DE2655062A1 - Photometric nitrogen oxide determination - in exhaust gases contg. sulphur di:oxide using a tilted interference filter - Google Patents
Photometric nitrogen oxide determination - in exhaust gases contg. sulphur di:oxide using a tilted interference filterInfo
- Publication number
- DE2655062A1 DE2655062A1 DE19762655062 DE2655062A DE2655062A1 DE 2655062 A1 DE2655062 A1 DE 2655062A1 DE 19762655062 DE19762655062 DE 19762655062 DE 2655062 A DE2655062 A DE 2655062A DE 2655062 A1 DE2655062 A1 DE 2655062A1
- Authority
- DE
- Germany
- Prior art keywords
- interference filter
- oxide
- determination
- exhaust gases
- nitrogen oxide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 239000007789 gas Substances 0.000 title claims abstract description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title 1
- 239000005864 Sulphur Substances 0.000 title 1
- 239000003546 flue gas Substances 0.000 claims description 2
- 238000002834 transmittance Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 5
- 230000035699 permeability Effects 0.000 abstract description 2
- 239000002912 waste gas Substances 0.000 abstract 3
- 230000002411 adverse Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 3
- 230000002452 interceptive effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
Vorrichtung zur Bestimmung von Stickoxid Device for the determination of nitric oxide
Die Erfindung betrifft eine Vorrichtung zur Bestimmung von Stickoxid nach Patent 24 07 133, wobei im Strahlenweg an Stelle eines Monochromators ein Interferenzfilter vorgesehen ist.The invention relates to a device for determining nitrogen oxide according to patent 24 07 133, with an interference filter in the beam path instead of a monochromator is provided.
Enthält das zu analysierende Probengasgemisch außer Stickoxid weitere Gase, die ein der Meßkomponente überlagertes, wellenlängenabhängiges Absorptionsvermögen aufweisen, so wird der Meßwert für die Meßkomponente verfälscht. Die photometrische Vorrichtung weist eine "QuerempSindlichkeit" gegenüber dem störenden Begleitgas auf. So muß bei der Messung von NO in Abgas und Luft mit einem erheblichen Anteil an SO2 gerechnet werden. Da SO2 in dem benutzten, durch das Interferenzfilter festgelegten Wellenlängenbereich, , ein von der Wellenlänge abhängiges Absorptionsvermögen aufweist, wird das lçießergebnis fehlerhaft.If the sample gas mixture to be analyzed contains more than nitrogen oxide Gases that have a wavelength-dependent absorption capacity superimposed on the measuring component have, the measured value for the measuring component is falsified. The photometric The device has a "cross-sensitivity" to the interfering accompanying gas on. For example, when measuring NO in exhaust gas and air, a considerable proportion must be used can be counted on SO2. Because SO2 is used in the, through the interference filter set Wavelength range,, has an absorption capacity dependent on the wavelength, the loosening result will be faulty.
Die Erfindung stellt sich die Aufgabe, die photometrische Vorrichtung so einzurichten, daß sich die Querempfindlichkeit weitgehend unterdrücken läßt. Erfindungsgemäß gelingt dies dadurch, daß das Interferenzfilter kippbar und in der gekippten Lage feststellbar ist.The invention has the object, the photometric device to be set up in such a way that the cross-sensitivity can be largely suppressed. According to the invention, this is achieved in that the interference filter is tiltable and in the tilted position can be determined.
Durch das Kippen des Interferenzfilters wird dessen Absorption wellenlängenabhängig verändert. Es kann eine Kippstellung gefunden werden, bei der die ursprünglich vorhandene Querempfindlichkeit des Photometers gegenüber störenden Begleitgasen auf ein Minimum herabgesetzt ist. Bei der Messung des NO in Rauchgasen mit hohem S02-Anteil ist ein Interferenzfilter mit einer Bandbreite vom 60-120 A, vorteilhaft, bei der Messung des NO im Motorenabgasen mit geringerem Anteil an SO2 eines mit einer Bandbreite von 20-60 A. Besonders vorteilhaft sind Bilter mit einer Schiefverteilung der Durchlässigkeit mit der ellenlänge.By tilting the interference filter, its absorption becomes dependent on the wavelength changes. A tilt position can be found in which the originally existing Cross-sensitivity of the photometer to interfering accompanying gases to a minimum is reduced. When measuring NO in flue gases with a high proportion of S02, an interference filter with a bandwidth of 60-120 A, advantageous for the measurement of the NO in the engine exhaust with a lower proportion of SO2 one with a bandwidth from 20-60 A. Bilter with a skewed distribution of permeability are particularly advantageous with the ellen length.
