EP4314764A1 - Unité d'étalonnage pour dispositifs de mesure de particules - Google Patents

Unité d'étalonnage pour dispositifs de mesure de particules

Info

Publication number
EP4314764A1
EP4314764A1 EP22714977.0A EP22714977A EP4314764A1 EP 4314764 A1 EP4314764 A1 EP 4314764A1 EP 22714977 A EP22714977 A EP 22714977A EP 4314764 A1 EP4314764 A1 EP 4314764A1
Authority
EP
European Patent Office
Prior art keywords
test
dilution
aerosol
particle
unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22714977.0A
Other languages
German (de)
English (en)
Inventor
Mario SCHRIEFL
Alexander Bergmann
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.)
AVL Ditest Austria GmbH
Original Assignee
AVL Ditest Austria GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by AVL Ditest Austria GmbH filed Critical AVL Ditest Austria GmbH
Publication of EP4314764A1 publication Critical patent/EP4314764A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G01N15/10—Investigating individual particles
    • G01N15/1012—Calibrating particle analysers; References therefor
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N2001/2893—Preparing calibration standards
    • 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

  • Calibration unit for calibrating at least one particle measuring device, wherein an aerosol line is provided in the calibration unit, which connects a test aerosol inlet connection to a test aerosol outlet connection and the calibration unit provides a test aerosol with a predetermined concentration of test particles at the test aerosol outlet connection.
  • particulate matter pollution is a highly relevant health issue. Therefore, the analysis of particulate matter, for example as emissions from diesel engines, is of crucial importance, especially in the case of alveolar particle sizes.
  • the automotive industry in particular, but also shipping, contributes significantly to this pollution, for example through particles in an exhaust gas stream of a combustion engine, but also through other particle emissions, such as brake wear particles.
  • Regulations for the reduction or even avoidance of particulate matter pollution exist at national and supranational level. Measuring methods of particles, as well as particle measuring devices and their properties are well known. Such particle measuring devices are required in a large number of applications where either particle sizes and/or particle concentration or other particle characteristics are to be determined.
  • particle measuring devices In order to determine a reliable statement about, for example, the particle concentration of a known size in an aerosol, such particle measuring devices must be calibrated and maintained regularly, because drift or other deviations of the particle measuring device often influence the quality of the measurement in the short or long term. Such particle measuring devices are therefore subject to controls in production and also regular controls by quality control in a company.
  • IENW/BSK-2019/202498 (as amended on 11/21/2019).
  • a measurement is compared to a traceable reference device using particles in an aerosol with a geometric mean size (GMD) of 80 nm and at least 5 measuring points including the lowest and highest value of the measuring range (e.g. 5,000 pt/ccm, 50,000 pt/ccm, 100,000 pt/ccm, 500000 pt/ccm, 5000000 pt/ccm).
  • GMD geometric mean size
  • WO 2015/054462 A1 shows a calibration unit for particle measuring devices with a particle generator, a dilution stage via a dilution bridge, a mixing unit and a reference measuring device.
  • the range of the measured test particles is in a very low range with 1,000 pt/L, which corresponds to 1 pt/ccm. These values are extremely low for real particulate matter pollution.
  • WO 2019/120821 A1 discloses a calibration unit for particle measuring devices with two dilution stages and a classification unit.
  • the dilution stages are controlled via valves and venturi pumps.
  • errors in the activation of valves are high and the measurement of the particle concentration is inaccurate.
  • No concentration ranges for particle measurement are given in the disclosure.
  • the calibration units according to the state of the art allow only limited concentration gradations of the produced particle concentration. A flexible, in particular stepless, adjustment of the particle concentration is therefore not possible.
  • the object of the present invention is to provide a calibration unit that enables stepless adjustment with a large concentration range for real particulate matter emitters.
  • the technical problem is solved in that the concentration of test particles in the test aerosol can be continuously adjusted using at least one pump by means of a dilution loop.
  • Various methods can be used to dilute the particle concentration of a test aerosol.
  • part of the test aerosol is taken from an aerosol line, filtered and returned to the aerosol line as a particle-free portion.
  • An aerosol line connects a test aerosol connection to a test aerosol outlet connection, with a dilution loop being arranged between the test aerosol connection and the test aerosol outlet connection.
  • An aerosol in a preferred embodiment a test aerosol, enters the calibration unit with a specific volume flow at the test aerosol connection. From this aerosol line, part of the volume flow is conducted into the dilution loop according to the invention.
  • the level of the extracted volume flow is controlled by an adjustable pump and may not exceed the volume flow itself, in which case the concentration of test particles would be zero.
