WO2007022895A2 - Dispositif de mesure pour la determination optique d'une concentration de gaz polluant par transmission - Google Patents

Dispositif de mesure pour la determination optique d'une concentration de gaz polluant par transmission Download PDF

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Publication number
WO2007022895A2
WO2007022895A2 PCT/EP2006/008016 EP2006008016W WO2007022895A2 WO 2007022895 A2 WO2007022895 A2 WO 2007022895A2 EP 2006008016 W EP2006008016 W EP 2006008016W WO 2007022895 A2 WO2007022895 A2 WO 2007022895A2
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WO
WIPO (PCT)
Prior art keywords
detection means
measuring device
transmission
detection
gas
Prior art date
Application number
PCT/EP2006/008016
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German (de)
English (en)
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WO2007022895A3 (fr
Inventor
Michael Hanko
Jürgen HEINZE
Sara Rentmeister
Original Assignee
Albert-Ludwigs-Universität Freiburg
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Application filed by Albert-Ludwigs-Universität Freiburg filed Critical Albert-Ludwigs-Universität Freiburg
Publication of WO2007022895A2 publication Critical patent/WO2007022895A2/fr
Publication of WO2007022895A3 publication Critical patent/WO2007022895A3/fr

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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
    • G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
    • G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
    • G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
    • G01N21/783—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour for analysing gases
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/24—Suction devices
    • 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
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/03—Cuvette constructions
    • G01N21/031—Multipass arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
    • G01N31/22—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using chemical indicators

