About: Fresnel imager

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A Fresnel imager is a proposed ultra-lightweight design for a space telescope that uses a Fresnel array as primary optics instead of a typical lens. It focuses light with a thin opaque foil sheet punched with specially shaped holes, thus focusing light on a certain point by using the phenomenon of diffraction. Such patterned sheets, called Fresnel zone plates, have long been used for focusing laser beams, but have so far not been used for astronomy. No optical material is involved in the focusing process as in traditional telescopes. Rather, the light collected by the Fresnel array is concentrated on smaller classical optics (e.g. 1/20 of the array size), to form a final image.

Attributes	Values
rdfs:label	Fresnel imager (en)
rdfs:comment	A Fresnel imager is a proposed ultra-lightweight design for a space telescope that uses a Fresnel array as primary optics instead of a typical lens. It focuses light with a thin opaque foil sheet punched with specially shaped holes, thus focusing light on a certain point by using the phenomenon of diffraction. Such patterned sheets, called Fresnel zone plates, have long been used for focusing laser beams, but have so far not been used for astronomy. No optical material is involved in the focusing process as in traditional telescopes. Rather, the light collected by the Fresnel array is concentrated on smaller classical optics (e.g. 1/20 of the array size), to form a final image. (en)
dcterms:subject	Ultraviolet telescopes Space telescopes Interferometric telescopes European Space Agency
Wikipage page ID	24279120 (xsd:integer)
Wikipage revision ID	1117790704 (xsd:integer)
Link from a Wikipage to another Wikipage	Ultraviolet telescopes Cosmic Vision Space telescopes Fresnel diffraction Fresnel lens Fresnel number Augustin-Jean Fresnel Interferometric telescopes ESA Diffraction Focal length Telescopes European Space Agency Zone plate Solar System Ultraviolet Trojan (astronomy) Fresnel zone plate dbr:Observatoire_Midi-Pyrénées
Link from a Wikipage to an external page	http://www.ast.obs-mip.fr/users/lkoechli/w3/publisenligne/papierFresnelV1.pdf http://www.ast.obs-mip.fr/users/lkoechli/w3/FresnelArraysPosterA4V3.pdf http://www.ast.obs-mip.fr/users/lkoechli/w3/publisenligne/PropalFresnel-CosmicVision_20070706.pdf http://www.ast.obs-mip.fr/users/lkoechli/w3/publisenligne/aa2880-05.pdf
sameAs	Fresnel imager Fresnel imager
dbp:wikiPageUsesTemplate	dbt:Space_observatories dbt:Reflist dbt:Short_description dbt:ESA_projects
has abstract	A Fresnel imager is a proposed ultra-lightweight design for a space telescope that uses a Fresnel array as primary optics instead of a typical lens. It focuses light with a thin opaque foil sheet punched with specially shaped holes, thus focusing light on a certain point by using the phenomenon of diffraction. Such patterned sheets, called Fresnel zone plates, have long been used for focusing laser beams, but have so far not been used for astronomy. No optical material is involved in the focusing process as in traditional telescopes. Rather, the light collected by the Fresnel array is concentrated on smaller classical optics (e.g. 1/20 of the array size), to form a final image. The long focal lengths of the Fresnel imager (a few kilometers) require operation by two-vessel formation flying in space at the L2 Sun-Earth Lagrangian point. In this two-spacecraft formation-flying instrument, one spacecraft holds the focussing element: the Fresnel interferometric array; the other spacecraft holds the field optics, focal instrumentation, and detectors. (en)
prov:wasDerivedFrom	wikipedia-en:Fresnel_imager?oldid=1117790704&ns=0
page length (characters) of wiki page	7531 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Fresnel_imager
is Link from a Wikipage to another Wikipage of	Methods of detecting exoplanets Fresnel Imager Fresnel diffraction Fresnel lens Augustin-Jean Fresnel Diffraction Telescope Fresnel telescope Zone plate
is Wikipage redirect of	Fresnel Imager Fresnel telescope
is foaf:primaryTopic of	wikipedia-en:Fresnel_imager

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