  • the higher the volume flow the better this dilution loop works, because precise control via the pump is then better possible.
  • This favors the parallel calibration of several particle measuring devices.
  • stepless dilution within different concentration ranges can be made possible, thus ensuring effective calibration of a particle measuring device at the test aerosol outlet connection.
  • expansion tanks can be used before and after the pump to eliminate any pump pulsations and thus ensure stable pump operation
  • the calibration unit according to the invention can work with a large number of different test particles.
  • test aerosols can use test particles from real emitters to be fed into the calibration unit.
  • the filter unit in the dilution loop effectively removes the particles in an aerosol.
  • at least one particle filter is arranged in the dilution loop according to the invention.
  • Particles from, for example, real emitters can also be classified in order to obtain a desired particle size distribution. In a preferred embodiment, this can be implemented using filters with a defined mesh size, or “cut-off”. Others too Classification units are conceivable. In this way, for example, a desired particle size distribution can also be set. Different particle filters with different mesh sizes can also be used.
  • a test aerosol can be made available at the test aerosol connection via a particle generator of the calibration unit.
  • particle generators can produce test particles with different size distributions and concentrations. This can be achieved, for example, via defined combustion, defined evaporation of a solvent after atomization, or ultrasonic evaporation. Depending on the application of the particle measuring device, it may be necessary to generate a test aerosol with a specific test particle size.
  • a gas can also be fed to a particle generator in order to dilute the aerosol provided and to set a specific concentration of test particles.
  • the calibration unit can preferably supply a test aerosol to several particle measuring devices in parallel at the test aerosol outlet connection. This can enable simultaneous calibration of several particle measuring devices.
  • the calibration unit especially the dilution loop, can be designed in such a way that a high volume flow of test aerosol can be processed, thereby enabling a high degree of parallelization.
  • a pressure sensor arranged in front of it can make it possible for the necessary input pressure for the particle measuring devices in the calibration device to be maintained.
  • the volume flow of test aerosol can, for example, be readjusted automatically in order to ensure a target value for the admission pressure.
  • dilution systems can also be used to increase the dynamic dilution range.
  • a gas is supplied to the test aerosol.
  • the diluted volume flow results from the sum of the volume flow of gas and the volume flow of test aerosol.
  • high dilution rates can only be achieved with difficulty because the volume flow of gas cannot be determined with sufficient accuracy.
  • concentration range of the test particles in a volume flow of the test aerosol would have to be reduced by two orders of magnitude, this would correspond to a dilution factor of 100:1.
  • the flow rate of the gas should be 9.99 Ipm, while the volume flow of test aerosol should only be 0.01 Ipm.
  • Such second diluents can therefore preferably be used for pre-dilution with a low dilution factor, since they are easy to implement and ensure a homogeneous test aerosol.
  • these diluters can increase the total volume flow in the calibration unit by adding gas, for example a particle-free gas, and thus enable more precise adjustment via the dilution loop according to the invention.
  • Diluent bridges can also be used as diluents.
  • Dilutor bridges are a subspecies of the "Bifurcated Flow Diluter" category, in which the test aerosol is divided into two branches, one of which filters the test particles of the test aerosol, while the other can use, among other things, a variable flow restriction.
  • the flow resistance can be designed, for example, as a needle valve or hose pinch device. Disadvantages of the diluter bridge are, for example, that there is no defined position of the needle valve that produces a reproducible concentration.
  • the diluter bridges can be used for constant dilutions because they make the measurement of the particle concentration highly reproducible with a single adjustment of a valve or other flow resistance.
  • Diluting bridges can therefore be used, for example, to change a concentration range in the calibration unit according to the invention as a third dilution stage.
  • such a diluting bridge can be switched on selectively via a flow control unit in order to switch between two predetermined concentrations of particles. This is advantageous for further increasing the range of a calibration.
  • only one dilution stage can be used in a calibration unit.
  • a mixing unit can be arranged after the dilution stages and the dilution loop according to the invention.
  • a mixing unit can contain flow breakers, which enable mixing or also generate a turbulent flow of the test aerosol. This ensures a spatially homogeneous distribution of the test particles in the test aerosol after the dilution loop.
  • the entire calibration process can be fully automated using a calibration unit.
