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

机译:波前感与棚屋和金字塔传感器的比较

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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波前传感器通过将望远镜的孔平面中的复杂场与透镜阵列进行细分并形成物体的低分辨率图像来操作。可以从孔径的焦平面处放置透镜阵列来导出替代波前感测方案并形成孔的低分辨率图像。这种布置可以被视为金字塔传感器的泛化,并能够将金字塔传感器直接比较与棚屋传感器。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,当没有将调制施加到透镜阵列时,焦平面上的透镜阵列对开环中的Shack-Hartmann传感器具有等效性能。然而,当以类似于金字塔传感器的方式调制阵列时,焦平面的细分提供比Shack-Hartmann传感器更好地更好的波前估计。

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