DE2909688A1 - NON-DISPERSIVE INFRARED GAS ANALYZER - Google Patents
NON-DISPERSIVE INFRARED GAS ANALYZERInfo
- Publication number
- DE2909688A1 DE2909688A1 DE19792909688 DE2909688A DE2909688A1 DE 2909688 A1 DE2909688 A1 DE 2909688A1 DE 19792909688 DE19792909688 DE 19792909688 DE 2909688 A DE2909688 A DE 2909688A DE 2909688 A1 DE2909688 A1 DE 2909688A1
- Authority
- DE
- Germany
- Prior art keywords
- beam path
- measured
- gas
- cuvette
- dispersive infrared
- 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.)
- Withdrawn
Links
- 238000010521 absorption reaction Methods 0.000 claims description 12
- 230000005855 radiation Effects 0.000 claims description 3
- 230000002452 interceptive effect Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical class O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- G01N21/37—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using pneumatic detection
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)
Description
Die Erfindung ist eine weitere Ausgestaltung des in dem Patent (Patentanmeldung P 28 27 34-5.2) beschriebenen nichtdispersiven Infrarot-Gasanalysators, der so ausgebildet ist, daß der meßwertverfälschende, als Querempfindlichkeit des Analysators bezeichnete Einfluß von Gaskomponenten deren Absorptionsbanden die Absorptionsbande der zu messenden Gaskomponente überlappen, weitgehend unterdrückt ist. Dazu ist im Vergleichsstrahlenweg eine kürzere mit dem Probengas beschickte Küvette als im Meßstrahlenweg vorgesehen und im Meßstrahlenweg außerdem ein Interferenzfilter angeordnet, mit einer Absorptionskante im Überlappungsbereich und seiner Durchlässigkeit im übrigen Absorptionsbereich der zu messenden Gaskomponente. Durch geeignete Wahl der Küvettenlänge im Vergleichsstrahlenweg, Auswahl und Kippstellung eines für die jeweilige Meßaufgabe geeigneten Interferenzfilter ,kann die Querempfindlichkeit erheblich herabgesetzt werden.The invention is a further embodiment of the in the Patent (patent application P 28 27 34-5.2) described non-dispersive infrared gas analyzer, the is designed so that the measured value falsifying, as cross-sensitivity of the analyzer designated influence of Gas components whose absorption bands largely overlap the absorption band of the gas component to be measured is suppressed. For this purpose, there is a shorter cuvette charged with the sample gas in the comparison beam path than in the measuring beam path and an interference filter is also arranged in the measuring beam path, with an absorption edge in the overlap area and its permeability in the remaining absorption area the gas component to be measured. By suitable selection of the cuvette length in the comparison beam path, selection and tilt position an interference filter suitable for the respective measurement task , the cross-sensitivity can be reduced considerably.
Erstreckt sich der Überlappungsbereich einerThe overlap area extends one
Störkomponente über die ganze Absorptionsbande der zu messenden Gaskomponente, so läßt sich mit dieser Anordnung der Einfluß der störenden Gaskomponenten nicht in ausreichendem Maße unterdrücken. Der Erfindung liegt nun die Aufgabe zugrunde in solchen fällen durch zusätzliche Mittel die noch vorhandene Querempfindlichkeit weitgehend zu beseitigen. Die Aufgabe wird erfindungsgemäß durch die im Patentanspruch gekennzeichneten Mittel gelöst.Interference component over the entire absorption band of the to be measured Gas component, the influence of the interfering gas components cannot be suppressed to a sufficient extent with this arrangement. The invention is based on the object in such cases, the cross-sensitivity that is still present by means of additional means largely to be eliminated. The object is achieved according to the invention by the means characterized in the patent claim.
030038/0 334030038/0 334
29036882903688
In der Zeichnung ist ein Ausführungsbeispiel eines erfindungsgemäß ausgebildeten Infrarot-Gasanalysators dargestellt·In the drawing is an embodiment of one according to the invention trained infrared gas analyzer
Bei diesem Ausführungsbeispiel ist durch eine Strahlenleitvorrichtung 1 mit Infrarotlichtquelle 2 ein Heßstrahlenweg I und ein Vergleichsstrahlenweg II gebildet. Eine umlaufende Blendenscheibe 3 unterbricht periodisch die Strahlenbündel in beiden Strahlenwegen. Das zu messende Probengasgemisch durchströmt -die Küvetten 4 und 5 ia den Strahlenwegen, wobei die Küvette 5 im Vergleichsstrahlenweg wesentlich kurzer ist als die Küvette 4 im Meßstrahlenweg. Auf die beiden Küvetten folgt in jedem Strahlenweg ein Interferenzfilter 6 bzw. 7 und im Vergleichsstrahlenweg noch eine mit der zu messenden Gaskomponente gefüllte Küvette 8. Die beiden Strahlenbündel gelangen in die Kammern 9 und 10 einer üblichen Strahlungsempfangseinrichtung, in denen eine Strahlungsabsorption durch das eingefüllte, die zu messende Gaskomponente enthaltende Gas erfolgt und der Druckunterschied der beiden Kammern durch einen Membrankondensator gemessen wird. Beide Interferenzfilter sind so gewählt, daß jeweils eine Absorptionskante im Überlappungsbereich der Banden der Störgaskomponenten und der zu messenden Gaskomponente liegt.In this exemplary embodiment, a beam guide device is used 1 with infrared light source 2, a Heßstrahlweg I and a comparison beam path II are formed. A circumferential Orifice plate 3 periodically interrupts the beam in both beam paths. The sample gas mixture to be measured flows through -the cuvettes 4 and 5 generally correspond to the beam paths, whereby the Cuvette 5 in the comparison beam path is significantly shorter than the cuvette 4 in the measuring beam path. The two cuvettes are followed in each beam path by an interference filter 6 or 7 and in the comparison beam path Another cuvette 8 filled with the gas component to be measured. The two bundles of rays enter the Chambers 9 and 10 of a conventional radiation receiving device, in which a radiation absorption by the filled, the to measuring gas component containing gas takes place and the pressure difference of the two chambers by a membrane condenser is measured. Both interference filters are chosen so that there is an absorption edge in the overlap area of the bands the interfering gas components and the gas component to be measured.
