Anúncio
ESO adjudica contrato para espelhos de concha deformável para o E-ELT
8 de Julho de 2015
O ESO assinou um contrato com a companhia de óptica francesa Reosc, uma subsidiária da Sagem, do grupo Safran, para a construção dos espelhos de concha deformável que constituirão o quarto espelho (M4) do European Extremely Large Telescope (E-ELT). Estes espelhos serão montados e apoiados pela unidade de espelho adaptativo (ann15045), formando assim o maior espelho adaptativo alguma vez construído.
O contrato foi assinado por representantes da Reosc e do ESO numa cerimónia que teve lugar na Sede do ESO a 8 de julho de 2015.
O sistema de espelho deformável M4 é a peça chave do E-ELT. Com 2,4 metros de diâmetro, o espelho será composto por seis segmentos de vidro cerâmico finos, cada um com apenas 1,95 milímetros de espessura. Cada concha é uma de seis secções em pétala de 60º que formarão o espelho segmentado circular M4.
A SCHOTT entregará as peças de cerâmica à Reosc, que depois fabricará e polirá as conchas finas. O consórcio AdOptica em Itália — ADS International e Microgate, em parceria com o INAF (Istituto Nazionale di Astrofisica) como subempreiteiros — fará a montagem das conchas e construirá toda a unidade de apoio (ann15045).
A preparação de protótipos deste espelho complexo durou vários anos. A Reosc fabricou o primeiro espelho fino plano para o programa E-ELT já em 2008. Este espelho de 1 metro de diâmetro e 1,95 milímetros de espessura foi depois cortado em duas pétalas e usado para o protótipo de demonstração [1]. Em 2010, a Reosc conseguiu fabricar um espelho fino de vidro borossilicato de 2,7 metros de diâmetro e cortá-lo em segmentos.
Em 2011, a Reosc entregou a primeira concha fina para o espelho deformável do Very Large Telescope (VLT). Este espelho asférico (ann12015) foi revestido e integrado na unidade de suporte e tem estado a ser testado no ESO desde o final de 2012 (potw1307a). Um segundo espelho de concha fina para o espelho secundário deformável do VLT foi entregue no final de 2013 (ann14010) e será testado no ESO no início de 2016.
A Reosc fabricará doze conchas de espelho para o M4 do E-ELT, prevendo-se a construção das primeiras seis nos próximos 5 anos e devendo a construção dos doze espelhos estar concluída até 2023.
Notas
[1] A pétala instalada no protótipo de demonstração pode ser vista nesta fotografia.
Links
- Assinado contrato para o design final e construção do maior espelho adaptativo do mundo
- ESO adjudica contrato para o estudo do projeto do espelho adaptativo para o E-ELT
- O M4 do E-ELT (Microgate)
- Uma vista expansiva do Universo – Ciência com o European Extremely Large Telescope
- Design óptico do E-ELT
- Resumo da optomecâmica do E-ELT (M. Cayrel)
- Especificações e design do espelho adaptativo M4 do E-ELT (E. Vernet et al.)
Contactos
Elise Vernet
ESO, Adaptive Optics Department (Instrumentation)
Garching bei München, Alemanha
Tel: +49 89 320 06 322
Fax: +49 89 320 2362
Email: evernet@eso.org
Lars Lindberg Christensen
Head of ESO ePOD
Garching bei München, Alemanha
Tel: +49 89 3200 6761
Telm: +49 173 3872 621
Email: lars@eso.org
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| Id: | ann15055 |
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