WO2011050932A1 - Appareil de mesure servant à la mesure, dans un gaz d'échappement, de concentrations en masse de particules dans un gaz à mesurer, en particulier dans un gaz d'échappement de combustion - Google Patents

Appareil de mesure servant à la mesure, dans un gaz d'échappement, de concentrations en masse de particules dans un gaz à mesurer, en particulier dans un gaz d'échappement de combustion Download PDF

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Publication number
WO2011050932A1
WO2011050932A1 PCT/EP2010/006477 EP2010006477W WO2011050932A1 WO 2011050932 A1 WO2011050932 A1 WO 2011050932A1 EP 2010006477 W EP2010006477 W EP 2010006477W WO 2011050932 A1 WO2011050932 A1 WO 2011050932A1
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WIPO (PCT)
Prior art keywords
light beam
particle
wavelength
light
measuring device
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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.)
Ceased
Application number
PCT/EP2010/006477
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German (de)
English (en)
Inventor
Jens Dambietz
Elmar Tschinkel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maha Maschinenbau Haldenwang GmbH and Co KG
Maha GmbH and Co KG
Original Assignee
Maha Maschinenbau Haldenwang GmbH and Co KG
Maha GmbH and Co KG
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Application filed by Maha Maschinenbau Haldenwang GmbH and Co KG, Maha GmbH and Co KG filed Critical Maha Maschinenbau Haldenwang GmbH and Co KG
Publication of WO2011050932A1 publication Critical patent/WO2011050932A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/02—Investigating particle size or size distribution
    • G01N15/0205—Investigating particle size or size distribution by optical means
    • G01N15/0211—Investigating a scatter or diffraction pattern
    • 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
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N2021/4704—Angular selective
    • G01N2021/4726—Detecting scatter at 90°
    • 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
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N2021/4733—Discriminating different types of scatterers

