Thin optic surface analysis for high resolution X-ray telescopes

The art of glass developed throughout the years has covered artifacts ranging from crude ornaments to high precision optics used in flat panel displays, hard disk drives, and x-ray telescopes. Methods for manufacturing glass sheets and further sheet shaping processes are covered. Future generation, high resolution x-ray telescopes require thin optics with large surface area to thickness ratio and a surface flatness of -500 nm. A novel method utilizing porous ceramics, which provide a thin layer of air for sheet glass to rest on during the shaping process, is investigated. The shaping process involves slumping glass on a uniform layer of air at elevated temperatures, where the viscosity of glass is low enough for it to sag under its own weight and replicate the surface it rests on. Flow in porous, rectangular air bearings is covered with both flat and grooved surfaces. The pressure distribution in the air gap between the ceramic and the glass sheet determines the surface quality of glass during slumping. The mechanical integrity of porous ceramics at elevated temperatures is investigated to predict the effect of the decrease in ceramic stiffness on the final shape of the optic.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Mechanical Engineering.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2004

Author dc:creator

• Akilian, Mireille

Advisor dc:contributor.advisor

• Mark L. Schattenburg and Samir Nayfeh.

• Mechanical Engineering.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/34556

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/34556