DE9010621U1 - Optical arrangement for measuring the concentration of gases and liquids in process measurement technology - Google Patents
Optical arrangement for measuring the concentration of gases and liquids in process measurement technologyInfo
- Publication number
- DE9010621U1 DE9010621U1 DE9010621U DE9010621U DE9010621U1 DE 9010621 U1 DE9010621 U1 DE 9010621U1 DE 9010621 U DE9010621 U DE 9010621U DE 9010621 U DE9010621 U DE 9010621U DE 9010621 U1 DE9010621 U1 DE 9010621U1
- Authority
- DE
- Germany
- Prior art keywords
- optical arrangement
- light
- absorption cell
- optical
- liquids
- 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.)
- Expired - Lifetime
Links
- 230000003287 optical effect Effects 0.000 title claims description 20
- 238000005259 measurement Methods 0.000 title claims description 7
- 239000007788 liquid Substances 0.000 title claims description 5
- 238000005516 engineering process Methods 0.000 title claims description 4
- 239000007789 gas Substances 0.000 title claims description 4
- 238000000034 method Methods 0.000 title claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 9
- 230000005855 radiation Effects 0.000 claims description 4
- 239000004809 Teflon Substances 0.000 claims description 3
- 229920006362 Teflon® Polymers 0.000 claims description 3
- 238000005286 illumination Methods 0.000 claims description 3
- 230000003595 spectral effect Effects 0.000 claims description 2
- 238000001228 spectrum Methods 0.000 claims 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 244000309464 bull Species 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000002834 transmittance Methods 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
- G01N21/255—Details, e.g. use of specially adapted sources, lighting or optical systems
-
- 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
- G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/02—Mechanical
- G01N2201/024—Modular construction
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/08—Optical fibres; light guides
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)
- Optical Measuring Cells (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Description
Optische Anordnung zur Absorptionsmessung an Gasen und Flüssigkeiten in der ProzeBmeBtechnik Optical arrangement for absorption measurement of gases and liquids in process measurement technology
Die Neuerung betrifft eine optische Anordnung zur Absorptions messung an Gasen und Flüssigkeiten in der Prozeßmeßtechnik nach dem Oberbegriff des Schute anspruchts 1.The innovation concerns an optical arrangement for absorption measurement of gases and liquids in process measurement technology according to the generic term of claim 1.
Bisherige Anordnungen der e. g. Art sind koaplsü aufgebaut, störanfällig oder bedürfen häufiger NachjustiePrevious arrangements of this type are coaxially constructed, prone to failure or require frequent readjustment
Aufgabe der vorliegenden Erfindung ist es ein preisgünstiges Photometer zur Absorpt. . amersung azi C^sen u»>.d Flüssigkeiten bereitzustellen, ,.Elches kor"»kte Auemaße hat, aus wenigen Komponenten besteht und das nur ein ^-nimmm an Wartung und Justierung benötigt.The object of the present invention is to provide an inexpensive photometer for the absorption and amperage of carbon monoxide and liquids, which has correct dimensions, consists of few components and requires only a small amount of maintenance and adjustment.
Diese Aufgabe wirr) durch den kennzeichnenden Teil des Schutzanspruchs 1 gelöst.This problem is solved by the characterising part of claim 1.
nie übrigen Schutzansprüche beschreiben vorteilhafte Ausge-&iacgr; staltungen der Erfindung.The remaining claims describe advantageous embodiments of the invention.
Im folgenden wird ein Ausführv.ngsbeispiel anhand der Figur näher erläutert.In the following, an example implementation is explained in more detail using the figure.
Das modular aufgebaute Photometer besteht aus den drei quaderförmigen Bauteilen, Beleuchtungsmodul 1, Absorptionszelle 8 und Detektorhalterung 11, von denen mindestens die Absorptionszelle aus Teflon besteht. Das Material für die beiden anderen Teile kann beliebig gewählt werden. Diese drei Bauteile werden von oben durch eine Halteplatte 17 mit Hxlfe von Schrauben zusammengehalten.The modular photometer consists of three cuboid-shaped components, illumination module 1, absorption cell 8 and detector holder 11, of which at least the absorption cell is made of Teflon. The material for the other two parts can be chosen freely. These three components are held together from above by a holding plate 17 with the help of screws.
