Dr. Wenda Cao Profile

Dr. Wenda Cao

at Big Bear Solar Observatory

SPIE Involvement:

Author

Publications (22)

Proceedings Article | 29 August 2022 Poster + Paper

Supporting Parker Solar Probe mission with Goode Solar Telescope at Big Bear Solar Observatory

Wenda Cao, Vasyl Yurchyshyn, Xu Yang, Kyung-Suk Cho, Haimin Wang

Proceedings Volume 12184, 1218428 (2022) https://doi.org/10.1117/12.2628741

KEYWORDS: Solar processes, Magnetism, Imaging spectroscopy, Data processing, Solar telescopes, Adaptive optics, Speckle, Data acquisition, Observatories, High angular resolution imaging

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Proceedings Article | 13 December 2020 Poster + Presentation + Paper

CYRA: the cryogenic infrared spectrograph for the Goode Solar Telescope in Big Bear

Xu Yang, Wenda Cao, Nicolas Gorceix, Claude Plymate, Sergey Shumoko, XianYong Bai, Matt Penn, Thomas Ayres, Roy Coulter, Philip Goode

Proceedings Volume 11447, 11447AG (2020) https://doi.org/10.1117/12.2562474

KEYWORDS: Infrared telescopes, Spectrographs, Cryogenics, Solar telescopes, Infrared spectroscopy, Infrared radiation, Solar processes, Observatories, Magnetism, Sensors

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CYRA (CrYogenic solar spectrogRAph) is a facility instrument of the 1.6-meter Goode Solar Telescope (GST) at the Big Bear Solar Observatory (BBSO). CYRA focuses on the study of the near-infrared solar spectrum between 1 and 5 microns, an under-explored region which is not only fertile ground for photospheric magnetic diagnostics but also allows a unique window into the chromosphere lying atop the photosphere. CYRA is the first-ever fully cryogenic spectrograph in any solar observatory with its two predecessors, on the McMath-Pierce and Mees Telescopes, being based on warm optics except for the detectors and order sorting filters. CYRA is used to probe magnetic fields in various solar features and the quiet photosphere. CYRA measurements will allow new and better 3D extrapolations of the solar magnetic field and will provide more accurate boundary conditions for solar activity models. The superior spectral resolution of 150,000 and better allows enhanced observations of the chromosphere in the carbon monoxide (CO) spectral bands and will yield a better understanding of energy transport in the solar atmosphere. CYRA is divided into two optical sub-systems: The Fore-Optics Module and the Spectrograph. The Spectrograph is the heart of the instrument and contains the IR detector, grating, slits, filters, and imaging optics all in a cryogenically cooled Dewar (cryostat). The sensor is a 2048 by 2048 pixel HAWAII 2 array produced by Teledyne Scientific and Imaging, LLC. The cryostat interior and the readout electronics are maintained at 90 Kelvin by helium refrigerant-based cryo-coolers, while the IR array is cooled to 30 Kelvin. The Fore-Optics Module de-rotates and stabilizes the solar image, provides scanning capabilities and transfers the GST image to the Spectrograph. CYRA has been installed and is undergoing its commissioning phase. This paper reports on the design, implementation, and operation of CYRA in detail. The preliminary scientific results have been highlighted as well.

Proceedings Article | 7 August 2014 Paper

AO-308: the high-order adaptive optics system at Big Bear Solar Observatory

Sergey Shumko, Nicolas Gorceix, Seonghwan Choi, Aglaé Kellerer, Wenda Cao, Philip Goode, Volodymyr Abramenko, Kit Richards, Thomas Rimmele, Jose Marino

Proceedings Volume 9148, 914835 (2014) https://doi.org/10.1117/12.2056731

KEYWORDS: Digital signal processing, Adaptive optics, Cameras, Mirrors, Wavefronts, Signal processing, Observatories, Image processing, Actuators, Telescopes

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Proceedings Article | 28 July 2014 Paper

Control and operation of the 1.6 m New Solar Telescope in Big Bear

J. Varsik, C. Plymate, P. Goode, A. Kosovichev, W. Cao, R. Coulter, K. Ahn, N. Gorceix, S. Shumko

Proceedings Volume 9147, 91475D (2014) https://doi.org/10.1117/12.2056688

KEYWORDS: Adaptive optics, Telescopes, Imaging systems, Mirrors, Control systems, Electroluminescent displays, Solar telescopes, Cameras, Visible radiation, Infrared imaging

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Proceedings Article | 21 July 2014 Paper

Optical design of the Big Bear Solar Observatory's multi-conjugate adaptive optics system