Die Wirksamkeit der erfindungsgemäßen Maßnahme wird anhand der Zeichnung demonstriert, die ein Diagramm einer NO-Konzentrationsmessung von Verbrennungaluft bei Anwesenheit von S02 vergleichsweise mit dem bekannten und dem erfindungsgemäßen Gerät wiedergibt. Auf der Ordinate ist die Querempfindlichkeit in Prozent Meßfehler der NO-Konzentration aufgetragen und auf der abszisse die SO2-Konzentration, wobei die Kurve F1 die Querempfindlichkeit des bekannten Gerätes zeigt und die Kurve F2 die Querempfindlichkeit des erfindungsgemäßen Gerätes. Es ist ersichtlich, daß bis 50 Xo ansteigende Meßfehler bei SO-Konzentrationswerte bis 1200 ppm durch die Erfindung auf Fenlerwerte unter 1-2 % reduziert werden. Besonders hervorzuheben ist noch, daß die Nullpunktstabilität durch die erfindungsgemäße Maßnahme nicht wesentlicher beeinträchtigt wird.The effectiveness of the measure according to the invention is based on the drawing demonstrates a diagram of a NO concentration measurement of combustion air in the presence of SO2, it is compared with the known and the inventive Device is playing. The cross-sensitivity is on the ordinate as a percentage of the measurement error plotted the NO concentration and on the abscissa the SO2 concentration, where the curve F1 shows the cross sensitivity of the known device and the curve F2 the cross-sensitivity of the device according to the invention. It can be seen that Up to 50 Xo increasing measurement errors at SO concentration values up to 1200 ppm due to the Invention can be reduced to fenler values below 1-2%. Of particular note is still that the zero point stability by the measure according to the invention is not is significantly impaired.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19762655062 DE2655062A1 (en) | 1976-12-04 | 1976-12-04 | Photometric nitrogen oxide determination - in exhaust gases contg. sulphur di:oxide using a tilted interference filter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19762655062 DE2655062A1 (en) | 1976-12-04 | 1976-12-04 | Photometric nitrogen oxide determination - in exhaust gases contg. sulphur di:oxide using a tilted interference filter |
Publications (2)
Publication Number | Publication Date |
---|---|
DE2655062A1 true DE2655062A1 (en) | 1978-06-08 |
DE2655062C2 DE2655062C2 (en) | 1989-05-18 |
Family
ID=5994701
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19762655062 Granted DE2655062A1 (en) | 1976-12-04 | 1976-12-04 | Photometric nitrogen oxide determination - in exhaust gases contg. sulphur di:oxide using a tilted interference filter |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2655062A1 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2407133A1 (en) * | 1974-02-15 | 1975-08-21 | Deutsche Forsch Luft Raumfahrt | METHOD AND DEVICE FOR DETERMINING NITROGEN OXIDE |
-
1976
- 1976-12-04 DE DE19762655062 patent/DE2655062A1/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2407133A1 (en) * | 1974-02-15 | 1975-08-21 | Deutsche Forsch Luft Raumfahrt | METHOD AND DEVICE FOR DETERMINING NITROGEN OXIDE |
Also Published As
Publication number | Publication date |
---|---|
DE2655062C2 (en) | 1989-05-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8110 | Request for examination paragraph 44 | ||
AF | Is addition to no. |
Ref country code: DE Ref document number: 2407133 Format of ref document f/p: P |
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D2 | Grant after examination | ||
8364 | No opposition during term of opposition | ||
8327 | Change in the person/name/address of the patent owner |
Owner name: DEUTSCHE FORSCHUNGSANSTALT FUER LUFT- UND RAUMFAHR |