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valy

01 Oct 2012 17:41



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http://www.astro.caltech.edu/palomar/AO/

By projecting a laser into the sky astronomers can create an artificial laser-guide star for use in adaptive optics wherever they see fit. To do so, they shine a narrow sodium laser beam up through the atmosphere. At an altitude of about 60 miles, the laser beam makes a small amount of sodium gas glow. The reflected glow from the glowing gas serves as the artificial guide star for the adaptive-optics system. The laser beam is too faint to be seen except by observers very close to the telescope, and the guide star it creates is even fainter. It can't be seen with the unaided eye, yet it is bright enough to allow astronomers to make their adaptive-optics corrections. 

Dar asta tot nu rezolva problema. Laserul inlocuieste steaua cand nu ai una prin preajma, dar tot imi trebuie un dispozitiv de masurat abaterea data de seeing. Deci zici ca nu exista solutie ieftina?