Dr. Myung K. Cho Profile

Dr. Myung K. Cho

Principal Opto-Mechanical Engineer at NSFs National Optical-Infrared Astronomy Research Lab

SPIE Involvement:

Author | Editor

Publications (75)

Proceedings Article | 4 October 2023 Presentation + Paper

Thermo-elastic analysis of various lateral flexure bonding applications

Youra Jun, Il Kweon Moon, Myung Cho, Jeong-Yeol Han

Proceedings Volume 12677, 126770M (2023) https://doi.org/10.1117/12.2677887

KEYWORDS: Mirrors, Bending stress, Gemini Observatory, Deformable mirrors, Thermal deformation, Titanium, Telescopes, Materials properties, Thermoelasticity, Analytical research

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Proceedings Article | 29 August 2022 Presentation + Paper

Rubin Observatory hexapods: issues and upgrades

Douglas R. Neill, Brian Johnson, Myung Cho, Felipe Daruich, Holger Drass, Mostafa Lutfi, Kevin Sirano, Roberto Tighe, Te-Wei Tsai, Oliver Wiecha

Proceedings Volume 12188, 1218817 (2022) https://doi.org/10.1117/12.2628999

KEYWORDS: Actuators, Telescopes

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Proceedings Article | 29 August 2022 Presentation + Paper

Development of a wide field telescope for the NSOS-α

Myung Cho, Hong-Suh Yim, Jaemann Kyeong, Gary Poczulp, Jung Hyun Jo, Myung-Jin Kim, Ming Liang, Ellie Hileman, Sungki Cho

Proceedings Volume 12188, 1218813 (2022) https://doi.org/10.1117/12.2629307

KEYWORDS: Telescopes, Mirrors, 3D modeling, Solid modeling, Computer aided design, Optical instrument design, Performance modeling, Image quality, Device simulation, Cameras

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Proceedings Article | 29 August 2022 Presentation + Paper

Rubin Observatory Commissioning Camera: summit integration

Brian Stalder, Kevin Reil, Christian Aguilar, Claudio Araya, Anthony Borstad, Boyd Bowdish, Myung Cho, Stephen Cisneros, Chuck Claver, Julio Constanzo, Giovanni Corvetto, Holger Drass, Frossie Economou, Erik Dennihy, Alan Eisner, Juan Fabrega, Angelo Fausti Neto, Merlin Fisher-Levine, Ivan Gonzalez, Ronald Harris, Diane Hascall, Justine Haupt, Josh Hoblitt, James Howard, Mike Huffer, Tim Jenness, David Jiménez Mejías, Brian Johnson, Tony Johnson, K. Simon Krughoff, Craig Lage, Travis Lange, Ming Liang, Juan Lopez, Margaux Lopez, Robert Lupton, Guido Maulen, Felipe Menanteau, Neill Mills, Glenn Morris, Freddy Munoz, Homer Neal, Douglas Neill, Scott Newbry, Andrei Nomerotski, Dmitry Onoprienko, Ian Ordenes, Juan Orellana, Shawn Osier, HyeYun Park, Steve Pietrowicz, Andres Plazas, Gary Poczulp, Brian Qiu, Bruno Quint, Heinrich Reinking, Michael Reuter, Tiago Ribeiro, Rodrigo Rojas, Sandra Romero, Rafe Schindler, Bill Schoening, Jacques Sebag, Alysha Shugart, Cristian Silva, Ioana Sotuela, Anthony Tache, Diego Tapia, John Thayer, Sandrine Thomas, Roberto Tighe, Tei-Wei Tsai, Max Turri, Tony Tyson, Luis Vergara, Christopher Walter, Oliver Wiecha, Van Xiong

Proceedings Volume 12184, 121840J (2022) https://doi.org/10.1117/12.2630184

KEYWORDS: Cameras, Telescopes, Imaging systems, Observatories, Interfaces, Control systems, Safety, Electronics, Device simulation

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Proceedings Article | 29 August 2022 Poster

Design and analysis of the SiC solar telescope for extreme environments

Jihun Kim, Seonghwan Choi, Jeong-Yeol Han, Yunjong Kim, Ji-Hye Baek, Jongyeob Park, Heesu Yang, Sujin Kim, Young-Soo Kim, Jaegun Yoo, Youra Jun, Bi-Ho Jang, Il Kweon Moon, Dohoon Kim, Minkyum Kim, Gwanghui Jeong, Myung Cho

Proceedings Volume 12182, 1218233 (2022) https://doi.org/10.1117/12.2628857

KEYWORDS: Solar telescopes, Optical instrument design, Silicon carbide, Telescopes, Mirrors, Bridges, Off axis mirrors, Light scattering, Tolerancing, Temperature metrology

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Proceedings Article | 13 December 2020 Presentation + Paper

Rubin commissioning camera: integration, functional testing, and lab performance

Brian Stalder, Kevin Reil, Chuck Claver, Ming Liang, Tei Wei Tsai, Travis Lange, Justine Haupt, Oliver Wiecha, Margaux Lopez, Gary Poczulp, Diane Hascall, Douglas Neill, Jacques Sebag, Brian Johnson, Neill Mills, Myung Cho, Homer Neal, Scott Newbry, Shawn Osier, Rafe Schindler, Dmitry Onoprienko, Anthony Johnson, R. Glenn Morris, Max Turri, Alan Eisner, Stephen Cisneros, Van Xiong, Michael Huffer, Gregg Thayer, Ronald Harris, Anthony Borstad, Anthony Tache, William Schoening, J. Anthony Tyson, Craig Lage, Merlin Fisher-Levine, Robert Lupton, Andres Plazas, Felipe Menanteau, Htut Khine Htay Win, Stephen Pietrowicz, James Howard

Proceedings Volume 11447, 114470L (2020) https://doi.org/10.1117/12.2561132

KEYWORDS: Cameras, Large Synoptic Survey Telescope, Telescopes, Imaging systems, Optical instrument design, Electro optics, Sensors, Electronics, Control systems