  • the initial concentration of particles is important. This can be determined, for example, using an upstream reference measuring device.
  • a reference measuring device can also be arranged after the thinning loop according to the invention.
  • a reference measuring device can measure the concentrations of test particles, with a control loop providing an actual concentration on the reference measuring device, which can be set in the dilution loop, and which can display the calculated target concentrations as defined concentrations for at least one particle measuring device.
  • a reference device can also contain its own reference dilution stage, for example. This can function like a dilution loop and thereby improves the actual values obtained for a concentration of test particles on a reference measuring device for the calibration of the particle measuring device.
  • All valves can be controlled and switched over by a control unit.
  • a dilution stage can automatically switch between two dilution ranges. According to the invention, this can be realized via a diluter bridge.
  • the automated control of all valves can also be used to automatically carry out a response time test. This can sometimes be required for the routine test.
  • FIGS. 1 to 5 show advantageous configurations of the invention by way of example, schematically and not restrictively. while showing
  • FIG 1 shows the schematic structure of the calibration unit according to the invention.
  • 3 shows an exemplary structure of a calibration unit.
  • FIG 5 shows the control unit of the calibration unit according to the invention.
  • FIG. 1 shows a calibration unit 1 according to the invention in an advantageous embodiment.
  • a test aerosol 13 is supplied to the calibration unit 1 in the flow direction Z with a volume flow V.
  • the test aerosol 13 consists of a carrier gas with test particles 13a with a preferred monomodal particle size distribution.
  • Monomodal particle size distribution means a size distribution with a maximum value and a determinable deviation from the maximum value (standard deviation or variance), for example a logarithmic normal density distribution.
  • the test particles 13a in the test aerosol 13 can also have other particle size density distributions, such as bimodal or multimodal distributions, which have two or more size maxima of test particles 13a.
  • a test aerosol 13 with test particles 13a can be provided by a particle generator 2, for example.
  • a particle generator 2 can generate the test particles 13a, for example via combustion (combustion aerosol standard), or by discharge between two graphite electrodes (spark discharge) or by ultrasonic evaporation of a solution.
  • combustion combustion aerosol standard
  • spark discharge discharge between two graphite electrodes
  • ultrasonic evaporation of a solution the test particles 13a can be different and have other particle sizes and particle size distributions.
  • the particle generator 2 is usually not part of the calibration unit 1, but the calibration unit 1 can in principle be operated with any suitable particle generator 2 or other source for the test aerosol 13.
  • a particle generator 2 can produce test particles 13a made of NaCl crystals by atomizing and drying a saline solution (aerosol nebulizer) and make them available to the calibration unit 1 .
  • the calibration unit 1 can have a test aerosol inlet connection 19 to which the particle generator 2 can be connected.
  • the concentration of the test particles 13a in the test aerosol 13 is advantageously in a range of 4,000,000-7,000,000 pt/ccm, most preferably in a range of 5,000,000-5,500,000 pt/ccm. This concentration range can be particularly advantageous for any dilutions of the test aerosol 13 in the calibration unit 1 (as described below) and for the calibration of a particle measuring device 8.
  • the test aerosol 13 is transported further in the flow direction Z in the calibration unit 1 via an aerosol line 14 which is connected to the test aerosol connection 19 .
  • the aerosol line 14 can be made of different materials, which ensure the transport of the test aerosol 13 with test particles 13a.
  • the aerosol line 14 is preferably made of plastic, such as PVC, silicone, PTFE, etc., but other materials are also conceivable, for example stainless steel. Different materials can also be used for the aerosol line 14 in the calibration unit 1, in which case the inner wall of the line can preferably be antistatic or electrically conductive.
  • a dilution branch 20 branches off at a branch point 3, in which a dilution stage 6 is arranged. Downstream after the dilution stage 6, the dilution branch 20 is reintroduced into the aerosol line 14.
  • the dilution branch 20 and the dilution stage 6 form a dilution loop that enables the particle concentration to be continuously adjusted, as described below.
  • the pump 12 is in flow adjustable and enables the volume flow Vs of the test aerosol 13 to be regulated, which is branched off from the aerosol line 14 and passed via the dilution branch 20 .
  • the volume flow Vs is actively branched off from the aerosol line 14 by means of the pump 12 and this volume flow Vs does not result solely from the existing flow conditions.
  • the pump 12 can preferably be regulated in a range which is a volume flow Vs via the dilution branch 20 between zero and the total volume flow V of test aerosol 13 supplied.
