SYSTEMS AND METHODS FOR CHARACTERIZING HIGH-SCATTER GLASS-BASED SAMPLES USING LIGHT-SCATTERING POLARIMETRY
First Claim
1. A method of using light-scattering polarimetry to characterize an optical retardance of a glass-based sample, comprising:
- a. directing a light beam from a light source into the glass-based sample while varying a polarization of the light beam between at least first and second polarization states to generate scattered light for each polarization state;
b. for each of the at least first and second polarization states, capturing the scattered light with an image sensor having an exposure time tE and that captures frames at a frame rate FR, wherein the scattered light has an intensity distribution at the image sensor;
c. moving the sample at a sample speed SS relative to at least one of the light beam and the image sensor so that for each of the at least first and second polarization states, the image sensor averages two or more of the intensity distributions per frame to form an averaged intensity distribution; and
d. using the averaged intensity distribution for each of at least first and second polarization states to characterize the optical retardance.
1 Assignment
0 Petitions
Accused Products
Abstract
Methods of characterizing an optical retardance or a stress-related property of a glass-bases sample include directing a light beam into the glass-based sample while varying the polarization of the light beam to generate scattered light for each polarization are provided. The scattered light for each polarization is captured with an image sensor, 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 turn be used to determine stress-related properties of the glass-based sample. Moving the substrate reduces measurement noise scattered light having no optical retardance information.
3 Citations
20 Claims
-
1. A method of using light-scattering polarimetry to characterize an optical retardance of a glass-based sample, comprising:
-
a. directing a light beam from a light source into the glass-based sample while varying a polarization of the light beam between at least first and second polarization states to generate scattered light for each polarization state; b. for each of the at least first and second polarization states, capturing the scattered light with an image sensor having an exposure time tE and that captures frames at a frame rate FR, wherein the scattered light has an intensity distribution at the image sensor; c. moving the sample at a sample speed SS relative to at least one of the light beam and the image sensor so that for each of the at least first and second polarization states, the image sensor averages two or more of the intensity distributions per frame to form an averaged intensity distribution; and d. using the averaged intensity distribution for each of at least first and second polarization states to characterize the optical retardance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method of determining a stress-based characteristic of a glass-based sample using light-scattering polarimetry, comprising:
-
operably arranging the glass-based sample in or relative to a polarimeter having an image sensing device, a light source that emits a light beam, and an optical compensator that defines at least first and second polarizations of the light beam; while moving the glass-based sample relative to the at least one of the light source and the image sensing device, directing the light into the glass based sample to generate scattered light that forms at the image sensing device a line image having a time-varying intensity distribution; for each of the first and second polarizations, detecting with the image sensing device at least two substantially different intensity distributions; forming an averaged intensity distribution from the at least two substantially different intensity distributions; calculating an optical retardation using the averaged intensity distributions for the at least first and second polarizations; and determining the at least one stress-based characteristic from the optical retardation. - View Dependent Claims (10, 11, 12, 13, 14)
-
-
15. A method of measuring at least one stress-based characteristic of a glass-based sample having a body, comprising:
-
a. performing a polarimetry measurement of the glass-based sample for at least first and second polarization states of light having a wavelength λ and
transmitted into the body of the sample to generate scattered light;b. during act a), detecting for each of the at least first and second polarization states at least first and second light distributions of the scattered light from different portions of the body and averaging the at least first and second light distributions to form an averaged light distribution; c. using the averaged light distribution for each of the first and second polarization states to calculate an optical retardance as a function of depth into the body of the glass-based sample; and d. using the calculated optical retardance to determine the at least one stress-based characteristic of the glass-based sample. - View Dependent Claims (16, 17, 18, 19, 20)
-
Specification