Precise calibration of pupil images in pyramid wavefront sensor

Liu Yong; Mu Quanquan; Cao Zhaoliang; Hu Lifa; Yang Chengliang; Xuan Li

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Precise calibration of pupil images in pyramid wavefront sensor

机译：金字塔波峰传感器中瞳孔图像精确校准

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The pyramid wavefront sensor (PWFS) is a novel wavefront sensor with several inspiring advantages compared with Shack-Hartmann wavefront sensors. The PWFS uses four pupil images to calculate the local tilt of the incoming wavefront. Pupil images are conjugated with a telescope pupil so that each pixel in the pupil image is diffraction-limited by the telescope pupil diameter, thus the sensing error of the PWFS is much lower than that of the Shack-Hartmann sensor and is related to the extraction and alignment accuracy of pupil images. However, precise extraction of these images is difficult to conduct in practice. Aiming at improving the sensing accuracy, we analyzed the physical model of calibration of a PWFS and put forward an extraction algorithm. The process was verified via a closed-loop correction experiment. The results showed that the sensing accuracy of the PWFS increased after applying the calibration and extraction method. (c) 2017 Optical Society of America

机译：金字塔波前传感器（PWFS）是一种新颖的波前传感器，与棚屋波前传感器相比，具有多种鼓舞人心的优势。 PWFS使用四个瞳孔图像来计算传入波前的本地倾斜。瞳孔图像与望远镜瞳孔缀合，使得瞳孔图像中的每个像素由望远镜瞳孔直径衍射限制，因此PWF的传感误差远低于Shack-Hartmann传感器的感测误差，并且与提取有关。瞳孔图像的对准精度。然而，在实践中难以进行这些图像的精确提取。旨在提高感测的准确性，我们分析了PWF的校准物理模型，提出了提取算法。通过闭环校正实验验证该过程。结果表明，施加校准和提取方法后，PWF的感测精度增加。（c）2017年光学学会

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来源
《Applied optics》 |2017年第12期|共6页
作者
Liu Yong; Mu Quanquan; Cao Zhaoliang; Hu Lifa; Yang Chengliang; Xuan Li;
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Chinese Acad Sci Changchun Inst Opt Fine Mech &

Phys State Key Lab Appl Opt Changchun 130033 Peoples R China;

Chinese Acad Sci Changchun Inst Opt Fine Mech &

Phys State Key Lab Appl Opt Changchun 130033 Peoples R China;

Chinese Acad Sci Changchun Inst Opt Fine Mech &

Phys State Key Lab Appl Opt Changchun 130033 Peoples R China;

Chinese Acad Sci Changchun Inst Opt Fine Mech &

Phys State Key Lab Appl Opt Changchun 130033 Peoples R China;

Chinese Acad Sci Changchun Inst Opt Fine Mech &

Phys State Key Lab Appl Opt Changchun 130033 Peoples R China;

Chinese Acad Sci Changchun Inst Opt Fine Mech &

Phys State Key Lab Appl Opt Changchun 130033 Peoples R China;

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Precise calibration of pupil images in pyramid wavefront sensor

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