Astrophysics (index)

Aperture

(opening through which light passes)

An Aperture is an opening through which light passes, the term being used to describe the light-collecting opening of a telescope, and also used analogously for Radio Telescopes and telescopes for other parts of the Electromagnetic Radiation (EMR) spectrum. The size is generally listed as a length, e.g., meters, which presumes they are circular, which is generally but not always the case. The size of the aperture affects the instruments Angular Resolution due to Diffraction.

The current technique of Apodization consists of deliberately reducing and/or reshaping the aperture in order to change the resulting diffraction patterns and tease out detail that diffraction would normally hide.


(EMR,visible light)
http://en.wikipedia.org/wiki/Aperture

Referenced by:
Airy Disk
Angular Resolution
Aperture Photometry
Aperture Synthesis
Apodization
Arecibo Observatory (NAIC)
BLAST
Cassini
Extremely Large Telescope (ELT)
European Southern Observatory Very Large Telescope (ESO VLT)
FAST
Fast Fourier Transform Telescope
Gran Telescopio Canarias (GTC)
HATNet
Interferometer
KELT
NGTS
Phased Array
Point-Spread Function (PSF)
Schmidt-Newton Telescope
Seeing
Square Kilometre Array (SKA)
Software Telescope
Speckle Suppression
Strehl Ratio

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