About: Focal cloud

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An Entity of Type : yago:WikicatMirrors, within Data Space : wasabi.inria.fr associated with source document(s)

A focal cloud is the collection of focal points of an imperfect lens or parabolic reflector whether optical, electrostatic or electromagnetic. This includes parabolic antennas and lens-type reflective antennas of all kinds. The effect is analogous to the circle of confusion in photography.

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type	yago:Artifact100021939 yago:Instrumentality103575240 yago:Object100002684 yago:PhysicalEntity100001930 yago:Whole100003553 yago:Device103183080 book yago:Reflector104069276 yago:Mirror103773035 yago:WikicatMirrors
label	Focal cloud
comment	A focal cloud is the collection of focal points of an imperfect lens or parabolic reflector whether optical, electrostatic or electromagnetic. This includes parabolic antennas and lens-type reflective antennas of all kinds. The effect is analogous to the circle of confusion in photography.
sameAs	Focal cloud Focal cloud Focal cloud Focal cloud Focal cloud
topic	dbr:Focal_Cloud dbr:Circle_of_confusion dbr:Feed_horn wikipedia-en:Focal_cloud dbr:Focal_cloud#this
depiction
described by	https://covidontheweb.inria.fr:4443/about/id/entity/http/dbpedia.org/resource/Collection https://covidontheweb.inria.fr:4443/about/id/entity/http/dbpedia.org/resource/Category:Physical_optics proxy:entity/http/dbpedia.org/class/yago/Device103183080
subject	Physical optics Antennas (radio) Mirrors Satellite broadcasting
dbo:wikiPageID	13914100(xsd:integer)
dbo:wikiPageRevisionID	1003343433(xsd:integer)
dbo:wikiPageWikiLink	dbr:Phase_center dbr:Phase_shift Focus (optics) Optical resolution Waveguide Electrostatic lens dbr:Parabolic_antenna dbr:Circle_of_confusion Physical optics Antennas (radio) Mirrors Satellite broadcasting dbr:Lens_(optics) dbr:Feed_horn
is primary topic of	wikipedia-en:Focal_cloud
wasDerivedFrom	wikipedia-en:Focal_cloud?oldid=1003343433&ns=0
http://purl.org/li...ics/gold/hypernym	collection
dbo:abstract	A focal cloud is the collection of focal points of an imperfect lens or parabolic reflector whether optical, electrostatic or electromagnetic. This includes parabolic antennas and lens-type reflective antennas of all kinds. The effect is analogous to the circle of confusion in photography. In a perfect lens or parabolic reflector, rays parallel to the device's axis striking the lens or reflector all pass through a single point, the focal point. In an imperfectly constructed lens or reflector, rays passing through different parts of the element do not converge to a single point but have different focal points. The set of these focal points forms a region called the focal cloud. The diameter of the focal cloud determines the maximum resolution of the optical system. Lens-reflector artifacts, geometry and other imperfections determine the actual diameter of the focal cloud.
dbo:thumbnail	wiki-commons:Special:FilePath/Focal_cloud.jpg?width=300
dbo:wikiPageLength	2936(xsd:integer)
dbp:wikiPageUsesTemplate	dbt:Cn dbt:Unreferenced dbt:Reflist dbt:Antennas
is sameAs of	Focal cloud
is topic of	yago:Device103183080 collection Physical optics
is dbo:wikiPageWikiLink of	dbr:Focal_Cloud dbr:Circle_of_confusion dbr:Feed_horn
is Wikipage redirect of	dbr:Focal_Cloud
is topic of	wikipedia-en:Focal_cloud
is http://vocab.deri.ie/void#inDataset of	https://covidontheweb.inria.fr:4443/about/id/http/dbpedia.org/resource/Focal_cloud

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