WO1986002162A1 - Appareil de mesure de concentration - Google Patents

Appareil de mesure de concentration Download PDF

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Publication number
WO1986002162A1
WO1986002162A1 PCT/AU1985/000233 AU8500233W WO8602162A1 WO 1986002162 A1 WO1986002162 A1 WO 1986002162A1 AU 8500233 W AU8500233 W AU 8500233W WO 8602162 A1 WO8602162 A1 WO 8602162A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
detector
detectors
photo
light source
Prior art date
Application number
PCT/AU1985/000233
Other languages
English (en)
Inventor
Erich Stumpf
Lawrence Walter Cahill
David John Boldiston
Original Assignee
Apm Limited
Australian Newsprint Mills Limited
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 Apm Limited, Australian Newsprint Mills Limited filed Critical Apm Limited
Publication of WO1986002162A1 publication Critical patent/WO1986002162A1/fr

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/21Polarisation-affecting properties
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3577Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing liquids, e.g. polluted water
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00Photometry, e.g. photographic exposure meter
    • G01J1/10Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/16Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors
    • G01J1/1626Arrangements with two photodetectors, the signals of which are compared
    • G01J2001/1636Arrangements with two photodetectors, the signals of which are compared one detector directly monitoring the source, e.g. also impulse time controlling
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84Systems specially adapted for particular applications
    • G01N21/85Investigating moving fluids or granular solids
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00Features of devices classified in G01N21/00
    • G01N2201/06Illumination; Optics
    • G01N2201/069Supply of sources
    • G01N2201/0696Pulsed
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00Features of devices classified in G01N21/00
    • G01N2201/12Circuits of general importance; Signal processing
    • G01N2201/126Microprocessor processing

