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Title: Confocal detection of Rayleigh scattering for residual stress measurement in chemically tempered glass

A new optical method is presented for evaluation of the stress profile in chemically tempered (chemically strengthened) glass based on confocal detection of scattered laser beam. Theoretically, a lateral resolution of 0.2 μm and a depth resolution of 0.6 μm could be achieved by using a confocal microscope with high-NA immersion objective. The stress profile in the 250 μm thick surface layer of chemically tempered lithium aluminosilicate glass was measured with a high spatial resolution to illustrate the capability of the method. The confocal method is validated using transmission photoelastic and Na{sup +} ion concentration profile measurement. Compositional influence on the stress-optic coefficient is calculated and discussed. Our method opens up new possibilities for three-dimensional scattered light tomography of mechanical imaging in birefringent materials.
Authors:
; ; ; ;  [1] ;  [2]
  1. Institute of Physics, University of Tartu, Wilhelm Ostwald st., Tartu 50411 (Estonia)
  2. Nippon Electric Glass Co., 7-1 Seiran 2-chome, Otsu-shi, Shiga 520-8639 (Japan)
Publication Date:
OSTI Identifier:
22493083
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 24; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABUNDANCE; BIOMEDICAL RADIOGRAPHY; GLASS; LASER RADIATION; LAYERS; LITHIUM COMPOUNDS; MICROSCOPES; RAYLEIGH SCATTERING; RESIDUAL STRESSES; SODIUM IONS; SPATIAL RESOLUTION; THREE-DIMENSIONAL CALCULATIONS; TOMOGRAPHY