DOI QR코드

DOI QR Code

DEVELOPMENT OF LIGHTWEIGHT OPTICAL TELESCOPE KIT USING ALUMINUM PROFILE AND ISOGRID STRUCTURE

  • Park, Woojin (Korea Astronomy and Space Science Institute) ;
  • Lee, Sunwoo (Division of Scientific Instrumentation and Management, Korea Basic Science Institute) ;
  • Han, Jimin (School of Space Research and Institute of Natural Sciences, Kyung Hee University) ;
  • Ahn, Hojae (School of Space Research and Institute of Natural Sciences, Kyung Hee University) ;
  • Ji, Tae-Geun (School of Space Research and Institute of Natural Sciences, Kyung Hee University) ;
  • Kim, Changgon (School of Space Research and Institute of Natural Sciences, Kyung Hee University) ;
  • Kim, Dohoon (Department of Astronomy & Space Science, Kyung Hee University) ;
  • Lee, Sumin (Department of Astronomy & Space Science, Kyung Hee University) ;
  • Kim, Young-Jae (Graduate School of Analytical Science and Technology (GRAST), Chungnam National University) ;
  • Kim, Geon-Hee (Graduate School of Analytical Science and Technology (GRAST), Chungnam National University) ;
  • Kim, Junghyun (SLLAB, INC.) ;
  • Kim, Ilhoon (SLLAB, INC.) ;
  • Pak, Soojong (School of Space Research and Institute of Natural Sciences, Kyung Hee University)
  • 투고 : 2021.03.16
  • 심사 : 2022.01.04
  • 발행 : 2022.02.28

초록

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 ㎛, 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 ㎛ 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 ㎛ Full Width at Half Maximum (FWHM) at the field center.

키워드

과제정보

This research was supported by the Kyung Hee University Leaders in Industry-University Cooperation granted by the Ministry of Education (LINK+ Project No. 1345323331), and by the National Research Council of Science & Technology (NST) grant by the Korea government (MSIT) (No. CAP-19-01-KASI).

참고문헌

  1. Akima, H. 1970, A New Method of Interpolation and Smooth Curve Fitting Based on Local Procedures, J. ACM, 17, 589-602 https://doi.org/10.1145/321607.321609
  2. Akima, H. 1974, A method of bivariate interpolation and smooth surface fitting based on local procedures, Commun. ACM, 17, 18-20 https://doi.org/10.1145/360767.360779
  3. Atkins, C., Brzozowski, W., Dobson, N., et al. 2019, Lightweighting design optimisation for additively manufactured mirrors, Proc. SPIE, 11116, 353-371
  4. Barnes, W. P. Jr. 1969, Optimal Design of Cored Mirror Structures, Appl. Opt., 8, 1191-1196 https://doi.org/10.1364/AO.8.001191
  5. Battula, T., Georgiev, T., Gille, J., et al. 2018, Contrast computation methods for interferometric measurement of sensor modulation transfer function, J. Electron. Imaging, 27, 013015
  6. Diffrient, R. 1994, Flexure of a Serrurier Truss, Sky & Telescope, 87, 91-94
  7. Elliott, B. 2012, ESA mechanical torque value, THEMIS ESA, THM-ESA-PRC-008, REV. A
  8. Harland, D. 2005, The Story of Space Station Mir, Springer
  9. Hibbeler, R. C. 1983, Engineering Mechanics-Statics (3rd ed.), New York: Macmillan Publishing Co., Inc., 199-224
  10. Ji, T.-G., Park, W., Pak, S., et al. 2021, Error Compensation Software to Remove the Low-Frequency Error of Aluminum Freeform Mirror for an Infrared Off-Axis Telescope, J. Korean Soc. Precis. Eng., 38, 329-336 https://doi.org/10.7736/JKSPE.020.117
  11. Kasunic, K. J., Aikens, D., Szwabowski, D., et al. 2017, Technical and Cost Advantages of Silicon Carbide Telescopes for Small-Satellite Imaging Applications, Proc. SPIE, 10402, 110-126
  12. Kaufman, J. G. 2000, Introduction to Aluminum Alloys and Tempers, Cleveland, OH: ASM International, 39-76
  13. Lubliner, J. 2016, Introduction to Solid Mechanics: An Integrated Approach, Springer
  14. Maeda, A. and Sekiguchi, T. 1998, Telescope commonly used for Cassegrainian and Newtonian systems, Publication number JPH1039233A
  15. Maginnis, O. B. 1903, Roof framing made easy, New York: The Industrial publication company
  16. Park, W., Chang, S., Lim, J. H., et al. 2020, Development of Linear Astigmatism Free - Three Mirror System (LAF-TMS), PASP, 132, 044504 https://doi.org/10.1088/1538-3873/ab7547
  17. Park, W., Pak, S., Kim, G. H., et al. 2020, Transformable Reflective Telescope for Optical Testing and Education, Appl. Opt., 59, 5581-5588 https://doi.org/10.1364/ao.392304
  18. Sarayotis, A. 2009, Astronomical telescope with rotary closing blade, Publication number FR2923303A1
  19. Vukobratovich, D. 2017, Handbook of Optomechanical Engineering: Lightweight mirror design, New York: CRC Press
  20. Watanabe, K. 2008, Reflecting telescope, Publication number JP2008309932A