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WO2008105726A1 - Dispositif et méthode de détection de particules présentes dans un flux. - Google Patents

Dispositif et méthode de détection de particules présentes dans un flux. Download PDF

Info

Publication number
WO2008105726A1
WO2008105726A1 PCT/SE2008/050202 SE2008050202W WO2008105726A1 WO 2008105726 A1 WO2008105726 A1 WO 2008105726A1 SE 2008050202 W SE2008050202 W SE 2008050202W WO 2008105726 A1 WO2008105726 A1 WO 2008105726A1
Authority
WO
WIPO (PCT)
Prior art keywords
chamber
flow
detector
containing particles
particle
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/SE2008/050202
Other languages
English (en)
Inventor
Jürgen PERSSON
Mikael Modh
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.)
PROMECH LAB AB
Original Assignee
PROMECH LAB AB
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 PROMECH LAB AB filed Critical PROMECH LAB AB
Publication of WO2008105726A1 publication Critical patent/WO2008105726A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/85—Investigating moving fluids or granular solids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
    • G01N2021/151—Gas blown

Definitions

  • the present invention relates to a device and a method for detecting particles in a flow containing particles.
  • This type of devices and methods is used to monitor, examine or analyse possible particles in a flow, such as an aerosol flow.
  • This type of devices and methods is well known for monitoring or examining a gas, such as air, to analyse the presence of or quantity of dif- ferent types of solid or liquid particles therein.
  • a gas such as air
  • such devices are used for monitoring smoke or contaminations in air or to monitor aerosol flows within different fields, such as inhalation studies within the medical field.
  • a plurality of different types of devices for detecting particles in a flow containing particles, such as an aerosol, is disclosed in the prior art.
  • One such type of device is for example disclosed in DE4105190.
  • the device disclosed in DE4105190 comprises a particle chamber having an inlet and an outlet, so that an aerosol can flow through it.
  • a detector is arranged in the particle chamber to detect the presence of particles substantially perpendicular to the aerosol flow.
  • the device according to DE4105190 comprises an inlet for pure air which is brought to enclose the aerosol flow and form a barrier to avoid contamination of the walls of the particle chamber and the optical system of the detector.
  • An object of the present invention is to overcome the above-mentioned drawbacks and problems of prior art and reduce the risk of contamination when detecting particles in a flow containing particles, such as an aerosol, further.
  • the invention substantially eliminates the risk of contamination, wherein the device substantially never or very seldom must be cleaned as a consequence of particle contamination from the flow containing particles.
  • the invention also results in that the risk of contamination is substantially reduced also at quite low flow rates and during start up and termination of an analysis. Simultaneously, a quite small and convenient device is provided which easily can be adjusted in accordance with different fields of application.
  • the present invention comprises a device for detecting particles in a flow containing particles, comprising a particle chamber having an inlet and an outlet for a flow containing particles flowing through the particle chamber, and a detector for detecting particles in the flow containing particles, the detector being arranged at an angle to the particle chamber, characterised in that the detector is arranged in a detector chamber being arranged at an an- gle to the particle chamber, the detector chamber being connected to the particle chamber through an aperture through which detection can be performed, and the detector chamber being provided with an intake channel for introducing a counterflow, wherein said counterflow can flow in through the intake channel, through the detector chamber and out through the aperture at an angle to the flow containing particles to prevent this from entering the detector chamber or to direct this away from the detector chamber.
  • the device is void of contamination protection, such as glass walls, prisms or similar, as is generally used in the prior art to avoid contamination between the detector and the particle chamber.
  • the flow containing particles is an aerosol or similar.
  • the device can comprise or can be connected to a unit for providing a difference in pressure between the detector chamber and the particle chamber, so that the counterflow flows from the detector chamber and into the particle chamber.
  • the unit can be arranged as a pump for providing a negative pressure in the particle chamber compared to the detector chamber, so that the flow containing particles is brought to flow through the particle chamber towards the outlet and so that the counterflow is sucked into the detector chamber and further into the particle chamber through the aperture.
  • the unit is arranged as a compressor for blowing in the aerosol or the gas containing particles to provide the flow containing particles.
  • an ejector effect or venturi effect can be used by reducing the area of the inlet, so that the flow rate through the particle chamber is increased. Consequently, air or similar is drawn in through the intake channel to form the counterflow.