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Proceedings Article | 13 December 2020 Poster + Presentation + Paper

Rubin Observatory primary tertiary mirror cell assembly: mirror support system modeling and tuning

Felipe Daruich, Douglas Neill, Myung Cho, Christoph Dribusch

Proceedings Volume 11445, 1144528 (2020) https://doi.org/10.1117/12.2561650

KEYWORDS: Mirrors, Systems modeling, Large Synoptic Survey Telescope, Actuators, Telescopes, Control systems, Computer simulations, Device simulation, Optical instrument design, Servomechanisms

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The Vera C. Rubin Observatory¹ⁱ is now under construction, on Cerro Pachón, in Chile. Its telescope has an 8.4 m primary tertiary mirror (M1M3), and has been designed to conduct a 10 years survey in which it will map the entire night sky every three nights. The support systems is composed by six Hardpoints and 156 pneumatic actuators. The Hardpoints define the mirror’s position in the mirror cell, and hold that position while observing in order to maintain the alignment of the telescope. The pneumatic actuators provides mirror support and figure correction, from optimizations provided by the Active Optics System (AOS). In order to complete the sky mapping in three nights the telescope mount has been designed to develop high accelerations that will allow it to change the observing field in just 2 seconds. The rapid telescope slews will apply high inertial forces on the mirror that have to be offloaded from the Hardpoints by the mirror's pneumatic actuators. This keeps the mirror safe during operations. For this reason, the support system has been optimized introducing innovative control concepts in both the Outer and Inner Loop, and the individual component. Extensive modeling of the control system dynamics has been developed to simulate and test different control architectures. Inner loop control systems were developed and tested using hardware-in-the-loop simulations which take advantage of the power of the modeling, using the real hardware components. This technique is especially suitable for complex real-time systems and allows for faster development time, with more precise results. The Outer Loop model has been used to tune the Hardpoints off-loading control system. The resulting parameters were used directly in the real system, once integration was completed, and worked as the simulations predicted. Gravity lookup- tables and inertial compensation forces, to counteract the high acceleration from the telescope mount, have also been included in the model. Simulations show the Hardpoints forces are far below their limits. This is particularly important, as we will not have the possibility to test the inertial compensation until the mirror cell is actually installed on the telescope mount. The simulations have provided encouraging results.

Proceedings Article | 10 September 2019 Presentation

Initial polishing machine control model to determine target TIF depth on SiC mirror surfaces (Conference Presentation)

Jeong-Yeol Han, Suyeon Cha, Dohoon Kim, Myung Cho

Proceedings Volume 11101, 111010A (2019) https://doi.org/10.1117/12.2529836

KEYWORDS: Silicon carbide, Mirrors, Surface finishing, Polishing, Polishing equipment, Process control, Reliability, Head

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Proceedings Article | 10 July 2018 Paper

Experimental study of breakaway system for the fast-steering secondary mirror prototype of GMT

Yunjong Kim, Wongi Lee, Chanhee Lee, Myung K. Cho, Christoph Dribusch, Sungho Lee, Sanghyuk Kim, Chang-Hee Kim, Ueejeong Jeong, Jeong-Yeol Han, Bong-Kon Moon, Chan Park, Byeong-Gon Park, Youra Jun, Jieun Ryu, Gary Poczulp, Ming Liang, Il-Kwon Moon, Ho-Sang Kim, Paul Gardner, Robert Bernier, Frank Groark, Hugo Chiquito

Proceedings Volume 10706, 107064A (2018) https://doi.org/10.1117/12.2311779

KEYWORDS: Mirrors, Prototyping, Telescopes, Actuators, Earthquakes, Space telescopes, 3D modeling, Astronomy, Large telescopes, Seismic sensors

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Proceedings Article | 10 July 2018 Presentation + Paper

Design of the fast steering secondary mirror assembly for the Giant Magellan Telescope

Myung Cho, Youra Jun, Christoph Dribusch, Jieun Ryu, Gary Poczulp, Ming Liang, Sungho Lee, Jeong-Yeol Han, Ueejeong Jeong, Sanghyuk Kim, Bongkon Moon, Chang-Hee Kim, Yunjong Kim, Chan Park, Byeong-Gon Park, Il-Kwon Moon, Chan-Hee Lee, Wongi Lee, Ho-Sang Kim, Paul Gardner, Robert Bernier, Frank Groark, Hugo Chiquito

Proceedings Volume 10706, 1070607 (2018) https://doi.org/10.1117/12.2313375

KEYWORDS: Mirrors, Telescopes, Actuators, Space telescopes, Off axis mirrors, Integrated modeling, Interfaces, Optical instrument design, Phase transfer function, Control systems

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Proceedings Article | 10 July 2018 Presentation + Paper

Control modeling of the fast-steering secondary mirror for GMT

Christoph Dribusch, Myung Cho, Youra Jun, Jieun Ryu, Gary Poczulp, Ming Liang, Sungho Lee, Jeong-Yeol Han, Ueejeong Jeong, Sanghyuk Kim, Bong-Kon Moon, Chang-Hee Kim, Yunjong Kim, Chan Park, Byeong-Gon Park, Il-Kwon Moon, Chanhee Lee, Wongi Lee, Ho-Sang Kim, Paul Gardner, Robert Bernier, Frank Groark, Hugo Chiquito

Proceedings Volume 10705, 107050Z (2018) https://doi.org/10.1117/12.2313351

KEYWORDS: Mirrors, Actuators, Telescopes, Secondary tip-tilt mirrors, Motion models, Astronomy, Simulink, Control systems, Piezoelectric drives, Piezoelectric driven mechanisms

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Proceedings Article | 6 July 2018 Paper

