High precision photoelastic and ultrasonic techniques for determining absolute and differential thermal expansion of titania-silica glasses.

@article{Hagy1973HighPP,
  title={High precision photoelastic and ultrasonic techniques for determining absolute and differential thermal expansion of titania-silica glasses.},
  author={H E Hagy},
  journal={Applied optics},
  year={1973},
  volume={12 7},
  pages={1440-6}
}
Photoelastic analysis of a large fused sandwich seal, composed of two glasses with slight composition differences, permits reliable measurement of the thermal expansion difference to 0.0002 ppm/ degrees C. If the expansion of one of the glasses is known, the method becomes absolute. For the titania-silica system, it is shown that for any two compositions with small titania differences the expansion coefficient differential remains constant from -195 degrees C to 925 degrees C. A direct… CONTINUE READING