  • the invention can be used as a smoke monitoring unit
  • SMU in which vacuum or a vacuum pump is arranged at the outlet from the particle chamber, so that the particles is drawn in through the inlet in the top.
  • the vacuum which results in a negative pressure, through the particle chamber draws in air, pure air or similar through the intake channel to the detector chamber and further through the aperture to the particle flow or the flow containing particles through the particle chamber.
  • This difference in pressure makes it nearly impossible for the particles to contaminate sensitive equipment.
  • the intake channel is adjusted with respect to the flow or the vacuum, so that no negative pressure is formed in the detector chamber.
  • the device can also comprise a light source chamber, such as a laser chamber, for a light source, such as a laser device. Further, the device can comprise a light trap arranged in a light trap chamber. The laser chamber and the chamber of the light trap can be arranged similar to the detector chamber, i.e. having an intake channel for a counterflow, so that the counter- flow can flow through the chamber and through the aperture into the particle chamber to force the flow containing particles away from each of the cham- bers.
  • a light source chamber such as a laser chamber
  • the device can comprise a light trap arranged in a light trap chamber.
  • the laser chamber and the chamber of the light trap can be arranged similar to the detector chamber, i.e. having an intake channel for a counterflow, so that the counter- flow can flow through the chamber and through the aperture into the particle chamber to force the flow containing particles away from each of the cham- bers.
  • the invention is also related to a method for detecting particles in a flow containing particles, comprising the steps of bringing a flow containing particles to flow into a particle chamber through an inlet, bringing the flow containing particles to flow through the particle chamber and out through an outlet, and detecting particles in the flow containing particles by means of a detector, characterised by the steps of introducing a counterflow into a detector chamber for the detector, bringing the counterflow to flow through the detector chamber and at an angle, such as perpendicularly, into the particle chamber and by this preventing the flow containing particles to enter the de- tector chamber or directing the flow containing particles away from the detector chamber.
  • Fig. 1 is a schematic perspective view of a device according to one embodiment example of the present invention
  • Fig. 2 is a schematic view of the device according to Fig. 1 , seen along a particle chamber of the device and along the flow direction of the flow containing particles,
  • Fig. 3 is a schematic section view of the device along the line l-l in Fig. 2, and
  • Fig. 4 is a schematic section view along the line H-Il in Fig. 2.
  • a device 10 for detecting particles in a flow containing particles is illustrated schematically.
  • the device 10 is arranged to enable monitoring, examination and/or analysis of a flow to obtain information about presence, quantity or type of particles in the flow.
  • the device 10 comprises a particle chamber 11 having an inlet 12 and an outlet 13 for the flow containing particles flowing through the particle chamber and which is to be examined.
  • the particle chamber 11 is connected to a detector chamber 14 for a detector 15, wherein the detector 15 is at least partially arranged inside the detector chamber 14 or so that the detector 15 projects into the detector chamber 14.
  • the detector chamber 14 is arranged at an angle to the particle chamber 11 , so that the flow containing particles can be detected at an angle to its flow direction.
  • the detector chamber 14 is arranged substantially perpendicular to the particle chamber 14.
  • the detector 15 is, for example, a conventional detector for detecting particles in an aerosol.
  • the detector 15 is arranged for detecting light and the detector 15 also includes accessories, such as optical accessories for transmitting the light to the detecting components of the detector 15.
  • the particle chamber 11 is also connected to a light source 17 arranged in a light source chamber 16.
  • the light source chamber 16 and the light source 17 are optional, depending on the type of detector 15 used.
  • the light source chamber 16 is arranged at an angle to the particle chamber 11 , so that the light from the light source 17 can flow at an angle to the flow direction of the flow containing particles.
  • the light source chamber 16 is arranged substantially perpendicular to the particle chamber 11 , wherein the light can flow substantially perpendicular to the flow direction of the flow containing particles.
  • the light source 17 is a conventional light source.
  • the light source cham- ber 16 is a laser chamber, wherein the light source 17 is a laser device.
  • the particle chamber 11 is also connected to a light trap 19 arranged in a light trap chamber 18.
  • the light trap chamber 18 is optional.
  • the light trap chamber 18 is arranged on an opposite side of the particle chamber 11 as the light source chamber 16, so that light from the light source 17 can flow across the flow containing particles and further into the light trap 19.
