We have preliminarily designed two infrared optical systems of the multi-purpose infrared camera system (MIRIS) which is the main payload of STSAT-3. Each optical system consists of a Cassegrain telescope, a field lens and a 1:1 re-imaging lens system that is essential for providing a cold stop. The Cassegrain telescope is identical for both of two infrared cameras, but the field correction lens and re-imaging lens system are different from each other because of different bands of wavelength. The effective aperture size is 100mm in diameter and the focal ratio is f/5. The total length of the optical system is 300mm and the position of the cold stop is 25mm from the detector focal plane. The RMS spot size is smaller than 40μm over the whole detector plane.

• 육인수(한국천문연구원) | I.-S. YUK (Korea Astronomy and Space Science Institute)
• 진호(한국천문연구원) | H. JIN (Korea Astronomy and Space Science Institute)
• 이성호(한국천문연구원) | S. LEE (Korea Astronomy and Space Science Institute)
• 박영식(한국천문연구원) | Y.-S. PARK (Korea Astronomy and Space Science Institute)
• 이대희(한국천문연구원) | D.-H. LEE (Korea Astronomy and Space Science Institute)
• 남욱원(한국천문연구원) | U.-W. NAM (Korea Astronomy and Space Science Institute)
• 박장현(한국천문연구원) | J.-H. PARK (Korea Astronomy and Space Science Institute)
• 한원용(한국천문연구원) | W.-Y. HAN (Korea Astronomy and Space Science Institute)
• 이종웅(청주대학교) | J.-W. LEE (Cheongju University)