Abstract
We developed a nondestructive and noncontact method for measuring
stress at the midplane of tempered glass plates that uses Bragg
scattering from a pair of thermal gratings. These gratings are
formed by 1064-nm beams from a seeded Nd:YAG laser, and we measure the
polarization state of light from a 532-nm beam that scatters from both
thermal gratings. The change in polarization of the doubly
scattered light with separation between the two gratings allows
measurement of the in-plane stress. A model of the Bragg scattering
efficiency, experimental investigations of the scattered beams, and
stress measurements are reported.
© 2001 Optical Society of America
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