WO2020038658A1 - Système de mesure de particule pourvu d'un dispositif de dilution et procédé pour la mesure de particules - Google Patents

Système de mesure de particule pourvu d'un dispositif de dilution et procédé pour la mesure de particules Download PDF

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Publication number
WO2020038658A1
WO2020038658A1 PCT/EP2019/068957 EP2019068957W WO2020038658A1 WO 2020038658 A1 WO2020038658 A1 WO 2020038658A1 EP 2019068957 W EP2019068957 W EP 2019068957W WO 2020038658 A1 WO2020038658 A1 WO 2020038658A1
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WO
WIPO (PCT)
Prior art keywords
flow
dilution
volume flow
aerosol
particle
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PCT/EP2019/068957
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German (de)
English (en)
Inventor
Thomas Maier
Original Assignee
Horiba Europe Gmbh
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Publication of WO2020038658A1 publication Critical patent/WO2020038658A1/fr

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Classifications

    • 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
    • G01N1/2247—Sampling from a flowing stream of gas
    • G01N1/2252—Sampling from a flowing stream of gas in a vehicle exhaust
    • 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
    • G01N15/06—Investigating concentration of particle suspensions
    • G01N15/065—Investigating concentration of particle suspensions using condensation nuclei counters
    • 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
    • G01N1/2247—Sampling from a flowing stream of gas
    • G01N1/2252—Sampling from a flowing stream of gas in a vehicle exhaust
    • G01N2001/2255—Sampling from a flowing stream of gas in a vehicle exhaust with dilution of the sample
    • 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
    • G01N2015/0042—Investigating dispersion of solids
    • G01N2015/0046—Investigating dispersion of solids in gas, e.g. smoke

