-to-one correspondence, quantity is consistent, can be increased and decreased according to the quantity of the characteristic absorption spectral peak of discharge gas.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, embodiment of the present invention is made below further
It is described in detail on ground.
Middle infrared spectrum is absorption spectrum of the molecule to mid-infrared light.The wave-length coverage of middle infrared band is 2.5 μm~25 μ
M, since fundamental vibration is to absorb strongest vibration, so being mainly shown as the fundamental vibration spectrum of molecule.Different molecules by
Have different mid infrared absorption spectrums, wavelength, intensity and quantity of characteristic absorption spectral peak etc. equal in the specificity of structure
It differs.Therefore, according to its spectrum, so that it may to determine that the substance whether there is；According to its absorption peak strength, according to lambert-ratio
That law, can measure its content, to realize the qualitative and quantitative analysis of substance.
Rowland grating is a series of reflective diffraction gratings of indentations of quarterization on spherical surface, also known as concave grating, it is both
Dispersion beam splitter is collective optics again, has the function of the diffraction of common plane grating, and the convergence with concave mirror
Imaging function, therefore collimation lens and imaging len are eliminated, to simplify structure.If by the incidence of source emissioning light beam
Slit is placed on Rowland grating on the same circle, this diameter of a circle is equal with the radius of curvature of spherical surface where grating, generally
The circle is called Rowland circle.In Rowland circle structure, entrance slit with its through grating imaging on Rowland circle.Rowland light
The use of grid can reduce the attenuation by absorption situation of light, only exist the light loss of primary event, therefore Rowland grating is in spectrum point
The fields such as analysis, optic communication have a wide range of applications.
Embodiment 1
Referring to Fig. 1 and Fig. 2, a kind of engine exhaust gas analyzer based on Rowland grating, including：Light source 1, paraboloid
Speculum 2, parabolic mirror 4, cylindrical barn door 5, entrance slit 6, Rowland grating 7, exit slit 8, is visited gas cell 3
Survey device 9.
Wherein, light source 1, the first parabolic mirror 2, gas cell 3, the second parabolic mirror 4 form sampling module.Circle
Cylindricality barn door 5, entrance slit 6, Rowland grating 7, exit slit 8 and the composition light splitting detection module of detector 9.
Two parabolic mirrors difference lies in：The light beam that first parabolic mirror 2 is used to send out light source 1 is accurate
Directly, directional light is formed；Second parabolic mirror 4 is used to assemble the mid-infrared light beam through gas cell 3.
Light source 1 is used to generate the transmitting light beam of infrared band in covering, what the first parabolic mirror 2 sent out light source 1
Beam collimation, and it is made to impinge perpendicularly at gas cell 3；Engine exhaust gas sample to be measured is placed in gas cell 3.
Wherein, cylindrical barn door 5 is used for shading, is provided with entrance slit 6 and exit slit 8 thereon, and Rowland grating 7 is placed
In the inside of cylindrical barn door 5.
Infrared transmission light beam during second parabolic mirror 4 is collected, and converge to the entrance slit on cylindrical barn door 5
At 6.Rowland grating 7 is divided the mid-infrared light beam dispersion that enters by entrance slit 6, and by the mid-infrared light beam of different wave length
Converge to the different location on cylindrical barn door 5.
The mid-infrared light beam of different-waveband to be measured is emitted by exit slit 8, and the width of exit slit 8 is according to red in be measured
The waveband width of outer light beam is configured.Detector 9 is used to detect the intensity for the mid-infrared light beam being emitted by exit slit 8.
Wherein, exit slit 8 is one-to-one relationship with detector 9, and quantity is consistent, can be according to the spy of discharge gas
The quantity that sign absorbs spectral peak is increased and decreased.
In conclusion the present invention carries out the characteristic absorption spectral peak of mid-infrared light according to discharge gas the ingredient of discharge gas
And its content detection；Pass through the use of Rowland grating so that structure is simpler, compact；It is designed, is had higher by curing
Stability；By way of Multi-point detection, cost is significantly reduced.
Embodiment 2
The scheme in embodiment 1 is described in detail with reference to Fig. 1, Fig. 2, it is described below：
A kind of engine exhaust gas analyzer based on Rowland grating, design structure include：Light source 1, the first parabolic
Face speculum 2, gas cell 3, the second parabolic mirror 4, cylindrical barn door 5, entrance slit 6, Rowland grating 7, outgoing are narrow
Seam 8 and detector 9.The ingredient to gas in tail gas can be realized according to the characteristic absorption spectral peak under test gas middle infrared spectrum
The detection of composition and content.
Wherein, light source 1 can use cermet light source, and mid-infrared light beam is generated by heating；It is incident on the first parabolic
Face speculum 2 forms collimated light beam after speculum collimates；After directional light enters gas cell 3, mid-infrared light is by sample gas spy
It absorbs to sign property, outgoing beam is converged to by the second parabolic mirror 4 at the entrance slit 6 on cylindrical barn door 5, is entered
Irradiating light beam, by the difference of wavelength, leads to after the light splitting of Rowland grating 7 and converging action that are tightly attached to 5 inside of cylindrical barn door
It crosses and is arranged after different location exit slit 8, strength information is detected by corresponding detector 9.
The width of exit slit 8 can be configured according to the waveband width of mid-infrared light beam to be measured, highly narrow with incidence
It is identical to stitch 6.Detector 9 is close to exit slit 8, and DTGS detectors may be used, and detects the middle infrared signature of gas with various ingredient
Spectral peak is absorbed to analyze engine exhaust gas according to characteristic absorption peak spectral line.
