Comparison of two techniques for determining atmospheric seeing

Physics – Optics

Scientific paper

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Atmospheric Optics, Image Processing, Image Resolution, Modulation Transfer Function, Telescopes, Astronomical Observatories, Charge Coupled Devices

Scientific paper

Two techniques for determining atmospheric 'seeing' conditions are compared in terms of theoretical and experimental results. The techniques are: a method evaluating the modulation transfer function (MTF) of the atmosphere by measuring the line spread function of a star image and a method measuring the angle of arrival through two relatively small apertures. The system measuring angle-of-arrival fluctuations in this study is the Atmospheric Turbulence Measuremet and Observation System (ATMOS). It is shown that the ATMOS system, utilizing a differential angle-of-arrival approach, provides a practical way to obtain accurate field measurements of Fried's parameter. The MTF approach is shown to incorporate several uncertainties such as incorrect focus and vibration effects.

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