Development status of the fast-steering secondary mirror of GMT

Sungho Lee, Jeong-Yeol Han, Ueejeong Jeong, Sanghyuk Kim, Bong-Kon Moon, Chang-Hee Kim, Yunjong Kim, Chan Park, Byeong-Gon Park, Myung Cho, Christoph Dribusch, Youra Jun, Jieun Ryu, Gary Poczulp, Ming Liang, Il Kweon Moon, Chanhee Lee, Wongi Lee, Ho-Sang Kim, Paul Gardner, Robert Bernier, Frank Groark, Hugo Chiquito

Proceedings Volume 10700, 1070044 (2018) https://doi.org/10.1117/12.2313174

KEYWORDS: Mirrors, Telescopes, Control systems design, Actuators, Control systems, Off axis mirrors

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Proceedings Article | 6 July 2018 Paper

Preliminary AIT plan for the FSM segments of GMT

Jeong-Yeol Han, Sungho Lee, Sanghyuk Kim, Yunjong Kim, Ueejeong Jeong, Myung Cho, Christoph Dribusch, Bong-Kon Moon, Chang-Hee Kim, Chan Park, Byeong-Gon Park, Youra Jun, Jieun Ryu, Gary Poczulp, Ming Liang, Il-Kwon Moon, Chanhee Lee, Wongi Lee, Ho-Sang Kim, Paul Gardner, Robert Bernier, Frank Groark, Hugo Chiquito

Proceedings Volume 10700, 107002D (2018) https://doi.org/10.1117/12.2314292

KEYWORDS: Mirrors, Assembly tolerances, Safety, Integrated optics, Optical testing, Tolerancing

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Proceedings Article | 6 July 2018 Paper

Tip-tilt performance test of FSMP for development of the GMT FSM

Sanghyuk Kim, Chang-Hee Kim, Ueejeong Jeong, Sungho Lee, Won Gi Lee, Chan-Hee Lee, Il-Kwon Moon, Jeong-Yeol Han, Yunjong Kim, Bongkon Moon, Myung Kyu Cho, Byeong-Gon Park, Chan Park, Ho-Sang Kim, Paul Gardner, Robert Bernier, Frank Groark, Hugo Chiquito

Proceedings Volume 10700, 107003P (2018) https://doi.org/10.1117/12.2311774

KEYWORDS: Mirrors, Actuators, Sensors, Secondary tip-tilt mirrors, Prototyping

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Proceedings Article | 6 July 2018 Paper

LSST M1M3 active mirror support system optimized to accommodate rapid telescope motions

Felipe Daruich, Douglas Neill, Michael Warner, Edward Hileman, Myung Cho, Christoph Dribusch, Constanza Araujo, Michael Booth, Christopher Contaxis, Ron Harris, Brian Johnson, Garry Knight, Neill Mills, Gary Muller, Edward Stover, Oliver Wiecha, Bo Xin

Proceedings Volume 10700, 107003G (2018) https://doi.org/10.1117/12.2313724

KEYWORDS: Actuators, Mirrors, Telescopes, Control systems, Large Synoptic Survey Telescope, Sensors, Systems modeling, Active optics

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Proceedings Article | 19 August 2016 Paper

LSST telescope modeling overview

J. Sebag, J. Andrew, G. Angeli, C. Araujo, J. Barr, S. Callahan, M. Cho, C. Claver, F. Daruich, W. Gressler, E. Hileman, M. Liang, G. Muller, D. Neill, W. Schoening, M. Warner, O. Wiecha, B. Xin, Alfredo Orden Martinez, Manuel Perezagua Aguado, Luis García Marchena, Ismael Ruiz de Argandoña

Proceedings Volume 9911, 99112E (2016) https://doi.org/10.1117/12.2233178

KEYWORDS: Telescopes, Finite element methods, Systems modeling, Solid modeling, Mirrors, Actuators, 3D modeling, Large Synoptic Survey Telescope, Computer aided design, Large Synoptic Survey Telescope, Space telescopes

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Proceedings Article | 10 August 2016 Paper

An integrated modeling framework for the Large Synoptic Survey Telescope (LSST)

G. Angeli, B. Xin, C. Claver, M. Cho, C. Dribusch, D. Neill, J. Peterson, J. Sebag, S. Thomas

Proceedings Volume 9911, 991118 (2016) https://doi.org/10.1117/12.2234078

KEYWORDS: Large Synoptic Survey Telescope, Systems modeling, Atmospheric optics, Image quality, Atmospheric modeling, Large Synoptic Survey Telescope, Wavefront sensors, Point spread functions, Telescopes, Sensors, Cameras

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Proceedings Article | 8 August 2016 Paper

LSST primary/tertiary monolithic mirror

J. Sebag, W. Gressler, M. Liang, D. Neill, C. Araujo-Hauck, J. Andrew, G. Angeli, M. Cho, C. Claver, F. Daruich, C. Gessner, E. Hileman, V. Krabbendam, G. Muller, G. Poczulp, R. Repp, O. Wiecha, B. Xin, K. Kenagy, H. Martin, M. Tuell, S. West

Proceedings Volume 9906, 99063E (2016) https://doi.org/10.1117/12.2230012

KEYWORDS: Mirrors, Large Synoptic Survey Telescope, Polishing, Image quality, Surface finishing, Mirrors, Large Synoptic Survey Telescope, Polishing, Optical design, Finite element methods, Interferometry, Cameras, Actuators

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Proceedings Article | 27 July 2016 Paper

Characterizing the vibration environments of the Gemini telescopes

T. Hayward, M. Rippa, H. Bonnet, C. Cavedoni, R. Galvez, G. Gausachs, M. Cho

Proceedings Volume 9906, 99065N (2016) https://doi.org/10.1117/12.2232140

KEYWORDS: Cryocoolers, Mirrors, Telescopes, Gemini Observatory, Adaptive optics, Cryocoolers, Gemini Planet Imager, Mirrors, Fluctuations and noise, Chromium, Ions, Sensors

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Proceedings Article | 22 July 2016 Paper