Definitions

  • the present invention relates to a measuring device for the optical determination of the concentration of at least one noxious gas in transmission, as well as a corresponding method.
  • noxious gas refers to a gaseous and / or vaporous component of a gas mixture.
  • test tubes for example, the company Dräger, Lübeck, which are filled with an impregnated with an indicator substance silica gel. Flows through a noxious gas, for which the recorded in the silica gel indicator substance is sensitive, the test tube, as a result of the reaction with the indicator substance forms a gradually colored zone whose intensity and time course is related to the concentration of the gas to be detected. This color zone is visually evaluated according to its progress in the detector tube, and the gas concentration is read from a scale printed on the tube.
  • a disadvantage of this known prior art is that, due to the visual evaluation of the test tube, there is a large reading inaccuracy, especially in the presence of diffuse ink zone boundaries.
  • Another major disadvantage is that the known test tubes have a relatively low sensitivity, or the measurement time must be relatively long, since a visually perceptible color change must be a high mole conversion.
  • the object of the present invention is therefore to provide a measuring device with which the concentration of noxious gases can be quickly and accurately determined in a simple manner
  • a measuring device for optically determining the concentration of at least one noxious gas in transmission comprising a light-transmissive measuring cell with a receptacle in which a tube-shaped, at least partially transparent, preferably optically transparent detection means which On its inner wall at least partially a translucent, preferably optically transparent charge having a predetermined layer thickness of at least one polymeric material with an immobilized in this indicator substance is arranged, further comprising a detection means upstream or downstream pumping or suction device, which directs a noxious gas flow through the detection means, as well as at least one light source and at least one receiver means, which are arranged on one and / or more sides of the detection means, by means of which in transmission an absorption change of the indicator substance as a function of time is measured, wherein the receiver means with a Evaluation unit is connectable.
  • the measurement device has the great advantage that reproducible measurement results can be obtained very quickly by the pumping or suction device via the detection means, and the pollutant gas concentration can be determined by measurement in transmission with high accuracy.
  • the carrier means of the detection means is preferably arranged at least partially translucent, more preferably made of a transparent and clear, in particular gas-impermeable material, for example of glass and / or suitable plastics.
  • the measuring device according to the invention is not spatially sensitive with regard to the positioning of the detection means, since just in contrast to the prior art, no color zone course is measured.
  • the polymeric material applied at least partly on the inner wall for the layer to be applied to the detection means is preferably selected from a group comprising polysiloxanes, polycarbonates, polyacrylates, polymethacrylates, perfluoropolyethers, polystyrenes, polyolefins, polyisocyanates, polyols, polyamines, polyamides, polyesters, Polyvinyls, polyimines, polyglycols, polyphenylene oxides, polysulfones and / or polyethersulfones and their derivatives.
  • the materials to be used according to the invention can also be used as copolymers, preferably as block copolymers. Silicone-polycarbonate block copolymers are particularly preferred here.
  • the coating of the detection agent can contain both pure polymers and polymer mixtures. Likewise, a synthesis of the polymeric material on the detection means of precursor substances is possible with simultaneous or subsequent immobilization of the indicator reagent. It can also be provided that the coating of the detection means consists of several layers, these layers each having different indicator substances. However, it can also be provided that a plurality of different indicator substances are accommodated in a single layer.
  • the indicator substance is preferably a color indicator, in particular homogeneously incorporated in the polymeric material, which is preferably soluble in the polymeric material, and more preferably selected from a group comprising diphenylamine, indigo, o-tolidine, phenylenediamine and / or bromophenol blue or theirs Derivatives, with particular preference being given to diphenylamine, 4,4'-dinonoxy-7,7'-dimethoxyindigo, o-tolidine, N, N'-diphenyl-1,4-phenylenediamine and / or bromophenol blue.
  • a color indicator in particular homogeneously incorporated in the polymeric material, which is preferably soluble in the polymeric material, and more preferably selected from a group comprising diphenylamine, indigo, o-tolidine, phenylenediamine and / or bromophenol blue or theirs Derivatives, with particular preference being given to diphenylamine, 4,4
  • the indicator substance is immobilized in the polymeric material.
  • the immobilization can be carried out in particular via hydrogen bonds. Therefore, as polymeric materials in the context of the present invention, those polymers are preferred which have chemical groups for the formation of hydrogen bonds.
  • chemical groups both CO groups, which act as acceptors of hydrogen atoms in the formation of a hydrogen bond, as well as OH, NH, NH 2 and SH groups, which act as donors of hydrogen atoms, come into question.
  • the preferred polymeric material preferably in the layer formed has a high permeability for the component to be detected of the gas mixture, ie the / the pollutant gases (s) on.
  • the immobilization of the indicator substance in the polymeric material takes place via the dipole-dipole interactions, Van der Waals interactions or even via covalent bonds.
  • the detection means is produced by coating a carrier with a polymeric material and the at least one indicator substance to be immobilized in it.
  • the application of the coating can be carried out by any known method, for example by brushing or brushing, atomizing, dip-coating, spraying or molding.
  • the production of the detection means can be carried out inexpensively.
  • the coating of the detection means has a total thickness in a range from about 0.1 ⁇ m to about 1 mm, the layer thickness is preferably in a range from about 0.1 ⁇ m to about 50 ⁇ m, even more preferably in a range from about 1 ⁇ m to about 20 ⁇ m.
  • the choice of the thickness of the layer of the polymeric material with the indicator substance immobilized in this depends inter alia also on the latter, in particular with what amount of the indicator substance the polymeric material can be loaded.