Definitions

  • the invention relates to a particle measurement system for measuring a number of particles in an aerosol stream, for example in the exhaust gas stream from an internal combustion engine.
  • Corresponding particle measuring devices are known for detecting and in particular counting the particles, which are used in test stands or measuring systems equipped for this purpose.
  • the raw gas containing aerosol cannot be supplied undiluted to the respective measuring devices or sensors. Rather, it is necessary to dilute the raw gas (e.g. the exhaust gas from an internal combustion engine) in a suitable manner in such a way that the particles contained in the diluted aerosol stream can be detected in accordance with the measuring range of the respective measuring device.
  • the raw gas e.g. the exhaust gas from an internal combustion engine
  • dilution air is supplied to the aerosol stream in order to achieve the desired dilution. It is necessary that the dilution air is of sufficient quality. In particular, the dilution air itself must not introduce any particles or substances that could falsify the measurement result. However, additional factors that can negatively influence the overall accuracy of the system can be introduced via external dilution air supplied from the ambient air.
  • the invention has for its object to provide a particle measurement system in which the negative effects existing by introducing external dilution air can be minimized or completely eliminated.
  • the object is achieved according to claim 1 by a particle measurement system for measuring a number of particles in an aerosol stream.
  • a method according to the invention for measuring a number of particles in an aerosol stream is specified in a subordinate claim.
  • Advantageous configurations are defined in the dependent claims.
  • a particle measurement system for measuring a number of particles in an aerosol flow has an inlet for introducing an aerosol flow, at least one dilution device arranged downstream of the inlet, at least one particle measurement device arranged downstream of the dilution device for measuring the number of particles, a conveyor device arranged downstream of the particle measurement device for conveying one of the aerosol flow have the delivery volume flow, a processing device for processing the delivery volume flow, a dividing area for dividing the processed delivery volume flow into at least one return volume flow and an outlet volume flow, and a gas sink for rejecting the outlet volume flow, the return volume flow being returned as a dilution gas flow the dilution device is feasible.
  • a bypass device for guiding a partial aerosol flow can optionally be provided parallel to the particle measuring device, as will be explained later.
  • the specified dilution air flow results in significant advantages in terms of significant improvements in system accuracy (dilution accuracy) by utilizing mass conservation and consequently strong reductions in the number of flow (measurement) variables and their influencing factors, which must be known in conventional particle measurement systems. to determine corresponding dilution rates from the conditions of these rivers.
  • dilution accuracy system accuracy
  • measurement measurement variables and their influencing factors
  • the aerosol stream can thus be a sample volume flow (particle sample, exhaust gas sample) from a raw gas stream (for example in the exhaust gas stream of a combustion engine). tors) are branched off.
  • the aim here is to ensure that the sample volume flow or aerosol flow can be supplied as constantly as possible, that is, if possible, it is not subject to pressure fluctuations.
  • further components for pressure decoupling can be provided between the raw gas flow and the particle measurement system.
  • the particle measuring device can be a sensor (e.g. a CPC sensor - condensation particle counter) for measuring the number of particles in the volume flow passed through the measuring device.
  • a sensor e.g. a CPC sensor - condensation particle counter
  • the functionality of a CPC is based on a defined evaporation of a working medium (e.g. butanol, isopropanol) in the aerosol stream, whereupon a defined supersaturation is reached during a subsequent cooling, which leads to condensation of the working medium on the particles and a subsequent possible optical detection of the leads through the condensed working medium enlarged particles.
  • a working medium e.g. butanol, isopropanol
  • the aerosol stream provided with the working medium is normally discarded in prior art systems after the particles have been detected. According to the invention, however, this is not the case: here the aerosol flow is maintained and recycled in a suitable manner (circuit), as will also be explained in more detail on this page.
  • the conveying device can be designed as a pump, for example as a rotary vane pump or membrane pump, and "sucks" the aerosol flow from the inlet through the dilution device and the particle measuring device.
  • the resulting volume flow consists in particular of the aerosol flow and the return volume flow supplied as a dilution gas flow (or the multiple return volume flows if a plurality of dilution devices are provided accordingly).
  • the dilution device can use the return volume flow serving as dilution gas flow (for example dilution air) to dilute the aerosol flow.
  • the pump (s) as well as the entire particle measurement system should be designed as close as possible to the atmosphere in order not to disturb the use of mass conservation.
  • the diaphragm pump is particularly suitable for this, since other pump types often have a design-related leak in the area of the drive shaft, which impairs a complete seal against the atmosphere.
  • the particle measurement system it is possible to completely dispense with external dilution air, for example from the environment. Instead, the diluted aerosol stream is processed (filtration, separation of water and unwanted components such as organic compounds, etc., see below) after it has passed the existing sensors (particle measuring device) or the optional bypass, so that it can be used as a dilution gas (as der-).
  • sample inlet sample inlet
  • sample inlet sample inlet
  • the aerosol throughput per time can be regulated by regulating the gas flow in the present system at the location of the outlet or the gas sink.
  • the processing device can have at least one of the following system components: at least one separating device for separating unwanted gas components from the delivery volume flow, a cooling device or condensing device, a filter device, and / or a buffer device for buffering pressure fluctuations.
  • the processing device allows a kind of "flow reconditioning". With the help of the separation device, it is possible to remove unwanted components such as water, working medium of the CPC (butanol, isopropanol), etc., as well as volatile exhaust gas components from the delivery volume flow and to restore the quality of the gas flow necessary for dilution.
