Surface refractive index measurement method and surface stress measurement method using the same
US10859452B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 27, 2018 |
| Grant date | Dec 8, 2020 |
| Priority date | — |
| Expiry date | Jul 5, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/434
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed is a method of measuring a surface refractive index of a strengthened glass including causing light to enter a surface layer of the strengthened glass through a liquid provided with a refractive index equivalent to that of a surface of the surface layer; a process of causing the light to be emitted from the strengthened glass through the liquid; converting two types of light components into two types of emission line sequences; capturing an image of the two types of emission line sequences; measuring positions of respective emission lines of the two types of emission line sequences from the image; and calculating refractive indexes of a surface of the strengthened glass corresponding to the two types of light components, or refractive index distributions of the strengthened glass in a depth direction from the surface corresponding to the two types of light components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.