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

US11852549B2 · kind B2 · utility

Assignee

• CORNING INCORPORATED · US

Inventors

• Ryan Claude Andrews · Elmira, US
• David Matthew Berg · Rochester, US
• Pierre Michel Bouzi · Horseheads, US
• William John Furnas · Elmira, US
• Jacob Immerman · Corning, US
• Jeremiah Robert Jacobson · Corning, US
• Katherine Anne Lindberg · Corning, US
• Glenn Abram Newcomer · Pine City, US
• Evan Lewis Olson · Elmira, US
• Viktor Stepanov · Corning, US
• Nathaniel David Wetmore · Elmira, US

Key dates

• Filing date: Feb 21, 2022
• Grant date: Dec 26, 2023
• Expiry date: Apr 4, 2042

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2021/4792
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

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.