DE2827345A1 - NON-DISPERSIVE INFRARED GAS ANALYZER - Google Patents
NON-DISPERSIVE INFRARED GAS ANALYZERInfo
- Publication number
- DE2827345A1 DE2827345A1 DE19782827345 DE2827345A DE2827345A1 DE 2827345 A1 DE2827345 A1 DE 2827345A1 DE 19782827345 DE19782827345 DE 19782827345 DE 2827345 A DE2827345 A DE 2827345A DE 2827345 A1 DE2827345 A1 DE 2827345A1
- Authority
- DE
- Germany
- Prior art keywords
- gas
- cuvette
- measuring
- absorption
- gas analyzer
- 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- Withdrawn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 14
- 230000005855 radiation Effects 0.000 claims description 11
- 230000035699 permeability Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 22
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000002452 interceptive effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound 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 betrifft einen riichtdispersiven Infrarot-Gasanalysator wie er im Oberbegriff des Patentanspruchs Λ definiert und beispielsweise in der deutschen Patentschrift 730 478 beschrieben ist.The invention relates to a directionally dispersive infrared gas analyzer as defined in the preamble of patent claim Λ and described, for example, in German patent 730 478.
Befinden sich in dem zu analysierenden Probengasgemisch Gaskomponenten welche die Absorptionsbanden der zu messenden Gaskomponente überlappen, so können insbesondere bei sehr geringen Meßgaskonzentrationen erhebliche Meßfehler auftreten. Es sind deshalb schon zahlreiche Vorschläge gemacht worden, mit dem Ziel diese als Querempfindlichkeit bezeichnete Eigenschaft des Analysators möglichst weitgehend zu beseitigen. So ist in der D.^-Os'25 32. 165 auf Seite 6, zweiter Absatz ' erwähnt, daß dazu Interferenzfiltersche. '>en benutzt werden können. Um damit eine gute Wirkung zu erzielen, muß ··· aktisch. alle Strahlung im Bereich der Überlappung durch das filter von der Strahlungsempfangsei-iiricrvang ferngehalten worden. Dadurch geht aber viel Strahlungsenergie für den MeßVorgang verloren. Außerdem hat sich herausgestellt, daß es praktisch kaum möglich ist jeweils ein en~rbrechendes Filter vorzusehen, bzw. ausfindig zu machen, 'as eine optimale Wirkung gewährleistet.If there are gas components in the sample gas mixture to be analyzed which overlap the absorption bands of the gas component to be measured, considerable measurement errors can occur, particularly with very low measurement gas concentrations. Numerous proposals have therefore already been made with the aim of eliminating this property of the analyzer, known as cross-sensitivity, as far as possible. Second paragraph Os'25 32. 165 on page 6, 'mentioned that to Interferenzfiltersche - as is in the D ^.. '> en can be used. In order to achieve a good effect with it, ··· must be active. all radiation in the area of the overlap has been kept away from the radiation receiving device by the filter. As a result, however, a lot of radiation energy is lost for the measuring process. In addition, it has been found that it is practically hardly possible to provide or find a break-in filter in each case, as ensures an optimal effect.
Ferner kann bei fotometrischen Zweistrahlgasami , aε Loren (US-PS 27 61 067) die yuerempfindiichkei t durch Verwendung von Strahlenbündeln unterschiedlicher Woller'änge in Ver-Furthermore, with photometric two-jet gasami, aε Loren (US-PS 27 61 067) the yuersensiichkei t through use of bundles of rays of different lengths in
909882/0U1909882 / 0U1
■;RiG?i\lAL FNSPEUTEn■; RiG? I \ lAL FNSPEUTEn
COPY \ BAD ORIGINALCOPY \ BAD ORIGINAL
bindung mit unterschiedlich langen, in den Strahlenwe^en anfvordneten und mit dem Probengas beschickten Küvetten, verringert werden.Binding with different lengths, which are required in the radiation channels and cuvettes charged with the sample gas will.