  • the cooling device or the condensation device can be used to condense out corresponding undesired components.
  • particles can be removed from the delivery volume flow by the filter device. It is also possible to separate gas components by absorption and / or adsorption etc. (for example on activated carbon, silica, etc.).
  • the separation of the unwanted components is advantageous in the sense of producing the purest possible dilution air flow in order to avoid undesired effects in the dilution devices or the particle measurement devices (particle sensors).
  • circuit thinner chosen for the particle measurement system is based on the joint use of the volume flow leaving the (particle) sensor (CPC).
  • this volume flow also contains vaporized constituents of the (CPC) working medium, which, due to the basic mode of action of the CPC, is particularly suitable for the formation of particles or layers on particles by condensation. Residues of this working medium are therefore fundamentally disadvantageous, since they can contribute to the undesired formation of particles and thus to excessive measurement artifacts.
  • the volume flow leaving the CPC (the particle measurement device) is therefore always discarded.
  • the volume flow leaving the CPC (optionally partially mixed with the bypass volume flow, if a bypass is present) can now be used again by the selected provision of the preparation device, which further increases the accuracy through mass maintenance in the circuit including this sensor and in the circuit sor volume flow independent adjustment of the sample volume flow is made possible by the outlet volume flow.
  • the working medium is largely separated by condensation in the processing device, which leads to the additional advantage that the volume flow leaving the particle measuring system is largely free of vapors from the working medium (in contrast to known measuring systems).
  • the buffer device for buffering pressure fluctuations can optionally be provided in order to achieve pressure equalization in the circuit which increases the measurement quality.
  • the gas sink can have: a flow control device for regulating the outlet volume flow and an outlet for rejecting the regulated outlet volume flow.
  • the flow control device can have, for example, a flow measuring device (mass flow meter MFM) and a flow control device.
  • a controllable proportional valve or a CFO ("Critical Flow Orifice") is suitable as a flow control device.
  • the volume of the particle sample taken from the exhaust gas flow, which enters the system via the inlet, can be determined and determined directly and precisely.
  • the aerosol flow into the particle measurement system (and thus the amount of particles through the particle measurement system) to be controlled exclusively via the flow control device in the gas sink. In this way, the particle concentration of an aerosol can be determined independently of the selected dilutions.
  • An additional reference flow measuring device can be provided for the flow measuring device in the gas sink, for calibrating the flow measuring device to this reference flow measuring device.
  • the reference flow measuring device can, if necessary, be arranged in series with the flow measuring device provided in the gas sink. Since - as shown above - the flow measuring device in the gas sink is solely decisive for how large the aerosol flow is at the inlet, the accuracy of this flow measuring device is decisive for the measuring accuracy in the entire system. The accuracy can be increased further by providing the reference flow measuring device.
  • the reference flow measuring device can also be placed inside or outside of the circuit flow, at a point outside the gas paths through which the measuring operation flows (e.g. in a bypass in the system or also externally), in order to avoid possible contamination of the reference flow measuring device by exhaust gas components during the measuring operation , During the calibration, an unpolluted and therefore unchanged reference is always available.
  • the entire error chain can thus be traced back to a single sensor, which can be calibrated externally by the reference flow measuring device.
  • the reference flow measuring device can also be connected in series with other flow measuring devices of the system by using the existing or further switchable gas paths, in order to also compare these with this unchanged reference.
  • a first dilution device and a second dilution device can be provided, the first dilution device being able to be supplied with a first return volume flow as the dilution gas flow and the second dilution device being able to be supplied with a second return volume flow as the dilution gas flow.
  • the first dilution device being able to be supplied with a first return volume flow as the dilution gas flow
  • the second dilution device being able to be supplied with a second return volume flow as the dilution gas flow.
  • a respective return volume flow can be controlled by a respective flow control device.
  • Each flow control device can have a flow measuring device and a suitable flow control element, for example a proportional valve device.
  • An MFC Mass Flow Controller
  • An MFC Mass Flow Controller
  • a flow control device for example MFC - Mass Flow Controller
  • a flow measuring device and a flow control element for example proportional valve
  • a flow control element for example proportional valve
  • the respective flow control devices including flow measurement devices in the individual return volume flows, only define the dilution factor of the associated dilution device.
  • An incorrect setting or incorrect measurement of these return volume flows is absolutely uncritical, since the dilution factors related to the individual dilution devices change, but not the total dilution of the particle measurement system. It only leads to a shift in the dilution proportions between the individual dilution devices - however, as explained, the total dilution is only defined by the accuracy of the outlet volume flow.
  • a pressure control device can be provided for one of the return volume flows.
  • a pressure control using the pressure control device into one of the return volume flows, for example with the aid of throttle valves (or the above-mentioned proportional valves)
  • the pressure levels in the entire area from the delivery device to the respective throttling through the flow control - or pressure control devices in the return volume flows and the outlet volume flow are reproducibly adjustable and constant. All components (eg flow measuring elements) of the present particle measuring system influencing the efficiency or accuracy can thus be exposed to the same and reproducible pressure, which can also be the same as the pressure during the original calibration of the system, regardless of the external conditions. This additionally improves the reproducibility of the flows and also allows pressure control that is independent of the ambient conditions.
