Comparison of two high-precision nondestructive measurement methods for evaluating thermal expansion differences in the 8.3-m ultralow-expansion Subaru primary mirror blank

Details Comparison of two high-precision nondestructive measurement methods for evaluating thermal expansion differences in the 8.3-m ultralow-expansion Subaru primary mirror blank Comparison of two high-precision nondestructive measurement methods for evaluating thermal expansion differences in the 8.3-m ultralow-expansion Subaru primary mirror blank

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apopt..35.1126h&link_type=abstract

Applied Optics, Volume 35, Issue 7, March 1, 1996, pp.1126-1128

Other

Glass And Other Amorphous Materials, Imaging Systems, Instrumentation: Measurement: And Metrology, Materials, Mirrors, Nondestructive Testing, Optical Design And Fabrication, Optical Devices: Theory And Technology, Optical Fabrication, Telescopes

Scientific paper

The building blocks for fabricating the 8.3-m Subaru primary mirror blank are ultralow-expansin solid hexagonal units that were subjected to rigorous ultrasonic examination to establish thermal expansion characterization as reported by Hagy [Appl. Opt. 12, 1440 (1973)]. Following assembly of the mirror by fusion and fine annealing, photoelastic analyses at hex-to-hex seals were used to calculate thermal expansion differences. These differences are found to be in excellent agreement with the ultrasonically established differences.

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