13 June 2005 Wavefront reconstruction algorithms for the adaptive Shack-Hartmann sensor
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Abstract
The adaptive Shack-Hartmann sensor (ASHS) is a modifictaion of the conventional Shack Hartman sensor which uses a dynamic Liquid Crystal Display (LCD) in replacement of the static diffractive or refractive microlens array. The LCD is used to display an array of Fresnel microlenses. The microlenses can be adapted to the wavefront in order to enhance measurement accuracy and dynamic range. Because of the relatively large pixel of the LCD the size of the microlenses is larger than in a conventional sensor. The number of microlenses is limited by the resolution of the LCD and therefore smaller than in a conventional sensor. Certain considerations are required when restoring the wavefront phase values with the reconstruction algorithm. We present two matrix inversion reconstruction methods: The classic Zernike approach and a BSpline algorithm. We will compare these two methods on the basis of fit accuracy, reconstruction time and the effect of noise and missing data points.
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Lars Seifert, Hans J. Tiziani, Wolfgang Osten, "Wavefront reconstruction algorithms for the adaptive Shack-Hartmann sensor", Proc. SPIE 5856, Optical Measurement Systems for Industrial Inspection IV, (13 June 2005); doi: 10.1117/12.612544; https://doi.org/10.1117/12.612544
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