-5--5-
030038/0334030038/0334
Durch entsprechende Einstellung und Dimensionierung der beiden Interferenzfilter und der Küvetten kann für ein Probengas das störende Gaskomponenten enthält, deren Absorptionsbanden die Absorptionsbande der Heßkomponente ganz überlappen, ein guter Querempfindlichkeitsabgleich erzielt werden.By setting and dimensioning the two interference filters and the cuvettes accordingly, the contains interfering gas components, the absorption bands of which completely overlap the absorption band of the Hess component, a good one Cross-sensitivity adjustment can be achieved.
Beispielsweise hat sich gezeigt, daß bei einem Meßbereich von 500 ppm NO und Störgasanteilen von 10 % CO, 16 % CO2 und gesättigten Wasserdampf in einem Gasgemisch von 24° C der Heßfehler für den Meßbereichendwert <1 % ist. Dabei ist eine vollständige Überlappung der Absorptionsbande des NO durch die H^O-Bande gegeben. Demgegenüber ergab die entsprechende Messung mit der ursprünglichen Anordnung einen Meßfehler von bis zu 20 % am Heßbereichendwert.For example, it has been shown that with a measuring range of 500 ppm NO and interfering gas components of 10 % CO, 16 % CO 2 and saturated water vapor in a gas mixture of 24 ° C, the heat error for the measuring range end value is <1 % . There is a complete overlap of the absorption band of the NO by the H ^ O band. In contrast, the corresponding measurement with the original arrangement resulted in a measurement error of up to 20% at the end value of the Hess range.
030038/0334030038/0334
LeerseiteBlank page
Claims (1)
Probengas beschickte, jedoch kürzere Küvette befindet, sowie
mit einer Modulationsvorrichtung für beide Strahlenbündel undNon-dispersive infrared gas analyzer with a measuring beam path in which a cuvette charged with the sample gas and an adjustable interference filter are arranged and with a comparison beam path in which one with the
Sample gas charged, but shorter cuvette is located as well
with a modulation device for both beams and
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792909688 DE2909688A1 (en) | 1979-03-12 | 1979-03-12 | NON-DISPERSIVE INFRARED GAS ANALYZER |
| US06/046,549 US4288693A (en) | 1978-06-22 | 1979-06-07 | Nondispersive infrared gas analyzer |
| GB8008345A GB2048465A (en) | 1979-03-12 | 1980-03-12 | A non-dispersive infra-red gas analyser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792909688 DE2909688A1 (en) | 1979-03-12 | 1979-03-12 | NON-DISPERSIVE INFRARED GAS ANALYZER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE2909688A1 true DE2909688A1 (en) | 1980-09-18 |
Family
ID=6065179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19792909688 Withdrawn DE2909688A1 (en) | 1978-06-22 | 1979-03-12 | NON-DISPERSIVE INFRARED GAS ANALYZER |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE2909688A1 (en) |
| GB (1) | GB2048465A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2952464A1 (en) * | 1979-12-27 | 1981-07-02 | Siemens AG, 1000 Berlin und 8000 München | NON-DISPERSIVE INFRARED GAS ANALYZER |
| DE3243301A1 (en) * | 1981-11-26 | 1983-06-01 | Horiba Ltd., Kyoto | NON-DISPERSIVE INFRARED GAS ANALYZER |
| US5900635A (en) * | 1995-09-29 | 1999-05-04 | Instrumentarium Oy | Correction of collision broadening in non-dispersive absorption measurement of gases |
| CN103900961A (en) * | 2014-03-17 | 2014-07-02 | 西安交通大学 | Three-gas-chamber switching device of spectrograph and gas online spectrum testing method |
-
1979
- 1979-03-12 DE DE19792909688 patent/DE2909688A1/en not_active Withdrawn
-
1980
- 1980-03-12 GB GB8008345A patent/GB2048465A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2952464A1 (en) * | 1979-12-27 | 1981-07-02 | Siemens AG, 1000 Berlin und 8000 München | NON-DISPERSIVE INFRARED GAS ANALYZER |
| DE3243301A1 (en) * | 1981-11-26 | 1983-06-01 | Horiba Ltd., Kyoto | NON-DISPERSIVE INFRARED GAS ANALYZER |
| US5900635A (en) * | 1995-09-29 | 1999-05-04 | Instrumentarium Oy | Correction of collision broadening in non-dispersive absorption measurement of gases |
| CN103900961A (en) * | 2014-03-17 | 2014-07-02 | 西安交通大学 | Three-gas-chamber switching device of spectrograph and gas online spectrum testing method |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2048465A (en) | 1980-12-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8120 | Willingness to grant licences paragraph 23 | ||
| 8130 | Withdrawal |