Yoon Geunyoung, Pantanelli Seth, Nagy Lana J
University of Rochester, Department of Ophthalmology, Biomedical Engineering and Center for Visual Science, New York 14627, USA.
J Biomed Opt. 2006 May-Jun;11(3):30502. doi: 10.1117/1.2197860.
A conventional Shack-Hartmann wavefront sensor has a limitation that increasing the dynamic range usually requires sacrificing measurement sensitivity. The prototype large-dynamic-range Shack-Hartmann wavefront sensor presented resolves this problem by using a translatable plate with subapertures placed in conjugate with the lenslet array. Each subaperture is the same size as a lenslet and they are arranged so that they overlap every other lenslet position. Three translations of the plate are required to acquire four images to complete one measurement. This method increases the dynamic range by a factor of two with no subsequent change in measurement sensitivity and sampling resolution of the aberration. The feasibility of the sensor was demonstrated by measuring the higher order aberrations of a custom-made phase plate and human eyes with and without the plate.
传统的夏克-哈特曼波前传感器存在一个局限性，即增加动态范围通常需要牺牲测量灵敏度。所提出的新型大动态范围夏克-哈特曼波前传感器通过使用一个带有子孔径的可平移平板来解决这一问题，该平板与微透镜阵列共轭放置。每个子孔径的大小与一个微透镜相同，并且它们的排列方式使得它们与每隔一个微透镜位置重叠。需要平板进行三次平移来获取四张图像以完成一次测量。这种方法将动态范围提高了两倍，而不会随后改变像差的测量灵敏度和采样分辨率。通过测量定制相位板以及佩戴和不佩戴该相位板的人眼的高阶像差，证明了该传感器的可行性。