  • the particle concentration in the test aerosol 13 can be influenced downstream of the junction of the dilution branch 20 in the aerosol line 14. Due to the controllability of the pump 12, this can be done practically steplessly, or at least in negligibly small increments.
  • the filter unit 17 is designed in such a way that all test particles 13a in the volume flow Vs of the test aerosol 13 are filtered out, a particle concentration of zero can also be generated if the pump 12 guides the entire supplied volume flow V via the dilution branch 20. This is advantageous, for example, in order to carry out a zero point calibration of a particle measuring device 8 downstream of the calibration unit 1 .
  • the pump 12 is switched off, no test aerosol 13 is passed through the dilution branch 20, so that no test particles 13a are filtered out of the volume flow V.
  • the dilution factor through the dilution loop would be zero.
  • only part of the volume flow V of the test aerosol 13 is routed via the dilution branch 20 , which enables flexible and stepless adjustment of the particle concentration at the outlet of the calibration unit 1 .
  • the supplied volume flow V is not changed in this embodiment, so that the same volume flow V leaves the calibration unit 1, for example at a test aerosol outlet connection 21. However, the particle concentration of this output volume flow V was adjusted as needed.
  • a particle measuring device 8 to be calibrated can be connected to the test aerosol outlet connection 21 and can now be calibrated with a defined, variable particle concentration.
  • the at least one pump 12 in the dilution branch 20 of the dilution loop is used to produce different dilutions of the test particles 13a in the test aerosol 13.
  • a concentration range for the calibration of a particle measuring device 8 can therefore be produced in a fluent manner.
  • the function of the thinning loop is explained in more detail in FIG. 2 in an exemplary embodiment.
  • the filter unit 17 can contain a plurality of HEPA filters arranged in parallel, through which the volume flow Vs of the test aerosol 13 is guided. These enable an increase in the effective filter area.
  • a serial arrangement of HEPA filters is also conceivable. This means that certain particle sizes can be classified, for example, if the HEPA filters have different mesh sizes.
  • the function of the dilution loop is made possible by at least one controllable pump 12 .
  • more than one pump 12 is also conceivable, for example in a parallel arrangement with different pump areas, in order to enable better control of the dilution loop at different volume flows in the calibration unit 1 .
  • one pump 12 can be precisely regulated in a low volume flow range, while a second pump 12 provides precise regulation for a high volume flow.
  • Diaphragm pumps, rotary vane pumps, etc. which can pump the required volume flow Vs of the test aerosol 13, can be used as the pump 12.
  • an equalizing tank 18 can be provided.
  • Such an expansion tank 18 is advantageous in order to compensate for pulsations in the pump 12 caused by pressure differences when the pump 12 is used.
  • equalizing tank 18 the dilution loop flows back into aerosol line 14.
  • FIG. 3 shows an advantageous embodiment of a calibration unit 1 according to the invention, which can be used for calibrating at least one particle measuring device 8, for example.
  • the at least one particle measuring device 8, most preferably a large number of particle measuring devices 8 can be used, for example, to measure aerosol particles in an exhaust gas from an engine, for example a diesel engine, for other particle emissions from a vehicle, for fine dust pollution measurements on busy roads, construction sites and the like are used.
  • the particle measuring devices 8 can be serviced and calibrated at regular time intervals, which is also referred to as periodic technical inspection.
  • the calibration unit 1 can preferably work with high volume flows V of test aerosol 13 . This can be preferred in order to achieve the most accurate possible dilution of the test aerosol 13 because the accuracy of the dilution increases at higher volume flows V. However, a high volume flow V can also be provided in order to be able to supply a plurality of particle measuring devices 8 with test aerosol 13 in parallel.
  • a calibration unit 1 can preferably be operated with a volume flow V of 5 to 30 lpm (liters per minute), most preferably in the range of 10-15 lpm.
  • a desired high volume flow V may not be provided by a particle generator 2 .
  • a second dilution stage 4 can therefore be provided in the calibration unit 1 on the input side, at least upstream of the dilution stage 6 in the aerosol line 14 .
  • This second dilution stage 4 can also be used to make a first pre-dilution of the test aerosol 13.
  • the test aerosol 13 is mixed with a particle-free gas 16 and diluted with it.
  • particle-free means that it does not contain any particles that are in the desired calibration range.
  • the second dilution stage 4 is a porous tube diluter.
  • this can implement a specified dilution factor of the test aerosol 13 in the preferred range of 2 to 10, most preferably 5 to 10.
  • This low dilution of the second dilution stage 4 is advantageous because it allows the dilution error to be kept small.
  • the volume flow V G of the particle-free gas 16 can be supplied, for example, via a volume flow or a mass flow controller.
  • the particle-free gas 16 can be compressed air from a compressed air supply or a compressor.
