Dr. Hangxin Ji Profile

Dr. Hangxin Ji

at NIAOT

SPIE Involvement:

Author

Publications (10)

Proceedings Article | 8 March 2023 Poster + Paper

Camera optics in the ultraviolet region of the Next Generation Palomar Spectrograph

Lifeng Tang, Zhongwen Hu, Hangxin Ji

Proceedings Volume 12428, 1242816 (2023) https://doi.org/10.1117/12.2657248

KEYWORDS: Cameras, Image quality, Liquid lenses, Spectrographs, Ultraviolet lenses, Optical design

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Proceedings Article | 29 August 2022 Presentation + Paper

Design and development of WFOS, the Wide-Field Optical Spectrograph for the Thirty Meter Telescope

Charles Steidel, Eric Peng, Jason Fucik, Reston Nash, Stephen Kaye, George Jacoby, Bernard Delabre, Ramya Sethuram, Devika Divakar, Hari Mohan Varshney, Thirupathi Sivarani, Fumihiro Uraguchi, Shinobu Ozaki, Hangxin Ji, Tao LV, Kent Chiu, Qinfeng Zhu, David Andersen, John Miles, Davide Lasi

Proceedings Volume 12184, 1218423 (2022) https://doi.org/10.1117/12.2629464

KEYWORDS: Cameras, Telescopes, Sensors, Diffraction gratings, Spectrographs, Thirty Meter Telescope, Imaging systems, Mirrors, Collimators, Optical instrument design

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Proceedings Article | 24 November 2021 Paper

Harmonic response and random vibration analysis of swing micro-mirror structure for gravitational wave observatory in space

Kunyao Zheng, Mingming Xu, Hong Zhang, Zhongwen Hu, Teng Xu, Hangxin Ji, Yi Chen

Proceedings Volume 12069, 1206905 (2021) https://doi.org/10.1117/12.2604294

KEYWORDS: Micromirrors, Mirrors, Observatories, Safety, Structural design

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Proceedings Article | 13 December 2020 Poster + Paper

The current status of the imaging and spectrogragh (IMSP) for 4m telescope

Hangxin Ji, Yi Chen, Lei Wang, Songxin Dai, Huatao Zhang, Zhen Tang, Jun Li, Qiqige Xin, Yongtian Zhu, Zhongwen Hu

Proceedings Volume 11447, 114475O (2020) https://doi.org/10.1117/12.2560129

KEYWORDS: Spectrographs, Imaging systems, Telescopes, Near infrared, Physics, Spectral resolution, Image resolution, Channel projecting optics, Mirrors, Charge-coupled devices

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Proceedings Article | 9 July 2018 Presentation

The wide field optical spectrograph (WFOS) for TMT: fiber-WFOS optical design (Conference Presentation)

Renate Kupke, Hangxin Ji, Sriram Padmanaban Nadar, Devika Divakar, Luc Gilles

Proceedings Volume 10702, 1070221 (2018) https://doi.org/10.1117/12.2313674

KEYWORDS: Spectrographs, Optical design, Spectral resolution, Channel projecting optics, Astronomical imaging, Optical fibers, Collimators, Cameras, Multiplexing, Adaptive optics

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Proceedings Article | 9 July 2018 Presentation

WFOS instrument trade study: slicer vs. fiber instrument concept designs and results (Conference Presentation)

Kevin Bundy, Maureen Savage, Renate Kupke, Nicholas MacDonald, Kyle Westfall, Matthew Radovan, Zheng Cai, Brian Digiorgio, Richard Dekany, Devika Divakar, Jason Fucik, Hangxin Ji, Satoshi Miyazaki, Shinobu Ozaki, Andrew Phillips, Namrata Roy, Roger Smith, Arun Surya, S. Sriram, Sivarani Thirupathi, Toshihiro Tsuzuki

