DE1110442B - Infrared radiation measuring device for gas analysis - Google Patents
Infrared radiation measuring device for gas analysisInfo
- Publication number
- DE1110442B DE1110442B DES52334A DES0052334A DE1110442B DE 1110442 B DE1110442 B DE 1110442B DE S52334 A DES52334 A DE S52334A DE S0052334 A DES0052334 A DE S0052334A DE 1110442 B DE1110442 B DE 1110442B
- Authority
- DE
- Germany
- Prior art keywords
- radiation
- measuring device
- gas analysis
- radiation measuring
- infrared radiation
- 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.)
- Pending
Links
- 230000005855 radiation Effects 0.000 title claims description 16
- 238000004868 gas analysis Methods 0.000 title claims description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 14
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 7
- 239000001569 carbon dioxide Substances 0.000 claims description 7
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 230000008030 elimination Effects 0.000 claims 1
- 238000003379 elimination reaction Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 10
- 238000010521 absorption reaction Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003595 spectral effect 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)
Description
Ultrarotstrahlungsmeßgerät für die Gasanalyse Bei den bekannten Ultrarotstrahlungsmeßgeräten durchdringt die von einem oder zwei Temperaturstrahlern ausgehende Strahlung auf zwei Strahlungswegen eine Meßkammer mit dem Gas, dessen Zusammensetzung bestimmt werden soll, und eine Vergleichskammer mit einem neutralen Gas. Die in der Meßkammer bzw. der Vergleichskammer nicht absorbierte Strahlung trifft auf je einen Empfänger. Die beiden Empfänger sind in Differenz geschaltet und wirken selektiv, d. h., sie absorbieren im wesentlichen die gleiche Strahlung wie das zu untersuchende Gas. Bei derartigen Geräten wird die Anzeige häufig durch Beimengungen von Kohlendioxyd in dem zu untersuchenden Gasgemisch gestört. Kohlendioxyd besitzt eine sehr intensive Strahlenabsorption in einem engen Wellenlängenbereich um 4,25 . Selbst geringe Beimengungen von Kohlendioxyd, wie sie in der Luft enthalten sind, wirken sich bereits störend aus. Durch Versuche wurde gefunden, daß sich der C O2-Einfluß beseitigen läßt, wenn gemäß der Erfindung in mindestens einem Strahlungsweg eine Platte, Scheibe oder Folie aus Tetrafluoräthylen eingeschaltet ist. Es wurde ermittelt, daß Tetrafluoräthylen, das unter dem Handelsnamen »Teflon« in Gebrauch ist, eine sehr intensive Absorptionsbande im Strahlungsgebiet von 4,25 P zeigt, die nur 0,6 cm breit ist. Das Material hat nach kleineren Wellenlängen hin keine weiteren störenden Absorptionsbanden, so daß die Anzeige anderer Gase nicht beeinflußt wird. Außerdem ist es bis zu Wellenlängen von 7,5 p durchlässig. Es kann somit in einem verhältnismäßig breiten Spektralgebiet der Einfluß des Kohlendioxyds ausgeschaltet werden.Ultrared radiation measuring device for gas analysis In the known ultrared radiation measuring devices penetrates the radiation emanating from one or two thermal radiators two radiation paths a measuring chamber with the gas, whose composition is determined and a comparison chamber with a neutral gas. The one in the measuring chamber or the radiation not absorbed by the comparison chamber hits one receiver each. The two receivers are connected in a differential mode and act selectively, i. h., they absorb essentially the same radiation as the gas to be examined. In such devices, the display is often due to the addition of carbon dioxide disturbed in the gas mixture to be examined. Carbon dioxide is very intense Radiation absorption in a narrow wavelength range around 4.25. Even small admixtures carbon dioxide, as it is contained in the air, already have a disturbing effect the end. Experiments have found that the C O2 influence can be eliminated if according to the invention in at least one radiation path a plate, disc or Tetrafluoroethylene film is switched on. It has been determined that tetrafluoroethylene, which is in use under the trade name "Teflon", a very intense absorption band in the radiation area of 4.25 P, which is only 0.6 cm wide. The material has after smaller wavelengths no further interfering absorption bands, so that the display of other gases is not influenced. Plus it's up to wavelengths of 7.5 p permeable. It can thus cover a relatively wide spectral range the influence of carbon dioxide can be eliminated.
