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11 November 1996 Improved precision of absolute thermal-expansion measurements for ULE glass
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Abstract
Improvements made in the ultrasonic thermal expansion measurement methods used at Corning Incorporated have significantly increased the precision of absolute CTE measurements on ULETM 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.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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