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Topic: List of astronomical interferometers at visible and infrared wavelengths

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	Online Encyclopedia and Dictionary - Very Large Telescope
		The principle role of the VLT is to operate as four independent telescopes, and the interferometry (combining light from multiple telescopes) is a minor secondary role.
		The VLT is intended to achieve an effective angular resolution of 0.001 arcsecond at a wavelength of 1 µm, comparable to that achieved using other arrays such as the Navy Prototype Optical Interferometer and the CHARA Array.
		All the stars visible to the naked eye have temperatures of several thousand degrees, and have large enough surface brightnesses and angular sizes to be observed by the VLTI.
	www.fact-archive.com /encyclopedia/VLT (634 words)

	Observational astronomy - Wikipedia, the free encyclopedia
		Visible light astronomy (using wavelengths that can be detected with the eyes, about 400 - 700 nm) falls in the middle of this range.
		Infrared astronomy deals with the detection and analysis of infrared radiation (this typically refers to wavelengths longer than the detection limit of silicon solid-state detectors, about 1 μm wavelength).
		Infrared light is heavily absorbed by water vapor, so infrared observatories have to be located in high, dry places or in space.
	en.wikipedia.org /wiki/Observational_astronomy (2745 words)

	Interferometry information - Search.com
		This technique is the basis for astronomical interferometer arrays which, spread out over a wide area, can together produce a picture with resolution similar or equivalent to a single telescope with the diameter of the combined spread of telescopes.
		However, interferometers are perhaps even more widely used in integrated optical circuits, in the form of a Mach-Zehnder interferometer, in which light interferes between two branches of a waveguide that are (typically) externally modulated to vary their relative phase.
		It is often said that an interferometer achieves the effect of a telescope the size of the distance between the apertures; this is only true in the limited sense of angular resolution.
	domainhelp.search.com /reference/Interferometry?redir=1 (2121 words)

	Infrared astronomy - Biocrawler (Site not responding. Last check: 2007-10-09)
		Infrared astronomy is the branch of astronomy and astrophysics which deals with objects visible in infrared (IR) radiation.
		For this reason, the near infrared region of the spectrum is commonly incorporated as part of the "optical" spectrum, along with the near ultraviolet (most scientific instruments such as optical telescopes cover the near infrared as well as the visible).
		As infrared is esentially heat radiation, infrared telescopes (which include most major optical telescopes as well as a few dedicated infrared telescopes) need to have their detectors shielded from heat and chilled with liquid nitrogen in order to actually form images.
	www.biocrawler.com /encyclopedia/Infrared_astronomy (706 words)

	VLTI - find information about VLTI at BigServing.com
		The VLTs are equipped with a large set of instruments permitting observations to be performed from the near-UV to the mid-IR (ie a large fraction of the light wavelengths accessible from the surface of the Earth), with the full range of techniques including high-resolution spectroscopy, multi-object spectroscopy, imaging, and high-resolution imaging.
		In particular, the VLT has several Adaptive optics systems, which at infrared wavelengths correct for the effects of the atmospheric turbulence, providing images almost as sharp as if the telescope was in space.
		The VLTI is intended to achieve an effective angular resolution of 0.001 arcsecond at a wavelength of 1 µm.
	www.bigserving.com /VLTI.htm (2227 words)

	Interferometry - Wikipedia, the free encyclopedia
		The VLT Interferometer is expected to produce its first images soon, followed by other interferometers such as the CHARA array and the Magdalena Ridge Observatory Interferometer which may consist of up to 10 optical telescopes.
		The interferometer setup shown to the right was used in the famous Michelson-Morley experiment that provided evidence for special relativity.
		However, interferometers are perhaps even more widely used in integrated optical circuits, in the form of a Mach-Zehnder interferometer, in which light interferes between two branches of a waveguide that are (typically) externally modulated to vary their relative phase.
	www.wikipedia.org /wiki/Interferometry (826 words)

	Very Large Telescope - Wikipedia, the free encyclopedia
		The VLTs are equipped with a large set of instruments permitting observations to be performed from the near-UV to the mid-IR (ie a large fraction of the light wavelengths accessible from the surface of the Earth), with the full range of techniques including high-resolution spectroscopy, multi-object spectroscopy, imaging, and high-resolution imaging.
		In particular, the VLT has several Adaptive optics systems, which at infrared wavelengths correct for the effects of the atmospheric turbulence, providing images almost as sharp as if the telescope was in space.
		The VLTI is intended to achieve an effective angular resolution of 0.001 arcsecond at a wavelength of 1 µm.
	www.wikipedia.org /wiki/Yepun_telescope (1110 words)

	Encyclopedia: Telescope (Site not responding. Last check: 2007-10-09)
		See also: List of optical topics Optics (appearance or look in ancient Greek) is a branch of physics that describes the behavior and properties of light and the interaction of light with matter.
		The wavelength is the distance between repeating units of a wave pattern.
		The telescope was aimed by the aid of a Foucault sidérostat, which is a movable plane mirror of diameter 6.56 feet, mounted in a large cast-iron frame.
	www.nationmaster.com /encyclopedia/Telescope (1275 words)

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