  • the amount of the indicator substance in the polymeric material is in a range from about 0.1% by weight to about 120% by weight, based on the particular polymeric material used.
  • the amount of indicator substance incorporated in the polymeric material is dependent on the one hand on the chemical compatibility of the polymeric material with the respective indicator substance, and on the other hand of the layer thickness of the polymeric material used. By increasing the amount of indicator substance in the polymeric material, the sensitivity can be significantly increased.
  • the indicator substance is preferably applied together with the polymeric material on the carrier of the detection means.
  • the noxious gas preferably flows essentially by convection through the detection means. As a result, the measurement of the noxious gas can be done very quickly.
  • the measuring device has a tube-shaped detection means.
  • the inner wall of the tube-shaped detection means is at least partially, ie provided in the region of the measuring beam, with the coating.
  • the gas-impermeable tube serves as a carrier for the coating.
  • the coating of the carrier with a polymeric material and at least one immobilized in this indicator substance by dip coating is then simply removed by means of a solvent such as acetone, or the tube is externally protected by a removable medium, eg, Tesafilm, during the dip-coating process.
  • the design of the detection means in the form of a tube has the great advantage that on the one hand, the tube before insertion into the measuring device gas-tight by means of, for example, films which are arranged on both ends of the detection tube, can be closed by methods according to the prior art. Contamination of the detection means before use in the measuring device according to the invention is thus reliably avoided.
  • the films are preferably designed such that they can be opened easily by piercing. Appropriate tools for this purpose are provided in the receptacle of the measuring cell, in which case sealing means which are accommodated in a groove and which act sealingly against the ends of the tube-shaped detection means.
  • any other receptacle can be provided which is suitable for enabling a sealing means for sealing the detection means within the measuring cell of the measuring device according to the invention.
  • the sealant is preferably formed as a sealing ring, which may also be formed profiled.
  • the at least one receiver means is designed as a photodiode, phototransistor and / or photoresistor.
  • the receiver means is designed cloverixd.
  • the measuring device preferably has a pumping or suction device, which sucks the noxious gas at a constant, preferably high volume flow in a range of preferably about 100 to 10,000 ml / min, more preferably about 1000 to 2000 ml / min.
  • the noxious gas is thereby guided uniformly over the sensitive layer of the detection means.
  • the pumping or suction device is subsequently arranged the detection means in the measuring device according to the invention, wherein the pumping or suction device can also be arranged within the measuring cell with sufficient miniaturization.
  • the noxious gas stream is uniformly sucked over the sensitive layer of the detection means.
  • the measuring device has a humidity and / or temperature and / or mass flow sensor.
  • This can be arranged upstream or downstream of the detection means, preferably downstream of the detection means, but still in front of the pumping or suction device.
  • the humidity and / or temperature and / or mass flow sensor is preferably connected to the same evaluation unit as the measuring cell, wherein in addition the pumping device can also be connected to the evaluation unit.
  • the evaluation unit advantageously comprises an AD converter for digitizing the measurement signal, and advantageously a PC interface for controlling and evaluating the Measurement data by means of a software or a microcontroller for PC-independent operation on site.
  • a wall of the receptacle of the measuring cell is at least partially provided with a reflective surface.
  • the light source and the receiver means can be arranged on one side, but optionally also on opposite sides of the detection means, for example.
  • An increase in the sensitivity of the measuring device according to the invention can also be achieved by providing, for example, a plurality of light sources and receiver means. Under certain circumstances, light sources with different wavelengths can be used.
  • the determination of the noxious gas concentration in the UWVIS and / or nIR range so that corresponding light sources can be used.
  • the wavelength of the corresponding light sources is matched to the indicator substance used. Therefore, in order to achieve the greatest possible flexibility of the measuring device according to the invention, therefore, either a plurality of light sources of particular wavelength are selected with regard to the indicator substance or the pollutant gas concentration to be determined, but it is also possible to select a light source which operates over a broad wavelength range.
  • the present invention further relates to a detection tube and a method for the optical determination of at least one noxious gas in transmission, wherein at a constant volume flow, a noxious gas stream is passed through a arranged in a measuring cell detection means, formed in the form of a tube, which is a coating of at least one polymeric material in which at least one indicator substance is immobilized, wherein at least one light beam is passed through the detection means, and wherein at least in a partial area, the speed of the measurable transmission or voltage change, from which an absorption change of the indicator substance can be determined, and / or the The speed of the absorption change runs approximately linearly with the harmful gas concentration to be measured. This advantageously makes it possible to carry out very precise determinations of harmful gas concentrations.
  • Harmful gases which are preferably determined by means of the measuring device and detection tube according to the invention and the method according to the invention are nitrogen oxides, in particular nitrogen dioxide, sulfur dioxide, ozone, chlorine, ammonia and / or hydrogen sulphide.
  • the light beam is guided at least twice through the detection means.
  • the detection means has a tubular shape with a coating of a polymeric material with at least one indicator substance immobilized on the inner wall thereof
  • the light beam is guided through the coating at least twice by the transmission measurement, which in addition to the coating caused by the curvature of the Coating caused enlargement of the irradiated sensitive surface in addition to an increase in the sensitivity of the inventive method contributes.
