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	~~Hello~~. ~~Let me introduce~~ the ~~author~~. ~~Her name~~ is ~~Emilia Shroyer but it~~'s not the ~~most female title out there~~. To ~~collect cash is what her family members and her appreciate. California is our beginning place. For years he's been working as~~ a ~~meter reader and it's some thing he truly appreciate.~~<br><br>~~My webpage .~~.. [~~http://rtdcs~~.~~hufs~~.ac.~~kr/?document_srl~~=~~780411 at home std test~~]		In astronomy, the term '''cophasing''' or '''phasing''' describes the process of controlling the individual segments in a [[segmented mirror]] or a telescope so that the segments form a larger composite mirroring surface. Cophasing implies precise, active control of three [[Degrees of freedom (mechanics)\|degrees of freedom]] of each individual segment mirror: translation along the [[optical axis]] (piston) and rotation about two axes perpendicular to the optical axis (tip-tilt).

			Each segment of the segmented [[telescope]] is a solid body having 6 degrees of freedom exposed to the [[Newton's law of universal gravitation\|gravitation force]], wind blowing, and other mechanical forces. If the position of each segment is not controlled the [[Optical resolution\|resolution]] of the whole telescope will be the same as if telescope had the diameter equal to the size of one segment. To achieve a resolution commensurable with that of a monolithic telescope of the same diameter the segmented surface must be controlled with a precision better than <math>\lambda/40</math> surface rms.

			Projects for future [[extremely large telescope]]s (ELTs) generally depend on the use of a segmented primary mirror. While the basic technologies required for segmented telescopes have been demonstrated for the 10m [[W. M. Keck Observatory\|Keck telescope]] or [[Gran Telescopio Canarias\|GTC telescope]], ELTs of diameters form 50 to 100 m represent a qualitative change with respect to wave front control related to segmentation in comparison with the current 10 meters technology.

			==References==
			{{Unreferenced\|date=May 2009}}

			[[Category:Telescopes]]

en>Helpful Pixie Bot: ISBNs (Build KE)

2012-05-11T16:01:16Z

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Hello. Let me introduce the author. Her name is Emilia Shroyer but it's not the most female title out there. To collect cash is what her family members and her appreciate. California is our beginning place. For years he's been working as a meter reader and it's some thing he truly appreciate.<br><br>My webpage ... [http://rtdcs.hufs.ac.kr/?document_srl=780411 at home std test]

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en>Saviourmachine: Add source

en>Helpful Pixie Bot: ISBNs (Build KE)