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DEVELOPMENT OF MIDIUM-SIZE COOLED LIGHT-WIGHT SILICON CARBIDE MIRRORS FOR INFRARED ASTRONOMICAL SATELLITES

红外天文卫星中型冷却轻型碳化硅反射镜的研制

基本信息

批准号：
10559005
负责人：
ONAKA Takashi
金额：
$ 8.58万
依托单位：
THE UNIVERSITY OF TOKYO
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10559005/
关键词：
COOLED TELESCOPE INFRARED LIGHT-WEIGHT MIRROR SPACE-BORNE INSTRUMENTS SILICON CARBIDE SPACE OBSERVATION

项目摘要

We have established the process to make a mirror blank of silicon carbide(SiC)porous core and SiC CVD coat based on the measurement of 160mm test mirrors at cryogenic temperatures. We have found that the CVD coat has to be applied on the entire surface of the mirror to prevent the polishing liquid from permeating into the blank. We have confirmed that the mirror made in this way does not show any appreciable deformation even when it is cooled down to liquid helium temperature. We have also examined the effects of the glue and found that it would not make significant problems if the metal part is well treated thermally in advance. We have fabricated a 700mm SiC mirror based on these processes and tested it at liquid helium temperature together with the supporting parts attached. We have found that the non-elastic deformation occurred due to the difference in the coefficients of thermal expansion between the supporting parts(metal)and the mirror at cryogenic temperatures. This will still not make a significant problem for use in infrared wavelengths and we have concluded that the main purpose of the present research has been achieved. However, details of the deformation process, particularly its repeatability, and its effects at room temperature in the adjustment process have to be investigated in detail in next step.

基于在低温下对 160mm 测试镜的测量，我们建立了碳化硅 (SiC) 多孔芯镜毛坯和 SiC CVD 涂层的制造工艺。我们发现CVD涂层必须涂在镜子的整个表面上，以防止抛光液渗透到毛坯中。我们已经证实，用这种方法制成的镜子即使冷却到液氦温度也不会出现任何明显的变形。我们还检查了胶水的效果，发现如果金属部件事先经过良好的热处理，不会产生太大的问题。我们基于这些工艺制造了700mm SiC反射镜，并在液氦温度下对其连同支撑部件进行了测试。我们发现，在低温下，由于支撑部件（金属）和镜子之间的热膨胀系数不同而发生非弹性变形。这对于红外波长的使用仍然不会造成重大问题，我们得出的结论是，本研究的主要目的已经实现。然而，变形过程的细节，特别是其可重复性，及其在调节过程中在室温下的影响，必须在下一步进行详细研究。