Definitions

  • the invention relates to a measuring device for the determination of exhaust gas components in a particle collectively a measuring gas, in particular a combustion exhaust gas to selectively determine the mass concentration of different types of particles with a compact exhaust gas meter.
  • Measuring devices for measuring the exhaust gas of motor vehicles are used for testing and diagnosis of vehicle exhaust gases.
  • Exhaust gas measuring devices for determining the exhaust gas mass concentration for motor vehicles which are based on a scattered light method, are known from the prior art.
  • the mass concentration of a particle collective is derived from the intensity of a scattered at a particle collective laser beam.
  • the scattered light signal also depends on the particle type in a measurement on a particle collective in addition to the particle mass concentration. Characteristics for determining the mass concentration are generally recorded for a specific particle type, for example for soot particles in diesel vehicles. If several types of particles are present in an exhaust gas, the mass concentration can only be determined separately for the entire particle collective, but not reliably for the individual particle types, using the laser scattering light method known from the relevant art.
  • DE 202008014667 A1 discloses a measuring device for determining the mass concentration of a particle collective, which determines a change of the particle size distribution by means of a light source and two light detectors for determining the intensity of the light scattered on the exhaust particles, wherein a first detector detects a sidewardly scattered portion of the light beam and a second Detector detects a forward scattered portion of the light beam.
  • the measuring device makes use of the knowledge that the angular dependence of the scattering amplitude of the scattered light beam also depends on the particle size distribution.
  • this angular dependence is approximately determinable, and it can be derived from this a rating by which a characteristic for mass concentration determination of Parti kelkollektivs can be adjusted accordingly.
  • the method disclosed in DE 202008014667 U1 has the disadvantage that in the case of particle collectives containing several different particle types, such as e.g. Soot. Ash, salts, etc., the exhaust gas mass concentration is determined collectively only for the particle collectively, but not individually reliable for each particle type.
  • the increasingly stringent emissions regulations and knowledge regarding the health risks of exhaust particulates require accurate measurement of the mass concentration of the various exhaust constituents.
  • the invention is therefore based on the object with a compact meter, the mass concentration seiektiv for the present in an exhaust jet different Partie species seiektiv and high accuracy.
  • the measuring device for determining the particle mass concentration in a measurement gas, in particular a combustion exhaust gas, an at least partially transparent gas channel for receiving the sample gas, a first radiation source for generating a first light beam and a second radiation source for generating a second light beam, wherein the light beams pass through the sample gas channel and the wavelength of the first light beam from the wavelength of the second light beam is different.
  • the radiation sources for generating light beams are preferably laser devices.
  • Light beam in the sense of this invention is an electromagnetic beam.
  • the wavelengths of the light rays are determined on the basis of the size of the types of particles to be determined and can also lie in the area invisible to humans.
  • the measuring device further comprises a detection means, which is arranged in at least a predetermined scattering angle to the beam direction of the first light beam and a predetermined scattering angle to the beam direction of the second light beam for determining the scattered when traversing the Meßgaskananal portions of the first and second light beams, and a computing unit for determining the Mass concentration of the particles in the measuring gas located in the sample gas from the specific proportions of the scattered light rays.
  • the detection means is an optical receiver for measuring the intensity of each of the particles scattered on the particles.
  • the detection means is preferably designed as a detector which can select and evaluate at least two light beams of different wavelengths.
  • the detection means may also be designed as two or more detectors.
  • the scattered light measurement according to the invention with at least two different wavelengths thus makes it possible to determine the mass concentration of at least two different types of particles contained in a measuring gas, by storing at least a first and a second characteristic in a storage means, which determines the dependence of the mass concentration of a first and a second particle type in the represented in the sample gas channel measuring gas of the specific proportion of scattered light.
  • the mass concentration of the first and the second particle type can then be determined.
  • the invention makes use of the knowledge that the scattered light beam of the first radiation source detected by the detection means is composed of scattered light scattered by the first and second particle types, and the scattered light beam of the second radiation source detected by the detection means is of scattered light , which was also scattered at the first and the second particle type composed.
  • the dependence of the measured scattering intensity of each type of particle is known by means of a characteristic per particle type, the characteristic setting the measured scattering intensity in a functional relationship to the particle mass concentration of a particle type.
  • the use according to the invention of at least two light beams with different wavelengths results in two intensity measurement values which are functionally determined by the stored particle characteristics of the two particle types via the stored characteristic curves.