Xianyu Zhang, Nicolas Gorceix, Dirk Schmidt, Philip Goode, Wenda Cao, Thomas Rimmele, Roy Coulter

Proceedings Volume 9148, 914850 (2014) https://doi.org/10.1117/12.2055561

KEYWORDS: Mirrors, Wavefront sensors, Adaptive optics, Optical design, Solar telescopes, Observatories, Electroluminescent displays, Light sources, Telescopes, Modulation transfer functions

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Proceedings Article | 17 September 2012 Paper

The 1.6 m off-axis New Solar Telescope (NST) in Big Bear

Philip Goode, Wenda Cao

Proceedings Volume 8444, 844403 (2012) https://doi.org/10.1117/12.925494

KEYWORDS: Adaptive optics, Telescopes, Solar telescopes, Diffraction, Visible radiation, Near infrared, Digital signal processing, Magnetism, Spatial resolution, Polarimetry

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Proceedings Article | 6 August 2010 Paper

First light of the 1.6 meter off-axis New Solar Telescope at Big Bear Solar Observatory

Wenda Cao, Nicolas Gorceix, Roy Coulter, Aaron Coulter, Philip Goode

Proceedings Volume 7733, 773330 (2010) https://doi.org/10.1117/12.856611

KEYWORDS: Phase modulation, Mirrors, Telescopes, Solar telescopes, Observatories, Space telescopes, Optical alignment, Reflectors, Monochromatic aberrations, Off axis mirrors

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Proceedings Article | 21 July 2010 Paper

Nasmyth focus instrumentation of the New Solar Telescope at Big Bear Solar Observatory

Wenda Cao, Nicolas Gorceix, Roy Coulter, Friedrich Wöger, Kwangsu Ahn, Sergiy Shumko, John Varsik, Aaron Coulter, Philip Goode

Proceedings Volume 7735, 77355V (2010) https://doi.org/10.1117/12.856613

KEYWORDS: Telescopes, Speckle, Solar telescopes, Space telescopes, Diffraction, Computed tomography, Observatories, Spatial resolution, Mirrors, Cameras

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Proceedings Article | 20 July 2010 Paper

Repackaging and characterizing of a HgCdTe CMOS infrared camera for the New Solar Telescope

Wenda Cao, Roy Coulter, Nicolas Gorceix, Philip Goode

Proceedings Volume 7742, 774220 (2010) https://doi.org/10.1117/12.856616

KEYWORDS: Cameras, Staring arrays, Infrared cameras, Optical filters, Solar telescopes, Infrared imaging, Mercury cadmium telluride, Infrared radiation, Near infrared, Electronics

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Proceedings Article | 23 June 2006 Paper

Progress on the 1.6-meter New Solar Telescope at Big Bear Solar Observatory

C. Denker, P. Goode, D. Ren, M. Saadeghvaziri, A. Verdoni, H. Wang, G. Yang, V. Abramenko, W. Cao, R. Coulter, R. Fear, J. Nenow, S. Shoumko, T. Spirock, J. Varsik, J. Chae, J. Kuhn, Y. Moon, Y. Park, A. Tritschler

Proceedings Volume 6267, 62670A (2006) https://doi.org/10.1117/12.671870

KEYWORDS: Telescopes, Mirrors, Space telescopes, Observatories, Adaptive optics, Solar telescopes, Domes, Control systems, Astronomy, Wavefront sensors

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Proceedings Article | 12 September 2005 Paper

1024 × 1024 HgCdTe CMOS camera for infrared imaging magnetograph of Big Bear Solar Observatory

W. Cao, Y. Xu, C. Denker, H. Wang

Proceedings Volume 5881, 58810X (2005) https://doi.org/10.1117/12.637484

KEYWORDS: Cameras, Infrared imaging, Near infrared, Observatories, Imaging systems, CMOS cameras, Mercury cadmium telluride, Infrared radiation, Sensors, Temperature metrology

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Proceedings Article | 18 August 2005 Paper

Near-infrared HeI 1083nm Stokes polarimeter based on liquid crystal variable retarders

Zhiyong Zhang, Yuanyong Deng, Dongguang Wong, Yingzi Sun, Wenda Cao

Proceedings Volume 5901, 59011F (2005) https://doi.org/10.1117/12.615661

KEYWORDS: Polarimetry, Prisms, Calibration, Liquid crystals, Crystals, Wave plates, Magnetism, Modulation, Polarization, Beam splitters

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Proceedings Article | 14 October 2004 Paper

