Correlation of RTV properties to test data and its effect on the AXAF mirror performance

Simon Chia-Fu Sheng; Oscar Berendsohn; Martin R. Schreibman; Lester M. Cohen

doi:10.1117/12.22826

1 November 1990 Correlation of RTV properties to test data and its effect on the AXAF mirror performance

Simon Chia-Fu Sheng, Oscar Berendsohn, Martin R. Schreibman, Lester M. Cohen

Proceedings Volume 1333, Advanced Optical Manufacturing and Testing; (1990) https://doi.org/10.1117/12.22826
Event: 34th Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1990, San Diego, CA, United States

Abstract

Using RTV rubber as an interface between mirror elements and their supporting structures during grinding and polishing was proposed for the Advanced X-ray Astrophysics Facility (AXAF) for glass safety concerns. This paper shows that the mirror performance is quite sensitive to the compression modulus of GE RTV-60 which, like all other rubber-like materials, is very difficult to characterize by testing and even more difficult to characterize analytically. Consequently, using representative RTV properties in mirror analyses only produces nominal performance predictions. The envelope of the range of performance has to be determined by using both extremes of the RTV compression modulus. This paper also presents a comparison between compression moduli generated via testing and that from semi-empirical formulas. The agreement is satisfactory when mean values of the test data are used for comparison and the shape factor is modified to include partially constrained surfaces. The scatter ranges from 7.6% to 23.0% depending upon the way the RTV samples were cast. Using an error of about 16.2, we were still able to meet the error budget requirements for the Glass Support Fixture (GSF).

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Simon Chia-Fu Sheng, Oscar Berendsohn, Martin R. Schreibman, and Lester M. Cohen "Correlation of RTV properties to test data and its effect on the AXAF mirror performance", Proc. SPIE 1333, Advanced Optical Manufacturing and Testing, (1 November 1990); https://doi.org/10.1117/12.22826

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KEYWORDS

Mirrors

Polishing

Glasses

Optical testing

Optics manufacturing

Data modeling

Finite element methods

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