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Impact of Large Field Angles on the Requirements for Deformable Mirror in Imaging Satellites

机译：大视场角对成像卫星可变形反射镜要求的影响

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For certain imaging satellite missions, a large aperture with wide field-of-view is needed. In order to achieve diffraction limited performance, the mirror surface Root-Mean Square (RMS) error has to be less than 0.05 waves. In the case of visible light, it has to be less than 30 nm. This requirement is difficult to meet as the large aperture will need to be segmented in order to fit inside a launch vehicle shroud. To reduce this requirement and to compensate for the residual wavefront error, Micro-Electro-Mechanical System (MEMS) deformable mirrors can be considered in the aft optics of the optical system. MEMS deformable mirrors are affordable and consume low power, but are small in size. Due to the major reduction in pupil size for the deformable mirror, the effective field angle is magnified by the diameter ratio of the primary and deformable mirror. For wide field of view imaging, the required deformable mirror correction is field angle dependant, impacting the required parameters of a deformable mirror such as size, number of actuators, and actuator stroke. In this paper, a representative telescope and deformable mirror system model is developed and the deformable mirror correction is simulated to study the impact of the large field angles in correcting a wavefront error using a deformable mirror in the aft optics.
机译：对于某些成像卫星任务，需要具有宽视野的大光圈。为了获得衍射受限的性能，镜面均方根（RMS）误差必须小于0.05波。在可见光的情况下，它必须小于30 nm。很难满足此要求，因为需要将大孔径分割才能安装在运载火箭的护罩内。为了减少此要求并补偿残留的波前误差，可以在光学系统的后部光学器件中考虑微机电系统（MEMS）可变形镜。 MEMS变形镜价格合理，功耗低，但尺寸小。由于可变形镜的瞳孔尺寸大大减小，有效视场角被主镜和可变形镜的直径比放大了。对于宽视场成像，所需的可变形反射镜校正取决于视场角，从而影响可变形反射镜的所需参数，例如尺寸，致动器数量和致动器行程。本文建立了具有代表性的望远镜和可变形反射镜系统模型，并通过模拟可变形反射镜校正来研究大视场角在后视光学系统中使用可变形反射镜校正波前误差的影响。

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