Definitions

  • This invention relates to a concentration meter for measuring volume concentration of fibrous solids in liquids.
  • this meter has application in measuring stock consistency of wood fibre slurries. It is known that polarized light incident on a single fibre will be depolarized by a certain amount; several fibres will depolarize a given quantity of light more than a single fibre. An estimation of stock consistency can be made if polarized light is passed through a stream of stock, and the amount of depolarization is measured.
  • U.S. Patent 4,171,916 discloses apparatus for measuring fibre concentration in a pulp suspension in which polarized light is passed at right angles through a flow cell through which the sample is allowed to pass. Two detectors are used one having an axis of transmission parallel to and the other crossed with the plane of polarization of the light beam.
  • the detectors provide electrical signals which are processed to give a consistency measurement of the sample.
  • This patent discloses using a large continuous beam of light in the visible range.
  • U.S. patent 3,653,767 also discloses the use of polarized light in this case to determine particle size distribution by measuring the degree of depolarization that occurs at different wavelengths.
  • the volume of particles suspended in a fluid can be measured by measuring the depolarization of light having a wavelength approximately two times the particle size of the particles to be measured.
  • the reason for using a pulsed light source is to ensure that the same particle is not the subject of each measurement and to also lower energy consumption.
  • Measurement of particle size as suggested in this patent is based on the measurement of back scattering.
  • the present invention provides apparatus for measuring volume concentration of optically active solids suspended in a liquid comprising a cell for containing the suspension to be measured, a pulsed infra-red light source which emits a narrow beam of polarized light at right angles to the cell, a first photo-detector on the opposite side of the cell to the light source, a second photodetector with an associated polarizing filter located on the opposite side of the cell to the light source, computing means to analyse the signals received from said first and second photo-detectors and produce a signal corresponding to the ratio of signals from said first detector to said second detector and optional display means fro displaying or recording in' suitable form the measurement so obtained.
  • the unique features of "this invention are: 1.
  • the apparatus uses infra-red or red light preferably in the wavelength range of 600 to 650 nm which gives a linear response. It is preferred that the band width is narrow as in a laser. Colour and suspended solids have less effect on consistency estimation at longer wavelengths.
  • a consequence of the use of an infra-red source is that a semi-conductor diode detector can be used and this gives the consequent advantage of lower engergy use.
  • the light source is pulsed.
  • the combination of digital electronics with a pulsed source allows the inherent problems of analogue electronics to be overcome, i.e. drift, offset and sensitivity which develops with, for example, ageing of the equipment. An automatic intensity control is not required.
  • the response rate of the equipment is measurable.
  • Microprocessor control allows the response rate and delay associated with all electronic devices to be measured and accounted for in calculations within the instrument.
  • the light beam is fine.
  • the optical nonlinearities of the- system have very little effect, particularly with changing temperatures. It has been shown that the narrow beam may permit development of this instrument to measure flocculation and fibre length distribution.
  • the apparatus functions as follows.
  • the light passes through a polarizer, a measuring cell and a beam splitter.
  • One of the resulting beams is collected while the other passes through another polarizing filter before being collected.
  • the collection is done by semiconductor diodes.
  • Stock flows through the measuring cell at 90° to the light beam.
  • the electrical signals produced by the detectors in response to the pulsed source and the stock variations are used in three ways.
  • the pulp density is a function of the ratio P MATN / P RE F where P MAIN is the optical power received by the main detector and P REF is that received by the reference detector.
  • the two detector signals i MAIN /i REF are amplified and the zero light offsets i OMAIN and i OREF are removed. This gives absolute measures of light intensity falling on the detectors through the sample chamber. For a photo-detector whose output current is linearily related to the incident optical power, This gives us the measurement of pulp density.
  • the ranges of concentration over which the instrument gives a linear response is 0.05 to 2.57. and .possibly up to 10%.
  • FIG. 1 A preferred form of the detector system is shown in Figures 1, 2 and 3 of the drawings and figures 4 to 6 show measurement results for particular suspensions. Another form of the invention is shown in figures 9, 10 and 11 which illustrate an in pipe probe.
  • the entire transducer is machined from a solid piece of 2" Delrin plastic rod. All mountings are achieved by slots, channels or holes cut into the plastic.
