813 Development of CFRP Mirrors for Space Telescopes : Study on optical polishing

Abstract

A 】 1CFRP ( Carbon Fiber Reinfc ) rced Plas百cs ) mimrs ft ) r space telescopes were developed， and surface shape accuracy of 1 pm RMS and 曲 ce rouglmess of 5 nrn RMS were achieved for demonstrated mirrors of 150 mm in diameter as 血 bricated using a replica t

Multifunctional Nanostructures with Controllable Band Gap Giving Highly Stable Infrared Emissivity for Smart Thermal Management

“…Figure a shows the thermo-optical characteristics of pristine CFRP (α S = 0.92, ε IR = 0.87), which is commonly used in satellites and advanced applications ,− (Figure b). However, it is vulnerable to degradation when it is externally exposed to the space environment. − Also, its thermo-optical properties cause the buildup of heat.…”

“…Thermal control is essential for spacecraft systems, in order to maintain the temperature of the spacecraft within a narrow range of operating temperatures during the operational lifetime. , The design of thermal control systems (TCSs) on satellites is dictated by the extreme conditions of the harsh environment in space. Large temperature differentials across mission payloads can exert dimensional changes that result in mechanical stresses, which must be mitigated, to avoid structural distortions and ensure mission success. − Without TCSs, these dimensional changes can result in misalignment of scientific instruments: i.e., optical components that are required to observe deep space and discover or monitor planets, as demonstrated recently. − The spacecraft temperature is maintained by means of a delicate balance among external fluxes, emitted radiation, and heat that is produced internally (Figure a). State-of-the-art TCSs include passive methods such as thin foils, multilayer insulation (MLI), sun shields, etc.…”