Development of critical technologies for high-precision space optics

我们已经为高精度空间光学（如计划中的SOLAR-B卫星）进行了石墨氰酸盐复合管的开发和表征。基本的机械。评价了单向石墨-氰酸盐层合板的热性能和吸湿性能。为了减小纵向热变形，设计了模型管材纤维的取向。在此基础上，我们制作了一个派克模型，并进行了一系列的测试，以评估其热膨胀性能（0.1 ppm）、吸湿性能（比传统的石墨-环氧复合材料好10倍）、导热系数（111 w/mk）和长期稳定性。结果表明，该复合材料具有优异的性能，是下一代空间光学器件中最有前途的候选材料。然后我们开始设计和制造超轻型镜面，它可以用作太阳空间望远镜的主镜。该反射镜由石墨-氰酸盐复合结构支撑的零度玻璃薄反射镜组成。石墨氰酸盐复合结构与玻璃镜面相接合的表面板具有与表面玻璃相匹配的CTE，其背后的背结构具有较大的导热系数，将热负荷倾倒在玻璃表面。组装结构（玻璃板+复合材料背面结构）后，将玻璃表面抛光为抛物面，表面图形误差高达lambda/44 （lambda=633 nm）。然而，为了提高表面图形的长期稳定性，还需要进一步的研究。

We have performed the development and characterization of the graphite cyanate composite pipes for high-precision space optics such as the planned SOLAR-B satellite. Fundamental mechanical. thermal, and hygroscopic properties of unidirectional graphite-cyanate laminates were evaluated. The orientation of the fibers of a model pipe structure was designed to minimize the longitudinal thermal deformation. A model pike was fabricated based on the design, and we have performed series of measurements to evaluate the thermal expansion behavior (a few 0.1 ppm), the hygroscopic performance (10times better than the conventional graphite-epoxy composite), the thermal conductivity (111 w/mk), and the long-term stability. Excellent performance was verified, and the composite material was turned out to be the most promising candidate for the next-generation space-optics.We then proceeded to the design and fabrication of the ultra light-weight mirror that can be used as the primary mirror of a solar space telescope. The mirror consists of zerodure glass thin mirror supported by the graphite cyanate composite structure. The surface plate of the graphite cyanate composite structure that interfaces the glass mirror has an CTE matched to that of the glass over the surface, and the back-structure behind it has a large thermal conductivity to dump the heat load on the glass surface. The glass surface was polished to paraboloid with surface figure error as high as lambda/44 (lambda=633 nm), after the assembly of the structure (glass plate + composite material back structure). However, further investigation is needed to improve the long term stability of the surface figure.