In der schematischen Darstellung der Zeichnung wird ein Ausführungsbeispiel der Erfindung gezeigt. An exemplary embodiment is shown in the schematic representation of the drawing of the invention shown.
In einem Strahlungsmeßgerät bekannten Aufbaues trifft die Strahlung zweier gleichartiger Temperaturstrahler 1 und 2 durch eine Meßkammer 3 und eine Vergleichskammer 4 auf die Empfängerkammern 5 und 6. Die Kammer 3 wird von dem zu untersuchenden Gasgemisch durchströmt, während die Kammer 4 ein neutrales Vergleichsgas enthält. Die Kammern 5 und 6 sind gewöhnlich mit dem gleichen Gas gefüllt, dessen Gehalt in dem Gasgemisch bestimmt werden soll, das die Kammer 3 durchströmt. Als Meßeffekt wird die Temperaturdifferenz in den Kammern 5 und 6 mittels bekannter Widerstandsthermometer bestimmt. In dem Strahlungsweg, der die Meßkammer durchsetzt, befindet sich gemäß der Erfindung eine Folie 7 aus Tetrafluoräthylen, welche die Absorptionsbande des Kohlendioxyds eliminiert. Die Folie hat zweckmäßig eine Dicke von 0,1 bis 0,3 mm. Es hat sich gezeigt, daß eine solche Folie bei einem auf Methan ansprechenden Gasanalysegerät die unerwünschte Empfindlichkeit für Kohlendioxyd mindestens um den Faktor 3 herabsetzt. Die Anzeigeempfindlichkeit für Methan wird praktisch nicht verringert.The radiation strikes in a radiation measuring device of known construction two similar temperature radiators 1 and 2 through a measuring chamber 3 and one Comparison chamber 4 to the receiving chambers 5 and 6. The chamber 3 is from the to gas mixture to be examined flows through, while chamber 4 is a neutral reference gas contains. Chambers 5 and 6 are usually filled with the same gas, whose Content in the gas mixture is to be determined, which flows through the chamber 3. as The temperature difference in chambers 5 and 6 is measured using a known measuring effect Resistance thermometer determined. In the radiation path that penetrates the measuring chamber, is according to the invention a film 7 made of tetrafluoroethylene, which the Absorption band of carbon dioxide eliminated. The film expediently has a thickness from 0.1 to 0.3 mm. It has been shown that such a film is based on methane appealing gas analyzer the unwanted sensitivity to carbon dioxide reduced by at least a factor of 3. The display sensitivity for methane will be practically not reduced.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES52334A DE1110442B (en) | 1957-02-14 | 1957-02-14 | Infrared radiation measuring device for gas analysis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES52334A DE1110442B (en) | 1957-02-14 | 1957-02-14 | Infrared radiation measuring device for gas analysis |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1110442B true DE1110442B (en) | 1961-07-06 |
Family
ID=7488674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DES52334A Pending DE1110442B (en) | 1957-02-14 | 1957-02-14 | Infrared radiation measuring device for gas analysis |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1110442B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE957427C (en) * | 1952-03-20 | 1957-01-31 | Saint Gobain | Device for determining the sulfur dioxide content of gas mixtures |
-
1957
- 1957-02-14 DE DES52334A patent/DE1110442B/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE957427C (en) * | 1952-03-20 | 1957-01-31 | Saint Gobain | Device for determining the sulfur dioxide content of gas mixtures |
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