WO2016180907A1 - Dispositif et procédé pour le comptage et/ou la mesure de particules dans un flux de liquide - Google Patents

Dispositif et procédé pour le comptage et/ou la mesure de particules dans un flux de liquide Download PDF

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Publication number
WO2016180907A1
WO2016180907A1 PCT/EP2016/060616 EP2016060616W WO2016180907A1 WO 2016180907 A1 WO2016180907 A1 WO 2016180907A1 EP 2016060616 W EP2016060616 W EP 2016060616W WO 2016180907 A1 WO2016180907 A1 WO 2016180907A1
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WO
WIPO (PCT)
Prior art keywords
particles
sensor
light
fluid flow
light source
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.)
Ceased
Application number
PCT/EP2016/060616
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German (de)
English (en)
Inventor
Martin CRESNOVERH
Alexander Bergmann
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AVL List GmbH
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AVL List GmbH
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Filing date
Publication date
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Priority to DE112016002151.8T priority Critical patent/DE112016002151A5/de
Publication of WO2016180907A1 publication Critical patent/WO2016180907A1/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
    • 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
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N15/1434—Optical arrangements
    • 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
    • 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
    • G01N15/0227—Investigating particle size or size distribution by optical means using imaging; using holography
    • 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
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N15/1429—Signal processing
    • G01N15/1433—Signal processing using image recognition
    • 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
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N15/1456—Optical investigation techniques, e.g. flow cytometry without spatial resolution of the texture or inner structure of the particle, e.g. processing of pulse signals
    • G01N15/1459—Optical investigation techniques, e.g. flow cytometry without spatial resolution of the texture or inner structure of the particle, e.g. processing of pulse signals the analysis being performed on a sample stream
    • 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
    • G01N15/075—Investigating concentration of particle suspensions by optical means
    • 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
    • G01N2015/0681—Purposely modifying particles, e.g. humidifying for growing
    • 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
    • G01N2015/1027—Determining speed or velocity of a particle
    • 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
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N15/1434—Optical arrangements
    • G01N2015/1454—Optical arrangements using phase shift or interference, e.g. for improving contrast
    • 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
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N2015/1486—Counting the particles
    • 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
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N2015/1493—Particle size
    • 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