  • the light trap chamber 18 is arranged substantially perpendicular to the particle chamber 11.
  • the light source is, for example, a conventional light trap.
  • a section view of the device 10 is shown in which the direction of the flow containing particles through the particle chamber 11 is illustrated by means of the arrow A.
  • the detector chamber 14 is connected to the particle chamber 11 through an aperture 20 through which detection can be performed.
  • the detector chamber 14 forms a space between the detector 15 and the particle chamber 11 , so that the detector 15 is arranged at a distance from the particle chamber 11 and communicates with it through the aperture 20.
  • the aperture 20 is arranged in the wall of the particle chamber 11 and extends through it substantially perpendicular to the direction of the particle chamber 11 or to the flow containing particles therein.
  • the detector 15 is ar- ranged so that the flow containing particles flowing through the particle chamber 11 can be detected through the detector chamber 14 and the aperture 20.
  • the detector 15 is arranged so that the particles in the flow containing particles can be detected substantially perpendicular to the flow direction of the flow containing particles.
  • the detector chamber 14 is formed with an intake channel 21 for introducing a counterflow, wherein the counterflow can flow in through the intake channel 21 , through the detector chamber 14 and out through the aperture 20 at an angle to the flow containing particles, as is shown by means of the arrow B, to prevent the flow containing particles from entering the detector chamber or to direct it away from the detector chamber 14 and the detector 15 to avoid contamination thereof.
  • the intake channel 21 is, for example, arranged at a distance from the aperture 20, such as at the detector 15. According to the illustrated embodiment the intake channel 21 is arranged perpendicular to the aperture 20. Alternatively, the intake channel 21 is inclined towards the aperture 20, so that the counterflow is directed towards the aperture 20.
  • the device 10 comprises a unit, such as a compressor or a pump or similar, which is not illustrated in the drawings.
  • the device 10 is connected to such a unit.
  • the unit is arranged for bringing the flow containing particles to flow through the particle chamber 11 towards the outlet 13 and for bringing the counterflow to flow in through the intake channel 21 , through the detector chamber 14, through the aperture 20 and further through the particle cham- ber 11 towards the outlet 13.
  • the unit is arranged for providing a pressure difference between the detector chamber 14 and the particle chamber 11 , such as a lower pressure in the particle chamber 11 than in the detector chamber 14, so that the counterflow flows from the detector chamber 14 to the particle chamber 11 and further towards the outlet 13.
  • the unit is a pump arranged downstream or a compressor arranged upstream.
  • a section view of the device 10 is shown, in which the light source chamber 16 and the light trap chamber 18 are arranged similar to the detector chamber 14 to avoid contamination. As described above the light source chamber 16 is arranged at an angle to the par- tide chamber 11. When the optional light trap chamber 18 is used the light source chamber 16 and the light trap chamber 18 are suitably arranged on opposite sides of the particle chamber 11 and preferably substantially perpendicular to it.
  • the light source chamber 16 is connected to the particle chamber 11 through an aperture 20 through which light can flow substantially perpendicular to the flow containing particles.
  • the light source chamber 16 forms a space between the light source 17 and the particle chamber 11 , so that the light source 17 is arranged at a distance from the particle chamber 11.
  • the light source chamber 16 is arranged with an intake channel 21 for a counter- flow similar to the detector chamber 14, wherein the counterflow can flow in through the intake channel 21 , through the light source chamber 16 and out through the aperture 20 at an angle, such as perpendicular, to the flow con- taining particles to prevent this from entering the light source chamber or to block or direct it away from the light source chamber 16 to avoid contamination.
  • the light trap chamber 18 is connected to the particle chamber 11 through an aperture 20 through which light can flow substantially perpendicu- lar to the flow containing particles.
  • the light trap chamber 18 forms a space between the light trap 19 and the particle chamber 11 , so that the light trap 19 is arranged at a distance from the particle chamber 11.
  • the light trap chamber 18 is arranged with an intake channel 21 for a counterflow similar to the detector chamber 14, wherein the counterflow can flow in through the intake channel 21 , through the light trap chamber 18 and out through the aperture 20 at an angle, such as perpendicular, to the flow containing particles to prevent this from entering the light trap chamber or to block or direct it away from the light trap chamber 18 to avoid contamination.
  • the direction of the counterflow through the light trap chamber 18, into the particle chamber 11 and further through the particle chamber 11 is illustrated in Fig. 4 by means of the arrow D.

