Amplitude fluctuations in curvature sensing: comparison of two schemes

V. V. Voitsekhovich, V. G. Orlov


The influence of amplitude fluctuations on the quality of phase reconstruction in curvature sensing is investigated. Two curvature schemes are compared: one with two symmetrically-defocused images (Roddier scheme) and one with a single defocused image (Hickson scheme). It is shown that the accuracy of phase reconstruction with the Hickson scheme is strongly aected even by low-level amplitude fluctuations, while the Roddier scheme works well under quite strong amplitude fluctuations.


instrumentation: adaptive optics; techniques: high angular resolution

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