  • the constancy of the pressures in the measuring system also increases the accuracy-relevant constancy of the sample volume flow defined by the outlet volume flow, which is only minimal due to these pressure equalization measures is superimposed by pressure equalization flows (which represent an undefined additional sample volume flow / particle flow flowing in or out of the system).
  • a evaporator unit can be provided for evaporating and / or separating volatile components from the aerosol flow.
  • This can be an Evaporati on Tube (ET), a Catalytic Stripper (CS) or another suitable unit.
  • Evaporati on Tube ET
  • CS Catalytic Stripper
  • this particle measurement system with two dilution levels and an intermediate evaporator unit, the treatment of the sample volume flow / aerosol on the way from the measuring device inlet to the sensor (par- particle measuring device) the procedure for emission certification measurements for particle number determination according to the Particulate Measurement Program (PMP) or the regulations derived from it (e.g. ECE-R83, ECE-R49).
  • PMP Particulate Measurement Program
  • ECE-R83, ECE-R49 the regulations derived from it
  • At least one further particle measuring device for measuring the number of particles can be arranged parallel to the particle measuring device.
  • a measuring device (sensor) or several measuring devices can be flowed through in parallel by the aerosol flow in order to carry out the desired measurements.
  • a different sensor type for each particle measuring device in order to carry out targeted measurements or to compare measurements with one another.
  • different particle metrics as well as the particle size distribution and from ratios of two sensors with different size-dependent sensitivity can be determined. Part of the aerosol flow is passed through the corresponding particle measuring device.
  • a bypass can be provided parallel to at least one of the particle measuring devices.
  • the bypass represents an additional branch parallel to the one or the several particle measuring devices and, in particular, enables the gas flow to always be supplemented to the desired total gas flow (through the measuring devices and the bypass), even if different numbers of measuring devices are connected in parallel ,
  • the gas flow through the measuring devices is usually constant and cannot be changed.
  • the gas flow through the bypass can be regulated so that the total gas flow can also be regulated in this way.
  • This bypass also enables improved reproducibility, since the flow in the circuit can thus be set to the desired values independently of other influencing factors.
  • a flow control device with a flow control device arranged in the bypass can be provided for the bypass, for adjusting the gas flow through the bypass.
  • This flow control device thus makes it possible for the gas flow passing through the bypass to be set or regulated in such a way that the desired total gas flow through the system can be achieved.
  • the flow control device of the bypass can have, for example, a proportional valve device as a flow control device.
  • the flow measuring device required for the flow control device does not necessarily have to be provided in the bypass. Rather, it may be expedient to spatially arrange the flow measuring device necessary for the flow control device of the bypass at another point in the system or in the circuit, for example downstream of the conveying device or downstream of the processing device.
  • the flow measuring device can thus also be arranged spatially distant from the bypass.
  • the advantage here is that the flow measuring device then measures the total gas flow (delivery volume flow), i.e. also the gas flows through the particle measuring devices.
  • the flow measuring device measures the total gas flow (delivery volume flow), i.e. also the gas flows through the particle measuring devices.
  • contamination of this flow measuring device and the following flow measuring devices is reduced by the previous processing device.
  • the total gas flow can then be adjusted in the desired manner by regulating the bypass.
  • a method for measuring a particle number in an aerosol stream has the steps:
  • the entering aerosol flow can only be adjusted by regulating the outlet volume flow.
  • a bypass volume flow can be branched off from the diluted aerosol flow before the measurement of the number of particles, which is conducted via a bypass, the bypass volume flow being regulated in order to keep the aerosol flow constant.
  • Fig. 1 shows the schematic structure of a particle measurement system according to the invention.
  • Fig. 1 shows a particle measurement system 1, which can be accommodated, for example, in a temperature-controlled housing or cabinet.
  • the temperature control supports e.g. reproducible, precise measurements e.g. the volume flows on the flowmeters.
  • the particle measurement system 1 has an inlet 2, via which a sample volume flow or aerosol flow 3 can be let into the particle measurement system 1.
  • the inlet 2 is, for example, coupled with the exhaust of an internal combustion engine, from which raw exhaust gas can be removed in this way and fed to the particle measurement system 1 for counting the number of particles contained in the exhaust gas.
  • a pressure decoupling device (not shown) can be arranged, which serves in particular to compensate or even out pressure fluctuations or oscillations originating from the raw exhaust gas source, but also fluctuations in the ambient pressures.
  • the aim is for the aerosol flow 3 to be as constant as possible. In a realized embodiment, the aerosol flow 3 is 50 ml / min at a pressure of 85 kPa.
  • the aerosol stream 3 is fed to a first dilution stage 4 serving as the first dilution device, where the aerosol stream 3 is in a certain ratio (for example 1:10, or adjustable in the range of, for example, 1: 5-1: 200, hereinafter, for example 1 : 10) is diluted.
  • a certain ratio for example 1:10, or adjustable in the range of, for example, 1: 5-1: 200, hereinafter, for example 1 : 10.
  • the first dilution stage 4 is supplied with a dilution gas stream 5, which will be explained in detail later.
  • the dilution gas stream 5 contains in particular dilution air, which is used to thin the aerosol stream 3 in the first dilution stage 4.
  • the diluted aerosol stream 3 is passed through an optional evaporator unit 6, in which volatile components from the aerosol stream 3 can be evaporated and / or separated.
  • An evaporator unit 6 is, for example, an evaporation tube (ET) or a (heated) catalytic stripper (CS) for evaporation and separation.
