Patent ID: 9109881
Filing Date: 2015-08-18
Classification: C03C,G01B,G01L,G01N

Abstract:
1. A method of characterizing a compressive stress of a double ion-exchanged (DIOX) glass sample having a surface and a base refractive index n s , comprising: wetting either a coupling surface of a coupling prism of refractive index n interfacing the coupling prism to the surface of the DIOX sample to define a prism-sample interface having input and output ends, with the interfacing fluid residing between the coupling prism and the DIOX sample surface, wherein n where λ is a wavelength of measuring light; illuminating the prism-sample interface with the measurement light, wherein the measurement light has an intensity gradient that increases in the direction from the input to the output end of the prism-sample interface; digitally capturing TE and TM mode spectra reflected from the prism-sample interface; and processing the TE and TM mode spectra to determine the compressive stress of the DIOX sample.