Experimental Studies of Stress Management by Optical Fluorescence
CALIFORNIA UNIV SANTA BARBARA DEPT OF MATERIALS
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In this program the measurement of stresses in ceramics using their optical fluorescence is being developed. The technique is based on the phenomena of piezospectroscopy, namely the shift in optical fluorescence of a material produced by a stress. In the course of the program to data we have derived for the first time a general relationship between an observed shift in fluorescence frequency and the state of stress, applied it to the determination of both applied and residual stresses in single crystal and polycrystalline materials, and begun to exploit the technique to the measurement of stresses in a variety of composite materials. These are described in detail in the accompanying technical reports appended here. As part of this investigation we have also found that in ruby Chromium3 doped sapphire the observed optical fluorescence shift as a function of chromium concentration is a direct measure of the image stress.
- Ceramics, Refractories and Glass