Development of the fast steering secondary mirror assembly of GMT

Sungho Lee, Myung Cho, Chan Park, Jeong-Yeol Han, Ueejeong Jeong, Yang-noh Yoon, Je Heon Song, Byeong-Gon Park, Christoph Dribusch, Won Hyun Park, Youra Jun, Ho-Soon Yang, Il-Kwon Moon, Chang Jin Oh, Ho-Sang Kim, Kyoung-Don Lee, Robert Bernier, Chris Alongi, Andrew Rakich, Paul Gardner, Lee Dettmann, Wylie Rosenthal

Proceedings Volume 9912, 991241 (2016) https://doi.org/10.1117/12.2233710

KEYWORDS: Mirrors, Telescopes, Optical fabrication, Telescopes, Control systems, Prototyping, Control systems design, Space telescopes, Surface finishing, Manufacturing, Profilometers

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Proceedings Article | 17 September 2015 Paper

Development of a FSMP mirror assembly

Jihun Kim, Young-Soo Kim, Je Heon Song, Myung Cho, Ho-Soon Yang, Joohyung Lee, Ho-Sang Kim, Kyoung-Don Lee, Won Hyun Park, Byeong-Gon Park

Proceedings Volume 9582, 95820K (2015) https://doi.org/10.1117/12.2191184

KEYWORDS: Mirrors, Secondary tip-tilt mirrors, Space telescopes, Telescopes, Adhesives, System integration, Tolerancing, Standards development, Astronomy, Prototyping

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Proceedings Article | 7 August 2014 Paper

On-sky vibration environment for the Gemini Planet Imager and mitigation effort

Markus Hartung, Tom Hayward, Les Saddlemyer, Lisa Poyneer, Andrew Cardwell, Chas Cavedoni, Myung Cho, Jeffrey Chilcote, Paul Collins, Daren Dillon, Ramon Galvez, Gaston Gausachs, Stephen Goodsell, Andrés Guesalaga, Pascale Hibon, James Larkin, Bruce Macintosh, Dave Palmer, Naru Sadakuni, Dmitry Savransky, Andrew Serio, Fredrik Rantakyrö, Kent Wallace

Proceedings Volume 9148, 91480N (2014) https://doi.org/10.1117/12.2057200

KEYWORDS: Gemini Planet Imager, Telescopes, Cryocoolers, Sensors, Mirrors, Gemini Observatory, Wavefronts, Adaptive optics, Observatories, Iterated function systems

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Proceedings Article | 22 July 2014 Paper

Development of GMT fast steering secondary mirror assembly

Myung Cho, Andrew Corredor, Christoph Dribusch, Won Hyun Park, Gary Muller, Matt Johns, Charlie Hull, Jonathan Kern, Young-Soo Kim

Proceedings Volume 9145, 91451M (2014) https://doi.org/10.1117/12.2056533

KEYWORDS: Mirrors, Telescopes, Actuators, Sensors, Prototyping, Off axis mirrors, Space telescopes, Optical instrument design, Optical fabrication, Finite element methods

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Proceedings Article | 18 September 2013 Paper

Flexure design development for a fast steering mirror

Won Hyun Park, Andrew Corredor, Myung Cho, Young-Soo Kim, Ho-Sang Kim, Kyoung-Don Lee

Proceedings Volume 8836, 88360W (2013) https://doi.org/10.1117/12.2025409

KEYWORDS: Mirrors, Finite element methods, Distortion, Telescopes, Interferometers, Monochromatic aberrations, Computer aided design, Phase shifting, Spherical lenses, Space telescopes

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Proceedings Article | 18 September 2013 Paper

Optomechanical analysis and testing of a fast steering secondary mirror prototype for the Giant Magellan Telescope

Andrew Corredor, Won Hyun Park, Myung Cho, Young-Soo Kim

Proceedings Volume 8836, 88360U (2013) https://doi.org/10.1117/12.2024141

KEYWORDS: Mirrors, Finite element methods, Telescopes, Neodymium, Thermography, Analytical research, Optical fabrication, Thermal modeling, Epoxies, Prototyping

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Proceedings Article | 18 September 2013 Paper

Development of the fast steering secondary mirror for the Giant Magellan Telescope

Myung Cho, Andrew Corredor, Christoph Dribusch, Won-Hyun Park, Gary Muller, Matt Johns, Charlie Hull, Michael Sheehan, Jonathan Kern, Young Soo Kim, Eric Hansen, Seongdo Kim

Proceedings Volume 8836, 88360V (2013) https://doi.org/10.1117/12.2024164

KEYWORDS: Mirrors, Telescopes, Space telescopes, Off axis mirrors, Image segmentation, Image quality, Finite element methods, Optical instrument design, Thermal effects, 3D modeling

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Proceedings Article | 15 October 2012 Paper

Development status of the prototype of the GMT fast steering mirror

Young-Soo Kim, Ju Heon Koh, Inwoo Chung, Myung Cho, Ho-Soon Yang, Ho-Sang Kim, Hyo-Sung Ahn, Inwoo Han, Jaemann Kyeong, Moo-Young Chun, Byeong-Gon Park

Proceedings Volume 8415, 84150B (2012) https://doi.org/10.1117/12.2002577

KEYWORDS: Mirrors, Prototyping, Space telescopes, Telescopes, Off axis mirrors, Astronomy, Image segmentation, Actuators, Space mirrors, Observatories

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Proceedings Article | 25 September 2012 Paper

Wind responses of the LSST secondary mirror

Myung Cho, Konstantinos Vogiatzis, Jacques Sebag, Douglas Neill

Proceedings Volume 8449, 844905 (2012) https://doi.org/10.1117/12.926649

KEYWORDS: Mirrors, Large Synoptic Survey Telescope, Telescopes, Adaptive optics, Image quality, Systems modeling, Wind energy, Active optics, Actuators, Finite element methods

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Proceedings Article | 17 September 2012 Paper

Performance prediction of the fast steering secondary mirror for the Giant Magellan Telescope