  • the compressed air can be used directly or processed particle-free via particle filters, such as HEPA filters, in order to provide particle-free air for the calibration unit 1 .
  • a first flow control unit 22 can be arranged in the aerosol line 14 at the inlet of the calibration unit 1, for example at the test aerosol inlet connection 19, which can preferably be configured as a valve, for example as a three-way valve.
  • the first flow control unit 22 can be used to route the test aerosol 13 either via an exhaust air line 23 in the direction of an exhaust air outlet 11 of the calibration unit 1 or via the aerosol line 14 in the direction of the dilution stage 6. If no volume flow V is required at the outlet of the calibration unit 1, the supplied volume flow V can simply escape as exhaust air via the exhaust air outlet 11 via the first flow control unit 22 and the exhaust air line 23 .
  • a third dilution stage 5 can be arranged in the aerosol line 14 downstream of the test aerosol inlet connection 19 , for example downstream of the second dilution stage 4 , but preferably upstream of the dilution stage 6 .
  • This third dilution stage 5 can be switched on as required via a flow control unit 24, for example a valve such as a three-way valve.
  • the third dilution stage 5 can be designed in such a way that a fixed dilution factor, in a preferred range of 0-1000, and in a most preferred range of 5-100, is achieved.
  • the third dilution stage 5 can be designed as at least one diluter bridge or as a bifurcated flow diluter.
  • This third dilution stage 5 is shown as an example in FIG. 4 as a dilution bridge.
  • the test aerosol 13 flows in flow direction Z in a constriction, which represents a flow resistance, with part of the test aerosol 13 following the direct flow path and another part of the test aerosol 13 following the parallel flow path via the filter module 17 .
  • the filter module 17 is preferably designed as a particle filter, for example as a HEPA filter.
  • the filter module 17 can also be made up of a plurality of particle filters, which can be arranged in parallel or in series in the filter module 17 .
  • the filter module 17 filters the test particles 13a out of the test aerosol 13 and thereby reduces the concentration of test particles 13a in the test aerosol 13.
  • Pre-dilution can advantageously be achieved by switching on the third dilution stage 5 via the flow control unit 24, preferably to a low concentration of test particles 13a, for example from 1,000,000 to 100,000 pt/ccm.
  • the third dilution stage 5 can be switched on as required.
  • This high concentration range preferably has a test particle 13a concentration of 5,000,000 to 100,000 pt/ccm.
  • a particle measuring device 8 can be calibrated first in the low concentration range and, after completion, to be calibrated further in the high concentration range.
  • the third dilution stage 5 can also be implemented several times in the calibration unit 1 according to the invention, for example connected in series. Then it is also possible to choose between different concentration ranges of test particles 13a in the pre-dilution.
  • the third dilution stage 5 is preferably switched on automatically via a control unit 18.
  • the input-side dilution stages 4, 5 are optional, it also being possible to implement only one of these dilution stages 4, 5 in the calibration unit 1.
  • the exhaust line 23 with the flow control unit 22 is optional and can be combined with the other components of the calibration unit 1 as desired.
  • a mixing unit 7 can be arranged in the direction of flow Z after the dilution loop.
  • the mixing unit 7 can preferably be designed as a laminar-static mixer.
  • buffer volumes in which the test particles 13a mix or mix in the test aerosol 13 via diffusion processes turbulent mixing of the test particles 13a in the test aerosol 13 via an ejector nozzle.
  • Such an ejector nozzle can itself be used as a further dilution, in that pressurized dilution air is blown through a venturi nozzle and the aerosol flow is drawn in in the vacuum area.
  • a bypass line 25 in which a pump 26 is arranged, can branch off from the aerosol line 14 via a branch point 27 downstream of the dilution loop 6 , optionally after the mixing unit 7 .
  • the bypass line 25 opens into the exhaust air line 23 downstream of the pump 26, or serves as separate exhaust air.
  • the volume flow V of test aerosol 13 through the calibration unit 1 can be increased via the bypass line 25, branch point 27 and the pump 26, also if necessary. This can be advantageous because the accuracy of the dilution is better at high volume flows.
  • a pressure sensor P can also be arranged downstream of the dilution loop 6 , optionally after the mixing unit 7 , in order to determine the pressure in the diluted test aerosol 13 .
  • the pressure sensor P can also be arranged in the bypass line 25 .
  • the pressure measurement via the pressure sensor P makes it possible to also set a desired admission pressure for a particle measuring device 8 connected to the calibration unit 1 via the bypass line 25 and the pump 26 .
  • the bypass line 25 with the pump 26, possibly with the pressure sensor P, is also optional and can also be implemented in the calibration unit 1 without the pre-dilutions on the input side.
  • the test aerosol 13 with the set concentration of test particles 13a reaches at least one particle measuring device 8, with a plurality of particle measuring devices 8 preferably being calibrated at the same time.
