Prototype segments polishing and testing for ELT M1

Rodolfo, Jacques; Chouarche, Laurent; Chaussat, Gilles; Hamy, Anne-Laure; Carel, Jean-Louis; Pernet, Bruno; Billet, Jacques; Leplan, H.; Ruch, Eric

doi:10.1117/12.925417

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…Sagem (France), through its Reosc department has also started polishing and testing prototypes segments for the ELT-M1 (see Rodolfo et al, 2012, at this conference).…”

Section: Off-axis Telescope New Conceptmentioning

confidence: 99%

Reviewing off-axis telescope concepts: a quest for highest possible dynamic range for photometry and angular resolution

2012

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We review off-axis telescope concepts that use unobstructed pupils. Built and prospective telescopes for ground and space astronomy will be presented and discussed. Such concepts offer great advantages in terms of emissivity, throughput, diffraction-limited energy concentration and higher dynamic range. The coronagraphic performance of off-axis telescopes will enable instruments, which are starving for higher dynamic range, for example, those devoted to faint companion detection and solar studies. Smaller telescopes like SOLAR-C (IfA/Haleakala Observatory), and the New Solar Telescope (NST/NJIT/ Big Bear Observatory) are operational and are test beds for the Advanced Technology Solar Telescope (ATST Project) for which site construction is beginning on Haleakala.

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“…Sagem (France), through its Reosc department has also started polishing and testing prototypes segments for the ELT-M1 (see Rodolfo et al, 2012, at this conference).…”

Section: Off-axis Telescope New Conceptmentioning

confidence: 99%

Reviewing off-axis telescope concepts: a quest for highest possible dynamic range for photometry and angular resolution

2012

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“…The useful area of the segment is defined as whole the polished area up to the edge. The prototyping activities have shown that the segments can be produced with no edge distortion 7,8 .…”

Section: Performancementioning

confidence: 99%

E-ELT optomechanics: overview

Cayrel¹

2012

SPIE Proceedings

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The E-ELT is a project led by the European Southern Observatory (ESO) for a 40-m class optical, near-and midinfrared, ground-based telescope. When it will enter into operation, the E-ELT will be the largest and most powerful optical telescope ever built. It will not only offer unrivalled light collecting power, but also exceedingly sharp images, thanks to its ability to compensate for the adverse effect of atmospheric turbulence on image sharpness.The basic optical solution for the EELT is a folded three-mirror anastigmat, using a 39-m segmented primary mirror (M1), a 4-m convex secondary mirror (M2), and a 4-m concave tertiary mirror (M3), all active. Folding is provided by two additional flat mirrors sending the beams to either Nasmyth foci along the elevation axis of the telescope. The folding arrangement (flat M4 and M5 mirrors) is conceived to provide conveniently located flat surfaces for an adaptive shell (M4) and field stabilization (M5).That paper provides an overview of the specifications, design, and expected performance of the E-ELT optical systems.

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“…The most critical parts of polishing and tests have been demonstrated in the polishing and measurement of a 1.7m off-axis prototype and the primary mirror for the New Solar Telescope (NST) (see Martin et al, 2012, at this conference). Sagem (France), through its Reosc department has also started polishing and testing prototypes segments for the ELT-M1 (see Rodolfo et al, 2012, at C NPT -New Planetary Telescope, a 6.5m off-axis telescope design study, encompassing many of the mechanical, optical fabrication issues, and facility concerns, has been undertaken by a NPT study group that was organized by the Institute for Astronomy and the Infrared Telescope Facility (IRTF) during 1999. To support the NASA mission, the primary objectives of the NPT are studies of Kuiper Belt objects, near-Earth objects, and direct support of space missions such as Cassini.…”

Section: An Off-axis Telescope For Dome Cmentioning

confidence: 99%