Myung Cho, Andrew Corredor, Christoph Dribusch, Won-Hyun Park, Michael Sheehan, Matt Johns, Stephen Shectman, Jonathan Kern, Charlie Hull, Young-Soo Kim, John Bagnasco

Proceedings Volume 8444, 844424 (2012) https://doi.org/10.1117/12.926374

KEYWORDS: Mirrors, Telescopes, Image segmentation, Image quality, Space telescopes, Off axis mirrors, Thermal effects, Optical instrument design, Finite element methods, Error analysis

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Proceedings Article | 17 September 2012 Paper

Development of a fast steering secondary mirror prototype for the Giant Magellan Telescope

Myung Cho, Andrew Corredor, Christoph Dribusch, Kwijong Park, Young-Soo Kim, Il-Kweon Moon, Won Hyun Park

Proceedings Volume 8444, 844420 (2012) https://doi.org/10.1117/12.926643

KEYWORDS: Mirrors, Telescopes, Space telescopes, Off axis mirrors, Prototyping, Optical fabrication, Actuators, Astronomy, Solids, Lightweight mirrors

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Proceedings Article | 10 November 2011 Paper

Integrated modeling and systems engineering for the Thirty Meter Telescope

George Angeli, Konstantinos Vogiatzis, Doug MacMynowski, Byoung-Joon Seo, Carl Nissly, Mitchell Troy, Myung Cho

Proceedings Volume 8336, 833605 (2011) https://doi.org/10.1117/12.919363

KEYWORDS: Telescopes, Systems modeling, Observatories, Performance modeling, Systems engineering, Stochastic processes, Adaptive optics, Mathematical modeling, Integrated modeling, Thirty Meter Telescope

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Proceedings Article | 10 November 2011 Paper

Thermal modeling of the TMT Telescope

Myung Cho, Andrew Corredor, Konstantinos Vogiatzis, George Angeli

Proceedings Volume 8336, 83360V (2011) https://doi.org/10.1117/12.915634

KEYWORDS: Telescopes, Mirrors, Convection, Thermal modeling, Finite element methods, Actuators, Thermal analysis, Space telescopes, Thermography, Thirty Meter Telescope

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Proceedings Article | 10 November 2011 Paper

High fidelity optical modeling for the TMT

Carl Nissly, Byoung-Joon Seo, Mitchell Troy, George Angeli, Myung Cho, Brent Ellerbroek, Piotr Piatrou, Lewis Roberts, J. Shelton, Lianqi Wang

Proceedings Volume 8336, 83360B (2011) https://doi.org/10.1117/12.918708

KEYWORDS: Device simulation, Telescopes, Wavefronts, Adaptive optics, Mirrors, MATLAB, Error analysis, Systems modeling, Wavefront sensors, Sensors

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Proceedings Article | 24 September 2011 Paper

Design and development of a fast-steering secondary mirror for the Giant Magellan Telescope

Myung Cho, Andrew Corredor, Christoph Dribusch, Kwijong Park, Young-Soo Kim, Il-Kweon Moon

Proceedings Volume 8125, 812505 (2011) https://doi.org/10.1117/12.892411

KEYWORDS: Mirrors, Telescopes, Space telescopes, Image segmentation, Image quality, Optical instrument design, Lightweight mirrors, Finite element methods, Thermal modeling, Surface finishing

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Proceedings Article | 15 September 2011 Paper

Wide-field telescope design for the KMTNet project

Seung-Lee Kim, Byeong-Gon Park, Chung-Uk Lee, Larry Kappler, Nathan Kappler, Wade Poteet, Harold Cauthen, Dan Blanco, Richard Buchroeder, Jose Teran, Scott Freestone, Jong-Ung Lee, Myung Cho, In-Soo Yuk, Moo-Young Chun, Ho Jin, Sang-Mok Cha

Proceedings Volume 8151, 81511B (2011) https://doi.org/10.1117/12.894212

KEYWORDS: Mirrors, Telescopes, Coating, Space telescopes, Planets, Stars, Aluminum, Actuators, Exoplanets, Reflectivity

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Proceedings Article | 5 August 2010 Paper

Thermal analysis of the TMT telescope structure

Myung Cho, Andrew Corredor, Konstantinos Vogiatzis, George Angeli

Proceedings Volume 7738, 77380C (2010) https://doi.org/10.1117/12.857265

KEYWORDS: Telescopes, Convection, Thermal modeling, Thermal analysis, Finite element methods, Actuators, Mirrors, Systems modeling, Space telescopes, Thirty Meter Telescope

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Proceedings Article | 4 August 2010 Paper

Investigation of Thirty Meter Telescope wavefront maintenance using low-order Shack-Hartmann wavefront sensors to correct for thermally-induced misalignments

Carl Nissly, Byoung-Joon Seo, Mitchell Troy, George Angeli, Myung Cho, Chris Shelton, Norbert Sigrist, Mark Sirota

Proceedings Volume 7738, 77380H (2010) https://doi.org/10.1117/12.857849

KEYWORDS: Telescopes, Wavefronts, Wavefront sensors, Device simulation, Systems modeling, Control systems, Thermal modeling, Image quality, Mirrors, Thirty Meter Telescope

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Proceedings Article | 1 October 2009 Paper

Thermal performance prediction of the TMT telescope structure

Myung Cho, Andrew Corredor, Konstantinos Vogiatzis, George Angeli

Proceedings Volume 7427, 74270E (2009) https://doi.org/10.1117/12.828057

KEYWORDS: Telescopes, Convection, Finite element methods, Thermal modeling, Thermal analysis, Space telescopes, Electronics, Control systems, Systems modeling, Thirty Meter Telescope

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Proceedings Article | 10 September 2009 Paper

Performance prediction of the LSST secondary mirror

Myung Cho, Ming Liang, Douglas Neill

Proceedings Volume 7424, 742407 (2009) https://doi.org/10.1117/12.823716

KEYWORDS: Mirrors, Large Synoptic Survey Telescope, Telescopes, Adaptive optics, Active optics, Error analysis, Space telescopes, Optical calibration, Wavefronts, Monochromatic aberrations

