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首页> 外文会议>Adaptive Optics and Applications III >Increase of Dynamic Range of a Shack-Hartmann Sensor by Shifting Detector Plane
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Increase of Dynamic Range of a Shack-Hartmann Sensor by Shifting Detector Plane

机译：通过移动探测器平面来增加Shack-Hartmann传感器的动态范围

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The Shack-Hartmann or Hartmann-Shack wavefront sensors are particular forms of the Hartmann sensor and are the most commonly used in adaptive optics. The traditional Hartmann screen in the pupil is replaced by an array of small lenslets at a conjugate to an image of the pupil or deformable mirror. Each lenslet forms an independent image of the incoming wavefront. Shifts in the positions of these images can be shown by simple geometric optics to be proportional to the mean wavefront gradient over each lenslet. The measurement range or dynamic range of a conventional Shack-Hartmann sensor is normally limited by the sub-aperture size of the detector plane, in which each spot should remain. In order to overcome this restriction, several methods, such as modified unwrapped algorithm or a spatial-light modulator as a shutter, have been proposed. We first simulated the image forming of a conventional Shack-Hartmann wavefront sensor for highly aberrated spherical aberrations through computer simulation, which confirmed that the well-known effect that high aberration shifts the spots outside its conventionally detectable area. We first develop a computer program that simulates Shack-Hartmann's image forming and we show that simple defocusing the CCD plane can allocate the out-boundary spots to initial or reference positions, which results in the increase of the dynamic range of the Shack-Hartmann sensor.
机译：Shack-Hartmann或Hartmann-Shack波前传感器是Hartmann传感器的特殊形式，是自适应光学中最常用的传感器。瞳孔中的传统Hartmann屏幕由与瞳孔或可变形镜面共轭的小小透镜阵列代替。每个小透镜形成入射波前的独立图像。这些图像位置的变化可以通过简单的几何光学系统显示出来，与每个小透镜上的平均波阵面梯度成比例。常规Shack-Hartmann传感器的测量范围或动态范围通常受探测器平面的子孔径大小限制，每个光点应保留在其中。为了克服该限制，已经提出了几种方法，例如，改进的展开算法或将空间光调制器用作快门。我们首先通过计算机仿真来模拟用于高像差球差的常规Shack-Hartmann波前传感器的图像形成，这证实了众所周知的高像差效应会把光斑转移到其常规可检测区域之外。首先，我们开发了一个计算机程序来模拟Shack-Hartmann的图像形成过程，结果表明，简单地将CCD平面散焦可以将边界点分配给初始位置或参考位置，这导致Shack-Hartmann传感器的动态范围增加了。

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