Abstract
Abstract The control system is the vital link between the wave front sensor and the wavefront corrector in all adaptive optics systems. Its function is to convert the wavefront measurements made by the sensor into a set of commands that are applied to the wavefront corrector to satisfy a suitable performance criterion, such as minimizing the residual wavefront error. The main functions in a typical adaptive optics control loop are shown in figure 8.1. The wavefront sensor generates an array of wavefront slope or curvature measurements that are first reconstructed spatially into a continuous two-dimensional representation of the wavefront error. The wavefront predictor minimizes temporal noise by smoothing the data in time and makes the best estimate of the wavefront error for the next correction cycle. The commands to be applied to the wavefront corrector are then computed, taking into account the spatial and temporal characteristics of the wavefront disturbances and the correction system.
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