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STRESS MEASUREMENT DEVICE FOR STRENGTHENED GLASS, STRESS MEASURING METHOD FOR STRENGTHENED GLASS, MANUFACTURING METHOD OF STRENGTHENED GLASS, AND STRENGTHENED GLASS
STRESS MEASUREMENT DEVICE FOR STRENGTHENED GLASS, STRESS MEASURING METHOD FOR STRENGTHENED GLASS, MANUFACTURING METHOD OF STRENGTHENED GLASS, AND STRENGTHENED GLASS
A stress measurement device for strengthened glass includes a polarization phase difference variable member configured to vary a polarization phase difference of a laser light by one wavelength of the laser light or more; an imaging element configured to image a plurality of times at a predetermined time interval a scattered light emitted according to the laser light with the varied polarization phase difference entering the strengthened glass, and obtain a plurality of images; and an arithmetic unit configured to measure a periodic change in luminance of the scattered light using the plurality of images, calculate a change in a phase of the change in luminance, and calculate a stress distribution in a depth direction from a surface of the strengthened glass based on the change in the phase.
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