Dr. Chen Liang Profile

Dr. Chen Liang

Optical Engineering Manager

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Publications (10)

Proceedings Article | 6 July 2018 Paper

Construction update of the Daniel K. Inouye Solar Telescope project

Mark Warner, Thomas Rimmele, Valentin Pillet, Roberto Casini, Steve Berukoff, Simon Craig, Andrew Ferayorni, Bret Goodrich, Robert Hubbard, David Harrington, Paul Jeffers, Erik Johansson, Ruth Kneale, Jeff Kuhn, Chen Liang, Haosheng Lin, Heather Marshall, Mihalis Mathioudakis, William McBride, Joseph McMullin, William McVeigh, Predrag Sekulic, Wolfgang Schmidt, Steve Shimko, Stacey Sueoka, Rich Summers, Alexandra Tritschler, Timothy Williams, Friedrich Wöger

Proceedings Volume 10700, 107000V (2018) https://doi.org/10.1117/12.2314212

KEYWORDS: Telescopes, Optical fabrication, Cameras, Mirrors, Control systems, Solar processes, Observatories, Polarimetry, Imaging systems, Polarization

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Construction of the Daniel K. Inouye Solar Telescope (DKIST) is well underway on the Haleakalā summit on the Hawaiian island of Maui. Featuring a 4-m aperture and an off-axis Gregorian configuration, the DKIST will be the world’s largest solar telescope. It is designed to make high-precision measurements of fundamental astrophysical processes and produce large amounts of spectropolarimetric and imaging data. These data will support research on solar magnetism and its influence on solar wind, flares, coronal mass ejections, and solar irradiance variability. Because of its large aperture, the DKIST will be able to sense the corona’s magnetic field—a goal that has previously eluded scientists—enabling observations that will provide answers about the heating of stellar coronae and the origins of space weather and exo-weather. The telescope will cover a broad wavelength range (0.35 to 28 microns) and operate as a coronagraph at infrared (IR) wavelengths. Achieving the diffraction limit of the 4-m aperture, even at visible wavelengths, is paramount to these science goals. The DKIST’s state-of-the-art adaptive optics systems will provide diffraction-limited imaging, resolving features that are approximately 20 km in size on the Sun.

At the start of operations, five instruments will be deployed: a visible broadband imager (VTF), a visible spectropolarimeter (ViSP), a visible tunable filter (VTF), a diffraction-limited near-IR spectropolarimeter (DLNIRSP), and a cryogenic near-IR spectropolarimeter (cryo-NIRSP). At the end of 2017, the project finished its fifth year of construction and eighth year overall. Major milestones included delivery of the commissioning blank, the completed primary mirror (M1), and its cell. Commissioning and testing of the coudé rotator is complete and the installation of the coudé cleanroom is underway; likewise, commissioning of the telescope mount assembly (TMA) has also begun. Various other systems and equipment are also being installed and tested. Finally, the observatory integration, testing, and commissioning (IT&C) activities have begun, including the first coating of the M1 commissioning blank and its integration within its cell assembly. Science mirror coating and initial on-sky activities are both anticipated in 2018.

Proceedings Article | 6 July 2018 Presentation + Paper

Development of DKIST IT&C Shack-Hartmann wavefront measurement system

Chen Liang, Predrag Sekulic, Kerry Gonzales, Pierre Aka, Simon Craig

Proceedings Volume 10700, 107001R (2018) https://doi.org/10.1117/12.2312832

KEYWORDS: Wavefronts, Calibration, Wavefront sensors, Optical design, Mirrors, Optical alignment, Solar telescopes, Telescopes

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Proceedings Article | 16 August 2016 Paper

Daniel K. Inouye Solar Telescope: integration, testing, and commissioning planning

Simon Craig, Kerry Gonzales, Robert Hubbard, Chen Liang, Ruth Kneale, William McBride, Predrag Sekulic, Timothy Williams