  • the number of possible particle measuring devices 8 depends on the volume flow V of the test aerosol 13 in the calibration unit 1.
  • a reference measuring device 10 can also be connected to the test aerosol outlet connection 21 of the calibration unit 1, which thus also receives the test aerosol 13 with the set concentration of test particles 13a.
  • the concentration of the test particles 13a in the test aerosol 13, which leaves the calibration unit 1, can thus be determined using the reference measuring device 10.
  • the reference measuring device 10 can also be a particle measuring device 8, which, however, has an accurate (and ideally traceable) calibration.
  • the reference device 10 can also be a particle counter traced back to a national standard with a higher accuracy than the particle measuring device 8 (eg a condensation germ counter).
  • a reference dilution stage 9 can be located in front of the reference measuring device 10, which can also be switched on as required via a flow control unit 27.
  • the Reference dilution stage 9 may be necessary in order to keep the concentration of the test particles 13a in the volume flow supplied to the reference measuring device 10 in an optimal range of a calibration characteristic 15′ of the reference measuring device 10. Determining the concentration of the test particles 13a using the reference measuring device 10 enables an x-value of the particle concentration to be specified for a calibration characteristic 15 (indicated in FIG. 3) of the particle measuring device 8. This allows the particle measuring device 8 to be calibrated. In principle, the error in characteristic curves at the limit values can be many times higher, as is indicated by way of example in confidence intervals 15a in calibration characteristic curve 15' of reference measuring device 10 in FIG. The concentration of the test particles 13a can therefore always be measured in a preferred manner in the central area of the calibration characteristic 15'.
  • the reference dilution stage 9 can therefore be designed like a dilution loop as described above, in order to keep the test particles 13a in the optimum range of the calibration characteristic 15' of the reference measuring device 10.
  • Such a calibration characteristic 15 is preferably determined via a regression.
  • a regression can be mapped using various functions, for example linear, polynomial, logarithmic or also using discontinuous functions.
  • a regression can be represented using a calibration characteristic 15 .
  • a particle concentration x can be plotted against a measurement signal y supplied by a particle measuring device 8, as shown in FIG.
  • More than one particle measuring device 8 is preferably calibrated at the same time. These calibration characteristics 15 can then be used, for example, to obtain the real particle concentration x in real operation via a measurement signal y.
  • the particle measuring device 8 can be designed in any way. Any possible measuring method for measuring signals y of the particle measuring device 8 which is familiar to a person skilled in the art can be used in a particle measuring device 8 .
  • the calibration unit 1 can be controlled via a control unit 18, as shown in FIG.
  • the control unit 18 can control the dilution stage 6 via the pump 12 in order to carry out the calibration with the required concentration of test particles 13a.
  • the setpoint for controlling the pump 12 in the dilution loop 6 can be changed via the control unit 18 in order to produce 5-15 discrete concentrations of test particles 13a.
  • the control unit 18, which can also monitor and control the calibration of the at least one particle measuring device 8, can therefore specify the concentration of test particles 13a in the test aerosol 13 at the test aerosol outlet connection 21 of the calibration unit 1.
  • control unit 18 can calculate the required volume flow V of test aerosol 13 .
  • three particle measuring devices 8 can be connected in parallel and have a requirement for 4 Ipm test aerosol 13 each Particle measuring device 8.
  • the reference measuring device 10 can have a requirement of 1.5 lpm test aerosol 13.
  • Control unit 18 now controls, for example, the inflow of particle-free gas 16 and the first flow control unit 22 in order to ensure the necessary volume flow V.
  • the required volume flow V can be readjusted if necessary if a pressure sensor P registers an inlet pressure that is too low at the entrance to the particle measuring devices 8 .
  • control unit 18 can also switch on second flow control unit 24 for further predilution in third dilution stage 5, in order to achieve a low concentration range of test particles 13a in test aerosol 13.
  • Control unit 18 can also control the concentration of test particles 13a via reference measuring device 10 .
  • the control unit 18 can carry out the calibration of each particle measuring device 8 via a calibration unit 1 in a controlled manner. If the calibration is successful, the particle generator 2 can be shut down and the volume flow V reduced to a minimum value in order to prevent the aerosol lines 14 from becoming blocked.
  • control via the control unit 18 can be specified by the user via a program routine and run completely automatically.
  • control unit 18 can be implemented as microprocessor-based hardware on which the program routine is executed.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Molecular Biology (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