  • the evaporator unit 6 is not absolutely necessary for the overall function of the particle measurement system 1; it serves in particular to improve the aero sol current 3 and thus to increase the measurement quality.
  • a second dilution stage 7 serving as a second dilution device is provided, which - like the first dilution stage 4 - is supplied with a dilution gas stream 8 (in particular dilution air).
  • a desired dilution ratio (for example 1:10) can also be achieved in the second dilution stage 7.
  • the first dilution stage 4 and the second dilution stage 7 can each achieve the same degree of dilution, but different dilution ratios are also easily possible.
  • the dilution of the aerosol stream 3 is necessary in order to reduce the number of particles in the aerosol stream in such a way that the particles can be reliably detected by the actual measuring device.
  • Conventional measuring devices are not able to detect large numbers of particles in an aerosol stream. Sensors based in particular on an optical principle therefore require a correspondingly strong dilution.
  • a first sensor 9 serving as a particle measuring device.
  • the first sensor 9 is able to reliably detect the particles in the aerosol stream 3.
  • a condensation particle counter (CPC) has proven suitable for this purpose.
  • further particle measuring devices for example a second sensor 10, can also be provided, which are parallel to the part of the diluted aerosol stream 3 is also fed to the first sensor 9.
  • the aerosol stream 3 is thus divided into several partial streams.
  • the second sensor 10 and possibly further particle measuring devices can have the same measuring principle as the first sensor 9, but with the same but also with a deliberately different particle size sensitivity.
  • the other measuring devices or the second sensor 10 are based on a different measuring principle. In this way, the number of particles in the diluted aerosol stream 3 can be reliably determined.
  • a bypass 11 is provided, which flows through part of the aerosol flow 3 parallel to the first sensor 9 (and possibly the other sensors or particle measuring devices), as shown in particular in FIG. 1 clearly recognizable.
  • the bypass 11 has its own flow control or flow setting, as will be explained later.
  • a pump 12 serving as a conveying device is arranged for conveying a conveying volume flow 13 having the aerosol flow 3.
  • the pump 12 can be used, for example, as a diaphragm pump or rotary vane pump and is used to generate the aerosol stream 3 at the inlet 2 and pull due to a suction effect generated by the pump 12 through the described components.
  • the pump 12 pushes the delivery volume flow 13 through further components, as will be described in the following.
  • a processing device 14 is provided downstream of the pump 12 for processing the delivery volume flow 13 and thus the aerosol flow 3.
  • the processing device 14 can, for example, have a separating device for separating gas components from the delivery volume flow 13 in order to clean the delivery volume flow 13 in this way.
  • a cooling device, a condensation device, a filter device or a buffer device can be provided in the processing device 14.
  • the task of the processing device 14 is to clean the pump volume flow 13 that comes from the pump 12 and contains the aerosol flow 3 and thus particles as well as possible and to free it from such particles, solids and (also volatile) gas components.
  • the delivery volume flow 13 is now also referred to as the cleaned delivery volume flow 15.
  • the flow rate of the cleaned delivery volume flow 15 can be recorded by a flow measuring device 16 (for example a mass flow meter MFM).
  • a flow measuring device 16 for example a mass flow meter MFM.
  • the delivery volume flow 13 or cleaned delivery volume flow 15 should therefore be 5000 ml / min.
  • the flow measuring device 16 can be part of a flow control for the bypass 11.
  • the bypass 11 can be provided with a flow control element (not shown), for example an adjustable proportional valve.
  • the flow position (for example proportional valve or MFC - mass flow controller) in the bypass 1 1 thus receives a measured value from the flow measuring device 16 over the entire volume flow (delivery volume flow 13 or cleaned delivery volume flow 15) which is conveyed by the pump 12.
  • the flow control element (proportional valve) in the bypass 1 1 can be controlled accordingly.
  • the bypass 1 1 must allow a volume flow of 3400 ml / min and can be regulated accordingly.
  • the cleaned delivery volume stream 15 Downstream of the flow measuring device 16, the cleaned delivery volume stream 15 is divided, namely into the dilution gas stream 5 to the first dilution stage 4, the dilution gas stream 8 to the second dilution stage 7 and into an outlet volume stream 17.
  • the outlet volume flow 17 is - as still promoted by the excess pressure of the pump 12 - through a flow measuring device 18 (e.g. MFM) and a regulatable proportional valve 19 before it is discarded via an outlet 20.
  • a flow measuring device 18 e.g. MFM
  • the flow measuring device 18 and the proportional valve 19 form a flow control that determines the accuracy of the overall system.
  • the air or gas supply to the two dilution stages 4, 7 can also have a flow control.
  • the diluent gas stream 5 can be, for example, 450 ml / min in the example already discussed.
  • the dilution gas flow 8 to the second dilution stage 7 can also be regulated by a flow control element, consisting of a flow measuring device 23 (e.g. MFM) and a proportional valve 24.
  • a flow control element consisting of a flow measuring device 23 (e.g. MFM) and a proportional valve 24.
  • the dilution gas stream 8 in the example mentioned is 4500 ml / min.
  • flow control for the second dilution stage 7 is not absolutely necessary. Rather, it is possible to leave one dilution stage (here: the second dilution stage 7) unregulated in the case of several dilution stages (here: two dilution stages), so that the dilution gas stream which is then automatically set (here: dilution gas stream 8) is set automatically.
  • the bypass 1 1 and the outlet 20 in the manner described above and by regulating the remaining dilution levels (here: first dilution level 4), the flows in the system are sufficiently and precisely determined.
  • the above-mentioned uncontrolled return volume flow can, however, now be used for the pressure regulation in the circulatory system between the delivery device (e.g. pump 12) and the flow control devices (e.g. proportional valves 22, 24).
  • the area in which the dilution gas streams 5 and 8 are branched off from the conveying volume flow 13 or the cleaned conveying volume flow 15 is also referred to as the dividing area 25.
  • the area downstream from the branch of the dilution gas streams 5, 8, i.e. the area for the outlet volume flow 17 to the outlet 20 is also referred to as the gas sink 26.

