模拟日光层成像仪的衍射效应

S. Tappin, J. Davies, C. Eyles
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摘要

本文考虑了日球层成像仪中衍射杂散光的建模问题。重点是由RAL空间提出的成像仪,作为欧空局守夜(以前称为拉格朗日)L5监测任务的A/B1阶段研究的一部分。为了处理极端的衍射角,我们开发了一维版本的PROPER衍射建模库。这用于计算透镜光圈处的图案,然后使用标准的二维版本继续传播到传感器平面。分析了关键仪器参数和建模参数的影响,以期优化建模精度和仪器的衍射性能。
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Simulating diffraction effects in heliospheric imagers
In this paper we consider the modelling of diffracted stray light in heliospheric imagers. The emphasis is on the imagers proposed by RAL Space as part of the phase A/B1 study for ESA’s Vigil (formerly called Lagrange) L5 monitoring mission. In order to handle the extreme diffraction angles, a one-dimensional version of the PROPER diffraction modelling library has been developed. This is used to compute patterns at the lens aperture, and the standard two-dimensional version is then used to continue propagation to the sensor plane. The effects of key instrument and modelling parameters are analysed with a view to optimizing accuracy of the modelling and the diffraction performance of the instrument.
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