A study of Wavefront Aberration Measurement Technology based on Centroid Calculation

2021 IEEE International Conference on Consumer Electronics-Taiwan (ICCE-TW) Pub Date : 2021-09-15 DOI:10.1109/ICCE-TW52618.2021.9603000

C. Lin, Hsuan-Fu Wang, Zinan Huang

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Abstract

The basic structure of the Shack-Hartmann wavefront sensor (SHWFS) is a microlens array and a set of sensors. Some conditions before the light enters the sensor from the imaging system cause the pixels to sense uneven light and generate a lot of noise in the image. Therefore, a set of noise filtering methods is needed to reduce the influence of noise in the image. Theoretically, the strongest point of the laser spot can be regarded as the center of mass of the laser spot. In this study, the best focus is used to capture the image. Perform image processing and use the program to evaluate various weights and thresholds to obtain centroid coordinates. The centroid control group will be used as an unaffected standard reference in the future. After that, the system adds an experimental group that changes the light wave front to perform quality control. The calculation of the wavefront value obtained by evaluating the position of the light spot, Zernike coefficient and Zemax can be used to verify the accuracy of the calculated wavefront aberration.

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基于质心计算的波前像差测量技术研究

Shack-Hartmann波前传感器(SHWFS)的基本结构是微透镜阵列和一组传感器。在光线从成像系统进入传感器之前，某些条件会导致像素感知不均匀的光线，从而在图像中产生大量噪声。因此，需要一套噪声滤波方法来降低图像中噪声的影响。理论上，激光光斑的最强点可以看作是激光光斑的质心。在本研究中，使用最佳焦点来捕捉图像。执行图像处理，并使用该程序评估各种权重和阈值，以获得质心坐标。质心对照组将作为未来未受影响的标准参考。在此之后，系统增加了一个实验组，改变光波前进行质量控制。通过计算光斑位置、泽尼克系数和Zemax得到的波前值，可以验证计算的波前像差的准确性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2021 IEEE International Conference on Consumer Electronics-Taiwan (ICCE-TW)

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