Emhart Glass S.a.

Corning Incorporated

Other

William John Furnas

Gary Carl Weber

Ryan Claude Andrews

Nathaniel David Wetmore

Jeremiah Robert Jacobson

Sarath K Tennakoon

Evan Lewis Olson

Pierre Michel Bouzi

Jacob Immerman

Ekaterina Aleksandrovna Kuksenkova

Sumalee Likitvanichkul Fagan

Katherine Anne Lindberg

Glenn Abram Newcomer

Viktor Stepanov

Jin Su Kim

Rostislav Vatchev Roussev

Richard D Diehr

Babak Robert Raj

Stephen Matthew Giometti

Mark P Claypool

David Matthew Berg

Balamurugan Meenakshi Sundaram

Sarath K Tennekoon

Robert A Shultz

Saeid Zakeri

Disclosed herein are glass-based articles having a first surface having an edge, wherein a maximum optical retardation of the first surface is at the edge and the maximum optical retardation is less than or equal to about 40 nm and wherein the optical retardation decreases from the edge toward a central region of the first surface, the central region having a boundary defined by a distance from the edge toward a center point of the first surface, wherein the distance is ½ of the shortest distance from the edge to the center point.

Glass-based article with engineered stress distribution and method of making same

Systems and methods of performing a stress measurement of a chemically strengthened glass using a light-scattering polarimetry system include adjusting the intensity of a light beam from a light source in an illumination system using a rotatable half-wave plate and a first polarizer operably disposed between the light source and a rotating light diffuser that has a rotation time t. The first polarizer is aligned with a second polarizer in a downstream optical compensator to have matching polarization directions by rotating the rotatable half-wave plate to a position where the exposure time tfalls within an exposure range t≤t. The method also includes performing an exposure using the exposure time tto obtain the stress measurement. One or both of the half-wave plate and first polarizer can be tilted to avoid deleterious back-reflected light from entering the light source.

Light source intensity control systems and methods for improved light scattering polarimetry measurements

The hybrid measurement system includes an evanescent prism coupling spectroscopy (EPCS) sub-system and a light-scattering polarimetry (LSP) sub-system. The EPCS sub-system includes an EPCS light source system optically coupled to an EPCS detector system through an EPCS coupling prism. The LSP sub-system includes an LSP light source optically coupled to an optical compensator, which in turn is optically coupled to a LSP detector system via a LSP coupling prism. A support structure supports the EPCS and LSP coupling prisms to define a coupling prism assembly, which supports the two prisms at a measurement location. Stress measurements made using the EPCS and LSP sub-systems are combined to fully characterize the stress properties of a transparent chemically strengthened substrate. Methods of processing the EPCS and LSP measurements and enhanced configurations of the EPCS and LPS sub-systems to improve measurement accuracy are also disclosed.

Enhanced hybrid systems and methods for characterizing stress in chemically strengthened transparent substrates

Apparatus can comprise a cavity at least partially defined by a first major surface of a reference block and configured to receive a sample. The apparatus can comprise a first polarization-switching light source configured to emit a first polarization-switched light beam toward the cavity and a first detector configured to detect a corresponding signal. The apparatus can comprise a second polarization-switching light source configured to emit a second polarization-switched light beam toward the cavity and a second detector configured to detect a corresponding signal. The first reference block can be positioned between the second detector and the second reference block. Methods of determining an estimated stress profile can comprise determining a central tension from a measured retardation profile of the sample. Methods can comprise determining an initial stress profile from a refractive index profile of the sample. Methods can comprise scaling and adjusting stress profiles.

Apparatus and method for determining refractive index, central tension, or stress profile

The hybrid measurement system includes an evanescent prism coupling spectroscopy (EPCS) sub-system and a light-scattering polarimetry (LSP) sub-system. The EPCS sub-system includes an EPCS light source optically coupled to an EPCS detector system through an EPCS coupling prism. The LSP sub-system includes an LSP light source optically coupled to an optical compensator, which in turn is optically coupled to a LSP detector system via a LSP coupling prism. A support structure supports the EPCS and LSP coupling prisms to define a coupling prism assembly, which supports the two prisms at a measurement location. Stress measurements made using the EPCS and LSP sub-systems are combined to fully characterize the stress properties of a transparent chemically strengthened substrate. Methods of processing the EPCS and LSP measurements to improve measurement accuracy are also disclosed.

