The Fresnel Imager: learning from ground-based generation I prototype

Details The Fresnel Imager: learning from ground-based generation I prototype The Fresnel Imager: learning from ground-based generation I prototype

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011exa....30..137s&link_type=abstract

Experimental Astronomy, Volume 30, Issue 2-3, pp. 137-147

Astronomy and Astrophysics

Astronomy

Fresnel, High Dynamic Range, High Angular Resolution, Ground-Based Prototype

Scientific paper

The "Generation I Fresnel Imager Prototype" is a ground-based prototype of a Fresnel Imager (Koechlin et al., Astron Astrophys 443:709-720, 2005), reduced in size (optical elements have a dimension of a few cm) but which features all the elements of an operational Fresnel Imager, and integrated in a clean room. Its design has started in October 2004, the first images were obtained early 2006, the key optical element: a cophased Fresnel Zone Lens, was integrated during summer 2006, and since then it has been used to evaluate new types of target shapes, of Fresnel Array cuttings... . It has been decommissioned end of 2008, some constitutive elements becoming parts of the so-called "Generation II Fresnel Imager Prototype". We present the constitutive elements and the achieved results, and the lessons learned from this prototype.

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