  • the light beam is repeatedly guided through the particular tube-shaped detection means by a reflective layer applied at least partially on a wall of the receptacle, a considerable increase in the sensitivity of the method according to the invention is achieved.
  • FIG. 1 shows a perspective view of a detection means according to the invention for a measuring device according to the invention
  • FIG. 2 shows a schematic representation of the detection means together with the gas-tight foils which can be applied at the ends thereof;
  • FIG. 3 shows a schematic representation of the measuring device according to the invention
  • FIG. 4 shows a sectional view through a measuring cell of the measuring device according to the invention in a plane passing through the light source and the receiver means;
  • FIG. 5 shows a cross section through the measuring cell of FIG. 4 in a through the
  • FIG. 8 shows a fourth embodiment of the measuring cell using a light guide or forming a light entry shaft; 9 shows a plot of the measured voltage change with the measuring cell according to the invention against the measuring time in the determination of nitrogen dioxide at a concentration of 2 ppm according to Example 1;
  • FIG. 10 shows a plot according to FIG. 9 at a nitrogen dioxide concentration of
  • FIG. 11 shows a plot of the determined nitrogen dioxide concentration against the
  • FIG. 1 shows in a perspective view a total of a detection means designated by the reference numeral 16, which has a tube-shaped carrier means 17 with a coating 18 applied to the inner wall 28 thereof.
  • a flow channel 40 is provided in the interior of the detection means 16. Through this flow channel 40, the noxious gas is passed.
  • Fig. 2 shows for clarity the construction of the detection tube 16 in detail, 16 here gas-impermeable films 32.1 and 32.2 are arranged on the ends 30.1 and 30.2 of the detection tube.
  • a detection tube 16 designed in this way can be stored for a long time and, at the same time, reliably prevent contamination with harmful gases from the ambient air. It can be filled with a protective gas.
  • the films 32.1 and 32.2 are preferably formed pierceable.
  • FIG. 3 schematically shows the construction of a measuring device 10 according to the invention.
  • This comprises a measuring cell 12, a humidity and temperature sensor 34 and a pump device 20, wherein the protruding elements are connected to an evaluation unit 26.
  • the connection between the humidity and temperature sensor 34 takes place in this case via terminals 52, that of the pumping device 20 by means of connections 54.
  • the humidity and temperature sensor 34 is arranged between the measuring cell 12 and the pumping device 20, wherein the pumping device 20 below the measuring cell 12 with respect to the marked by arrows 50 (Schad-) Gas flow is arranged.
  • the measuring cell 12 has a receptacle 14, in which a tube-shaped detection means 16 is received.
  • a light source 22 is arranged on one longitudinal side of the detection means 16, and a light receiver 24 is arranged opposite this on the other longitudinal side of the detection means 16. Between these, a light channel 46, represented by an arrow, is arranged.
  • the light source 22 is connected via connections 42, the receiver means 24, which is preferably designed as a photodiode, via terminals 44 to the evaluation unit 26.
  • the light source 22 is also preferably designed as an LED.
  • a voltage change is first detected which can be recalculated in the evaluation unit 26 in a transmission change and thus an absorption change as a function of time can be determined.
  • an unknown pollutant gas concentration can then be determined. Calibration is also possible directly via the voltage change.
  • the measuring cell 12 is formed in two parts, with a preferably fixed part 13.1 and a movable part 13.2.
  • the movable part 13.2 can be placed in the direction of arrows 38 on the immovable part 13.1.
  • the movable part 13.2 is releasably connected to the stationary part 13.1, so that it is possible to use a detection means 16 formed by a tubular support means 17 with a coating 18 arranged on its inner wall, this also being gas-tight at both ends Foil can be closed.
  • the part 13.1 or 13.2 of the measuring cell 12 has a groove 58.1 or 58.2, which is formed circumferentially.
  • sealing means 56.1 and 56.2 are added, which preferably as O-rings with a flattened cross-section are formed.
  • the mandrels 60 and 62 are preferably formed annularly circumferentially without interruption. If, with the measuring cell 12 open, the detection means 16 is inserted into the fixed part 13.1 in the direction of the arrows 38, a gas-tight foil of the detection means 16 arranged at the fixed part 13.1 is punctured by the ring-shaped mandrel 60, in which case the detection means 16 is due to the arranged in the groove 58.1 sealant 56.1 is prevented from contamination with the Atmo- sphere within the measuring cell. Subsequently, the movable part 13.2 of the measuring cell 12 is placed in the direction of arrows 38, wherein the arranged at the end facing the end of the detection means 16 film is pierced by the annular dome 62 accordingly.
  • a protective gas can always be passed through the device 10.
  • an electrical contact is closed, which starts the measuring process. Puncturing of both closure foils during placement of the part 13.2 in approximately the same time is also possible. In this way, a continuous flow channel 40 is formed, in which by means of the light channel 46 in transmission a guided by the detection means 16 noxious gas concentration can be determined.
  • the supply lines to the measuring cell 12 can be freed from contaminating noxious gases in advance, the supply lines, which are not shown here in detail, being provided in particular with stop valves, so that from the resulting line pieces simply via a connection, which also has a valve , possible noxious gases can be deducted and replaced by a neutral atmosphere or a protective gas. Subsequently, the gas to be measured can then be passed through the detection means 16 in a constant volume flow, generated by means of the pumping device 20.
  • Fig. 5 shows the measuring cell 12 shown in Fig. 4 in a cross section, guided by the plane of the light source and the receiver means 24, whereby the principle of determining a noxious gas concentration in transmission and the guidance of the light channel 46 is again illustrated.
  • FIG. 6 now shows an alternative measuring cell 12 which, in contrast to that shown in FIG. 4, has a total of three light sources 22 and correspondingly three receiver means 24, in particular designed as photodiodes.