Near infrared (NIR) achromatic phase retarder

Jun Ma, Jingshan Wang, W. Cao, Carsten Denker, Haimin Wang

Proceedings Volume 5523, (2004) https://doi.org/10.1117/12.557652

KEYWORDS: Wave plates, Calcite, Optical filtering, Crystals, Near infrared, Polarizers, Liquid crystals, Polarization, Linear polarizers, Quartz

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Proceedings Article | 30 September 2004 Paper

Near infrared waveplate

Dongguang Wang, Yuanyong Deng, Wenda Cao

Proceedings Volume 5492, (2004) https://doi.org/10.1117/12.553165

KEYWORDS: Wave plates, Infrared radiation, Near infrared, Polarimetry, Infrared telescopes, Crystals, Solar processes, Transmittance, Observatories, Polymers

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Proceedings Article | 4 February 2004 Paper

Characteristic evaluation of a near-infrared Fabry-Pérot filter for the InfraRed Imaging Magnetograph (IRIM)

Wenda Cao, Carsten Denker, Haimin Wang, J. Ma, M. Qu, Jinshan Wang, Philip Goode

Proceedings Volume 5171, (2004) https://doi.org/10.1117/12.506429

KEYWORDS: Fabry–Perot interferometers, Near infrared, Optical filters, Magnetism, Reflectivity, Coating, Image filtering, Infrared imaging, Observatories, Absorption

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Proceedings Article | 17 January 2002 Paper

Stokes polarimetry at near-infrared 1.56 um for solar observation

Wenda Cao, Binxun Ye, Dongguang Wang, Qian Song

Proceedings Volume 4480, (2002) https://doi.org/10.1117/12.453338

KEYWORDS: Polarimetry, Magnetism, Near infrared, Infrared radiation, Spectrographs, Telescopes, Solar processes, Free electron lasers, Optical components, Infrared search and track

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Proceedings Article | 10 December 2001 Paper

Design concepts of EUV telescopes and the detectors boarded on the Solar Space Telescope

Qian Song, Binxun Ye, Jianlin Cao, Bo Chen, Wenda Cao

Proceedings Volume 4498, (2001) https://doi.org/10.1117/12.450067

KEYWORDS: Space telescopes, Telescopes, Solar processes, Extreme ultraviolet, Sensors, Coronagraphy, Image intensifiers, Spatial resolution, Optical instrument design, X-rays

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Proceedings Article | 15 December 2000 Paper

PtSi IRFPA camera and its application in infrared solar spectrum observation

Wenda Cao, Binxun Ye, J. He

Proceedings Volume 4130, (2000) https://doi.org/10.1117/12.409833

KEYWORDS: Infrared radiation, Mirrors, Spectrographs, Cameras, Observatories, Quantum efficiency, Sensors, Infrared cameras, Imaging systems, Mercury cadmium telluride

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Proceedings Article | 16 August 2000 Paper

PtSi IRFPA camera and its application in infrared solar spectrum observation

Wenda Cao, Binxun Ye, Qian Song, J. He, X. Zhou, Kaifan Ji

Proceedings Volume 4008, (2000) https://doi.org/10.1117/12.395539

KEYWORDS: Infrared radiation, Spectrographs, Cameras, Observatories, Sensors, Mirrors, Quantum efficiency, Infrared cameras, Iron, Imaging systems

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Proceedings Article | 2 June 2000 Paper

Simultaneous remote observation from six sites organized at the 1-m telescope of the Yunnan Observatory

Wenda Cao, Qian Song, Kaifan Ji

Proceedings Volume 4011, (2000) https://doi.org/10.1117/12.387219

KEYWORDS: Observatories, Telescopes, Internet, Image compression, Astronomy, Astronomical telescopes, Charge-coupled devices, Image acquisition, Binary data, Control systems

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Proceedings Article | 11 August 1998 Paper

Easy way to evaluate CCDs for astronomical use

Qian Song, Kaifan Ji, Wenda Cao

Proceedings Volume 3553, (1998) https://doi.org/10.1117/12.318087

KEYWORDS: Charge-coupled devices, Quantum efficiency, Interference (communication), Electrons, Astronomy, Observatories, Light sources, Calibration, CCD cameras, Photons

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Proceedings Article | 26 May 1998 Paper

Two remote-presence observations at the 1-m telescope of the Yunnan Observatory in China

Kaifan Ji, Wenda Cao, Binxun Ye, Qian Song, Y. Chu, K. Chen, June Sun, Y. Sun

Proceedings Volume 3351, (1998) https://doi.org/10.1117/12.308813

KEYWORDS: Observatories, Telescopes, Image compression, Internet, Astronomy, Astronomical telescopes, Charge-coupled devices, Image acquisition, Binary data, Control systems

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Showing 5 of 22 publications

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