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Comment on 'Compound Solar Sail with Optical Properties: Models and Performance'

机译：评论“具有光学特性的复合太阳帆：模型和性能”

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Compound solar sails recently became a subject of many studies because of the advantages they present when compared to flat sails. As the studies are based on a crude force model of the compound sail dynamics, a new contribution in this field would be important. A recent force model for a dual reflector solar photon thrustor (DRSPT) is supposed to be more realistic. The model takes into account a nonideal light reflection on the sail surface. Unfortunately, there are several reasons to believe that the suggested model does not reflect basic optical properties of the DRSPT. The DRSPT scheme is presented in Fig. 1 (here we redraw its main features while adding some notations). Its modification studied in [1] consists of two spherical cofocal mirrors, collector C (intended to concentrate the sun radiation flow at focus F) and reflector R (presumably transforming the sun radiation flow to a parallel beam), completed by a flat mirror D that redirects the light beam out of the system. However, a number of important optical effects are neglected in [1]. It is easy to show that the light flux in the spherical version of DRSPT does not follow this idealized scheme because of shadowing, spherical aberration, limited size of the mirrors, and multiple reflections on the system elements.
机译：由于与平帆相比具有优势，复合太阳帆最近成为许多研究的主题。由于研究基于复合帆动力学的原动力模型，因此在该领域的新贡献将是重要的。双反射器太阳能光子推进器（DRSPT）的最新力模型应该更为现实。该模型考虑了帆表面上的非理想光反射。不幸的是，有许多理由认为建议的模型不能反映DRSPT的基本光学特性。 DRSPT方案如图1所示（在此我们重画了其主要特征，同时添加了一些注释）。在[1]中研究过的它的修改包括两个球面共焦镜，收集器C（旨在将太阳辐射流集中在焦点F上）和反射器R（大概将太阳辐射流转换为平行光束），由平面镜D完成。将光束重定向到系统之外。但是，在[1]中忽略了许多重要的光学效应。容易证明，由于阴影，球面像差，反射镜尺寸有限以及系统元件上的多次反射，DRSPT球形版本中的光束不遵循这种理想方案。

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