Effects of accelerations and surface conditions on a pre-designed lightweight primary mirror

C. Y. Chan; Y. C. Cheng; S. T. Chang; T. M. Huang; M. Y. Hsu

doi:10.1117/12.892257

21 September 2011 Effects of accelerations and surface conditions on a pre-designed lightweight primary mirror

C. Y. Chan, Y. C. Cheng, S. T. Chang, T. M. Huang, M. Y. Hsu

Proceedings Volume 8127, Optical Modeling and Performance Predictions V; 81270F (2011) https://doi.org/10.1117/12.892257
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

Abstract

The effect of the acceleration force during launch on the primary mirror of a Cassegrain telescope has been studied in the paper. Finite element method and Zernike polynomial fitting are applied to the ZERODUR^R primary mirror with a predesigned lightweight configuration on the back. The relations between several selected surface treatment conditions and the mirror characteristic strength as well as the safety factors under various launch accelerations have been investigated. It is found that the surface treatment on the mirror surface needs to be at least ground using a D251 or finer tool to keep the load safety factor of the primary mirror structure of the telescope higher than 1.5 aerially. In addition the principle strss difference of the lightweight ZERODUR^R mirror induced by the grinding process with an average grain size of 149 μm is up to 1 MPa.

Citation Download Citation

C. Y. Chan, Y. C. Cheng, S. T. Chang, T. M. Huang, and M. Y. Hsu "Effects of accelerations and surface conditions on a pre-designed lightweight primary mirror", Proc. SPIE 8127, Optical Modeling and Performance Predictions V, 81270F (21 September 2011); https://doi.org/10.1117/12.892257

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available