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Proceedings Article | 23 July 2008 Paper

Performance prediction of the TMT secondary mirror support system

Myung Cho

Proceedings Volume 7018, 70181S (2008) https://doi.org/10.1117/12.789286

KEYWORDS: Mirrors, Adaptive optics, Active optics, Telescopes, Error analysis, Monochromatic aberrations, Optical calibration, Surface finishing, Actuators, Thirty Meter Telescope

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Proceedings Article | 23 July 2008 Paper

Performance prediction of the TMT tertiary mirror support system

Myung Cho

Proceedings Volume 7018, 70184F (2008) https://doi.org/10.1117/12.789292

KEYWORDS: Adaptive optics, Mirrors, Active optics, Actuators, Telescopes, Error analysis, Surface finishing, Monochromatic aberrations, Solids, Thirty Meter Telescope

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Proceedings Article | 16 July 2008 Paper

Thermal performance prediction of the TMT optics

Myung Cho, Andrew Corredor, Shane Pootrakul, Konstantinos Vogiatzis, George Angeli

Proceedings Volume 7017, 701716 (2008) https://doi.org/10.1117/12.789212

KEYWORDS: Mirrors, Convection, Thermal modeling, Thermography, Heat flux, Finite element methods, Thermal analysis, Actuators, Phase transfer function, Thirty Meter Telescope

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Proceedings Article | 21 November 2007 Paper

Thermal performance of the ATST secondary mirror

Myung Cho, Joe DeVries, Eric Hansen

Proceedings Volume 6721, 672102 (2007) https://doi.org/10.1117/12.782674

KEYWORDS: Mirrors, Convection, Heat flux, Thermography, Thermal modeling, Silicon carbide, Finite element methods, Off axis mirrors, Thermal analysis, Telescopes

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Proceedings Article | 17 September 2007 Paper

Performance evaluations of the ATST secondary mirror

Myung Cho, Joseph DeVries, Eric Hansen

Proceedings Volume 6665, 66650Q (2007) https://doi.org/10.1117/12.730966

KEYWORDS: Mirrors, Convection, Heat flux, Thermography, Thermal modeling, Off axis mirrors, Telescopes, Finite element methods, Surface finishing, Silicon carbide

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Proceedings Article | 6 July 2006 Paper

Development of the primary mirror segment support assemblies for the Thirty Meter Telescope

Eric Ponslet, Dan Blanco, Myung Cho, Terry Mast, Jerry Nelson, R. J. Ponchione, Mark Sirota, Vince Stephens, Larry Stepp, Alan Tubb, Eric Williams

Proceedings Volume 6273, 627319 (2006) https://doi.org/10.1117/12.670604

KEYWORDS: Actuators, Mirrors, Telescopes, Glasses, Monochromatic aberrations, Optical instrument design, Space telescopes, Phase modulation, Error analysis, Thirty Meter Telescope

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Proceedings Article | 6 July 2006 Paper

Optimization of the ATST primary mirror support system

Myung Cho, Ronald Price, Il Moon

Proceedings Volume 6273, 62731E (2006) https://doi.org/10.1117/12.669865

KEYWORDS: Mirrors, Active optics, Thermal effects, Off axis mirrors, Telescopes, Finite element methods, Optical calibration, Actuators, Optics manufacturing, Astronomy

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Proceedings Article | 6 July 2006 Paper

Control and support of 4-meter class secondary and tertiary mirrors for the Thirty Meter Telescope

Dan Blanco, Myung Cho, Larry Daggert, Phil Daly, Joe DeVries, Jonathan Elias, Bruce Fitz-Patrick, Ed Hileman, Mark Hunten, Ming Liang, Mark Nickerson, Earl Pearson, Dave Rosin, Mark Sirota, Larry Stepp

Proceedings Volume 6273, 62731A (2006) https://doi.org/10.1117/12.672626

KEYWORDS: Mirrors, Actuators, Telescopes, Active optics, Control systems, Computer programming, Systems modeling, Adaptive optics, Monochromatic aberrations, Thirty Meter Telescope

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Proceedings Article | 27 June 2006 Paper

A conceptual design for the Thirty Meter Telescope adaptive optics systems

B. Ellerbroek, C. Boyer, C. Bradley, M. Britton, S. Browne, R. Buchroeder, J.-L. Carel, M. Cho, M. Chun, R. Clare, R. Conan, L. Daggert, R. Dekany, J. Elias, D. Erickson, R. Flicker, D. Gavel, L. Gilles, P. Hampton, G. Herriot, M. Hunten, R. Joyce, M. Liang, B. Macintosh, R. Palomo, I. Powell, S. Roberts, E. Ruch, J.-C. Sinquin, M. Smith, J. Stoesz, M. Troy, G. Tyler, J.-P. Veran, C. Vogel, Q. Yang

Proceedings Volume 6272, 62720D (2006) https://doi.org/10.1117/12.669422

KEYWORDS: Adaptive optics, Telescopes, Mirrors, Laser guide stars, Wavefronts, Wavefront sensors, Stars, Control systems, Imaging spectroscopy, Imaging systems

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Proceedings Article | 23 June 2006 Paper

The Advanced Technology Solar Telescope mount assembly

Mark Warner, Myung Cho, Bret Goodrich, Eric Hansen, Rob Hubbard, Joon Pyo Lee, Jeremy Wagner

Proceedings Volume 6267, 62673C (2006) https://doi.org/10.1117/12.669866

KEYWORDS: Telescopes, Space telescopes, Mirrors, Solar telescopes, Optical instrument design, Control systems, Finite element methods, Fourier transforms, Observatories, Off axis mirrors

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Proceedings Article | 9 September 2005 Paper

