Identification and calibration of the interaction matrix parameters for AO and MCAO systems

Abstract

New tomographic Adaptive Optics (AO) concepts require a good knowledge of the system geometry and characteristics. These parameters are used to feed the tomographic reconstructors. In this paper we present a method to precisely identify the parameters required to construct an accurate synthetic set of models such as influence functions, mis-registrations, directions of analysis or altitude of the DMs. The method is based on a multi-parameter fit of the interaction matrix. This identification method finds also its application in high contrast AO systems, such as SPHERE : in that case it is used as a diagnostic tool in order to precisely realign the system. The method has been tested and successfully implemented on HOMER, SPHERE and GeMS. Experimental results for these three systems are presented. Show more