  • Alignment of the optical components in the prototype is achieved by drilling along a common axis. This allows the source, aperture, lens and main detector to be precisely centered. A half silvered mirror 7 allows part of the light to be collected at a reference detector 9 at 90° to the main beam.
  • Polarization is achieved by using a Polaroid polarizing filter 2.
  • a narrow beam red LED 1 is used as the source and illuminates the pulp 4.
  • a brass bayonet acts as an aperture 5.
  • a short focal length lens 6 then produces an image on the detectors 9 and 10.
  • a half silvered mirror 7 By using a half silvered mirror 7 after the lens, two images are obtained at the detectors.
  • another polarizing filter 8 In front of the main detector 10 is another polarizing filter 8.
  • the polarizers are aligned by placing water or air in the sample chamber 3 and one of the polarizers is rotated until a minimum is achieved at the main detector.
  • An extinction ratio (the ratio of minimum to maximum light) of 1% was easily achieved.
  • Figure 2 is a cross-sectional view of a preferred form of the sample tube.
  • the narrow section 21 comprises the flow through cell of the detector, and the wider sections 22 correspond to the diameter of the conduit for pumping the suspension.
  • Figure 3A is a schematic plan of the instrument connected to the main stock flow line and figure 3B is a block diagram of the instrument.
  • Samples for testing are collected from the main stock flow line 30 by the valve and dip tube sampling assembly 31. These samples pass into the sample head 33 via the input line 32 and are returned via line 34. Power is provided by cable 35 to the electronics board 36.
  • the electrical ouput signal of the photo detectors 40 and 41 are filtered by filters 42 and 43 to remove unwanted spectral information.
  • Analogue to digital converters (A/D) 44 and 45 transform the filtered electrical signals into digital 8-bit binary parallel forms 47 by control of the microprocessor 52 through line 48.
  • the pulsed light source 55 is an L.E.D. controlled through an adapting interface 56 by the microprocessor 54 running a light emission program in its peripheral read only memory.
  • the light from the L.E.D. 55 is received at the photo detectors 40 and 41 after passing through the series of polarizing and depolarizing filters and the sample cell as described above.
  • the output signals 49 and 50 of the converters 44 and 45 are produced concurrently.
  • Output 50 from converter 45 is stored in a buffer memory 51 until the output 49 from converter 44 is read by microprocessor 54 through the parallel part 52.
  • Control switches 53 allow the operator to present the equipment output signal in the desired form.
  • the digital binary parallel output signal is converted to an analogue current by the output current source 57 and the condition of the instrument is displayed on the front panel indicators 58.
  • the equipment is powered by a D.C. power supply 59.
  • the instrument was used to measure pulp concentration for bleached unrefined pine kraft pulp, reslushed corrugating medium and waste paper stock for concentrations from 0 to 2 gms/dry wt. per 100 gms.
  • the results are shown in figures 4 to 6 respectively and the milliamp outut of the photo detectors show a linear response to concentration, within the useful light intensity range of the detectors, for the three stock types.
  • the limit of the device is determined by the opacity of the stock being measured and the lower limit of light sensitivity of the detector.
  • This invention is not only applicable to measuring concentration of paper pulp but also for other optically active substances. If the substances are not optically active they can be treated to render the surface optically active.
  • Figures 4 to 7 and 8 refer to tests made upon suspensions of bleached unrefined pine kraft (figure 4), reslushed corrugating medium (figure 5), waste paper stock (figure 6), raw wheaten starch (figure 7) and clay (figure 8) with the system of this invention set for maximum damping and maximum gain, with 2 volt maximum output range.
  • the present invention can also be adapted for use as in pipe probe to provide processing control information.
  • a probe is illustrated schematically in figures 9 to 11 in which figure 9 is a side view of the end of the probe figure 10 is a view at right angles to the view of figure 9 and figure 11 is a plan view of the end of the probe.
  • the probe 39 has at its lower end a channel 40 bounded by two legs 41 and 42.
  • the channel 40 is aligned in the direction of flow of the stock to be measured.
  • the optical system is arranged in the legs 41 and 42 with the light source 43 in leg 41 and the photo-detectors 44 and 45 in leg 42.
  • a sealing barrier 46 separates the optical system from the electronic circuting located either in the main body of the probe or in a separate unit.
  • the optical system and the electronic system are the same as outlined above except they are adapted to fit the confined space of the probe. From the above it can be seen that the combination of measuring depolarization by comparison of two signals and identifying a narrow pulsed infra-red beam with digital analysis provides the basis for a robust means for obtaining concentration measurements .

