Manufacture of segments for extremely large telescopes: a new perspective

David D. Walker; Paul R. Shore

doi:10.1117/12.566274

7 July 2004 Manufacture of segments for extremely large telescopes: a new perspective

David D. Walker, Paul R. Shore

Proceedings Volume 5382, Second Backaskog Workshop on Extremely Large Telescopes; (2004) https://doi.org/10.1117/12.566274
Event: Second Backaskog Workshop on Extremely Large Telescopes, 2003, Backaskog, Sweden

Abstract

We consider the production-route for aspheric segments for extremely large telescopes. The classical stressed-mirror polishing route followed by ion-figuring is introduced, leading to consideration of a new route combining precision aspheric grinding with computer-controlled polishing. We present estimates of process times in the polishing and grinding phases, based on scaling previous experimental results, and outline the next stage of the process development project. We are optimistic that the new route will be capable of faster processing with reduced risk, and will free the telescope and enclosure designers from the dimensional constraints imposed by segment asphericity.

Citation Download Citation

David D. Walker and Paul R. Shore "Manufacture of segments for extremely large telescopes: a new perspective", Proc. SPIE 5382, Second Backaskog Workshop on Extremely Large Telescopes, (7 July 2004); https://doi.org/10.1117/12.566274

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