Simulation of an Accelerometer-based Feedforward Vibration Suppression in an Adaptive Optics System for MICADO

摘要

In large telescopes like the E-ELT, the performance of the Adaptive Optics (AO) system is not only dominated by atmospheric disturbances but also by high frequency structural vibrations. Currently these vibrations are suppressed by a model-based feedback controller. When observing faint stars, the performance is reduced by a lower bandwidth because of a larger exposure time of the wavefront senor. The "control bandwidth" can be increased by an additional accelerometer-based feedforward controller, which is independent of the exposure time. This vibration suppression concept was studied in an AO end-to-end simulation and first investigations at a laboratory setup have been performed. Based on these results, we discuss the application for an on-sky testing at the LBT and an implementation in the MICADO AO.