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- Fresnel_Imager 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. 1/20th 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.".
- Fresnel_Imager wikiPageExternalLink FresnelArraysPosterA4V3.pdf.
- Fresnel_Imager wikiPageExternalLink PropalFresnel-CosmicVision_20070706.pdf.
- Fresnel_Imager wikiPageExternalLink aa2880-05.pdf.
- Fresnel_Imager wikiPageExternalLink papierFresnelV1.pdf.
- Fresnel_Imager wikiPageID "24279120".
- Fresnel_Imager wikiPageRevisionID "600405453".
- Fresnel_Imager hasPhotoCollection Fresnel_Imager.
- Fresnel_Imager subject Category:European_Space_Agency.
- Fresnel_Imager subject Category:Interferometric_telescopes.
- Fresnel_Imager subject Category:Space_observatories.
- Fresnel_Imager subject Category:Ultraviolet_telescopes.
- Fresnel_Imager type Artifact100021939.
- Fresnel_Imager type Device103183080.
- Fresnel_Imager type Instrument103574816.
- Fresnel_Imager type Instrumentality103575240.
- Fresnel_Imager type InterferometricTelescopes.
- Fresnel_Imager type Magnifier103709206.
- Fresnel_Imager type Object100002684.
- Fresnel_Imager type PhysicalEntity100001930.
- Fresnel_Imager type ScientificInstrument104147495.
- Fresnel_Imager type SpaceTelescopes.
- Fresnel_Imager type Telescope104403638.
- Fresnel_Imager type UltravioletTelescopes.
- Fresnel_Imager type Whole100003553.
- Fresnel_Imager 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.".
- Fresnel_Imager label "Fresnel Imager".
- Fresnel_Imager sameAs m.07s83l8.
- Fresnel_Imager sameAs Q5503150.
- Fresnel_Imager sameAs Q5503150.
- Fresnel_Imager sameAs Fresnel_Imager.
- Fresnel_Imager wasDerivedFrom Fresnel_Imager?oldid=600405453.
- Fresnel_Imager isPrimaryTopicOf Fresnel_Imager.