interference nulling

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• History of astronomical interferometry — See also: astronomical interferometerWilliam Herschel knew as early as 1779 (Herschel 1805) that stars appeared much larger in telescopes than they really were but he did not know why. When Thomas Young demonstrated interference and the wave… …   Wikipedia

• Nuller — A nuller is a tool used to block out a strong source so that fainter signals near the source can be observed. An example of a nuller is being employed on the Keck Interferometer. This causes the light from a star to destructively interfere,… …   Wikipedia

• Astronomical optical interferometry — One of the first astronomical interferometers was built on the Mount Wilson Observatory s reflector telescope in 1920 in order to measure the diameters of stars. The red giant star Betelgeuse was among the first to have its diameter determined in …   Wikipedia

• Michelson interferometer — A Michelson interferometer for use on an optical table. The Michelson interferometer is the most common configuration for optical interferometry and was invented by Albert Abraham Michelson. An interference pattern is produced by splitting a beam …   Wikipedia

• Long-range Wi-Fi — is used for low cost, unregulated point to point connections, as an alternative to cellular networks, microwave or satellite links. The use of the term long range wifi as depicted on this page for extreme ranges is not in any way endorsed by the… …   Wikipedia

• Zero-forcing precoding — Zero forcing (or Null Steering) precoding is a spatial signal processing by which the multiple antenna transmitter can null multiuser interference signals in wireless communications. Regularized zero forcing precoding is enhanced processing to… …   Wikipedia

• Darwin Mission — The Darwin Mission is a proposed European Space Agency (ESA) program designed to directly detect Earth like planets orbiting nearby stars, and search for evidence of life on these planets. The launch date will be at or after 2015 according to the …   Wikipedia

• photoreception — photoreceptive, adj. /foh toh ri sep sheuhn/, n. the physiological perception of light. [1905 10; PHOTO + RECEPTION] * * * Biological responses to stimulation by light, most often referring to the mechanism of vision. In one celled organisms such …   Universalium

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• Astronomical interferometer — An astronomical interferometer is an array of telescopes or mirror segments acting together to probe structures with higher resolution. Astronomical interferometers are widely used for optical astronomy, infrared astronomy, submillimetre… …   Wikipedia

• Darwin (spacecraft) — Darwin General information Organization European Space Agency (ESA) Launched from Guiana Space Centre French Guiana [1] Launch vehicle Soyuz 2/Fregat …   Wikipedia