Es ist die Aufgabe der Erfindung einen nichtdispersiven Iiifrarot-Gasanalysator nach dem Oberbegriff des Anspruches 1, so auszubilden daß er eine besonders geringe Querempfindlichkeit aufweist, bzw. die Querempfindlichkeit praktisch bis auf den Wert "Null" abgeglichen werden kann. Diese Aufgabe wird erfindungsgemäß durch die im Anspruch 1 gekennzeichneten Mittel gelöst. Die Unteransprüche beinhalten vorteilhafte Weiterbildungen des Erfindungsgegenstandes nach Anspruch 1. Dabei wird unter anderem die Eigenschaft von Interferenzfiltern ausgenutzt, daß die spektrale Durchlässigkeit sich mit der Winkelstellung zur Strahlenrichtung ändert.It is the object of the invention to provide a non-dispersive infrared gas analyzer according to the preamble of claim 1, so designed that it has a particularly low cross sensitivity has, or the cross-sensitivity can be adjusted practically down to the value "zero". This object is achieved according to the invention solved by the means characterized in claim 1. The subclaims contain advantageous developments the subject matter of the invention according to claim 1. There among other things, the property of interference filters is used, that the spectral transmittance changes with the angular position to the beam direction.
Die Zeichnung zeigt ein Ausführungsbeispiel eines nichtdispersiven Infrarot-Gasanalysators nach der Erfindung, das im folgenden erläutert wird.The drawing shows an embodiment of a non-dispersive one Infrared gas analyzer according to the invention, which will be explained in the following.
Der Analysator weist eine Infrarot-Strahlungsquelle 1 auf, deren Strahlung durch eine Leitvorrichtung 2 einem Strahlenweg I, dem Meßstrahlenweg und einem Strahlenweg II, dem Vergleichsstrahlenweg zugeführt ist. Die beiden St Taillenbund el werden durch eine rotierende Blendenscheibe 3 abwechselnd unterbrochen. Das zu analysierende Gasgemisch durchströmtThe analyzer has an infrared radiation source 1, their radiation through a guide device 2, a beam path I, the measuring beam path and a beam path II, the comparison beam path is fed. The two St Waistbund el are alternately by a rotating aperture disk 3 interrupted. The gas mixture to be analyzed flows through
9 0 9 8 8 2 / 0 U 1 -b-9 0 9 8 8 2/0 U 1 -b-
-. ... ■ copy-. ... ■ copy
-G--G-
in den Strahlenwegen angeordnete unterschiedlich lange Küvetten 4 und 5> wobei sich die längere Küvette im Meßstrahlenweg befindet. Eine weitere Küvette 6 im Vergleichsstrahlenweg, die mit einem die Infrarotstrahlung nicht absorbierenden Gas gefüllt ist, dient lediglich dazu,in beiden Strahlenwegen bezüglich der Küvettenlängen symmetrische Verhältnisse herzustellen.Cuvettes 4 and 5> of different lengths arranged in the beam paths the longer cuvette is in the measuring beam path. Another cuvette 6 in the comparison beam path, which is filled with a gas that does not absorb the infrared radiation, is only used in both Establish beam paths symmetrical with respect to the length of the cuvette.
Die aus den Küvetten austretenden periodisch unterbrochenen Strahlenbündel gelangen in Absorptionskammern 7 und 8 einer mit der zu messenden Gaskomponente gefüllten Differenzdruckmeßeinrichtung 9· Die entstehenden, mit Hilfe eines Membrankondensatörs 10 ,ermittelten Druckdifferenzen zwischen den Absorptionskammern sind ein Maß für den Anteil der im Probengas zu bestimmenden Gaskomponente.Those emerging from the cuvettes are periodically interrupted Beams of rays reach absorption chambers 7 and 8 of a differential pressure measuring device filled with the gas component to be measured 9 · The resulting, with the help of a membrane condenser 10, determined pressure differences between the absorption chambers are a measure of the proportion of the sample gas gas component to be determined.
