Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2004 · 23 citations · 0 references
Natural SciencesAerospace EngineeringGravitySensor FusionX-ray AstronomyBeam SteeringX-ray OpticsX-ray TelescopesCenter Of Gravity EstimationNoise PropagationPositional Measurement ErrorsShack-hartmann Wavefront SensingShack-hartmann Wavefront SensorsSlope MeasurementWavefront Error EstimationWavefront Sensing
Optimization of a Shack-Hartmann based WFS is proposed for XAO systems. Both aliasing effects and noise propagation issues is investigated in order to optimize the WFS device. In particular a new estimator of the spot position is proposed and characterized both analytically and using end-to-end simulations. Analytical expressions of the slope measurement errors is derived and the gain brought by our new Weighted Center of Gravity estimator is quantified.