Supertyndt spejl afprøves ved ESO
Dette enestående deformerbare tynde spejl er blevet leveret til ESO i Garching, Tyskland og ses her under afprøvning. Det er 1120 millimeter på tværs, men kun 2 millimeter tykt, hvilket gør det meget tyndere end de fleste glasvinduer. Spejlet er meget tyndt for at være fleksibelt nok til at kunne ændre formen af den reflekterende overflade når magnetiske kræfter påvirker det. Når det er i brug, vil spejlets overflade hele tiden blive ændret en lille smule for at korrigere for den udtværende effekt fra Jordens atmosfære og derved skabe meget skarpere billeder.
Det nye deformerbare sekundærspejl (Deformable Secondary Mirror: DSM) vil erstatte det nuværende sekundærspejl i et af VLTs fire enhedsteleskoper. Hele sekundærspejlets konstruktion omfatter en samling af 1170 aktuatorer, der påfører en kraft på 1170 magneter, som er limet på bagsiden af det tynde spejl. Avanceret, specialbygget elektronik styrer hvordan det tynde spejl opfører sig. Den reflekterende overflade kan deformeres op til tusind gange hvert sekund ved aktuatorernes påvirkning.
Det komplette DSM-system blev leveret til ESO af de italienske firmaer Microgate og ADS i december 2012 og markerer afslutningen på otte års vedvarende udviklingsarbejde og produktion. Det er det største deformerbare spejl, der nogen sinde er fremstillet til astronomi-formål og er det sidste i en lang række af sådanne spejle. Disse firmaers store erfaring ses i form af systemets store ydeevne og dets driftsikkerhed. Efter planen skal det installeres på VLT i begyndelsen af 2015.
Det tynde spejl (ann12015) blev fremstillet af det franske firma REOSC. Det er en plade af keramisk materiale er blevet poleret til en meget nøjagtig form. Produktionsprocessen begyndte med et stykke Zerodur-keramik, leveret af Schott Glass (Tyskland), der var mere end 70 millimeter tykt. Størstedelen af materialet blev slebet væk for at skabe det endelige tynde spejl, der forsigtigt skal støttes hele tiden, da det er ekstremt skrøbeligt.
Links
- Afdelingen for adaptiv optik ved ESO
- Brochure om Adaptive Optics Facility (AOF) på ESO (PDF-fil)
- Microgate
- ADS
- REOSC
- Schott Glass
ESO
Om billedet
| Id: | potw1307a |
| Sprog: | da |
| Type: | Foto |
| Udgivelsesdato: | 18. februar 2013 10:00 |
| Størrelse: | 5616 x 3744 px |
Om objektet
| Type: | Unspecified : Technology |
Billedformater
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