Opto-mechanical design of a beam launch telescope

Il Moon, Soosang Lee, Myung Cho

Proceedings Volume 5877, 58770I (2005) https://doi.org/10.1117/12.615155

KEYWORDS: Mirrors, Telescopes, Thermography, Finite element methods, Optomechanical design, Optical instrument design, Wavefronts, Optical components, Lightweight mirrors, Acoustics

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Proceedings Article | 9 September 2005 Paper

Structural analysis for the 4-m Advanced Technology Solar Telescope (ATST)

Myung Cho, Mark Warner, Joon Lee

Proceedings Volume 5877, 58770O (2005) https://doi.org/10.1117/12.613281

KEYWORDS: Telescopes, Mirrors, Optical instrument design, Motion models, Off axis mirrors, Finite element methods, Gemini Observatory, Optical components, Solar telescopes, Astronomy

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Proceedings Article | 29 September 2004 Paper

Wind-induced structural response of a large telescope

David Smith, Peter Avitabile, Geoff Gwaltney, Myung Cho, Michael Sheehan

Proceedings Volume 5495, (2004) https://doi.org/10.1117/12.550465

KEYWORDS: Telescopes, Wind measurement, Gemini Observatory, Mirrors, Sensors, Large telescopes, Electroluminescence, Transducers, Space telescopes, Velocity measurements

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Proceedings Article | 29 September 2004 Paper

LSST primary, secondary, and tertiary mirror support systems

Brian Cuerden, Jacques Sebag, Scott Mathews, Myung Cho, Joon Lee, Steven West

Proceedings Volume 5495, (2004) https://doi.org/10.1117/12.550637

KEYWORDS: Mirrors, Actuators, Large Synoptic Survey Telescope, Monochromatic aberrations, Finite element methods, Error analysis, Interfaces, Telescopes, Observatories, Astronomy

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Proceedings Article | 22 January 2004 Paper

Integrated modeling tools for large ground-based optical telescopes

George Angeli, Anna Segurson, Robert Upton, Brooke Gregory, Myung Cho

Proceedings Volume 5178, (2004) https://doi.org/10.1117/12.506438

KEYWORDS: Telescopes, Integrated modeling, Mirrors, Device simulation, Space telescopes, Code v, Operating systems, Systems modeling, Ray tracing, Data modeling

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Proceedings Article | 4 February 2003 Paper

Wind loading of large telescopes

Myung K. Cho, Larry Stepp, George Angeli, David Smith

Proceedings Volume 4837, (2003) https://doi.org/10.1117/12.458191

KEYWORDS: Mirrors, Telescopes, Gemini Observatory, Wind measurement, Turbulence, Large telescopes, Optical instrument design, Segmented mirrors, Sensors, Image segmentation

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Proceedings Article | 4 February 2003 Paper

Optical performance of bimetallic mirrors under lateral temperature distributions

Il-Kwon Moon, Myung K. Cho, Ralph Richard

Proceedings Volume 4837, (2003) https://doi.org/10.1117/12.458678

KEYWORDS: Mirrors, Plating, Aluminum, Nickel, Beryllium, Finite element methods, Shape analysis, Distortion, Error analysis, Thermal analysis

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Proceedings Article | 30 January 2003 Paper

Active optics and control architecture for a giant segmented mirror telescope

George Angeli, Myung K. Cho, Mark Whorton

Proceedings Volume 4840, (2003) https://doi.org/10.1117/12.459850

KEYWORDS: Telescopes, Mirrors, Sensors, Actuators, Adaptive optics, Control systems, Active optics, Device simulation, Wind measurement, Gemini Observatory

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Proceedings Article | 30 January 2003 Paper

Dynamic modeling of turbulent shedding effect on the 30-m primary mirror of GSMT

Guanpeng Xu, Mark Whorton, Yong Tao, Myung K. Cho

Proceedings Volume 4840, (2003) https://doi.org/10.1117/12.458038

KEYWORDS: Mirrors, Turbulence, Telescopes, Space telescopes, 3D modeling, Particles, Visualization, Velocity measurements, Astronomy, Wind energy

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Proceedings Article | 30 July 2002 Paper

Characterization of wind loading of telescopes

George Angeli, Myung K. Cho, Mike Sheehan, Larry Stepp

Proceedings Volume 4757, (2002) https://doi.org/10.1117/12.489825

KEYWORDS: Mirrors, Telescopes, Turbulence, Sensors, Gemini Observatory, Mirror pointing, Wind energy, Large telescopes, Atmospheric optics, Space telescopes

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Proceedings Article | 27 December 2001 Paper

Development of optimal grinding and polishing tools for aspheric surfaces

James Burge, Bill Anderson, Scott Benjamin, Myung K. Cho, Koby Smith, Martin Valente

Proceedings Volume 4451, (2001) https://doi.org/10.1117/12.453615

KEYWORDS: Surface finishing, Polishing, Aspheric lenses, Monochromatic aberrations, Spherical lenses, Optics manufacturing, Metals, Interfaces, Aluminum, Finite element methods

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Proceedings Article | 5 November 2001 Paper

Wind buffeting effects on the Gemini 8-m primary mirrors

Myung K. Cho, Larry Stepp, Seongho Kim

Proceedings Volume 4444, (2001) https://doi.org/10.1117/12.447310

KEYWORDS: Mirrors, Sensors, Telescopes, Wind measurement, Gemini Observatory, Domes, Distortion, Large telescopes, Optical instrument design, Calibration

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Proceedings Article | 5 November 2001 Paper

Optical performance of bimetallic mirrors under thermal environment

Il-Kwon Moon, Myung K. Cho, Ralph Richard

Proceedings Volume 4444, (2001) https://doi.org/10.1117/12.447319

KEYWORDS: Mirrors, Plating, Aluminum, Nickel, Beryllium, Aberration correction, Finite element methods, Error analysis, Thermography, Chemical elements

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Proceedings Article | 20 July 2000 Paper

Effect of Gemini primary mirror position relative to the lateral support on mirror figure

