Patent ID: 11860090
Assignee: CORNING INCORPORATED
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A method of performing a stress measurement of a chemically strengthened glass using a light-scattering polarimetry (LSP) system having a light source system that emits a light beam, an optical compensator and a digital detector with an integration time tI, comprising:
a) adjusting the intensity of a light beam 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 tR by aligning the first polarizer with a second polarizer in the optical compensator to have matching polarization directions by rotating the rotatable half-wave plate to a position where the exposure time tE falls within an exposure range tR≤tE; and
b) performing an exposure using the exposure time tE to obtain the stress measurement.