Definitions

  • the invention relates to a device for counting and / or measuring particles in a fluid flow, wherein the device comprises a light source for the illumination of the fluid flow in a region of a measuring channel, which is flowed through by the fluid flow, and a
  • Light sensor having a plurality of sensor elements, which are arranged in the light beam emitted by the light source and on the light source opposite sides of the measuring channel has.
  • the invention relates to a method for counting and / or measuring particles in a fluid flow, wherein the fluid flow in a region of a measuring channel, which is flowed through by the fluid flow, is transilluminated by a light source, wherein the light emitted by the light source at the light source opposite side of the measuring channel is detected by a light sensor with a plurality of sensor elements.
  • particle counters of the prior art are usually designed as a one-dimensional particle counter, in which the particle flow after the condensation unit is passed through a separating nozzle.
  • the particles can therefore be singulated with a sufficiently high probability, ie one after the other, exit from the nozzle to allow a count of the individual particles as possible without coincidences.
  • the particles to be measured generally move at high speeds of, for example, about 10 to 100 m / s through the detection volume.
  • the high passage velocities and the relatively small dimension of the condensed droplets (about 5-20 ⁇ ) here require a high sensitivity and a high temporal resolution of the sensors.
  • State-of-the-art particulate counters designed as full-flow apparatus are currently able to handle fluids with a particle density of up to 20,000 particles / cm 3 . This count limit is determined primarily by the coincidence probability. Coincidence occurs when two particles pass the laser beam so close to each other that only one pulse is detected instead of two individual pulses.
  • US 2010/0141945 A1 discloses an apparatus and a method for determining properties of particles.
  • the particles are individually guided by a separating nozzle at a defined position through a light beam, wherein the scattering pattern of the light beam caused by the particle is evaluated to determine the particle properties.
  • US 201 1/0043607 A1 discloses a method for measuring particle properties, wherein a sample with the particles is illuminated by a collimated laser beam, and the scattering pattern is measured and evaluated with a holographic microscope.
  • US 2007/0285660 A1 discloses a method and an apparatus for analyzing particles in a fluid medium.
  • the particles are illuminated in a confinement of laser light and the interference patterns caused by the particles are detected in a detector plane and evaluated to determine particle properties.
  • the objectives of the invention are achieved by a device of the type mentioned above, wherein an evaluation unit is provided, which composes a plurality of successive sensor measurements to a sensor image and for measuring and / or counting of the particles interference pattern in the sensor image caused by the particles be evaluated.
  • the interference pattern of a particle per se circular in the image plane is shown distorted as ellipses due to the velocity and the direction of movement of the particle, so that not only the position and size of a particle, but also its velocity and direction of motion can be evaluated based on the shape , Furthermore, a fluid flow can be monitored continuously, which is not possible with a snapshot.
  • the sensor image reflects a continuous course of the particle flow, the individual sensor measurements preferably being recorded with a continuous frequency.
  • the coherence length of the light source corresponds at least to the distance between the light source and the sensor elements. This ensures reliable evaluability of the sensor image.
  • the plurality of sensor elements may be formed as a line detector. It can be achieved with conventional, inexpensive and easily available line sensors high measurement performance.
  • a plurality of line detectors arranged one behind the other in the flow direction can be used in order to further increase the measurement accuracy and reliability of the device by redundant individual counts.
  • the multiplicity of line detectors can be advantageously designed as a sensor field of an image sensor, so that known, inexpensive and readily available sensors can be used.
  • the device may be a counting unit of a condensation particle counter.
  • the growth of the condensation particles can be checked and a quality control can be carried out.
  • properties of the fluid flow such as the flow rate or the Reynolds number, can be checked.
  • a “sensor image” is considered to be a set of individual measurements which in combination can give a pictorial pattern.
  • the term “sensor image” is thus not limited to a specific pictorial representation but also includes the corresponding data record independently of a representation.
  • a position and / or a direction of movement and / or a size and / or a velocity of a particle can be calculated from the sensor image.
  • any analytical methods and algorithms can be used which are suitable for the evaluation of holographic images.
  • hologram images reconstructed in hologram planes which differ from the sensor plane, can be calculated using the Angular Spectrum Method known per se.
  • From reconstructed hologram images in hologram planes intersecting the particle position, size, velocity, direction of motion and position of the particle can be determined.
  • a flow profile of the fluid flow can be determined on the basis of the position and movement data of a plurality of particles.
  • the counted or measured particles are selected from solid particles, liquid particles, aerosols and / or condensation particles.
  • Solid particles may be, for example, soot particles from combustion processes, fine dust or mechanical abrasion of tires or brake linings. Larger particles can be measured directly, smaller particles, which are no longer detected due to the wavelength of the light, can be increased to condensation particles by means of known means and methods before the measurement.
  • FIG. 1 is a schematic representation of a particle in a laser light measuring arrangement, for explaining the formation of interference patterns.
  • FIG. 2 shows an exemplary interference pattern in a snapshot
  • FIG. 3 is a schematic perspective view of a first embodiment of the device according to the invention in a side view;
  • Fig. 4 is a schematic perspective view of the device of Figure 3 in a plan view.