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Air Bags (AREA)
  • Drying Of Semiconductors (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)

Abstract

Appareil de mesure de concentration destiné à la mesure de la consistance d'une pulpe de papier dans la plage de concentration comprise entre 0,5 et 10%. L'appareil de mesure de concentration mesure la dépolarisation de la lumière traversant une boue de pulpe et utilise une diode électroluminescente (1) émettant des impulsions lumineuses infrarouges à faisceau étroit, en combinaison avec un circuit électronique numérique, de manière à obtenir une mesure continue de la concentration. L'instrument peut être modifié pour former une jauge dans une conduite, afin de mesurer la concentration de la pulpe pendant le processus de fabrication du papier.
PCT/AU1985/000233 1984-09-26 1985-09-25 Appareil de mesure de concentration WO1986002162A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPG7348 1984-09-26
AUPG734884 1984-09-26

Publications (1)

Publication Number Publication Date
WO1986002162A1 true WO1986002162A1 (fr) 1986-04-10

Family

ID=3770775

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1985/000233 WO1986002162A1 (fr) 1984-09-26 1985-09-25 Appareil de mesure de concentration

Country Status (3)

Country Link
EP (1) EP0231179A1 (fr)
AU (1) AU590223B2 (fr)
WO (1) WO1986002162A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986007458A1 (fr) * 1985-06-10 1986-12-18 Chemtronics Ab Procede de mesure de la concentration en fibres et en materiau de remplissage de la partie humide d'une machine a papier et systeme de commande appliquant ce procede
WO1988003266A1 (fr) * 1986-10-24 1988-05-05 David Murray Goodall Appareil optique et procede d'utilisation
EP0340184A2 (fr) * 1988-02-26 1989-11-02 BTG Källe Inventing Aktiebolag Méthode et appareil pour déterminer la concentration d'une substance liée à des particules dans un milieu en écoulement
WO1991000993A1 (fr) * 1989-07-10 1991-01-24 Fladda Gerdt H Appareil et procede de mesure
WO1993005384A1 (fr) * 1991-09-12 1993-03-18 Procheck Ab Procede et systeme de determination des caracteristiques de fibres par spectroscopie a infrarouge proche
WO1999066309A1 (fr) * 1998-06-12 1999-12-23 Glukomeditech Ag PROCEDE POLARIMETRIQUE POUR LA DETERMINATION DU PLAN D'OSCILLATION (PRINCIPAL) DE LA LUMIERE POLARISEE SUR ENVIRON 0,1 m°, ET DISPOSITIF MINIATURISABLE POUR SA MISE EN OEUVRE
WO2010026281A1 (fr) * 2008-09-05 2010-03-11 Metso Automation Oy Détermination de la quantité d'amidon
CN102305728A (zh) * 2011-08-22 2012-01-04 湖南长天自控工程有限公司 支管溢出式矿浆浓度在线取样测量装置
CN102590055A (zh) * 2012-02-08 2012-07-18 杨英杰 锅炉一次风煤粉浓度在线测量装置
EP2694729B1 (fr) * 2011-04-05 2017-11-22 Nalco Company Procédé de surveillance de matières collantes macroscopiques dans un procédé de recyclage et de fabrication de papier ou de papier-mouchoir mettant en jeu de la pâte recyclée
GB2605630A (en) * 2021-04-08 2022-10-12 Plankton Analytics Ltd A flow cell and use thereof

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU266554A1 (ru) * Украинский научно исследовательский институт целлюлозно бумажной Способ контроля содержания волокна в оборотных
US3283644A (en) * 1962-11-27 1966-11-08 Du Pont Apparatus for determining the concentration of dispersed particulate solids in liquids
US3518003A (en) * 1965-07-23 1970-06-30 Fredrik W Meyn Procedure for continuous registration of the concentration of fibre suspensions
US3600094A (en) * 1968-11-12 1971-08-17 American Standard Inc Suspended solids concentration measurement using circular polarized light
US3612689A (en) * 1967-04-10 1971-10-12 American Standard Inc Suspended particle concentration determination using polarized light
US3612688A (en) * 1968-11-13 1971-10-12 American Standard Inc Suspended organic particles monitor using circularly polarized light
US3640626A (en) * 1968-11-12 1972-02-08 American Standard Inc Measuring of the concentration of solid particles suspended in various regions in a fluid using polarized light
US3724957A (en) * 1971-03-04 1973-04-03 Yokogawa Electric Works Ltd Concentration measuring apparatus
SU381720A1 (ru) * 1971-06-21 1973-05-22 Способ контроля содержания волокна в оборотных
US4171916A (en) * 1977-11-18 1979-10-23 Ishikawajima-Harima Heavy Industries Co., Ltd. Apparatus and method for measuring the consistency of a pulp suspension
AU9046482A (en) * 1981-11-25 1983-06-02 Bergstrom, Per-Hakan Measuring particle concentration
EP0030610B1 (fr) * 1979-10-31 1986-03-05 Arno Dr. Dipl.-Phys. Müller Procédé et dispositif de détermination quantitative de substances optiquement actives

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU266554A1 (ru) * Украинский научно исследовательский институт целлюлозно бумажной Способ контроля содержания волокна в оборотных
US3283644A (en) * 1962-11-27 1966-11-08 Du Pont Apparatus for determining the concentration of dispersed particulate solids in liquids
US3518003A (en) * 1965-07-23 1970-06-30 Fredrik W Meyn Procedure for continuous registration of the concentration of fibre suspensions
US3612689A (en) * 1967-04-10 1971-10-12 American Standard Inc Suspended particle concentration determination using polarized light
US3600094A (en) * 1968-11-12 1971-08-17 American Standard Inc Suspended solids concentration measurement using circular polarized light
US3640626A (en) * 1968-11-12 1972-02-08 American Standard Inc Measuring of the concentration of solid particles suspended in various regions in a fluid using polarized light
US3612688A (en) * 1968-11-13 1971-10-12 American Standard Inc Suspended organic particles monitor using circularly polarized light
US3724957A (en) * 1971-03-04 1973-04-03 Yokogawa Electric Works Ltd Concentration measuring apparatus
SU381720A1 (ru) * 1971-06-21 1973-05-22 Способ контроля содержания волокна в оборотных
US4171916A (en) * 1977-11-18 1979-10-23 Ishikawajima-Harima Heavy Industries Co., Ltd. Apparatus and method for measuring the consistency of a pulp suspension
EP0030610B1 (fr) * 1979-10-31 1986-03-05 Arno Dr. Dipl.-Phys. Müller Procédé et dispositif de détermination quantitative de substances optiquement actives
AU9046482A (en) * 1981-11-25 1983-06-02 Bergstrom, Per-Hakan Measuring particle concentration

