WO1986002162A1 - Appareil de mesure de concentration - Google Patents
Appareil de mesure de concentration Download PDFInfo
- 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
Links
- 238000005259 measurement Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract 5
- 239000007787 solid Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 2
- 239000000523 sample Substances 0.000 abstract description 16
- 230000028161 membrane depolarization Effects 0.000 abstract description 5
- 229920001131 Pulp (paper) Polymers 0.000 abstract description 2
- 239000013055 pulp slurry Substances 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 8
- 230000003287 optical effect Effects 0.000 description 7
- 230000004044 response Effects 0.000 description 6
- 239000000835 fiber Substances 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 2
- 235000011613 Pinus brutia Nutrition 0.000 description 2
- 241000018646 Pinus brutia Species 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002655 kraft paper Substances 0.000 description 2
- 239000010893 paper waste Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229920004943 Delrin® Polymers 0.000 description 1
- 206010034960 Photophobia Diseases 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002999 depolarising effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010252 digital analysis Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 208000013469 light sensitivity Diseases 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- G01N21/21—Polarisation-affecting properties
-
- 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
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3577—Investigating 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
- G01J1/16—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors
- G01J1/1626—Arrangements with two photodetectors, the signals of which are compared
- G01J2001/1636—Arrangements with two photodetectors, the signals of which are compared one detector directly monitoring the source, e.g. also impulse time controlling
-
- 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
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
-
- 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
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/069—Supply of sources
- G01N2201/0696—Pulsed
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/12—Circuits of general importance; Signal processing
- G01N2201/126—Microprocessor 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.
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)
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)
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 |
-
1985
- 1985-09-25 EP EP85904780A patent/EP0231179A1/fr active Pending
- 1985-09-25 AU AU49565/85A patent/AU590223B2/en not_active Ceased
- 1985-09-25 WO PCT/AU1985/000233 patent/WO1986002162A1/fr unknown
Patent Citations (12)
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)
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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