Hybrid systems and methods for characterizing stress in chemically strengthened transparent substrates

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.

Systems and methods for characterizing high-scatter glass-based samples using light-scattering polarimetry

Provided herein are systems and methods for monitoring radial stresses in glass tubing. In some embodiments, a measurement system includes a light source delivering a light to a tube, and a polarizer receiving the light after the light is refracted through a wall of the tube. The measurement system may further include a detector receiving the light from the polarizer, the detector operable to capture a first image of the light at a first polarization state and a second image of the light at a second polarization state. The system may further include a controller operable to determine a retardation profile related to the stress profile of the wall of the tube by determining a retardation magnitude of the light refracted through the wall of the tube based on a difference between the first image of the light and the second image of the light.

Retardation profile for stress characterization of tubing

Disclosed herein are glass-based articles having a first surface having an edge, wherein a maximum optical retardation of the first surface is at the edge and the maximum optical retardation is less than or equal to about 40 nm and wherein the optical retardation decreases from the edge toward a central region of the first surface, the central region having a boundary defined by a distance from the edge toward a center point of the first surface, wherein the distance is &#xbd; of the shortest distance from the edge to the center point.

Optical inspection systems and methods for inspecting a glass sheet for defects are disclosed. The systems and methods employ a digital camera and a plurality of different types of illumination sources. The object plane of the digital camera moves through the glass sheet body while flash exposures from one or more of the illumination sources are performed. The movement occurs during a ready-to-acquire time of the digital camera. This allows the digital camera to capture a plurality of digital inspection images on the fly at different exposure positions within the glass sheet body without waiting for any digital image processing to occur. The digital inspection images are then reviewed to characterize any revealed defects.

Glass-sheet optical inspection systems and methods with illumination and exposure control

An apparatus and method for measurement of the stress in and thickness of the walls of glass containers is disclosed that uses fluorescence to quickly and accurately ascertain both the thickness of the stress layers and the wall thickness in addition to the stress curve in glass containers. The apparatus and method may be used to quickly and accurately measure both the stress in and the thickness of the side walls of glass containers throughout the circumference of the glass containers. The apparatus and method are adapted for large scale glass container manufacturing, and are capable of high speed measurement of the stress in and the thickness of the side walls of glass containers.

Glass container stress measurement using fluorescence

An apparatus and method for measurement of the stress in and thickness of flat glass or curved glass segments is disclosed that uses fluorescence to quickly and accurately ascertain both the thickness of the stress layers and the wall thickness in addition to the stress curve in flat glass or curved glass segments. The apparatus and method may be used to quickly and accurately measure both the stress in and the thickness of flat glass or curved glass segments at a plurality of various locations therein. The apparatus and method are adapted for large scale flat glass or curved glass segment manufacturing, and are capable of high speed measurement of the stress in and the thickness of the flat glass or curved glass segments.

Glass thickness measurement using fluorescence

Glass stress measurement using fluorescence

Glass container wall thickness measurement using fluorescence

A machine is disclosed for inspecting the wall of a bottle which is delivered by a conveyor sequentially to an inspection station. A light source defines a plurality of vertical row groups each having no black row, a white row and a plurality of adjacent rows where the intensity systematically decreases to a lowest level where light blocking defects can be seen and than increases systematically to the next white row.

Container inspection machine using light source having spatially cyclically continuously varying intensity

An inspection machine for determining whether a bottle at an inspection station is 'out of round'. A laser, spaced from the bottle to be inspected directs a laser beam towards the axis of the bottle to be inspected whereby a diffuse spot of energy will be defined on the surface of the bottle to be inspected. The bottle to be inspected is rotated about its axis and a CCD camera views the spot of energy on the surface of the bottle at a defined angle to the laser beam. A control determines the displacement of the spot of energy as the bottle to be inspected is rotated 360 degrees about its axis and issues a reject signal in the event the displacement exceeds a set limit.

Growing community of inventors

Elmira, NY, United States of America

William John Furnas