Zwischen der !Cuvette 4- im Meßstra^ienweg und der Absorptionskammer 7 cLer Differenzdruckmeßeinrichtung ist ein Interferenzfilter 11 angeordnet, das wie durch Pfeile angedeutet, über den Querschnitt des Strahlenbünde ·. verschiebbar unc/oder kippbar ist. Eine Blende 12 im Yo-j-j.eich^strahlenweg ermöglicht den exakten Nullabgleich für den Fall, daß das Proben gas die Gaskomponente nicht enthält.An interference filter is located between the Cuvette 4 in the measuring path and the absorption chamber 7 in the differential pressure measuring device 11 arranged, which, as indicated by arrows, over the cross section of the ray bundles ·. movable unc / or is tiltable. An aperture 12 in the Yo-j-j.eich ^ strahlenweg allows the exact zero adjustment in the event that the sample gas does not contain the gas component.
Die Bandbreite des Interferenzfilters ist so gewählt, daß eine Absorptionskante im Überlappungsbereich der AbsorptionsbandeThe bandwidth of the interference filter is chosen so that an absorption edge is in the overlap area of the absorption band
909882/0U1909882 / 0U1
der Gaskoinponente und der Absorptionsban.de des stöivnden Gasbestandteiles bzw- der störenden Gasbestandteile liegt und die volle Durchlässigkeit im übrigen Absorptionsbereich de*· Gaskomponente gegeben ist. Damit; wird der Einfluß der störenden Begleitgase auf das Meßergebnis bereits erheblich verringert. Eine weitere besonders starke Unterdrückung wird durch die St rahlungs ab sorption des Probengases in der Küvette·; I hervorgerufen, deren günstigste Länge durch einen Versuch zu ermitteln ist. Schließlich kann es sich zur Erzielung eines Optimums an Wirkung als zweckmäßig erweisen, das Interferenzfilter 11 nicht, über den gesamten Querschnitt dei; öt rvjMlonbündels einzuführen und es auch gegenüber dex· Strahlungseinrichtung zu kippen.the gas component and the absorption band.de of the interfering gas component or the disruptive gas component and full permeability in the remaining absorption range of the gas component is given. In order to; the influence of the interfering accompanying gases on the measurement result is already considerably reduced. Another particularly strong suppression is achieved by the radiation absorption of the sample gas in the cuvette ·; I , the most favorable length of which can be determined through an experiment. Finally, in order to achieve the best possible effect, it can prove to be expedient not to use the interference filter 11 over the entire cross-section of the dei; öt insert the rvjMlon bundle and tilt it towards the dex · radiation device.
Mit dem erfindungsgemäßen Analysator ergab sich bspw. bei der Messung von Hexan im Automobilgas, Meßbereich 300 ppm, bei einem Anteil von 15 % COp, nur eine Anzeigeänderung entsprechend 1 ppm Hexan. Praktisch unbeeinflußt blieb die Anzeige bei einem Anteil von 10 % CO und einem Wasserdampfante.il entsprechend einer Sättigung bei. 20 C. Die Länge der Küvette M betrug 190 mm, die der Küvette 5 0,2 mm.With the analyzer according to the invention, for example, when measuring hexane in automobile gas, measuring range 300 ppm, with a proportion of 15 % COp, there was only one change in the display corresponding to 1 ppm hexane. The display remained practically unaffected with a proportion of 10 % CO and a water vapor content corresponding to saturation. 20 C. The length of the cuvette M was 190 mm, that of the cuvette 5 0.2 mm.
