Abstract
AbstractCAS500-1 (Compact Advanced Satellite 500-1) launched in Mar. 2021 is the first Korean ground observation satellite localizing the entire mirror development, especially the primary mirror M1. M1 is a lightweight concave mirror with a diameter of 0.6 m, and it has 3 square bosses at the rim for flexure mounting. We present the whole development procedure of the flight model M1, including the optomechanical design, fabrication, environmental tests, and a coordinate mapping method for alignment and integration.
Highlights
The front-end optical components of most satellite telescopes are made of mirrors, because multispectral channels can be configured and the beam path can be folded for a compact optical system
We have built the whole in-house workflow spanning from the optomechanical design to the lightweighting and acid-etching of mirror substrates, aspheric polishing and testing, durable reflective coating, adhesive bonding with flexure mounts, and thermal vacuum tests [17, 18]
M1 is used as a reference frame when aligning subsequent optical components, and we propose to use a computer-generated hologram (CGH) as a coordinate reference to map the optical axis of M1
Summary
The front-end optical components of most satellite telescopes are made of mirrors, because multispectral channels can be configured and the beam path can be folded for a compact optical system. As the primary mirror (M1) gets larger for better light collecting capability, its substrate design and mounting methods become more important for optical testing and alignment on the ground [1,2,3,4]. IROA was the first optical system proven for space heritage as being developed from the ground up, i.e., starting with the optomechanical design [10, 11]. We have built the whole in-house workflow spanning from the optomechanical design to the lightweighting and acid-etching of mirror substrates, aspheric polishing and testing, durable reflective coating, adhesive bonding with flexure mounts, and thermal vacuum tests [17, 18]. Mirror surface distortion due to gravity should be low enough for diffraction-limited optical performance when tested on the ground.
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