25 October 2004 Assembly, integration, and test of the layer-oriented wavefront sensor for MAD
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Proceedings Volume 5490, Advancements in Adaptive Optics; (2004); doi: 10.1117/12.551567
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom
Abstract
MAD5 is a Multi-Conjugate Adaptive Optics (MCAO) system conceived to demonstrate the feasibility of MCAO on the sky. The wave front sensor part is divided in two channels: a Shack-Hartmann sensor and a Layer Oriented sensor. We will describe the construction of the latter one. Assembly, integration and test of the instrument are the first steps for ESO acceptance, before integrating the Layer Oriented sensor with the other components of MAD. We will show qualitative and quantitative results of optical and mechanical tests: in particular we will describe the alignment of the references selection unit, constituted by sixteen motorized linear positioners and eight star enlargers, of the beam compressor and of the two re-imaging objectives, each one conjugated to a different altitude. Being the pyramid the core of this kind of wave front sensor, we will focus our attention on its construction difficulties and we will discuss all the optical tests made to choose the best ones to be installed on the wave front sensor. Finally we will present the sensor performance showing the first open loop results.
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Matteo Lombini, Roberto Ragazzoni, Carmelo Arcidiacono, Andrea Baruffolo, Raffaella Bisson, Angela Brindisi, Julien Coyne, Emiliano Diolaiti, Jacopo Farinato, Brice Le Roux, Gianluca Lombardi, Enrico Marchetti, Gianluigi Meneghini, Elise Vernet-Viard, Marco Xompero, "Assembly, integration, and test of the layer-oriented wavefront sensor for MAD", Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); doi: 10.1117/12.551567; https://doi.org/10.1117/12.551567
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KEYWORDS
Stars

Sensors

Wavefront sensors

Lenses

Telescopes

Charge-coupled devices

Wavefronts

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