Hartmann-Shack analysis errors.
A theoretical model for reconstruction errors in the Hartmann-Shack wave-front sensor was constructed. The measured pattern of a regulargrid of spots can be analyzed by their individual centroiding or by a globalFourier demodulation. We investigate pixelization errors in the cameraand Poisson errors in the camera pixels. We show that by the Fourier demodulation technique it is possible to overcome pixelization errors which occur in the traditional centroid technique. By supporting simulations we show that the two methods coincide for an infinite number of pixels per spot.
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