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the fractional change in wavefront
junshan02 发表于 2012/7/14 10:53:00 |
The photon flux in this case is proportional to the square of the amplitude , and the optical phase corresponds to the complex argument of . As wavefronts pass through the Earth's atmosphere they may be perturbed by refractive index variations in the atmosphere. The diagram at the top-right of this page shows schematically a turbulent layer in the Earth's atmosphere perturbing planar wavefronts before they enter a telescope. The perturbed wavefront may be related at any given instant to the original planar wavefront in the following way:
where represents the fractional change in wavefront amplitude and Moncler
Down Jackets Women is the change in wavefront phase introduced by the atmosphere. It is important to emphasise that and describe the effect of the Earth's atmosphere, and the timescales for any changes in these functions will be set by the speed of refractive index fluctuations in the atmosphere. |
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