Evaluation index of the actual resolution after correction of adaptive optical system

A new index,Resolved Cells Ratio( RCR),was proposed to evaluate the actual resolution of ground-based large-aperture telescope for spatial objective observation after adaptive optical system partial correcting. We discussed the physical meaning of the RCR combined with the observation instances of the 1. 23 adaptive optical telescope. The range of the application of the RCR,the error influence factors and the effect of the atmospheric dispersion on the RCR were also analyzed. The result shows that the RCR could completely reflect the correction effectiveness of the adaptive optical telescope and the physical meaning of the RCR wasintuitive. RCR can be applied to the estimation of the correction effectiveness of a telescope that can get the characterization of the wavefront. The error of the RCR mainly depend on the measurement error of the wavefront sensor. The effect of atmospheric dispersion on the RCR can be neglected.