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  • Chemical & Material Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Dispersion Chemistry (AREA)
  • Measuring Volume Flow (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)

Abstract

L'invention porte sur un dispositif (10) et une méthode de détection de particules présentes dans un flux. Le dispositif (10) comprend: une chambre à particules (11) présentant un orifice d'entrée (12) et un orifice de sortie (13) du flux contenant des particules traversant la chambre à particules (11), et un détecteur (15) des particules présentes dans le flux, le détecteur étant incliné par rapport à la chambre à particules (11). Le détecteur (15) est placé dans une chambre de détection (14), inclinée par rapport à la chambre à particules (11), et relié à la chambre à particules (11) par une ouverture par laquelle la détection peut s'opérer. La chambre de détection présente également un canal (21) d'introduction d'un contre-flux qui traverse la chambre de détection (14) et ressort par l'ouverture (20) en faisant un angle avec le flux contenant les particules pour l'empêcher de pénétrer dans chambre de détection (14).
PCT/SE2008/050202 2007-02-27 2008-02-21 Dispositif et méthode de détection de particules présentes dans un flux. Ceased WO2008105726A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0700478A SE0700478L (sv) 2007-02-27 2007-02-27 Anordning och metod för detektering av partiklar i ett partikelhaltigt flöde
SE0700478-1 2007-02-27

Publications (1)

Publication Number Publication Date
WO2008105726A1 true WO2008105726A1 (fr) 2008-09-04

Family

ID=39721493

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2008/050202 Ceased WO2008105726A1 (fr) 2007-02-27 2008-02-21 Dispositif et méthode de détection de particules présentes dans un flux.

Country Status (2)

Country Link
SE (1) SE0700478L (fr)
WO (1) WO2008105726A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013130810A1 (fr) * 2012-02-28 2013-09-06 Norma U.S. Holding Llc Ensemble et support de capteur de système de réduction catalytique sélective (scr) d'automobile
CN109791104A (zh) * 2017-09-14 2019-05-21 盛思锐股份公司 颗粒物传感器装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3833305A (en) * 1969-09-17 1974-09-03 Commercial Electronics Inc Gas analyzing apparatus
DE3638472A1 (de) * 1985-11-22 1987-05-27 Volkswagen Ag Einrichtung zur optischen vermessung oder beobachtung von abgasen einer dieselbrennkraftmaschine
JPH03180740A (ja) * 1989-12-11 1991-08-06 Hitachi Electron Eng Co Ltd 微粒子検出セルのパージエア流通方式
FR2667941A1 (fr) * 1990-10-16 1992-04-17 Volkswagen Ag Dispositif permettant la mesure dynamique de la densite de particules dans un flux gazeux.
DE4105190C2 (de) * 1991-02-20 1995-03-16 Fraunhofer Ges Forschung Streulichtaerosoldetektor
JP2004264146A (ja) * 2003-02-28 2004-09-24 Horiba Ltd 簡易な汚れ防止および補正機能を有する光学装置および分析計

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3833305A (en) * 1969-09-17 1974-09-03 Commercial Electronics Inc Gas analyzing apparatus
DE3638472A1 (de) * 1985-11-22 1987-05-27 Volkswagen Ag Einrichtung zur optischen vermessung oder beobachtung von abgasen einer dieselbrennkraftmaschine
JPH03180740A (ja) * 1989-12-11 1991-08-06 Hitachi Electron Eng Co Ltd 微粒子検出セルのパージエア流通方式
FR2667941A1 (fr) * 1990-10-16 1992-04-17 Volkswagen Ag Dispositif permettant la mesure dynamique de la densite de particules dans un flux gazeux.
DE4105190C2 (de) * 1991-02-20 1995-03-16 Fraunhofer Ges Forschung Streulichtaerosoldetektor
JP2004264146A (ja) * 2003-02-28 2004-09-24 Horiba Ltd 簡易な汚れ防止および補正機能を有する光学装置および分析計

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013130810A1 (fr) * 2012-02-28 2013-09-06 Norma U.S. Holding Llc Ensemble et support de capteur de système de réduction catalytique sélective (scr) d'automobile
US9388932B2 (en) 2012-02-28 2016-07-12 Norma U.S. Holding Llc Automotive selective catalytic reduction (SCR) system sensor holder and assembly
CN109791104A (zh) * 2017-09-14 2019-05-21 盛思锐股份公司 颗粒物传感器装置
JP2020533592A (ja) * 2017-09-14 2020-11-19 センシリオン アーゲーＳｅｎｓｉｒｉｏｎ ＡＧ 粒子状物質センサーデバイス
KR20220103817A (ko) * 2017-09-14 2022-07-22 센시리온 에이지 미립자 센서 장치
JP7179057B2 (ja) 2017-09-14 2022-11-28 センシリオン アーゲー 粒子状物質センサーデバイス
US11898953B2 (en) 2017-09-14 2024-02-13 Sensirion Ag Particulate matter sensor device
US11940370B2 (en) 2017-09-14 2024-03-26 Sensirion Ag Particulate matter sensor device
KR102654643B1 (ko) 2017-09-14 2024-04-04 센시리온 에이지 미립자 센서 장치

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Publication number Publication date
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