Design and fabrication of a 3m class light weighted mirror blank for the E-ELT M5

Ralf Jedamzik; Volker Seibert; Armin Thomas; Thomas Westerhoff; Michael Müller; Marc Cayrel

doi:10.1117/12.891521

26 September 2011 Design and fabrication of a 3m class light weighted mirror blank for the E-ELT M5

Ralf Jedamzik, Volker Seibert, Armin Thomas, Thomas Westerhoff, Michael Müller, Marc Cayrel

Proceedings Volume 8126, Optical Manufacturing and Testing IX; 812607 (2011) https://doi.org/10.1117/12.891521
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

Abstract

In the recent past, SCHOTT has demonstrated its ability to manufacture large light weighted ZERODUR® mirror blanks for telescope projects like the GREGOR solar-telescope, for example. In 2010, SCHOTT was commissioned with a study aimed at developing a design for the M5 mirror blank of the ESO E-ELT. The tip and tilt M5 mirror of the European Extremely Large Telescope (E-ELT) requires a demanding approach in light weighting. The approximately 3.1 m x 2.5 m elliptical plano mirror is specified to a weight of less than 500 kg with high Eigenfrequencies and low deformation under different inclination angles. The study was divided into two parts. The first part focused on coming up with an optimized light weighted design with respect to performance and processability with finite element modeling. In the second part of the study, a concept for the processing sequence including melting, cold-processing, acid etching and handling of the M5 blank was developed. By producing a prototype section, SCHOTT demonstrated its ability to manufacture the demanding features, including pockets 350 mm in depth, thin walls and sloped pocket bottoms. This paper outlines the results of the design work, processing concept and demonstrator fabrication.

Citation Download Citation

Ralf Jedamzik, Volker Seibert, Armin Thomas, Thomas Westerhoff, Michael Müller, and Marc Cayrel "Design and fabrication of a 3m class light weighted mirror blank for the E-ELT M5", Proc. SPIE 8126, Optical Manufacturing and Testing IX, 812607 (26 September 2011); https://doi.org/10.1117/12.891521

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

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
11 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Mirrors

Manufacturing

Telescopes

Etching

Finite element methods

Minerals

Large telescopes

Show All Keywords

Keywords/Phrases

Search In:

Publication Years