  • 5 shows a schematic representation of a sensor image with a multiplicity of interference patterns
  • 6 shows a single interference pattern of the sensor image in an enlarged representation
  • FIG. 7 shows a reconstructed hologram image in a hologram plane extending parallel to the laser beam direction
  • FIG. 8 shows a reconstructed hologram image in a reconstructed hologram plane extending parallel to the sensor plane and spaced from the sensor plane;
  • Fig. 9 is a schematic representation of positions, directions of movement and velocities of particles in the measuring channel.
  • FIG. 1 shows the change in wave propagation in a laser light wavefront caused by a single particle 1.
  • collimated laser light is emitted by a light source 4, strikes the particle 1 and is then picked up by a 2D light sensor 6. Due to the interference between the light deflected by the particle and the light undisturbed by the particle, a holographic pattern is formed in the sensor plane, which is recorded by the light sensor 6 and shown in FIG. 2.
  • the pattern consists of a number of concentric circles, from the size, intensity and width conclusions about the properties of the particle 1 can be drawn.
  • the relationships shown in FIGS. 1 and 2 are known in the prior art, for example from US2010 / 0141945, but the possibilities of evaluating such snapshots are limited and not suitable for continuous measurement.
  • FIGS. 3 and 4 a device according to the invention is shown schematically in a side view (FIG. 3) and a top view (FIG. 4).
  • the x-axis is referred to as the sensor axis
  • the y-axis as the orthogonal axis
  • the z-axis as the light axis.
  • the reference numerals of these particles are supplemented to distinguish with lowercase letters.
  • the device for counting particles 1 a-1 g has a measuring channel 2, through which a fluid flow 3 is guided, in which the particles to be counted 1 a-1 g are carried.
  • the fluid flow 3 may be, for example, exhaust gas from an engine or any other particle-carrying fluid.
  • a light source 4 is arranged so that it forms a flat carpet of light 5 in a plane parallel to the sensor and the light axis, which is substantially transverse to the axis of the measuring channel 2, wherein the light source 4 emits a coherent laser light.
  • the carpet of light 5 thus extends across the measuring channel 2.
  • the flow direction of the measuring channel 2 extends at an advantageous angle of 90 ° to the carpet of light 5, but other angles would be possible.
  • the carpet of light 5 impinges on the side opposite the measuring channel 2 on a light sensor 6, which has a plurality of arranged in the region of the carpet of light 5 sensor elements 7, each corresponding to a pixel.
  • the signals recorded by the light sensor 6 are evaluated by an evaluation unit 12 to count the particles.
  • Measuring channel 2 is the region in which the fluid flow runs.
  • the measuring channel 2 shown in FIG. 1 has a round cross section, but it can also have any other cross section.
  • the flow direction of the fluid flow 3 in the measuring channel runs essentially parallel to the orthogonal axis y.
  • the measuring channel 2 may have a continuous outer wall, which has a light-permeable window in the region of the light carpet 5.
  • the course of the outer wall of the measuring channel 2 in the area of the light carpet 5 (or the light source 4 and the light sensor 6) can be widened in order to receive the light source 4 and the light sensor 6.
  • an outlet nozzle which directs the fluid stream 3 in a controlled manner through the carpet of light 5 (such outlet nozzle is not provided in the embodiment of Figs. 3 and 4 and therefore not shown).
  • the outlet nozzle can accelerate the fluid flow 3 through a narrowing of the flow cross-section, or slow it down by expanding the flow cross-section.
  • the sensor elements 7 of the light sensor 6 have a linear arrangement in the manner of a line scan camera, the line length extending essentially over the entire cross section of the measurement channel or even beyond.
  • Fig. 3 are three particles 1f, 1 d and 1 e in the region of the carpet of light 5 and three further particles 1 a, 1 b and 1 c have already crossed the carpet of light 5 and are continued by the fluid flow 3 in the flow direction.
  • a particle 1 g is still in front of the carpet of light 5.
  • the size ratios of the device and the particles shown are strongly distorted and the number of particles 1 a-1 g shown and the sensor elements 7 are limited for clarity.
  • Each particle 1 d, 1 e, 1 f in the carpet of light 5 generates in a sensor plane 8 a similar interference pattern, as shown in Fig. 2, which is in the sensor plane 8 as a plurality of concentric circles, each having a different diameter and different intensity.
  • Corresponding interference patterns are formed both by droplet-shaped particles and by solid particles, it being possible for the interference patterns to have different qualities.
  • the light sensor 6 since the light sensor 6 has only a linear arrangement of sensor elements 7, whereby a line detector known per se can be used, only one line of the interference pattern with the light sensor 6 can be picked up at any one time. While the particles 1 a-1 g are moving with the fluid flow 3 through the carpet of light 5, the light sensor 6 captures line exposures at a specific recording frequency, which can be combined line by line into a sensor image 9, as shown in FIG. 5 is shown by way of example. Among other things, the flow velocity of the fluid, the width of the carpet of light 5 and / or the pixel size of the sensor element 7 in the flow direction can be taken into account for determining the suitable absorption frequency.
  • the thickness d of the carpet of light 5 is chosen so that for each particle when passing through the carpet of light 5, i. between the moment when the particle 1 enters the carpet of light 5 (such as the particle 1 e in Fig. 3) and the moment when it leaves the carpet of light 5 again (eg particles 1 d in Fig. 3), a sufficiently large Interference pattern, ie results in an interference pattern of evaluable size and with a sufficient number of rings in the sensor image.
  • FIG. 5 shows the line acquisitions combined to form a sensor image 9 in a time range of approximately 23 ms with a sensor width of approximately 10 mm.
  • the abscissa shows the sensor axis x, the ordinate the time axis t.
  • the sensor image 9 has similarities with a snapshot, such as can be made with a 2D image sensor, and the interference pattern 10 can be clearly seen in the sensor image. Since, however, this is not a snapshot, but rather a line image recorded at a time offset, which has been assembled to form the sensor image 9, the temporal component additionally has an effect on the shape of the interference patterns 10, which are each distorted into an elliptical shape. In particular, the velocity of the particles has an effect kung on the shape of the respective interference pattern.