  • a computing means then allows dissolution according to the particle mass concentration to be determined for each particle type.
  • the measuring device determines two intensity measured values of the scattered light of different wavelengths for solving a system of equations with the two unknown mass concentration values by means of at least one mathematical operation. It is assumed that the species to be measured are known, so that their characteristic can be stored in the meter.
  • the mass concentration value of soot particles and the mass concentration value of ash in a combustion gas can be reliably quasi-simultaneously selectively determined in a compact meter.
  • the prerequisite for this is that the respective characteristic curves for ash and soot are stored in the measuring device.
  • An arrangement of the first and the second radiation source is particularly advantageous such that the first light beam and the second light beam strike the measurement gas at the same location in the sample gas channel.
  • the speed and temperature of the flowing through the sample gas combustion gas is subject Fluctuations depending on the position in the sample gas channel, which lead to parasitic effects in the measured scattering intensity, if the first and the second light beam are scattered at particle collectives with different velocity and temperature distributions.
  • the scattering angle between the beam direction and the detection means i. the angle between the beam axis of the unscattered beam and the beam axis of the scattered beam detected by the detection means is between 60 ° and 120 °. It is particularly advantageous if the scattering angle of the first light beam is 90 ° and the scattering angle of the second light beam differs by an amount of 5 ° to 30 ° from the scattering angle of the first light beam.
  • the sideways scattered portions of the light rays are detected, which have a low dependence on the particle size and thus allow accurate measurement of the particle mass concentration even with variations in the particle size.
  • the detection means comprises only one detector for detecting the scattered components of both the first and the second light beam, wherein the first and the second light source are arranged such that the scattering angle between the first light beam and the detector of the scattering angle between the second light beam and the detector is different.
  • the query of the intensity of the first and the second wavelength can be carried out in chronological succession.
  • the wavelength of the first light source is preferably set such that, for a first particle type of the measurement gas, a wavelength of the first light beam of the first light source is set such that the proportion of the first light beam scattered at the first particle type has a maximum for this wavelength. In other words, the wavelength is tuned to the mean effective diameter of the particle type.
  • the light scattering on a gas particle depends essentially on the particle size, the optical properties of the particles, eg surface structure, and the wavelength of the light.
  • the particle size and the optical scattering properties of these particles are given by the cross-section or the scattering cross-section.
  • the effective diameter or the equivalent diameter ie the effective diameter of balls of the same size.
  • the effective diameter for a particle type, eg diesel soot particles is approximately normalverteil, with a mean effective diameter.
  • the wavelength of the first light beam is selected so that a maximum scattering signal is measured for this wavelength.
  • the first predetermined particle type then generates a maximum scattering signal for this wavelength, and particles with smaller deviations from the mean effective diameter produce only very small fluctuations in the measured scattering intensities.
  • another second particle type with different particle size for this wavelength produces a weaker scatter signal.
  • the predetermined wavelength of a light source for a particular type of particle is determined by a maximum of the number concentration of a particle size distribution of the particle type. For example, the average scattering cross-section and thus the maximum value of the number concentration of the effective diameter normal distribution of diesel soot is 120 nm.
  • a wavelength of the second light beam of the second light source is set so that the proportion of the second light beam scattered at the second particle type has a maximum for this wavelength.
  • the second predetermined particle type then generates a maximum scattering signal for this second wavelength, and particles with larger deviations from the mean effective diameter produce only very small fluctuations in the measured scattering intensities
  • the first radiation source and the second radiation source are preferably arranged next to one another at the same location outside the sample gas channel.
  • only one light-transmitting point of the wall of the measuring gas channel is required for both light beams of the first and second radiation source.
  • Compared to a spatially separated arrangement of the first and second radiation source also less disturbing backscatter effects occur. This arrangement further enables a particularly compact construction of the measuring device.
  • the measuring device preferably comprises at least a third light source, wherein the wavelength of the light beam of the third light source is different from the wavelength of the first and second light beam, wherein the detection means comprises a second detector for detecting the scattered components of the and wherein a wavelength of the third light source is set so that the determined scattered portion of the third light beam has a maximum for the predetermined wavelength of the third light source, and wherein in a storage means, a third characteristic is stored, which determines the dependence of the mass concentration represents a present in the measurement gas third particle of the specific proportion of the third light beam.
