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overview of the basic theory of optical propagatio
junshan02 发表于 2012/7/14 10:53:00 |
In reality the pattern of blobs (speckles) in the images changes very rapidly, so that long exposure photographs would just show a single large blurred blob in the centre for each telescope diameter. The diameter (FWHM) of the large blurred blob in long exposure images is called the seeing disc diameter, and is independent of the telescope diameter used (as long as adaptive optics correction is not applied).
It is first useful to give a brief overview of the basic theory of optical propagation through the atmosphere. In the standard classical theory, light is treated as an oscillation in a field . For monochromatic plane waves arriving from a distant point source with wave-vector : where is the complex field at position and time , with real and imaginary parts corresponding to the electric and magnetic field components, represents a phase offset, is the frequency of the light determined by Moncler
Down Jackets Men, and is the amplitude of the light. |
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