Proceedings Volume 9911, 991102 (2016) https://doi.org/10.1117/12.2233654

KEYWORDS: Solar telescopes, Systems engineering, Telescopes, Visualization, Astronomy, Geographic information systems, Coating, Optical alignment, Wavefronts, Systems modeling

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Proceedings Article | 4 August 2014 Paper

Daniel K. Inouye Solar Telescope: integration testing and commissioning planning

Simon Craig, Scott Bulau, Kerry Gonzales, Eric Hansen, Bret Goodrich, Robert Hubbard, Eric Johansson, Chen Liang, Ruth Kneale, William McBride, Predrag Sekulic, Timothy Williams

Proceedings Volume 9150, 91500C (2014) https://doi.org/10.1117/12.2056793

KEYWORDS: Mirrors, Optical alignment, Optical fabrication, Safety, Telescopes, Control systems, Coating, Wavefronts, Solar telescopes, Wavefront sensors

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Proceedings Article | 12 March 2014 Paper

Design and application of the snapshot hyperspectral imaging Fourier transform (SHIFT) spectropolarimeter for fluorescence imaging

Victoria Chan, Michael Kudenov, Chen Liang, Pixuan Zhou, Eustace Dereniak

Proceedings Volume 8949, 894903 (2014) https://doi.org/10.1117/12.2040501

KEYWORDS: Polarization, Spectroscopy, Wave plates, Calibration, Polarimetry, Interferometers, Fourier transforms, Linear polarizers, Hyperspectral imaging, Matrices

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Proceedings Article | 22 December 2003 Paper

Characterization of aspherical surface that has high numerical aperture by using a computer-generated hologram

Junwon Lee, Artur Olzak, Chen Liang, Michael Descour

Proceedings Volume 5180, (2003) https://doi.org/10.1117/12.506621

KEYWORDS: Computer generated holography, Diffraction, Interferometers, Micro optics, Optical spheres, Binary data, Wavefronts, Fringe analysis, Spherical lenses, Optical fabrication

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Proceedings Article | 23 December 2002 Paper

Miniature injection-molded optics for fiber optic in vivo confocal microscopy

Matthew Chidley, Chen Liang, Michael Descour, Kung-Bin Sung, Rebecca Richards-Kortum, Ann Gillenwater

Proceedings Volume 4832, (2002) https://doi.org/10.1117/12.486426

KEYWORDS: Objectives, Confocal microscopy, In vivo imaging, Optics manufacturing, Fiber optics, Algorithm development, Imaging systems, Endoscopy, Optical design, Tolerancing

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Proceedings Article | 16 October 2002 Paper

Stray-light analysis for multimodal miniature microscope

Junwon Lee, Jeremy Rogers, Chen Liang, Rebecca Richards-Kortum, Michael Descour

Proceedings Volume 4767, (2002) https://doi.org/10.1117/12.451324

KEYWORDS: Stray light, Stray light analysis, Sensors, Ray tracing, Imaging systems, Light sources, Microscopes, Reflectivity, Geometrical optics, Silicon

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Proceedings Article | 15 May 2001 Paper

Modeling of micro-optical systems by using nonsequential ray tracing

Sanna Aikio, Chen Liang, Jukka-Tapani Maekinen, Juha Rantala, Michael Descour

Proceedings Volume 4284, (2001) https://doi.org/10.1117/12.426863

KEYWORDS: Systems modeling, Ray tracing, Sensors, Waveguides, Chemical fiber sensors, Scattering, Light scattering, Silicon, Microscopes, Mirrors

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Proceedings Article | 15 May 2001 Paper

Miniaturized organic light-emitting diode (OLED) light source for micro-optical systems

Ari Kaerkkaeinen, Juha Rantala, Maurice Jabbour, Chen Liang, Robert Bedford, Nasser Peyghambarian, Michael Descour, Ghassan Jabbour

Proceedings Volume 4284, (2001) https://doi.org/10.1117/12.426861

KEYWORDS: Organic light emitting diodes, Light sources, Optical components, Photomasks, Chemical elements, Microscopes, Silicon, Electrodes, Glasses, Semiconducting wafers

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Showing 5 of 10 publications

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