  • the measuring device is arranged to determine the mass concentration of the particle types soot, ash and / or salt, wherein a first wavelength to the value AI in the range of 640-670 nm, a second wavelength to the value A2 in the range of 520-550 nm and a third wavelength is set to the value of A3 in the range of 400-440 nm.
  • a measuring device set up in this way the three most common exhaust particles can be measured with a measuring device virtually simultaneously in real time.
  • the wavelengths ⁇ , A2, and A3 are determined experimentally on the basis of the particle types to be investigated.
  • the light beam of the third light source is scattered at a location in the sample gas channel which is spatially separated in the flow direction by a decoupling diaphragm from the location in the sample gas channel at which the first and the second light beam are scattered.
  • a decoupling diaphragm from the location in the sample gas channel at which the first and the second light beam are scattered.
  • advantageously light traps may be provided for receiving the unscattered portions of the light beams in order to avoid a falsification of the measurement results.
  • the present invention enables a cost-effective and compact measuring device for the selective and highly accurate determination of the mass concentration of different types of particulates of exhaust components of a combustion exhaust gas.
  • the inventive use and arrangement of at least two light beams, each with a tuned to the particle types to be examined wavelength allows the quasi-simultaneous determination of the mass concentration for the particle types to be examined And due to its compact design, it also meets the high mobility requirements of workshop use.
  • FIG. 1A schematically shows a structure of a measuring device according to the invention according to an embodiment of the present invention
  • Fig. 1B schematically shows a construction of a measuring apparatus according to an embodiment of the present invention
  • FIGS. 2A and 2B schematically illustrate the distribution of the number of concentrations of the particles of a particle type as a function of the effective cross section of the particles;
  • Fig. 3 schematically illustrates characteristics of the scattering intensity in relation to the mass concentration of particles for two different types of particles
  • FIG. 4 schematically illustrates the determination of the particle mass concentration for three different particle types by means of a measuring device in accordance with FIG. 4
  • Figs. 5A, 5B and 5C schematically illustrate the determination of
  • FIG. 1A schematically shows a construction of a measuring device 100 according to an embodiment of the present invention.
  • the measuring device 100 is designed to determine the exhaust gas constituents in a particle collective of a measuring gas, in particular for determining the mass concentration of a plurality of particle types of a combustion exhaust gas 1.
  • this sample gas 1 is a combustion exhaust gas, which is supplied to the measuring device 100 in a sample gas channel 15 and discharged after performing measurement again.
  • the measuring gas channel 15 is thus designed to receive the measuring gas 100.
  • the measuring device comprises a first laser 2 for generating a first light beam 4 and a second laser 3 for generating a second light beam 5.
  • the first laser 2 and the second laser 3 are arranged side by side in parallel alignment, so that their light beams 4 and 5 of the Exhaust particles are scattered in the sample gas in the same place.
  • the measuring device further comprises a third laser 11 for generating a third light beam 12.
  • the third laser 11 is arranged next to the first and second lasers 2, 3, but the beam axis of the third laser is approximately 70 ° from the beam axis of the first laser 2 is rotated so that the beam 12 of the third laser is scattered at a position in the measurement channel 15, which is different from the location in the sample gas channel at which the first and the second light beam are scattered, and spatially in the flow direction through a decoupling diaphragm 10 for reducing Scattering effects is separated.
  • the wall of the sample gas channel 15 is transparent in several areas.
  • the light beams 4, 5, 12 generated in the lasers 2, 3, 11 can traverse the sample gas channel 15.
  • the wavelengths of the three light beams are different from each other, with the wavelength of the first beam 4 set at 658 nm, the wavelength of the second beam 5 at 532 nm and the wavelength of the third beam at 420 nm.
  • a first detector 8 On the opposite side to the lasers 2 and 3 at the outlet of the light beam from the sample gas channel 15, a first detector 8 is arranged, with which a scattered in a first scattering angle 9a to the beam direction 4 and a second scattering angle 9b after traversing the Meßgaskanals 15 Proportion of the light beams 4 and 5 can be determined.
  • the optical receiver 8 is constructed to have at least two light sources different wavelength can select and evaluate. The query of the intensity of different wavelengths takes place sequentially in time.
  • the scattering angle 9a between the beam direction 4 and the detector 8 is 90 °
  • the scattering angle 9b between the beam direction 5 and the detector 8 is 100 °
  • the representation is not to scale.
  • a third detector 11 is arranged downstream on the same side of the measuring gas channel 15 as the laser 11 for measuring the scattered light of the beam 12.
  • the scattering angle 9c between the beam direction 4 and the detector 8 is 90 °.
