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1. WO2022002939 - A METHOD TO PRODUCE A MATCHED PAIR OF POLARIZING FILTERS AND A METHOD AND APPARATUS TO DETERMINE THE CONCENTRATION OF BIREFRINGENT PARTICLES USING A PAIR OF POLARIZING FILTERS

Publication Number WO/2022/002939
Publication Date 06.01.2022
International Application No. PCT/EP2021/067853
International Filing Date 29.06.2021
IPC
G01N 21/23 2006.1
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
17Systems in which incident light is modified in accordance with the properties of the material investigated
21Polarisation-affecting properties
23Bi-refringence
G01J 4/04 2006.1
GPHYSICS
01MEASURING; TESTING
JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
4Measuring polarisation of light
04Polarimeters using electric detection means
G01N 33/18 2006.1
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
33Investigating or analysing materials by specific methods not covered by groups G01N1/-G01N31/131
18Water
G01N 15/00 2006.1
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
15Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
B01D 53/62 2006.1
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
53Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols
34Chemical or biological purification of waste gases
46Removing components of defined structure
62Carbon oxides
C01F 11/18 2006.1
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE EARTH METALS
11Compounds of calcium, strontium, or barium
18Carbonates
CPC
G01J 4/04
GPHYSICS
01MEASURING; TESTING
JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
4Measuring polarisation of light
04Polarimeters using electric detection means
G01N 15/06
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
15Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
06Investigating concentration of particle suspensions
G01N 2015/0053
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
15Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
0042Investigating dispersion of solids
0053in liquids, e.g. trouble
G01N 2015/0693
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
15Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
06Investigating concentration of particle suspensions
0693by optical means, e.g. by integrated nephelometry
G01N 2021/216
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
17Systems in which incident light is modified in accordance with the properties of the material investigated
21Polarisation-affecting properties
216using circular polarised light
G01N 2021/217
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
21Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
17Systems in which incident light is modified in accordance with the properties of the material investigated
21Polarisation-affecting properties
217Measuring depolarisation or comparing polarised and depolarised parts of light
Applicants
  • UNIVERSITEIT GENT [BE]/[BE]
  • DRDC VALCATIER RESEARCH CENTER [CA]/[CA]
Inventors
  • NEUKERMANS, Griet
  • FOURNIER, Georges
Agents
  • JEROEN DECLERCK, IP HILLS NV
Priority Data
20183105.430.06.2020EP
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) A METHOD TO PRODUCE A MATCHED PAIR OF POLARIZING FILTERS AND A METHOD AND APPARATUS TO DETERMINE THE CONCENTRATION OF BIREFRINGENT PARTICLES USING A PAIR OF POLARIZING FILTERS
(FR) PROCÉDÉ POUR PRODUIRE UNE PAIRE APPARIÉE DE FILTRES POLARISANTS ET PROCÉDÉ ET APPAREIL POUR DÉTERMINER LA CONCENTRATION DE PARTICULES BIRÉFRINGENTES AU MOYEN D'UNE PAIRE DE FILTRES POLARISANTS
Abstract
(EN) The invention relates to a method to produce a matched pair of polarizing filters. The method comprises the mounting of a first linear polarizer and a second linear polarizer in a beam of light, rotating the second linear polarizer to obtain maximum extinction of the beam of light, inserting a first quarter-wave optical retarder in the beam of light and rotating the first quarter- wave optical retarder to obtain maximum extinction of the beam of light, subsequently rotating the first quarter-wave optical retarder over an angle of 45 degrees, inserting a second quarter-wave optical retarder, rotating the second quarter-wave optical retarder to obtain maximum extinction of the beam of light before securing the first linear polarizer, the first quarter-wave optical retarder and the second linear polarizer and the second quarter-wave optical retarder. The invention further relates to a method and apparatus to analyze a sample comprising birefringent particles suspended in a fluid, for example suspended in a liquid using a matched pair of polarizing filters.
(FR) L'invention concerne un procédé de fabrication d'une paire appariée de filtres polarisants. Le procédé consiste à monter un premier polariseur linéaire et un second polariseur linéaire dans un faisceau de lumière, faire tourner le second polariseur linéaire pour obtenir une extinction maximale du faisceau de lumière, insérer un premier retardateur optique quart d'onde dans le faisceau de lumière et faire tourner le premier retardateur optique quart d'onde pour obtenir une extinction maximale du faisceau de lumière, faire tourner ensuite le premier retardateur optique quart d'onde sur un angle de 45 degrés, insérer un second retardateur optique quart d'onde, faire tourner le second retardateur optique quart d'onde pour obtenir une extinction maximale du faisceau de lumière avant de fixer le premier polariseur linéaire, le premier retardateur optique quart d'onde, le second polariseur linéaire et le second retardateur optique quart d'onde. L'invention concerne en outre un procédé et un appareil pour analyser un échantillon comprenant des particules biréfringentes en suspension dans un fluide, par exemple en suspension dans un liquide, à l'aide d'une paire appariée de filtres polarisants.
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