L'invention concerne un procédé pour régler la concentration de particules de particules de test (13a) dans un aérosol de test (13) au niveau d'un raccord de sortie d'aérosol de test (21) d'une unité d'étalonnage (1). Le raccord de sortie d'aérosol de test (21) est raccordé à un raccord d'entrée d'aérosol de test (19) dans l'unité d'étalonnage par l'intermédiaire d'une conduite d'aérosol (14). L'invention est caractérisée en ce qu'un écoulement volumétrique (Vs) fait l'objet d'une dérivation à partir de la conduite d'aérosol (14) dans une branche de dilution (20) agencée à un emplacement de branche (3). L'écoulement volumétrique (Vs) est réglé au moyen d'au moins une pompe (12), dont le débit traversier peut être régulé, dans la branche de dilution (20), et l'écoulement volumétrique (Vs) ayant fait l'objet d'une dérivation est conduit par l'intermédiaire d'au moins une unité de filtre (17) de façon à filtrer des particules de test (13a) de l'écoulement volumétrique (Vs) dans la branche de dilution (20). L'écoulement volumétrique filtré est ensuite renvoyé dans la conduite d'aérosol (14).
EP22714977.0A 2021-03-26 2022-03-24 Unité d'étalonnage pour dispositifs de mesure de particules Pending EP4314764A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50221/2021A AT524564B1 (de) 2021-03-26 2021-03-26 Kalibriereinheit für Partikelmessgeräte
PCT/AT2022/060089 WO2022198254A1 (fr) 2021-03-26 2022-03-24 Unité d'étalonnage pour dispositifs de mesure de particules