  • the detectors 8 and 13 are designed such that the intensities can be determined for the portions of the light beams 4, 5 and 12 scattered in the scattering angles 9a, 9b, 9c. If the measuring gas 1 contains three different types of particles, such as soot, ash and salt, then the detectors 8 detect a portion of the light beams 4 and 5 scattered by these three particle types. Detectors 13 also detect a portion of the light beam 12 scattered by these three particle types.
  • the optical detectors 8 and 13 are constructed so that a cross-sensitivity of the light beams of different wavelengths and thus falsification of the measurement results is prevented.
  • 15 light traps 6 are arranged in the axis of the light beams 4, 5, 12 behind the sample gas channel. The light traps 6 receive the unscattered light beams 4, 5, 12.
  • an evaluation algorithm is set up with which the mass concentration for each of the three types of particles in the sample gas 1 in the sample gas channel 15 can be calculated from the determined proportion of the scattered light beams.
  • the arithmetic unit is set up so that the determined intensities with a mathematical Operation for calculating the masses Concentration of the particles soot, ash and salt can be linked in the sample gas 1 located in the sample gas channel 15.
  • FIG. 1B shows a further exemplary embodiment which, in contrast to the measuring device previously described, has only two laser light sources.
  • FIGS. 2A and 2B schematically illustrate the distribution of the number concentration of the particles of a particle type as a function of the effective cross section of the particles.
  • the scattered light signal depends on a measurement on a particle collective in addition to the wavelength of the light beam substantially on the particle size distribution, the number of particles and the optical properties of the particles. For a particular type of particle, the particle size and the optical scattering properties of these particles are given over the cross section and the scattering cross section.
  • the effective diameter or equivalent diameter i. the effective diameter of equal-sized balls used.
  • the effective diameter for a particle type, e.g. Diesel soot particle is approximately normaiverteii around an average effective diameter, which represents the maximum of the number concentration of the particles with a certain effective diameter.
  • FIG. 2A schematically shows the normal distribution 20 of the number of diesel soot particles with a specific effective diameter 0.
  • the average effective diameter for diesel soot particles is approximately 120 nm.
  • FIG. 2B different particle types with a different particle size and particle surface have different normal distributions shifted relative to each other 21, 22, 23, each with different effective diameters.
  • For each medium particle diameter particle type there is a corresponding wavelength at which the light scattered by these particles becomes maximum. For each particle type, this wavelength can be experimentally determined by test measurements on a test combustion gas containing only this type of particle.
  • the wavelength thus determined generates a maximum scattering signal for the respective particle type and particles whose effective diameters of the average effective diameter produce only very small fluctuations of the measured scattering intensities.
  • another second particle type with different particle size for this wavelength produces a weaker scatter signal.
  • the wavelengths and the power of the laser are each tuned to a particle type.
  • the wavelength of the laser 2 becomes, for example, the maximum A of the number particle number of the first particle type illustrated in FIG. 2B, the wavelength of the laser 3 to the maximum B of the number concentration of the second particle type, and the wavelength of the laser 11 is tuned to the maximum C of the number concentration of the third particle type.
  • the wavelengths 658 nm, 532 nm and 420 nm were determined experimentally.
  • Commercial lasers with a defined wavelength are available for almost any wavelength. Alternatively, a laser is used whose wavelength is closest to the ideal wavelength for a particle type.
  • FIG. 3 schematically illustrates characteristics of the scattering intensity in relation to the particle mass concentration for three different particle types.
  • the first characteristic curve 31 shown in FIG. 3 represents the dependence of the mass concentration of a first particle type A on that with one of the detectors 8, 13 certain intensity.
  • a measured value IIA corresponds to the particle mass concentration PMIA of this particle type if the sample gas contains only this particle type.
  • IIA the Streu portion of the beam 4, which was scattered at the particles A.
  • the illustrated characteristic curves 32 and 33 represent the dependence of the mass concentration of a second or third particle type.
  • the values removed on the abscissa in FIG. 3 thus correspond to the output signals of the detectors 8, 13.
  • the characteristic curves 31, 32, 33 are stored in a storage means (not shown) of the measuring device.
  • the following method for determining the particle mass concentration for three different particle types A, B, C can now be carried out, which is illustrated schematically in FIG. 4 for an exemplary embodiment of the present invention.
  • the intensity Ii of the scattered light of the light beam 4 is measured with the detector 8.
  • the wavelength of the light beam 4 is based on the mean effective diameter of the first particle type A, e.g. Soot, tuned.
  • IIA denotes the Streuanteil of the beam 4, which was scattered at the particles A.
  • a step S20 the intensity of the scattered light of the light beam 5 is measured with the detector 8.
  • the wavelength of the light beam 5 is matched to the mean effective diameter of the second particle type B, eg ash.
  • the detector 8 is arranged so that the interrogation of the intensity of the first and the second Wavelength occurs in quick succession.
  • the intensity I3 of the scattered light of the light beam 12 is measured with the detector 13.
  • the functional relationship between the measured scattering intensities and the particle mass concentrations is known, ie the measured intensities can be expressed by:
