Abstract
Noise-Insensitive Centroiding Algorithm for a Shack-Hartmann Sensor Kyung-Wan Roh Department of Safety Issue Research, Korea Institute of Nuclear Safety, Daejeon 305-338 Tae-Kyoung Uhm, Ji-Yeon Kim and Sung-Kie Youn Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701 Jun Ho Lee Department of Optical Engineering, Kongju National University, Kongju 314-701 (Received 8 October 2007) A Shack-Hartmann wavefront sensor is the most popular device for wavefront sensing in the eld of adaptive optics. The sensing errors of a Shack-Hartmann sensor are caused by various factors, including the noise of a detector, the magnitude and the pro le of the spot irradiance distribution, etc. This paper investigates the noise e ect in the two major centroiding algorithms, i.e., the center-of-mass method and the correlation method. For this work, wavefront sensing using a Shack-Hartmann sensor is simulated computationally. In this simulation, the input wavefront and the corresponding spot images are generated. Sequentially, the centroids of spots are found, wavefront is reconstructed. From the results of the simulation, an optimal threshold value is proposed for the center-of-mass algorithm. The proposed algorithm is veri ed through a wavefront-sensing experiment. In the experiment, a wavefront with defocus is generated and measured. PACS numbers: 95.75.Qr, 42.15.Fr, 42.30.Va
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