Carbon fibre composite deformable mirrors: developments at UCL

Kendrew, Sarah; Doel, P.; King, Andrew; Dorn, Chris; Dwan, Richard Martin; Yates, Chris; Dando, Glyn C.; Richardson, I.M.; Evans, Glynn

doi:10.1117/12.669808

Cited by 2 publications

(1 citation statement)

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“…The Optical Science Laboratory at UCL has been investigating different types of carbon-fibre composite mirror for use in optical applications for over 5 years. Initial prototypes were stiffer, actively controlled mirrors composed of an electroformed nickel face-plate bonded to a carbonfibre-aluminium honeycomb sandwich [3,4]. More recent developments have been towards adaptive mirrors made from thin carbon composite cores and electroplated in nickel to provide the reflective surface [5,6].…”

Section: Introductionmentioning

confidence: 99%

A 1-metre Ni coated CFRP demonstrator for large deformable mirrors

Thompson

Doel

Strangwood

2010

1st AO4ELT Conference - Adaptive Optics for Extremely Large Telescopes

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Abstract. We present results from our current project to develop an alternative substrate for large deformable mirrors, particularly with the European Extremely Large Telescope (E-ELT) in mind. Our mirror substrate consists of a carbon-fibre reinforced polymer (CFRP) core encapsulated in a thick (50µm) coating of nickel; the coating entirely covers the CFRP front, back and edges. The benefits of CFRP are: that it has high tensile strength, making it exceptionally resistant to breakage and able to withstand high inter-actuator forces; that it can be fabricated in large sections, allowing the production of a 2.6 m monolithic mirror, simplifying system control and eliminating additional diffraction/scattering introduced by segmented mirror systems; its low density ( < 1800 kgm −3 for a Ni coated substrate). By the end of summer this year (2009) we aim to have constructed a 19 cm diameter fully actuated (37 piezo-stack actuators on a 29 mm triangular grid) prototype and a 1.0 m diameter substrate mounted on a static set of points to demonstrate the scalability of the technology. We discuss the processes involved in forming a Ni-CFRP mirror, the results obtained so far and a current status update.

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Section: Introductionmentioning

confidence: 99%

A 1-metre Ni coated CFRP demonstrator for large deformable mirrors

Thompson

Doel

Strangwood

2010

1st AO4ELT Conference - Adaptive Optics for Extremely Large Telescopes

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Solving, analyzing, manufacturing, and experimental testing of thickness distribution for a cycloid-like variable curvature mirror

Xie

Wang

et al. 2021

Opt. Express

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A cycloid-like variable curvature mirror (VCM) for zoom-imaging systems was investigated. An analytical-deformation solution to a thin-elastic plate with a cycloid-like thickness distribution and simply supported boundary condition under uniform pressure was found using a small parameter method. The finite-element analysis of the thin-elastic plate and designed VCM showed a good correlation with the analytical solution. The VCM was manufactured and polished to the initial shape with a root mean square (RMS) of 1/80λ. Finally, with air-pressure-based actuation testing under 0.07 MPa, the VCM deforms approximately 36.89 µm and maintains the RMS surface performance of 1/10λ, 1/40λ with and without spherical aberrations, respectively.

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Carbon fibre composite deformable mirrors: developments at UCL

Cited by 2 publications

References 0 publications

A 1-metre Ni coated CFRP demonstrator for large deformable mirrors

A 1-metre Ni coated CFRP demonstrator for large deformable mirrors

Solving, analyzing, manufacturing, and experimental testing of thickness distribution for a cycloid-like variable curvature mirror

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