  • PMA, PM b , and PMc represent the desired particle mass concentration for the particle types A, B, and C and the functions fiA indicates, for example, the functional relationship between measured scattered light intensity IIA and the particle mass concentration of Partique A, which is stored in the form of a characteristic in the measuring device ,
  • the mean effective diameter of the particle types is assumed to be constant.
  • the fluctuation of the scattering intensity due to fluctuations in the particle size distribution is negligible.
  • step S40 the system of equations consisting of the formulas (1) + (3) for determining the mass concentration of particles is then created. This results in a system of equations with 3 equations, 3 unknown mass concentrations PMA, PMB, and PMc, and the three measured intensities II, 12 and 13, which is thereby completely determined and by means of the arithmetic unit in step S50 for the three unknowns PMA, PMB, and PMc is solved.
  • the measuring device according to the invention with at least two laser beams of different wavelengths can also be used to determine the mass concentration and the mean effective diameter of a particle type.
  • FIGS. 5A, 5B and 5C schematically illustrate, according to a further exemplary embodiment of the invention, the determination of the particle mass concentration and the effective diameter for a combustion gas with only one particle type by means of a measuring device.
  • the number concentration of a particle type is normally distributed around an average effective diameter, eg, 120 nm for diesel soot particles.
  • the light scattering at Abgaspartikein is at constant Teiichen Why, ie constant particle mass concentration, influenced both by the particle effective diameter and by the wavelength of the light.
  • FIG. 5A schematically illustrates the dependence of the scattering intensity on the effective diameter for two different wavelengths at a defined particle mass concentration.
  • the mean effective diameters for a known type of particle vary within a narrow range 28 around the mean effective diameter.
  • the wavelength of the first light beam is selected such that it is tuned to the typical mean effective diameter of a particle type, ie, that for this wavelength the proportion of the first light beam scattered by the first particle type has a maximum, then the measured intensity distribution 24 of FIG Scattered light depending on the particle effective diameter.
  • the measured Scattering intensity 25 is approximately independent of fluctuations in the mean effective diameter in the region 28.
  • the wavelength of which does not correspond to the effective cross section at the maximum of the number concentration of the particle results in the intensity distribution 26, which in the region 27 depending on variations in Effective diameter is in the range 28.
  • the first predetermined particle type then generates a maximum scattering signal for the wavelength of the first light beam, and fluctuations in the particle size of the first particle type produce small fluctuations in the measured scattering intensities.
  • a light beam with a different wavelength produces a weaker scatter signal for this type of particle.
  • the first characteristic curve 50 shown in FIG. 5B represents the dependence of the measured intensity of the scattered light of the first light beam 4 with the first wavelength on the mass concentration of a predetermined particle type contained in a measurement gas 1. Since the first wavelength, as illustrated in FIG. 5A, is set so that the measured intensity II is independent of variations in the effective diameter in the region 28, the particle mass concentration PM1 can be determined from the measured intensity value II.
  • the particle mass concentration PM1 results from the measured scattered intensity value II and the characteristic curve.
  • the second characteristic 51 represents the dependence of the measured intensity of the scattered light of the second light beam 4 with the second wavelength on the mass concentration of a predetermined particle type contained in a measurement gas 1.
  • the curve is drawn by dashed lines, since the curve is additionally dependent on the parameter of the effective diameter 0, as can be seen from curve 26 in FIG. 5A.
  • the measured intensity scattering value 12 is therefore in a functional relationship f2 (PM, 0) with the particle mass concentration and the effective diameter.
  • the steps for determining the particle mass concentration and the effective diameter are illustrated schematically in FIG. 5C.
  • the intensity II is first determined in step S60, then the intensity in step S70. II and 12 are measured via the optical receiver 8, which is designed so that it can select and evaluate at least two light sources of different wavelengths. The interrogation of the intensity of different wavelengths takes place in quick succession.
  • the particle mass concentration PM for the measurement gas can be determined in step S80, since the measured value in region 28 is independent of fluctuations in the effective diameter.
  • 12 is in a functional relationship f2 (PM, 0) to the particle mass concentration and the effective diameter 0.
  • the mean effective diameter 0 is determined by means of at least one mathematical operation by the arithmetic unit in step S90.
  • the individual features of the invention are not limited to the described combinations of features in the context of the presented embodiments and can also be used in other combinations depending on predetermined device parameters.
  • mass concentrations of n particle types can be used for a measuring device according to the invention which is set up for the use of n different wavelengths.
  • mass concentration of n particle types and m effective diameters to be determined of these n particle types an inventive measuring device can be used that is set up for the use of (n + m) wavelengths.

