Review of measurement systems for evaluating thermal expansion homogeneity of Corning Code 7971 ULETM

Henry E. Hagy

doi:10.1117/12.48856

1 December 1991 Review of measurement systems for evaluating thermal expansion homogeneity of Corning Code 7971 ULE®

Henry E. Hagy

Proceedings Volume 1533, Optomechanics and Dimensional Stability; (1991) https://doi.org/10.1117/12.48856
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

Early on in the development of glass Code 7971 ULE^TM, Corning recognized that applications demanded thermal expansion measurements with higher precision and accuracy than that available. Hence a program was launched starting with 10cm path laser Fizeau interferometry to establish an absolute base. Differential methods followed with large sandwich seals and a high precision vitreous silica superdilatometer. Destructive in nature, these tests led to a nondestructive ultrasonic procedure that permits absolute and differential measurements with an uncertainty of +/- 2 ppb/ degree(s)C and reliably performed at the manufacturing plant. Details of these measurement systems are described along with optional experimental variations. A principle, established with seal testing, is reviewed showing that expansion differentials in ULE^TM are independent of temperature. Finally, recent plant measurements of both axial and radial thermal expansion variations in ULE^TM boules are presented.

Citation Download Citation

Henry E. Hagy "Review of measurement systems for evaluating thermal expansion homogeneity of Corning Code 7971 ULE®", Proc. SPIE 1533, Optomechanics and Dimensional Stability, (1 December 1991); https://doi.org/10.1117/12.48856

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KEYWORDS

Glasses

Ultrasonics

Optomechanical design

Silica

Vitreous

Error analysis

Calibration

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