Improved precision of absolute thermal-expansion measurements for ULE glass

Mary J. Edwards; Emily H. Bullock; Deborah E. Morton

doi:10.1117/12.258287

11 November 1996 Improved precision of absolute thermal-expansion measurements for ULE glass

Mary J. Edwards, Emily H. Bullock, Deborah E. Morton

Proceedings Volume 2857, Advanced Materials for Optical and Precision Structures; (1996) https://doi.org/10.1117/12.258287
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

Improvements made in the ultrasonic thermal expansion measurement methods used at Corning Incorporated have significantly increased the precision of absolute CTE measurements on ULE^TM glass. Precise CTE data were required for modeling the performance of 8-meter mirror blanks. Several repeatability and reproducibility studies for many of the measurements performed throughout the 8- meter process were performed. Measurement equipment and procedures were then improved to obtain the required precision. A volume of absolute CTE data collected during the manufacture of three 8-meter mirror blanks is summarized, showing excellent results. Comparison with previously demonstrated precision is also given.

Citation Download Citation

Mary J. Edwards, Emily H. Bullock, and Deborah E. Morton "Improved precision of absolute thermal-expansion measurements for ULE glass", Proc. SPIE 2857, Advanced Materials for Optical and Precision Structures, (11 November 1996); https://doi.org/10.1117/12.258287

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