Myung K. Cho, Larry Stepp

Proceedings Volume 4003, (2000) https://doi.org/10.1117/12.391507

KEYWORDS: Mirrors, Telescopes, Gemini Observatory, Monochromatic aberrations, Optical alignment, Active optics, Spherical lenses, Systems modeling, Wavefront sensors, Stars

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Proceedings Article | 21 August 1998 Paper

Design of the Gemini near-infrared spectrometer

Jonathan Elias, Daniel Vukobratovich, John Andrew, Myung K. Cho, Randy Cuberly, Ken Don, Allen Gerzoff, Charles Harmer, D. Harris, Julie Heynssens, J. Hicks, A. Kovacs, Cheng Li, M. Liang, Il-Kwon Moon, Earl Pearson, G. Plum, Nicolas Roddier, Janet Tvedt, Richard Wolff, Woon-Yin Wong

Proceedings Volume 3354, (1998) https://doi.org/10.1117/12.317281

KEYWORDS: Cameras, Mirrors, Telescopes, Spectroscopy, Gemini Observatory, Sensors, Prisms, Optical filters, Light scattering, Relays

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Proceedings Article | 21 August 1998 Paper

Design study of the GNIRS bracket structure

Myung K. Cho, Cheng Li, Woon-Yin Wong, Randy Cuberly, Il-Kwon Moon

Proceedings Volume 3354, (1998) https://doi.org/10.1117/12.317237

KEYWORDS: Mirrors, Cameras, Optical components, Telescopes, Sensors, Collimators, Finite element methods, Gemini Observatory, Interfaces, Motion estimation

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Proceedings Article | 13 October 1997 Paper

Therm-optic analysis of bi-metallic mirrors

Daniel Vukobratovich, Allen Gerzoff, Myung K. Cho

Proceedings Volume 3132, (1997) https://doi.org/10.1117/12.284079

KEYWORDS: Mirrors, Plating, Thermography, Nickel, Metals, Aluminum, Finite element methods, Information operations, Error analysis, Temperature metrology

Proceedings Article | 21 March 1997 Paper

Active optics performance study of the primary mirror of the Gemini Telescopes Project

Myung K. Cho

Proceedings Volume 2871, (1997) https://doi.org/10.1117/12.269050

KEYWORDS: Active optics, Mirrors, Gemini Observatory, Telescopes, Actuators, Kinematics, Finite element methods, Algorithm development, Matrices, Systems modeling

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Proceedings Article | 11 November 1996 Paper

Thermal analysis on hex-placement patterns of the Gemini primary mirrors

Myung K. Cho, William Powell

Proceedings Volume 2857, (1996) https://doi.org/10.1117/12.258296

KEYWORDS: Mirrors, Active optics, Distortion, Optical calibration, Thermography, Gemini Observatory, Thermal analysis, Image quality, Thermal effects, Finite element methods

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Proceedings Article | 6 September 1995 Paper

Design study of a KAO telescope with a 1-m double-arch primary mirror

Il Kweon Moon, In Woo Han, Byung-Soo Chang, Hyun Kyu Kim, Myung K. Cho

Proceedings Volume 2542, (1995) https://doi.org/10.1117/12.218661

KEYWORDS: Mirrors, Telescopes, Optical instrument design, Space telescopes, Wavefronts, Finite element methods, Zerodur, Mirror pointing, Device simulation, Astronomical telescopes

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Proceedings Article | 1 June 1994 Paper

Gemini primary mirror support system

Larry Stepp, Eugene Huang, Myung K. Cho

Proceedings Volume 2199, (1994) https://doi.org/10.1117/12.176192

KEYWORDS: Mirrors, Gemini Observatory, Telescopes, Active optics, Distortion, Error analysis, Optical instrument design, Control systems, Distributed computing, Kinematics

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Proceedings Article | 1 June 1994 Paper

Optimization strategy of axial and lateral supports for large primary mirrors

Myung K. Cho

Proceedings Volume 2199, (1994) https://doi.org/10.1117/12.176256

KEYWORDS: Mirrors, Active optics, Gemini Observatory, Optimization (mathematics), Finite element methods, Telescopes, Matrices, Actuators, Optical calibration, Mirror pointing

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Proceedings Article | 1 December 1991 Paper

Surface distortions of a 3.5-meter mirror subjected to thermal variations

Myung K. Cho, Gary Poczulp

Proceedings Volume 1532, (1991) https://doi.org/10.1117/12.48261

KEYWORDS: Mirrors, Mathematical modeling, Thermography, Finite element methods, Active optics, Thermal effects, Temperature metrology, Actuators, Mirror structures, Infrared sensors

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Proceedings Article | 1 December 1991 Paper

Active optics system for a 3.5-meter structured mirror

Larry Stepp, Nicolas Roddier, David Dryden, Myung K. Cho

Proceedings Volume 1542, (1991) https://doi.org/10.1117/12.48805

KEYWORDS: Mirrors, Active optics, Control systems, Mirror structures, Telescopes, Polishing, Finite element methods, Actuators, Adaptive optics, Computing systems

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Proceedings Article | 1 November 1990 Paper

Comparison of performance of lightweight mirrors

Myung K. Cho, Ralph Richard, Edward Hileman

Proceedings Volume 1340, (1990) https://doi.org/10.1117/12.23036

KEYWORDS: Mirrors, Wavefronts, Lightweight mirrors, Solids, Space mirrors, Shape analysis, Optical cryogenics, Fringe analysis, Thermography, Finite element methods

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Proceedings Article | 1 October 1990 Paper

Structural and optical properties for typical solid mirror shapes

Myung K. Cho, Ralph Richard

Proceedings Volume 1303, (1990) https://doi.org/10.1117/12.21541

KEYWORDS: Mirrors, Chemical elements, Solids, Systems modeling, Wavefronts, Shape analysis, Finite element methods, Optical properties, Performance modeling, Data modeling

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