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Abstract

L'invention concerne un appareil de mesure pour la détermination de composants de gaz d'échappement dans un système collecteur de particules d'un gaz à mesurer, en particulier pour la détermination de la concentration en masse de plusieurs types de particules d'un gaz d'échappement de combustion. L'appareil de mesure (100) selon l'invention comprend un conduit de gaz à mesurer, au moins partiellement transparent (15) pour la réception du gaz à mesurer (1), une première source de rayonnement (2), pour la production d'un premier faisceau lumineux (4), et une seconde source de rayonnement (3), pour la production d'un second faisceau lumineux (5), les faisceaux lumineux (4, 5) traversant le conduit de gaz à mesurer, et la longueur d'onde du premier faisceau lumineux (2) étant différente de la longueur d'onde du second faisceau lumineux (3). L'appareil de mesure (100) comprend en outre un moyen de détection qui est disposé dans au moins un angle de diffusion prédéterminé, par rapport à la direction des faisceaux lumineux, pour la détermination des fractions diffusées lors de la traversée du conduit de gaz à mesurer (15), du premier et du second faisceaux, et une unité de calcul, pour la détermination, à partir des fractions déterminées des faisceaux lumineux diffusées, de la concentration en masse des particules dans le gaz à mesurer se trouvant dans le conduit de gaz à mesurer.
PCT/EP2010/006477 2009-11-02 2010-10-22 Appareil de mesure servant à la mesure, dans un gaz d'échappement, de concentrations en masse de particules dans un gaz à mesurer, en particulier dans un gaz d'échappement de combustion Ceased WO2011050932A1 (fr)

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DE200910046279 DE102009046279A1 (de) 2009-11-02 2009-11-02 Messgerät zur Abgasmessung
DE102009046279.1 2009-11-02

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WO2011050932A1 true WO2011050932A1 (fr) 2011-05-05

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018095719A1 (fr) * 2016-11-25 2018-05-31 Robert Bosch Gmbh Dispositif de mesure de particules et procédé pour déterminer une grandeur de particules
DE102020111551B4 (de) 2019-06-03 2024-05-08 Deutsches Zentrum für Luft- und Raumfahrt e.V. Verfahren und System zum Bestimmen einer Massenkonzentration mindestens eines Stoffes in einem Aerosolstrom

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013186078A1 (fr) * 2012-06-11 2013-12-19 Siemens Aktiengesellschaft Détection de particules et détermination de la masse de particules, basées sur la lumière
CH711170A1 (de) * 2015-06-08 2016-12-15 Fachhochschule Nordwestschweiz Fhnw Verfahren und Vorrichtung zur Detektion von Aerosolpartikeln.
CN112903547B (zh) * 2019-11-19 2023-01-03 南京理工大学 基于双光源的高浓度云雾颗粒浓度测量装置
CN114324092B (zh) * 2021-12-27 2024-04-05 安徽庆宇光电科技有限公司 一种机动车尾气不透光烟度在线遥感监测系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999037383A1 (fr) * 1998-01-26 1999-07-29 Mie Corporation Systeme et procede de surveillance de particules en suspension dans l'air
WO2004009390A2 (fr) * 2002-07-19 2004-01-29 Board Of Regents, The University Of Texas System Capteur d'emissions d'echappement a resolution temporelle
DE202008014667U1 (de) 2008-11-05 2009-01-15 Testo Ag Messgerät

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999037383A1 (fr) * 1998-01-26 1999-07-29 Mie Corporation Systeme et procede de surveillance de particules en suspension dans l'air
WO2004009390A2 (fr) * 2002-07-19 2004-01-29 Board Of Regents, The University Of Texas System Capteur d'emissions d'echappement a resolution temporelle
DE202008014667U1 (de) 2008-11-05 2009-01-15 Testo Ag Messgerät

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018095719A1 (fr) * 2016-11-25 2018-05-31 Robert Bosch Gmbh Dispositif de mesure de particules et procédé pour déterminer une grandeur de particules
DE102020111551B4 (de) 2019-06-03 2024-05-08 Deutsches Zentrum für Luft- und Raumfahrt e.V. Verfahren und System zum Bestimmen einer Massenkonzentration mindestens eines Stoffes in einem Aerosolstrom

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