Radio Imaging and CLEAN - NRAO
Radio Imaging and CLEAN - NRAO
Radio Imaging and CLEAN - NRAO
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From Sky Brightness to Visibility<br />
1. An interferometer measures the interference pattern produced by<br />
two apertures.<br />
2. The interference pattern is directly related to the source brightness.<br />
For small fields of view the complex visibility, V(u,v), is the 2D<br />
Fourier transform of the brightness on the sky, T(l,m)<br />
van Cittert-Zernike theorem<br />
Fourier space/domain<br />
Image space/domain<br />
Sunday, January 22, 2012<br />
image plane<br />
l<br />
uv plane<br />
T(l,m)<br />
4<br />
m
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