  • the speeds and directions of movement of the particles 1 belonging to the interference patterns 10 are indicated in FIG. 5 by vector arrows.
  • the reference pattern 10a and the reference pattern 10b each have an approximately circular shape. This shape arises when the particle has moved between two images by exactly one pixel width of the sensor elements. Faster particles pass through the carpet of light 5 in a shorter time and this therefore leads to a representation of the corresponding interference pattern which is compressed in the time axis t, as can be seen for example in the case of the interference patterns 10c and 10d. On the other hand, slower particles cause a shape of the interference pattern elongated in the time axis t, such as in the interference patterns 10e and 10f. Also, a movement obliquely to the flow direction of the fluid flow 3 affects the shape of the interference pattern by an inclination of the ellipse main axes.
  • the method according to the invention could also be implemented with a device according to FIG. 1 (with a 2D image sensor), wherein in each case only one line of the 2D image sensor or only a limited number of lines are evaluated.
  • the automated counting of the interference patterns can be done, for example, with known image recognition algorithms (e.g., model-dependent segmentation), whereby a very accurate count of the number of particles in the fluid can be achieved.
  • known image recognition algorithms e.g., model-dependent segmentation
  • Information on the velocity of the particles can be obtained from the distortion from the circular shape of the interference pattern, with an evaluation based on the principal axis ratio or other parameters of the ellipse shape (height h, diameter d, vertices A and B, lateral offset W of the vertices, major axes - lengths, etc.) can take place. Examples of such parameters are shown in FIG.
  • an evaluation of the ellipse shape in the sensor image 9 recorded in the sensor plane can be too inaccurate for a high measurement resolution.
  • the size, as well as the position of the interference pattern 10 are reconstructed and evaluated by reconstruction algorithms in other planes.
  • An example of a reconstruction algorithm is the Angular Spectrum Method, which is described inter alia in T. Shimobaba, J. Weng, T. Sakurai, N. Okada, T. Nishitsuji, N. Takada, A. Shiraki, N. Masuda, and T.
  • the reconstruction algorithms can be carried out according to the invention essentially with the same mathematical algorithms as are used for holographic snapshots, wherein the evaluation of the temporally offset recorded sensor image 9 compared to a conventional evaluation of a holographic moment recording has some special features.
  • FIG. 7 shows a part of a reconstructed hologram image in a hologram plane which has been laid parallel to the time axis t and to the light axis (ie vertically parallel to the light axis z) through the position of a particle 1 (ie through the midpoint of one of the images shown in FIG elliptical interference pattern 10).
  • the ordinate axis (light axis z) in FIG. 7 indicates the distance to the sensor plane 8. From the reconstructed hologram image shown in FIG. 7, the position of the particle with respect to the light axis z can be determined at the point where the elongated elongate interference pattern 10 has a minimum extension.
  • the position of the particle 1 when passing through the carpet of light 5 (or the plane defined by the sensor axis x and the light axis z) is thus known in all three coordinate axes.
  • FIG. 8 shows a further reconstructed hologram image which was reconstructed in a plane running parallel to the sensor plane through the position of the particle 1, wherein the region of the interference pattern 10 of the particle 1 is shown magnified like a magnifying glass.
  • the elliptical interference pattern is very flat and essentially has a line shape from whose angle to the time axis t the direction of movement of the particle 1 in the x-y plane can be derived with knowledge of the exposure time per line. From the length of the flat interference pattern, the velocity of the particle 1 can be determined.
  • the direction of movement of the particle with respect to the plane running parallel to the orthogonal axis / light axis can be determined by making one of them as high as possible resolved hologram image a variety of reconstructions in the area around the particle position is calculated. If, as a variation of the reconstruction position on the light axis, the minimum of the extension of the pattern in the xt plane shifts in the time axis, this change in the minimum position as a function of the light axis can be used to determine the direction of motion and velocity in the yz plane ,
  • the measured values of the speed, direction of movement and size of the measured particles can be evaluated to evaluate the flow characteristics in the measuring channel.
  • the particles 1 measured over a certain period of time are combined into a three-dimensional representation, wherein the time axis was converted into a length specification with the aid of the mean flow velocity.
  • the representation allows a quick visual check of the flow behavior of the fluid in the measuring channel.
  • key figures such as the Reynolds number, can be determined from the individual measured values.
  • the device according to the invention is suitable for counting particles of very different sizes, it can be used for counting a wide variety of particle and fluid types, with pretreatment of the particles in a condensation unit often not being necessary.
  • the device can also be used advantageously for counting condensation nuclei.
  • the growth size of the condensation nuclei around the particles does not affect the accuracy of the count, so that the quality and thus the cost of the condensation unit over known systems can be greatly reduced without deteriorating the count result.
  • the quality of growth i.e., the size or uniformity of the grown particles
  • the condensation unit can be determined without additional measurement technology, which can be used for the calibration, maintenance and development of condensation particle counters. In many cases it is possible to carry out the counting of the particles without prior condensation, in particular if the particle sizes are significantly above the wavelength of the light emitted by the light source.
  • Evaluation unit 12 Sensor measurement 13 Line detector 14