Publications (1)

Publication Number Publication Date
EP4314764A1 true EP4314764A1 (fr) 2024-02-07

Family

ID=81326594

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22714977.0A Pending EP4314764A1 (fr) 2021-03-26 2022-03-24 Unité d'étalonnage pour dispositifs de mesure de particules

Country Status (3)

Country Link
EP (1) EP4314764A1 (fr)
AT (1) AT524564B1 (fr)
WO (1) WO2022198254A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT526770B1 (de) 2023-02-17 2024-07-15 Avl Ditest Gmbh Kalibrieraerosol und Kalibrieranordnung und Kalibrierverfahren mit diesem Kalibrieraerosol

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5492001B2 (ja) * 2010-07-23 2014-05-14 株式会社堀場製作所 排ガス分析システム
US8813582B1 (en) * 2012-05-17 2014-08-26 The United States Of America As Represented The Secretary Of The Army Dilution and sampling system
GB201311097D0 (en) * 2013-06-21 2013-08-07 Particle Measuring Syst A method and apparatus for dilution of aerosols
US9254500B2 (en) * 2013-10-09 2016-02-09 Massachusetts Institute Of Technology Aerosol generation for stable, low-concentration delivery
JP6429590B2 (ja) * 2014-10-27 2018-11-28 株式会社堀場製作所 排ガス分析システム及びポンプ装置
US10876929B2 (en) * 2017-08-31 2020-12-29 Horiba, Ltd. Exhaust gas analysis device, exhaust gas analysis method and storage medium recording programs for exhaust gas analysis device
DE102017130978B3 (de) * 2017-12-21 2019-06-19 Horiba Europe Gmbh System zum Überprüfen von Aerosol- und Flussmessgeräten
DE102017130981B3 (de) 2017-12-21 2019-06-19 Horiba Europe Gmbh System zum Bereitstellen eines Aerosols

Also Published As

Publication number Publication date
WO2022198254A1 (fr) 2022-09-29
AT524564A4 (de) 2022-07-15
AT524564B1 (de) 2022-07-15

Similar Documents

Publication Publication Date Title
EP0670490B1 (fr) Méthode et appareil pour la mesure d'un milieu gazeux avec un détecteur chimique
DE69315463T2 (de) Subsonische Venturi-proportionale und isokinetische Probenentnahmeverfahren und Vorrichtung
DE69021836T2 (de) Verdünnungssystem mit Mehrrohrströmungsteiler.
AT391556B (de) Verfahren und einrichtung zur stetigen entnahme einer teilmenge aus einem gasstrom
EP2414808B1 (fr) Installation de prélèvement d'échantillons de gaz d'échappement de moteurs à combustion interne
DE10220154B4 (de) Abgas-Partikel-Mess-System
DE3312525C2 (de) Vorrichtung und Verfahren zur Messung und Überwachung des Aufteilungsverhältnisses verzweigter Gasströme
WO2020038658A1 (fr) Système de mesure de particule pourvu d'un dispositif de dilution et procédé pour la mesure de particules
DE602004004688T2 (de) Aktive Steuerung der Temperatur eines Filters
EP0314731B1 (fr) Agencement pour la production de concentrations determinees de substances gazeuses et le melange de substances gazeuses diverses selon un rapport predetermine
DE3875071T2 (de) Gasprobennahmevorrichtung.
DE102008047404B4 (de) Einem Partikelzähler vorzuschaltende Einrichtung zur in sich geschlossenen Verdünnung von Aerosolen
AT524564B1 (de) Kalibriereinheit für Partikelmessgeräte
DE2932436A1 (de) Massenstromabhaengiger gasanalysator mit durchflussregelung im unterdruckbetrieb
EP0471174A2 (fr) Installation pour l'analyse d'éléments polluants, en particulier d'émissions de particules de gaz d'échappement de moteurs diesel, avec un dispositif de dilution d'un courant partiel
DE102017130978B3 (de) System zum Überprüfen von Aerosol- und Flussmessgeräten
DE4121928C2 (de) Verfahren und Anordnung zur indirekten Massendurchflußbestimmung
EP3492900A1 (fr) Procédé et dispositif de dilution d'un aérosol
DE102017130981B3 (de) System zum Bereitstellen eines Aerosols
DE2833553C2 (fr)
EP3492901B1 (fr) Dispositif et procédé de dilution d'un aérosol
EP1590408B1 (fr) Generateur de suie pourvu d'une conduite de gaz d'extinction retrecie
AT518184B1 (de) Messgas Entnahmeeinrichtung
AT514381B1 (de) Venturiverdünner
EP0809109A2 (fr) Appareil pour la mesure de composants de gaz d'échappement d'une machine à combustion

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20230922

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)