Proceedings Volume 10702, 1070220 (2018) https://doi.org/10.1117/12.2312283

KEYWORDS: Spectrographs, Thirty Meter Telescope, Multiplexing, Robotic systems, Spectroscopy, Astronomical imaging, Robotics, Fiber couplers, Telescopes

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Proceedings Article | 6 July 2018 Presentation + Paper

The LAMOST middle resolution spectrograph

Yonghui Hou, Linlin Tang, Mingming Xu, Haijiao Jiang, Zhongwen Hu, Lei Wang, Hangxin Ji, Yongtian Zhu

Proceedings Volume 10702, 107021I (2018) https://doi.org/10.1117/12.2312279

KEYWORDS: Spectrographs, Spectroscopy, Cameras, Imaging systems, Astronomical imaging, Spectroscopes, Telescopes, CCD cameras, Spectral resolution

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Proceedings Article | 6 July 2018 Paper

Optical design of imaging and spectrograph for 4m telescope in China

Hangxin Ji, Yongtian Zhu, Zhongwen Hu, Yi Chen, Lei Wang, Mingming Xu, Songxin Dai, Huatao Zhang

Proceedings Volume 10702, 1070224 (2018) https://doi.org/10.1117/12.2309911

KEYWORDS: Spectrographs, Cameras, Imaging systems, Mirrors, Sensors, Telescopes, Optical design, Spectral resolution, Near infrared, Charge-coupled devices

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Proceedings Article | 15 October 2015 Paper

The optimization of collimator's light-weighting structure based on MOBIE system of TMT

Hong Chen, Yi Chen, Zhongwen Hu, Mingming Xu, Hangxin Ji, Lei Wang

Proceedings Volume 9672, 967207 (2015) https://doi.org/10.1117/12.2199774

KEYWORDS: Collimators, Mirrors, Silicon carbide, Telescopes, Photovoltaics, Astronomical imaging, Cameras, Zerodur, Optomechanical design, Reflector telescopes

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Proceedings Article | 28 July 2014 Paper

Study on a multi-delay spectral interferometry for stellar radial velocity measurement

Kai Zhang, Haijiao Jiang, Jin Tang, Hangxin Ji, Yongtian Zhu, Liang Wang

Proceedings Volume 9147, 914757 (2014) https://doi.org/10.1117/12.2055562

KEYWORDS: Interferometry, Interferometers, Spectrographs, Velocity measurements, Calibration, Doppler effect, Astronomy, Telescopes, Astronomical imaging, Optical interferometry

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High accuracy radial velocity measurement isn’t only one of the most important methods for detecting earth-like Exoplanets, but also one of the main developing fields of astronomical observation technologies in future. Externally dispersed interferometry (EDI) generates a kind of particular interference spectrum through combining a fixed-delay interferometer with a medium-resolution spectrograph. It effectively enhances radial velocity measuring accuracy by several times. Another further study on multi-delay interferometry was gradually developed after observation success with only a fixed-delay, and its relative instrumentation makes more impressive performance in near Infrared band. Multi-delay is capable of giving wider coverage from low to high frequency in Fourier field so that gives a higher accuracy in radial velocity measurement. To study on this new technology and verify its feasibility at Guo Shoujing telescope (LAMOST), an experimental instrumentation with single fixed-delay named MESSI has been built and tested at our lab. Another experimental study on multi-delay spectral interferometry given here is being done as well. Basically, this multi-delay experimental system is designed in according to the similar instrument named TEDI at Palomar observatory and the preliminary test result of MESSI. Due to existence of LAMOST spectrograph at lab, a multi-delay interferometer design actually dominates our work. It’s generally composed of three parts, respectively science optics, phase-stabilizing optics and delay-calibrating optics. To switch different fixed delays smoothly during observation, the delay-calibrating optics is possibly useful to get high repeatability during switching motion through polychromatic interferometry. Although this metrology is based on white light interferometry in theory, it’s different that integrates all of interference signals independently obtained by different monochromatic light in order to avoid dispersion error caused by broad band in big optical path difference (OPD).

Showing 5 of 10 publications

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