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986007458A1 (fr) * 1985-06-10 1986-12-18 Chemtronics Ab Procede de mesure de la concentration en fibres et en materiau de remplissage de la partie humide d'une machine a papier et systeme de commande appliquant ce procede
WO1988003266A1 (fr) * 1986-10-24 1988-05-05 David Murray Goodall Appareil optique et procede d'utilisation
US5012101A (en) * 1986-10-24 1991-04-30 National Research Development Corporation Optical apparatus and method
EP0340184A2 (fr) * 1988-02-26 1989-11-02 BTG Källe Inventing Aktiebolag Méthode et appareil pour déterminer la concentration d'une substance liée à des particules dans un milieu en écoulement
EP0340184A3 (fr) * 1988-02-26 1991-07-17 BTG Källe Inventing Aktiebolag Méthode et appareil pour déterminer la concentration d'une substance liée à des particules dans un milieu en écoulement
EP0582320A3 (en) * 1989-07-10 1994-07-13 Fladda Gerdt H Measuring apparatus and method
WO1991000993A1 (fr) * 1989-07-10 1991-01-24 Fladda Gerdt H Appareil et procede de mesure
US5245200A (en) * 1989-07-10 1993-09-14 Fladda Gerdt H Apparatus and method for preventing blockage of a measuring head for effecting measurements of suspended substances
EP0582320A2 (fr) * 1989-07-10 1994-02-09 FLADDA, Gerdt Heinrich Appareil et procédé de mesure
US5536942A (en) * 1991-09-12 1996-07-16 Procheck Ab Method and arrangement for determining fibre properties by near-infrared-spectroscopy
WO1993005384A1 (fr) * 1991-09-12 1993-03-18 Procheck Ab Procede et systeme de determination des caracteristiques de fibres par spectroscopie a infrarouge proche
WO1999066309A1 (fr) * 1998-06-12 1999-12-23 Glukomeditech Ag PROCEDE POLARIMETRIQUE POUR LA DETERMINATION DU PLAN D'OSCILLATION (PRINCIPAL) DE LA LUMIERE POLARISEE SUR ENVIRON 0,1 m°, ET DISPOSITIF MINIATURISABLE POUR SA MISE EN OEUVRE
US6577393B1 (en) 1998-06-12 2003-06-10 Glukomeditech Ab Polarimetric method for determining the (main) vibration plane of polarized light to about 0.1m° and miniaturized device for its implemention
WO2010026281A1 (fr) * 2008-09-05 2010-03-11 Metso Automation Oy Détermination de la quantité d'amidon
US9029776B2 (en) 2008-09-05 2015-05-12 Metso Automation Oy Determining the amount of starch
EP2694729B1 (fr) * 2011-04-05 2017-11-22 Nalco Company Procédé de surveillance de matières collantes macroscopiques dans un procédé de recyclage et de fabrication de papier ou de papier-mouchoir mettant en jeu de la pâte recyclée
CN102305728A (zh) * 2011-08-22 2012-01-04 湖南长天自控工程有限公司 支管溢出式矿浆浓度在线取样测量装置
CN102590055A (zh) * 2012-02-08 2012-07-18 杨英杰 锅炉一次风煤粉浓度在线测量装置
GB2605630A (en) * 2021-04-08 2022-10-12 Plankton Analytics Ltd A flow cell and use thereof
WO2022214813A1 (fr) 2021-04-08 2022-10-13 Plankton Analytics Limited Cuve à circulation et son utilisation

Also Published As

Publication number Publication date
AU4956585A (en) 1986-04-17
AU590223B2 (en) 1989-11-02
EP0231179A1 (fr) 1987-08-12

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