  • the sensitivity of the measuring device 10 can be considerably increased, but it is also possible light, that in Buffalo of multiple indicator substances that are sensitive to different noxious gases, here matched to this different light sources 22 are used, ie those with different wavelengths. Accordingly, the receiver means 24 are then formed here.
  • FIG. 7 now shows a third embodiment of a measuring cell 12, in which case the inner wall 36 of the tubular receptacle 14 is formed with a reflecting surface.
  • the light source 22 and the receiver means 24 are arranged on one side of the detection means 16 in the fixed part 13.1 of the measuring cell 12. The arrangement takes place at an angle to each other.
  • the path of a light beam emitted by the light source 22 is reproduced with an arrow 48 which, in the example given, is reflected seven times on the reflective inner wall 36 of the tubular receptacle 14 before it strikes the receiver means 24. This also makes a considerable increase in the sensitivity of the measuring device 10 possible.
  • FIG. 8 shows a fourth embodiment of a measuring cell 12, the light source 22 being arranged here in the stationary part 13.1 on its front side, whereas a total of four receiver means 24 are arranged on the opposite side, relative to the detection means 16.
  • a light guide 68 is arranged, which allows a light channel 16 over the entire cross-sectional area. As a result, the cross section of the output from the light source 22 light channel is considerably expanded.
  • the light source 22 is subsequently formed with a light entry shaft 68, which has a reflective layer on a wall 70, so that, as shown by way of example at the two light beams 48, the light reflects there on this wall 70 and onto the receiver means 24 is headed.
  • This also results in a fanning out of the width of the light beam emitted by the light source 22, so that a voltage or transmission change can be detected by means of a plurality of receiver means 24.
  • the light source 22 can in principle be designed such that it additionally has focusing means, as a result of which a further increase in the sensitivity of the measuring device 10 is achieved.
  • Example 1
  • the glass tubes made of borosilicate glass of the mark Sl MAX ® , Kavalier, Sonzava, Czech Republic, 3 cm in length, with an outer diameter of 6 mm and a wall thickness of 1 mm at room temperature in a solution of 70 vol .-% of conc , Sulfuric acid and 30 vol .-% Wasserstoffproxidges (30% in water) for one hour in an ultrasonic bath.
  • the glass tubes were washed three times with distilled water and dried in an oven at 50 0 C overnight.
  • silicone-polycarbonate membrane product name SSP-M213, Specialty Silicone Products, Inc., New York, USA
  • a solution of 18 mg of N, N'-diphenyl-1 , 4-phenylenediamine (Aldrich, Steinheim, Germany) in 10 ml chloroform pa (Aldrich, Steinheim, Germany) and stirred until the dissolution of the membrane.
  • the glass tubes were attached at one end by means of a spring arm tweezers to a height adjustable by means of a stepping motor holding device, product name BGS60 the company EAS GmbH, Rheinberg, Germany.
  • the glass tubes were at a rate of 36 cm • min "1 immersed in the prepared solution to a depth of 2.8 cm, and after 10 s at a speed of 22.5 cm ⁇ min" 1 again from the solution pulled out.
  • the glass tubes coated internally and externally in this way were dried vertically for 30 minutes in room air.
  • the inside and outside coated glass tubes were rubbed on the outside with an acetone-soaked, lint-free cloth.
  • the detection tubes thus produced with a layer thickness of the coating of about 1 .mu.m were suitable for the determination of nitrogen dioxide in gaseous samples.
  • the measuring cell used for the measurement consisted of an LED with 435 nm peak wavelength as light source and a photodiode with integrated OPT-301 operational amplifier from Burr-Brown (reference: GMS, Düsseldorf, Germany) as photoreceiver.
  • the analog voltage signal of the photoreceiver was measured by means of a 12-bit A / D
  • Converter module LTC 1293 (manufacturer: Linear Technology) converted into a digital voltage signal.
  • content of the gaseous sample was determined directly after the exit of the gas from the detection tube using a digital humidity and temperature sensor SHT75 from Driesen + Kern GmbH, Bad Bramstedt, Germany.
  • the reactivity of the prepared detection tube with respect to nitrogen dioxide was in dry gaseous samples having an average temperature of 24.7 0 C ⁇ 1, 5 0 C and a volume fraction of nitrogen dioxide in synthetic air (20.5% O 2 in N 2 (Messer Griesheim GmbH , Krefeld, Germany)) between 2 ppm and 25 ppb.
  • the nitrogen dioxide was taken from test gas cylinders (Messer Griesheim GmbH, Krefeld, Germany) and the desired concentration and volume flow by diluting with synthetic air by means of mass flow controllers type F-201C-RAA-33-E Bronkhorst Hi-Tec, Ruurlo, Netherlands, discontinued.
  • the voltage signal of the photoreceiver changed linearly with time (see FIGS. 9 and 10), ie. H. the rate at which the voltage signal of the photoreceiver changed was approximately constant at a given gas concentration in the initial region.
  • the speed with which the voltage signal of the photoreceiver changed was determined from the range of the voltage change from -15 to -200 mV, when the latter value was not reached up to a measuring duration of 180 s.
  • the preparation of the detection tubes was carried out as in Example 1, but the coating solution consisted of 800 mg of silicone-polycarbonate membrane (product name SSP-M213, Specialty Silicone Products, Inc., New York, USA), which was treated with a solution of 4 mg 4,4'-dinonoxy-7,7-dimethoxy-indigo (Dr. G. Voss, University of Bayreuth, Germany) in 10 ml chloroform pa (Aldrich, Steinheim, Germany) and stirred until the dissolution of the membrane.
  • the detection tubes thus produced with a layer thickness of the coating of about 2 ⁇ m were suitable for the determination of ozone in gaseous samples.
  • the measuring cell used for the measurements differed from the measuring cell used in Example 1 in the LED used as the light source. At this point an LED with a peak wavelength of 650 nm (product name ELD-650-523 from Roithner Lasertechnik, Vienna, Austria) was used.
  • the reactivity of the detection tubes prepared to ozone was ppm in dry gaseous samples having an average temperature of 22.9 0 C ⁇ 1, 5 0 C and a volume fraction of ozone in air between 340 and ppb examined 25th It also found a linear relationship between the rate at which the voltage signal of the photoreceptor changed at the beginning of the measurement and the concentration of ozone. With the aid of the linear calibration function thus obtained, it was possible to determine unknown concentrations of ozone in gaseous samples with the aid of the described detection tubes for the detection of ozone.
  • the coating material used for the detection tubes is stable over a period of at least 6 months.

