Measurement of residual birefringence in thin glass plates using digital photoelasticity

P. Tarkes Dora; K. Ramesh

doi:10.1117/12.2054230

2 June 2014 Measurement of residual birefringence in thin glass plates using digital photoelasticity

P. Tarkes Dora, K. Ramesh

Proceedings Volume 9234, International Conference on Experimental Mechanics 2013 and Twelfth Asian Conference on Experimental Mechanics; 92340J (2014) https://doi.org/10.1117/12.2054230
Event: International Conference on Experimental Mechanics 2013 and the Twelfth Asian Conference on Experimental Mechanics, 2013, Bangkok, Thailand

Abstract

Residual stresses in glass causes it birefringent, affecting its optical properties. Annealed P-LASF47%trade; glass plates of 75 × 20 × 5 mm are subjected to two different thermal cycles. An automatic polariscope is used to employ Phase Shifting Technique (PST) to determine the residual integrated retardations over the thickness. Smaller field of view of the polariscope necessitates analysing the glass plate separately for the upper and lower regions of the glass plate. A code is developed in MATLAB to stitch the retardation data for the upper and lower region. The integrated retardation for the whole field is plotted as a contour plot using OriginPro software. Maximum retardation is observed in small regions at the free surfaces of the glass plate. It is noted that the nature of the thermal cycle has an influence on the retardation distribution.

Citation Download Citation

P. Tarkes Dora and K. Ramesh "Measurement of residual birefringence in thin glass plates using digital photoelasticity", Proc. SPIE 9234, International Conference on Experimental Mechanics 2013 and Twelfth Asian Conference on Experimental Mechanics, 92340J (2 June 2014); https://doi.org/10.1117/12.2054230

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