Super cienkie lustro na testach w ESO

To nadzwyczajnie deformowalne cienkie lustro zostało dostarczone do ESO w Garching w Niemczech, gdzie przechodzi różne testy. Mierzy 1120 milimetrów średnicy, ale ma zaledwie 2 milimetry grubości, co czyni je znacznie cieńszym niż większość szklanych okien. Zwierciadło jest bardzo cienkie, tak aby było wystarczająco elastyczne dla sił magnetycznych wywieranych na nie w celu zmiany kształtu powierzchni odbijającej. W trakcie użycia powierzchnia zwierciadła będzie nieustannie zmieniana, aby korygować zaburzające efekty od ziemskiej atmosfery i tworzyć znacznie ostrzejsze obrazy.

Nowe deformowalne lustro wtórne (DSM - deformable secondary mirror) zastąpi obecnie używane w jednym z czterech głównych teleskopów VLT. Cała struktura z lustrem wtórnym obejmuje zestaw 1170 siłowników, które wywierają siłę na 1170 magnesów przyczepionych do tylnej powierzchni cienkiej powłoki. Skomplikowana elektronika specjalnego przeznaczenia kontroluje zachowanie cienkiej powłoki zwierciadła. Powierzchnia odbijająca może być deformowana do tysiąca razy na sekundę dzięki akcji siłowników.

Kompletny system DSM został dostarczony do ESO przez włoskie firmy Microgate oraz ADS w grudniu 2012 r. i jest zwieńczeniem ośmiu lat zrównoważonych prac rozwojowych i przemysłowych. Jest to największe deformowalne zwierciadło wyprodukowane kiedykolwiek dla celów astronomicznych i jest najnowszych z długiej linii tego typu zwierciadeł. Bogate doświadczenie wykonawców uwidoczniło się w wysokiej wydajności systemu i jego niezawodności. Zainstalowanie na VLT jest planowane na rok 2015.

Powłoka zwierciadła (ann12015) została wyprodukowana przez francuską firmę REOSC. Obejmuje powłokę z materiału ceramicznego, która została wypolerowana do bardzo dokładnego kształtu. Proces produkcji rozpoczął się od bloku ceramiki Zeroduj, dostarczonego przez Schott Glass (Niemcy), który miał ponad 70 milimetrów grubości. Większość materiału została usunięta, aby utworzyć finalną cienką warstwę, która musi być przez cały czas starannie obsługiwana, gdyż jest bardzo nietrwała.

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Data publikacji:18 lutego 2013 10:00
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