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천문학회지(JKAS) , Vol.55 no.1 (2022)
pp.11~22

DOI : 10.5303/JKAS.2022.55.1.011

DEVELOPMENT OF LIGHT WEIGHTED OPTICAL TELESCOPE KIT USING ALUMINUM PROFILE AND ISOGRID STRUCTURE

Woojin Park

(1Korea Astronomy and Space Science Institute, Daejeon 34055, Republic of Korea)

Sunwoo Lee

(Division of Scientific Instrumentation and Management, Korea Basic Science Institute, Daejeon 34133, Republic of Korea)

Jimin Han

(School of Space Research and Institute of Natural Sciences, Kyung Hee University, Yongin 17104, Republic of Korea)

Hojae Ahn

(School of Space Research and Institute of Natural Sciences, Kyung Hee University, Yongin 17104, Republic of Korea)

Tae-Geun Ji

(School of Space Research and Institute of Natural Sciences, Kyung Hee University, Yongin 17104, Republic of Korea)

Changgon Kim

(School of Space Research and Institute of Natural Sciences, Kyung Hee University, Yongin 17104, Republic of Korea)

Dohoon Kim

(Department of Astronomy & Space Science, Kyung Hee University, Yongin 17104, Republic of Korea)

Sumin Lee

(Department of Astronomy & Space Science, Kyung Hee University, Yongin 17104, Republic of Korea)

Young-Jae Kim

(Graduate School of Analytical Science and Technology (GRAST), Chungnam National University, Daejeon, 34134,)

Geon-Hee Kim

(Graduate School of Analytical Science and Technology (GRAST), Chungnam National University, Daejeon, 34134, Republic of Korea, Department of Machinery-Materials Convergence System Engineering, Hanbat National University, Daejeon, 34158, Republic of Korea)

Junghyun Kim

(SLLAB, INC., Seoul 08087, Republic of Korea)

Ilhoon Kim

(SLLAB, INC., Seoul 08087, Republic of Korea)

Soojong Pak

(School of Space Research and Institute of Natural Sciences, Kyung Hee University, Yongin 17104, Republic of Korea)

We introduce the Transformable Reflective Telescope (TRT) kit that applies an aluminum profile as a base plate for precise, stable, and lightweight optical system. It has been utilized for optical surface measurements, developing alignment and baffle systems, observing celestial objects, and various educational purposes through Research & Education projects. We upgraded the TRT kit using the aluminum profile and truss and isogrid structures for a high-end optical test device that can be used for prototyping of precision telescopes or satellite optical systems. Thanks to the substantial aluminum profile and lightweight design, mechanical deformation by self-weight is reduced to maximum 67.5 μm, which is an acceptable misalignment error compared to its tolerance limits. From the analysis results of non-linear vibration simulations, we have verified that the kit survives in harsh vibration environments. The primary mirror and secondary mirror modules are precisely aligned within 50 μm positioning error using the high accuracy surface finished aluminum profile and optomechanical parts. The cross laser module helps to align the secondary mirror to fine-tune the optical system. The TRT kit with the precision aluminum mirror guarantees high quality optical performance of 5.53 μm Full Width at Half Maximum (FWHM) at the field center.

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