When specific implementation, light source 1 uses cermet rod, heating to send out mid-infrared light beam.Mid-infrared light beam is incident on gas
Body pond 3, the discharge gas in gas cell 3 absorb mid-infrared light, and there is CO, CO in discharge gas2、NO、N2O、NH3、
And hydrocarbon etc., mid-infrared light are characteristically absorbed by sample gas, the middle infrared signature of gas with various absorbs spectral peak
It is distributed in different wavelength locations, specific distribution situation is as shown in table 1.
The absorption spectral peak distribution situation of each ingredient middle infrared spectrum in 1 discharge gas of table
According to the absorption spectral peak distribution situation of each ingredient mid infrared absorption spectrum in discharge gas shown in table 1 it is found that CO,
CO2、NO、N2O、NH3And hydrocarbon this six kinds of gases have different characteristics and absorb spectral peak.
From table 1 it follows that P12、P22、P31、P43、P53、P61The wavelength location interval of this six characteristic absorption spectral peaks is bright
Aobvious, corresponding test position spatially can be easily separated, and can obtain single spy by the way that the width of exit slit is arranged
Sign absorb spectral peak, can specifically be arranged the spectral region being emitted from slit be respectively 4710nm~4730nm, 14910nm~
14930nm, 5450nm~5470nm, 16880nm~16900nm, 10720nm~10740nm, 3225nm~3330nm.
By the intensity I for detecting outgoing beam1、I2、I3、I4、I5、I6So as to measure CO, CO2、NO、N2O、NH3And
The absorbance A of hydrocarbon1、A2、A3、A4、A5、A6, the concentration C of this six kinds of gases is obtained by absorbance1、C2、C3、C4、C5、
C6, wherein K1、K2、K3、K4、K5、K6For calibration factor, can be obtained by the detection of standard sample, since hydrocarbon is
The mixture of a kind of gas, therefore K here6Take the average value of this kind of gas.
Ci=KiAi(i=1,2,3,4,5,6,7,8)
In conclusion the present invention carries out the characteristic absorption spectral peak of mid-infrared light according to discharge gas the ingredient of discharge gas
And its content detection；Pass through the use of Rowland grating so that structure is simpler, compact；It is designed, is had higher by curing
Stability；By way of Multi-point detection, cost is significantly reduced.
To the model of each device in addition to doing specified otherwise, the model of other devices is not limited the embodiment of the present invention,
As long as the device of above-mentioned function can be completed.
It will be appreciated by those skilled in the art that attached drawing is the schematic diagram of a preferred embodiment, the embodiments of the present invention
Serial number is for illustration only, can not represent the quality of embodiment.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (3)
1. a kind of engine exhaust gas analyzer based on Rowland grating, including：Light source, the first parabolic mirror, gas
Pond, the second parabolic mirror, cylindrical barn door, entrance slit, Rowland grating, exit slit and detector, feature exist
In,
The light source, first parabolic mirror, the gas cell, second parabolic mirror composition sampling mould
Block；The cylinder barn door, the entrance slit, the Rowland grating, the exit slit and the detector group ingredient
Light detection module；
The light source is used to generate the transmitting light beam of infrared band in covering, and first parabolic mirror sends out the light source
The beam collimation gone out, and it is made to impinge perpendicularly at the gas cell；Engine exhaust gas to be measured is placed in the gas cell
Sample；
Wherein, the cylindrical used in sunshade board is provided with the entrance slit and the exit slit, the rowland thereon in shading
Grating is placed on the inside of the cylindrical barn door；
Infrared transmission light beam during second parabolic mirror is collected, and the incidence converged on the cylindrical barn door is narrow
At seam；The Rowland grating is divided the mid-infrared light beam dispersion entered by the entrance slit, and will be in different wave length
Infrared beam converges to the different location on the cylindrical barn door；
The mid-infrared light beam of different-waveband to be measured is emitted by the exit slit, and the width of the exit slit is according in be measured
The waveband width of infrared beam is configured；The detector is for detecting the mid-infrared light beam being emitted by the exit slit
Intensity.
2. a kind of engine exhaust gas analyzer based on Rowland grating according to claim 1, which is characterized in that institute
It states exit slit to be one-to-one relationship with the detector, be increased according to the quantity of the characteristic absorption spectral peak of discharge gas
Subtract.
3. a kind of engine exhaust gas analyzer based on Rowland grating according to claim 1, which is characterized in that institute
It states light source and uses cermet light source.
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| CN201610325751.XA CN106018315B (en) | 2016-05-17 | 2016-05-17 | A kind of engine exhaust gas analyzer based on Rowland grating |
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| CN201610325751.XA CN106018315B (en) | 2016-05-17 | 2016-05-17 | A kind of engine exhaust gas analyzer based on Rowland grating |
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| CN106018315B true CN106018315B (en) | 2018-09-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107764766A (en) * | 2017-12-08 | 2018-03-06 | 山东商业职业技术学院 | A kind of chilled aquatic products escaping gas analyzer |
| CN113625400B (en) * | 2020-05-08 | 2024-05-28 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN112098354A (en) * | 2020-09-21 | 2020-12-18 | 国网重庆市电力公司电力科学研究院 | Ultraviolet absorption spectroscopy-based SF6 decomposition component detection device and method |
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|---|---|---|---|---|
| CA2411413C (en) * | 2000-06-27 | 2011-05-03 | Alberta Research Council Inc. | Multiple pathlength spectrophotometer |
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| US4571074A (en) * | 1982-01-04 | 1986-02-18 | Instruments S.A. | Spectrometry device for analyzing polychromatic light |
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