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Abstract

L'invention vise à créer un dispositif de mesure permettant de déterminer aisément et rapidement la concentration d'un gaz polluant. A cet effet, le dispositif de mesure pour la détermination optique de la concentration d'au moins un gaz polluant par transmission comprend une cellule de mesure opaque dotée d'un logement dans lequel est disposé un moyen de détection de forme tubulaire partiellement opaque, lequel moyen de détection comporte sur sa paroi interne, au moins partiellement, une couche opaque d'une épaisseur donnée et composée d'au moins une matière polymère dans laquelle est immobilisée au moins une substance indicatrice. Le dispositif comporte également un dispositif de pompage ou d'aspiration disposé en amont ou en aval du moyen de détection, ce dispositif de pompage ou d'aspiration faisant passer un flux de gaz polluant à travers le moyen de détection, ainsi qu'au moins une source lumineuse et au moins un moyen récepteur, lesquels sont placés sur une ou plusieurs faces du moyen de détection pour mesurer une modification d'absorption de la substance indicatrice par transmission en fonction du temps, le moyen récepteur étant relié à une unité d'analyse.
PCT/EP2006/008016 2005-08-20 2006-08-14 Dispositif de mesure pour la determination optique d'une concentration de gaz polluant par transmission WO2007022895A2 (fr)

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DE102005039539.2 2005-08-20
DE200510039539 DE102005039539B3 (de) 2005-08-20 2005-08-20 Messvorrichtung zur optischen Bestimmung einer Schadgaskonzentration in Transmission sowie ein Detektionsmittel als auch ein Verfahren hierfür

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WO2007022895A2 true WO2007022895A2 (fr) 2007-03-01
WO2007022895A3 WO2007022895A3 (fr) 2007-05-31

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160061793A1 (en) * 2013-04-16 2016-03-03 Dräger Safety AG & Co. KGaA Measuring device, reaction carrier and measuring method
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CN111474130A (zh) * 2020-05-29 2020-07-31 南昌航空大学 一种基于光谱法在线检测气态丙醛、丙烯醛的简便装置及方法

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CN111474130A (zh) * 2020-05-29 2020-07-31 南昌航空大学 一种基于光谱法在线检测气态丙醛、丙烯醛的简便装置及方法

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