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Comparison of wavefront sensing with the Shack-Hartmann and pyramid sensors

机译:与Shack-Hartmann和金字塔传感器进行波前感测的比较

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The Shack-Hartmann wavefront sensor operates by subdividing the complex field in the aperture plane of the telescope with a lenslet array and forming low resolution images of the object. An alternative wavefront sensing scheme can be derived from placing a lenslet array at the focal plane of the aperture and forming low resolution images of the aperture. This arrangement can be viewed as the generalisation of the pyramid sensor and enables direct comparisons of the pyramid sensor with the Shack-Hartmann sensor. In particular, in this paper the performance of the reconstructor of the two sensors is investigated. Simulation results demonstrate that the lenslet array at the focal plane has equivalent performance to the Shack-Hartmann sensor in open loop when no modulation is applied to the lenslet array. However, when the array is modulated in a manner akin to the pyramid sensor, subdivision at the focal plane provides a significantly better wavefront estimate than the Shack-Hartmann sensor.
机译:Shack-Hartmann波前传感器的工作原理是用微透镜阵列将望远镜的孔径平面内的复数场细分,并形成物体的低分辨率图像。可以通过将小透镜阵列放置在光圈的焦平面上并形成光圈的低分辨率图像来获得替代的波前感测方案。这种安排可以看作是金字塔传感器的一般化,可以直接比较金字塔传感器与Shack-Hartmann传感器。特别地,在本文中,研究了两个传感器的重建器的性能。仿真结果表明,在未对微透镜阵列进行调制的情况下,焦平面上的微透镜阵列在开环条件下的性能与Shack-Hartmann传感器相当。但是,当阵列以类似于金字塔传感器的方式进行调制时,与Shack-Hartmann传感器相比,焦平面处的细分可提供更好的波前估计。

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