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Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. Statistical moments of the Strehl ratio
 Ellerbroek, Brent L. ; American Astronomical Society AAS; Society of PhotoOptical Instrumentation Engineers SPIE, Bellingham/Wash.: Adaptive optics systems III. Pt.4 : 1  6 July 2012, Amsterdam, Netherlands; part of SPIE astronomical instrumentation Bellingham, WA: SPIE, 2012 (Proceedings of SPIE 8447) ISBN: 9780819491480 Paper 84475Y 
 Conference "Adaptive Optics Systems" <3, 2012, Amsterdam> 

 English 
 Conference Paper 
 Fraunhofer IOSB () 
 Strehl ratio; adaptive optics; speckle 
Abstract
Knowledge of the statistical characteristics of the Strehl ratio is essential for the performance assessment of the existing and future adaptive optics systems. For full assessment not only the mean value of the Strehl ratio but also higher statistical moments are important. Variance is related to the stability of an image and skewness reflects the chance to have in a set of short exposure images more or less images with the quality exceeding the mean. Skewness is a central parameter in the domain of lucky imaging. We present a rigorous theory for the calculation of the mean value, the variance and the skewness of the Strehl ratio. In our approach we represent the residual wavefront as being formed by independent cells. The level of the adaptive optics correction defines the number of the cells and the variance of the cells, which are the two main parameters of our theory. The deliverables are the values of the three moments as the functions of the correction level. We make no further assumptions except for the statistical independence of the cells.