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1. WO2020092121 - CHARACTERIZATION OF OPTICAL RETARDANCE OF A GLASS-BASED SAMPLE USING LIGHT-SCATTERING POLARIMETRY

Publication Number WO/2020/092121
Publication Date 07.05.2020
International Application No. PCT/US2019/057854
International Filing Date 24.10.2019
IPC
G01N 21/21 2006.01
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
G01N 21/49 2006.01
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
47Scattering, i.e. diffuse reflection
49within a body or fluid
G01L 1/24 2006.01
GPHYSICS
01MEASURING; TESTING
LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
1Measuring force or stress, in general
24by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis
G01N 21/23 2006.01
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
CPC
G01J 3/447
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
3Spectrometry; Spectrophotometry; Monochromators; Measuring colours
28Investigating the spectrum
447Polarisation spectrometry
G01N 2021/4735
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
47Scattering, i.e. diffuse reflection
4735Solid samples, e.g. paper, glass
G01N 2021/4792
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
47Scattering, i.e. diffuse reflection
4792Polarisation of scatter light
G01N 21/21
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
G01N 21/23
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
G01N 21/47
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
47Scattering, i.e. diffuse reflection
Applicants
  • CORNING INCORPORATED [US]/[US]
Inventors
  • FURNAS, William John
Agents
  • JOHNSON, Kevin M.
Priority Data
62/753,38831.10.2018US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) CHARACTERIZATION OF OPTICAL RETARDANCE OF A GLASS-BASED SAMPLE USING LIGHT-SCATTERING POLARIMETRY
(FR) CARACTÉRISATION DE RETARD OPTIQUE D'UN ÉCHANTILLON À BASE DE VERRE À L'AIDE DE LA POLARIMÉTRIE DE DIFFUSION DE LUMIÈRE
Abstract
(EN)
Methods of characterizing an optical retardance or a stress-related property of a glass-bases sample include directing a light beam (112) into the glass-based sample (10) while varying the polarization of the light beam to generate scattered light (112S) for each polarization. The scattered light for each polarization is captured with an image sensor (114), which has an exposure time and a frame rate. The scattered light has an intensity distribution at the image sensor. The sample is moved so that the image sensor averages two or more different intensity distributions per frame to form an averaged intensity distribution for each polarization. The averaged intensity distributions for multiple frames are then used to characterize the optical retardance. The optical retardance can be used to determine stress-related properties of the glass-based sample. Moving the substrate reduces measurement noise due to scattered light having no optical retardance information.
(FR)
L'invention concerne des procédés de caractérisation d'un retard optique ou d'une propriété liée au stress d'un échantillon de base de verre consistant à diriger un faisceau de lumière (112) dans l'échantillon à base de verre (10) tout en faisant varier la polarisation du faisceau de lumière pour générer une lumière diffusée (112S) pour chaque polarisation. La lumière diffusée pour chaque polarisation est capturée avec un capteur d'image (114), doté d'un temps d'exposition et d'une fréquence de trames. La lumière diffusée présente une distribution d'intensité au niveau du capteur d'image. L'échantillon est déplacé de telle sorte que le capteur d'image calcule au moins deux distributions d'intensité différentes par trame pour former une distribution d'intensité moyenne pour chaque polarisation. Les distributions d'intensité moyennes pour de multiples trames sont ensuite utilisées pour caractériser le retard optique. Le retard optique peut être utilisé pour déterminer des propriétés liées au stress de l'échantillon à base de verre. Le déplacement du substrat réduit le bruit de mesure grâce à la lumière diffusée qui ne contient pas d'information sur le retard optique.
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