Die Halteplatte 17 weist Längeschlitze für die Halteschrauben und Löcher an den Stellen für die verschiedenen DurchführungenThe retaining plate 17 has longitudinal slots for the retaining screws and holes at the locations for the various bushings
auf. Diese Ausnehmungen in der Halteplatte 17 sind in der Figur nicht dargestellt.These recesses in the holding plate 17 are not shown in the figure.
Das Beleuchtungsmodul 1 weist eine zylindrische Bohrung von oben nach unten auf in deren Mitte die optische Achse 6 verläuic und deren oberes und unteres Ende passend zur Aufnahme der Lichtquelle 2 und des Strahl:-^Jetektors 4 erweitert sind.The lighting module 1 has a cylindrical bore from top to bottom, in the middle of which the optical axis 6 runs and whose upper and lower ends are extended to accommodate the light source 2 and the beam jet detector 4.
Die Bohrung beginnt etwa in der Mitte der Seite, welche zur Halteplatte 17 weist. Im unteren Drittel der nach f.ißen weisenden Stirnfläche de-&agr; Moduls 1 beginnt eine weitere zylindrische durchgehende Bohrung gleichen Durchmessers, deren Mif-e die optische Achse 7 bildet. Beide Bohrungen verlaufen so daß sich die beiden optischen Achsen senkrecht im Punkt 16 treffen. Das nach außen weisende Ende der zweiten Bohreng ist zur Aufnahme der Lichtquelle 3 passend erweitert. An der Kante die von der Seite die den Detektor 4 enthält und der von Seite die an der Küvette 8 anliegt gebildet wird beginnt ein Längsschlitz zur passenden Aufnahme des dichroitischen Spiegels 5 der so nach innen führt, daß der Schnittpunkt 16 der optischen Achse 6, 7 in der Spiegelmitte liegt und daß diese Achsen je einen Winkel von vorzugsweise 45' mit einer Spiegel f.ächennormalen durch diesen Punkt 16 bilden. Die Fläche des Spiegels 5 ist so bemessen, daß der Spiegel 5 mindestens die lichte Weite der beiden Bohrungen überdeckt.The hole begins approximately in the middle of the side facing the holding plate 17. In the lower third of the end face of the module 1 facing outwards , there is another cylindrical through hole of the same diameter, the center of which forms the optical axis 7. Both holes run so that the two optical axes meet vertically at point 16. The outward-facing end of the second hole is widened to accommodate the light source 3. On the edge formed by the side containing the detector 4 and the side that rests against the cuvette 8, there is a longitudinal slot for the appropriate accommodation of the dichroic mirror 5, which leads inwards so that the intersection point 16 of the optical axis 6, 7 is in the middle of the mirror and that these axes each form an angle of preferably 45' with a mirror surface normal through this point 16. The surface of the mirror 5 is dimensioned such that the mirror 5 covers at least the clear width of the two holes.
Als Lichtquellen können Leuchtdioden mit verschiedenen Emi^sionsbereichen oder Glühlampen mit verschiedenen Interferenzfiltern verwendet werden. Durch Einsatz von geeigneten Sammellinsen kann paralleles Licht erzeug: werden. Die Emissionsbereiche dt»" Lichtquellen, die derzeit den SpeKtralbereich von 300 nm bis 5000 mn abdecken, müssen an das Ma&bgr;problern angepaßt sein. Das dichroitische Filter wird so gewählt, daß die steile Änderung von Reflexions- und Transmissionsvermögen optimal zwischen den Emissionsbereichen der Lichtquellen 2, 3 liegt.Light sources can be light-emitting diodes with different emission ranges or light bulbs with different interference filters. Parallel light can be generated by using suitable converging lenses. The emission ranges of the light sources, which currently cover the spectral range from 300 nm to 5000 nm, must be adapted to the measurement problem. The dichroic filter is selected so that the steep change in reflectance and transmittance lies optimally between the emission ranges of the light sources 2, 3.
5 -5 -
Die Küvette 8 enthält eine Bohrung, deren Mitte mit der optischen Achse 7 übereinstimmt, deren Durchmesser kleiner ist als der der Bohrungen im Modul 1. Die beiden Enden sind zur Aufnahme von Halteteilen 10 mit Innengp'inde für die Küvettenfenster 3 erweitert. Die Flächen am Übergang dieser Erweiterungen zur Bohrung sind plan. Die Halteteile 10 sind mit dem Küvettengehäuse verbunden.The cuvette 8 contains a hole, the center of which coincides with the optical axis 7, the diameter of which is smaller than that of the holes in the module 1. The two ends are extended to accommodate holding parts 10 with inner pins for the cuvette windows 3. The surfaces at the transition of these extensions to the hole are flat. The holding parts 10 are connected to the cuvette housing.