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
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  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
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  • Engineering & Computer Science (AREA)
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  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

L'invention concerne un dispositif et un procédé pour le comptage et/ou la mesure de particules (1) dans un flux de liquide (3). Le procédé présente une source lumineuse (4) pour éclairer le flux de liquide (3) dans une zone d'un canal de mesure (2) qui est traversée par le flux de liquide (3) et un détecteur de lumière (6) ayant une pluralité d'éléments de détection (7) qui sont agencés dans le faisceau lumineux diffusé à partir de la source lumineuse (4) et sur les côtés du canal de mesure (2) opposés à la source lumineuse (4). Il est prévu une unité d'évaluation (12) qui assemble une pluralité de mesures de détection (13) successives en une image de détection (9) et qui, pour mesurer et/ou compter les particules (1), évalue des modèles d'interférence (10) dans l'image de détection (9) qui sont causés par les particules (1).
PCT/EP2016/060616 2015-05-12 2016-05-12 Dispositif et procédé pour le comptage et/ou la mesure de particules dans un flux de liquide Ceased WO2016180907A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112016002151.8T DE112016002151A5 (de) 2015-05-12 2016-05-12 Vorrichtung und Verfahren zur Zählung und/oder Messung von Partikeln in einem Fluidstrom

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ATA50395/2015A AT516846B1 (de) 2015-05-12 2015-05-12 Vorrichtung und Verfahren zur Zählung und/oder Messung von Partikeln in einem Fluidstrom
ATA50395/2015 2015-05-12

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GB2615089A (en) * 2022-01-26 2023-08-02 Beyond Blood Diagnostics Ltd Cell counting device

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DE102018119081A1 (de) * 2018-08-06 2020-02-06 Foshan Sensicfusion Technology Co., Ltd. Ein Verfahren und eine Vorrichtung zum Zählen von Luftpartikeln
DE102022002967B3 (de) 2022-08-16 2023-09-14 Mercedes-Benz Group AG Leuchteinrichtung für eine dynamisch veränderliche Lichtausbringung im lnnenraum eines Fahrzeuges
DE102024126322A1 (de) * 2024-09-12 2026-03-12 EEW Energy from Waste GmbH Verfahren zur Bestimmung von Rauchgasverhalten in einem Strahlungszug einer Verbrennungsanlage

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