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http://dx.doi.org/10.3807/HKH.2008.19.1.001

The Improvement of the Correlation Method for Shack-Hartmann Wavefront Sensors using Multi-Resolution Method  

Yoo, Jae-Eun (Department of Mechanical Engineering, KAIST and Image Information Research Center)
Youn, Sung-Kie (Department of Mechanical Engineering, KAIST and Image Information Research Center)
Publication Information
Korean Journal of Optics and Photonics / v.19, no.1, 2008 , pp. 1-8 More about this Journal
Abstract
Shack-Hartmann sensors are widely employed as a wavefront measuring device in various applications. Adaptive optics is one of the major applications. Since an adaptive optics system should be operated in real-time, high-speed wavefront sensing is essential. In high-speed operation, integration time of an image detector is very short. In this case, noises such as readout noise and photon noise greatly influence the accuracy of wavefront sensing. Therefore a fast and noise-insensitive centroid finding algorithm is required for the real-time wavefront sensing. In this paper, the multi-resolution correlation method is proposed. By employing multi-resolution images, this method greatly reduces the computation time when compared to the fast Fourier transform (FFT) correlation method. The verification is performed through the computational simulation. In this paper, the center of mass method, correlation method and multi-resolution correlation method are employed to compare the measurement accuracy of the centroid finding algorithms. The accuracy of a Shack-Hartmann wavefront sensor using the proposed algorithm is proved to be comparable to that of the conventional correlation method.
Keywords
Adaptive optics; Shack-Hartmann sensor; Correlation method; Numerical simulation;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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