10 passen werden mit Hilfe von Ringen 14 mit Außengewinde,
welches zum Innengewinde der Halteteile 10 paßt, gegen die
plane Fläche gedrückt. Durch die Verwendung an Teflon kann auf weitere Dichtmaßnahmen verzichtet werden.10 will fit with the help of rings 14 with external thread,
which fits the internal thread of the holding parts 10, against the
flat surface. By using Teflon, further sealing measures are not necessary.
Halteteile 10 und Halteringe 14 sind aus Metall, die Fenster
aus Glas, Quarz o. ä.Holding parts 10 and retaining rings 14 are made of metal, the windows
made of glass, quartz or similar.
Als Zu- und Ablauf für das zu untersuchende Medium dienen Bohrungen 9 die von der Oberseite bis zur Küvettenbohrung reichen. Holes 9 that extend from the top to the cuvette hole serve as inlet and outlet for the medium to be examined.
Dieser Küvette schlieBt sich die Detektorhalter-ung an. welche
eine kleine Ausnehmung zur Aufnahme eines weiteren Strahlungsdetektors 12 und eine große Ausnehmung 15 aufweist. This cuvette is followed by the detector holder, which
a small recess for accommodating a further radiation detector 12 and a large recess 15.
In der großen Ausnehmung 15 kann der Verstärker für den Detektor 15 untergebracht werden.The amplifier for the detector 15 can be accommodated in the large recess 15.
Die gesamte Anordnung ist gegen das Eindringen von Freadlicht
in geeigneter Weise geschützt.The entire arrangement is protected against the penetration of light
protected in an appropriate manner.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE9010621U DE9010621U1 (en) | 1990-07-14 | 1990-07-14 | Optical arrangement for measuring the concentration of gases and liquids in process measurement technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE9010621U DE9010621U1 (en) | 1990-07-14 | 1990-07-14 | Optical arrangement for measuring the concentration of gases and liquids in process measurement technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE9010621U1 true DE9010621U1 (en) | 1990-09-20 |
Family
ID=6855634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE9010621U Expired - Lifetime DE9010621U1 (en) | 1990-07-14 | 1990-07-14 | Optical arrangement for measuring the concentration of gases and liquids in process measurement technology |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE9010621U1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4215165A1 (en) * | 1991-11-08 | 1993-06-03 | Tiltscher Helmut Prof Dr | Miniaturised raster scanning light source, e.g. for spectral photometer - sequentially activates two or more different sources in UV to IR region by electrical switching |
| DE4324118A1 (en) * | 1993-07-19 | 1995-01-26 | Kayser Threde Gmbh | Method and a device for determining the emission rate of at least one gas component of a gas mixture |
| DE4324154A1 (en) * | 1993-07-19 | 1995-02-02 | Kayser Threde Gmbh | Device and method for analysis, with high spatial resolution, of at least one gas component in a gas mixture |
| DE19607167A1 (en) * | 1995-05-16 | 1996-11-21 | Laserspec Analytik Gmbh | Light source add-on module for atomic absorption spectrometer |
-
1990
- 1990-07-14 DE DE9010621U patent/DE9010621U1/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4215165A1 (en) * | 1991-11-08 | 1993-06-03 | Tiltscher Helmut Prof Dr | Miniaturised raster scanning light source, e.g. for spectral photometer - sequentially activates two or more different sources in UV to IR region by electrical switching |
| DE4324118A1 (en) * | 1993-07-19 | 1995-01-26 | Kayser Threde Gmbh | Method and a device for determining the emission rate of at least one gas component of a gas mixture |
| DE4324154A1 (en) * | 1993-07-19 | 1995-02-02 | Kayser Threde Gmbh | Device and method for analysis, with high spatial resolution, of at least one gas component in a gas mixture |
| DE19607167A1 (en) * | 1995-05-16 | 1996-11-21 | Laserspec Analytik Gmbh | Light source add-on module for atomic absorption spectrometer |
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