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Abstract

L'invention concerne un système de mesure de particules (1) destiné à mesurer un nombre de particules dans un courant d'aérosol (3). Le système est pourvu d'une entrée (2) destinée à introduire le courant d'aérosol (3), d'au moins un dispositif de dilution (4) disposé en aval de l'entrée (2), d'au moins un dispositif de mesure (9) de particules disposé en aval du dispositif de dilution (4) et destiné à mesurer le nombre de particules, d'un dispositif de transport (12) disposé en aval du dispositif de mesure (9) de particules et destiné à transporter un débit volumique (13) de transport présentant le courant d'aérosol (3), d'un dispositif de traitement (14) destiné à traiter un débit volumique (13) de transport présentant le courant d'aérosol (3), d'une zone de partage (25) destinée à partager le débit volumique (15) de transport préparé en au moins un débit volumique de retour et en un débit volumique de sortie (17), et d'un puits de gaz (26) destiné à rejeter le débit volumique de sortie (17). Le débit volumique de retour peut être guidé en tant que courant de gaz (5) de dilution vers le dispositif de dilution (4).
PCT/EP2019/068957 2018-08-21 2019-07-15 Système de mesure de particule pourvu d'un dispositif de dilution et procédé pour la mesure de particules WO2020038658A1 (fr)

Applications Claiming Priority (2)

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DE102018120362.4 2018-08-21
DE102018120362.4A DE102018120362A1 (de) 2018-08-21 2018-08-21 Partikelmesssystem mit einer Verdünnungsvorrichtung und Verfahren zur Partikelmessung

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AT523917B1 (de) * 2020-08-10 2022-01-15 Avl Ditest Gmbh Abgasmessgerät und Verfahren zur Abgasmessung
DE102020133050A1 (de) 2020-12-10 2022-06-15 Hochschule Mannheim Verfahren und Gerät zur Atemaerosolmessung

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