909882/0U1909882 / 0U1
COPYCOPY
LeerseiteBlank page
Claims (2)
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19782827345 DE2827345A1 (en) | 1978-06-22 | 1978-06-22 | NON-DISPERSIVE INFRARED GAS ANALYZER |
FR7908000A FR2434385A1 (en) | 1978-06-22 | 1979-03-30 | NON-DISPERSITIVE GAS ANALYZER WITH INFRARED RADIUS |
US06/046,549 US4288693A (en) | 1978-06-22 | 1979-06-07 | Nondispersive infrared gas analyzer |
NL7904593A NL7904593A (en) | 1978-06-22 | 1979-06-12 | DISPERSION-FREE INFRARED GAS ANALYZER. |
GB7921315A GB2024417A (en) | 1978-06-22 | 1979-06-19 | Non-dispersive infrared gas analyser |
JP7823479A JPS552998A (en) | 1978-06-22 | 1979-06-22 | Nonndispersion infrared gas analyzer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19782827345 DE2827345A1 (en) | 1978-06-22 | 1978-06-22 | NON-DISPERSIVE INFRARED GAS ANALYZER |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2827345A1 true DE2827345A1 (en) | 1980-01-10 |
Family
ID=6042421
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19782827345 Withdrawn DE2827345A1 (en) | 1978-06-22 | 1978-06-22 | NON-DISPERSIVE INFRARED GAS ANALYZER |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS552998A (en) |
DE (1) | DE2827345A1 (en) |
FR (1) | FR2434385A1 (en) |
GB (1) | GB2024417A (en) |
NL (1) | NL7904593A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0038064A2 (en) * | 1980-04-14 | 1981-10-21 | Fuji Electric Co. Ltd. | Gas analyser for the determination of the ammonia content in a mixture of gases |
DE3243301A1 (en) * | 1981-11-26 | 1983-06-01 | Horiba Ltd., Kyoto | NON-DISPERSIVE INFRARED GAS ANALYZER |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS573698A (en) * | 1980-06-09 | 1982-01-09 | Mitsubishi Heavy Ind Ltd | Dry cleaning machine |
JPS5784100A (en) * | 1980-11-13 | 1982-05-26 | Mitsubishi Heavy Ind Ltd | Dry cleaning machine |
JPS5784099A (en) * | 1980-11-13 | 1982-05-26 | Mitsubishi Heavy Ind Ltd | Dry cleaning machine |
JPH0696069B2 (en) * | 1989-03-28 | 1994-11-30 | 三洋電機株式会社 | Washing machine |
CA2026844C (en) * | 1989-10-05 | 1999-05-11 | Tadashi Nukaga | Drum-type washing machine |
JP2007154593A (en) * | 2005-12-08 | 2007-06-21 | Asahi Kasei Construction Materials Co Ltd | Joint structure of external facing panel |
-
1978
- 1978-06-22 DE DE19782827345 patent/DE2827345A1/en not_active Withdrawn
-
1979
- 1979-03-30 FR FR7908000A patent/FR2434385A1/en not_active Withdrawn
- 1979-06-12 NL NL7904593A patent/NL7904593A/en not_active Application Discontinuation
- 1979-06-19 GB GB7921315A patent/GB2024417A/en not_active Withdrawn
- 1979-06-22 JP JP7823479A patent/JPS552998A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0038064A2 (en) * | 1980-04-14 | 1981-10-21 | Fuji Electric Co. Ltd. | Gas analyser for the determination of the ammonia content in a mixture of gases |
EP0038064A3 (en) * | 1980-04-14 | 1982-04-28 | Fuji Electric Co. Ltd. | Gas analyser for the determination of the ammonia content in a mixture of gases |
DE3243301A1 (en) * | 1981-11-26 | 1983-06-01 | Horiba Ltd., Kyoto | NON-DISPERSIVE INFRARED GAS ANALYZER |
Also Published As
Publication number | Publication date |
---|---|
GB2024417A (en) | 1980-01-09 |
JPS552998A (en) | 1980-01-10 |
NL7904593A (en) | 1979-12-28 |
FR2434385A1 (en) | 1980-03-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OAM | Search report available | ||
OC | Search report available | ||
8120 | Willingness to grant licences paragraph 23 | ||
8139 | Disposal/non-payment of the annual fee |