Dr. Hao-Tong Zhang Profile

Dr. Hao-Tong Zhang

at National Astronomical Observatories CAS

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Publications (7)

SPIE Journal Paper | 5 December 2023

Evaluation method to obtain a fiducial fiber metrology benchmark for the Large Sky Area Multi-Object Fiber Spectroscopic Telescope

Ziming Liu, Congcong Du, Yingfu Wang, Shipeng Duan, Zhigang Liu, Hongzhuan Hu, Jianping Wang, Jiaru Chu, Xiangqun Cui, Yong Zhang, Haotong Zhang, Zengxiang Zhou

JATIS, Vol. 9, Issue 04, 044002, (December 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.4.044002

KEYWORDS: Calibration, Cameras, Imaging systems, Visualization, Metrology, Laser soldering, Photography, Telescopes, Camera calibration, Fiber lasers

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Realizing accurate positioning with the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) closed-loop system depends on accurate high-precision calibration of the visual measurement system, which has a great impact on collision avoidance and accurate positioning. We designed fiducial fibers for the calibration of the LAMOST closed-loop system to provide accurate fiducial positions for visual measurement. The benchmark position accuracy of the fiducial fibers is a key factor affecting the accuracy of the visual measurement system; the more accurate the fiducial fiber positions are, the higher the visual measurement correction accuracy. In this study, three measurement methods were used to obtain the fiducial fiber positions, namely, measuring the hole positions using a coordinate measuring machine, imaging the fiducial fibers using a calibrated photographic system, and directly measuring the fiducial fiber spatial positions using a laser tracker. By evaluating the fiber positions obtained via the three methods, we can obtain a stable and reliable fiducial fiber position benchmark. A fiducial fiber positions evaluation method based on an optimal residual criterion is proposed, and the optimal residual solution for a small calibration target (SCT) is used to evaluate the optimal fiducial fiber measurement method. Specifically, the fiducial positions obtained via each of the three methods are used to invert the camera calibration parameters, which are then used to calculate the physical position of an SCT. Finally, the residual value between the calculated and theoretical positions is taken as the standard for evaluating the fiducial fiber measurement benchmark performance. The results show that the fiducial fiber positions measured using the laser tracker can be applied to effectively calibrate the photographic system, enabling the LAMOST vision measurement system to achieve a positioning accuracy of nearly 10 μm with the camera 20 m from the focal surface, whereas the accuracy is within 20 μm for ∼95 % of the measurement points.

Proceedings Article | 24 September 2012 Paper

Final redshift determination of LAMOST pilot survey

Fengfei Wang, A-Li Luo, Haotong Zhang

Proceedings Volume 8451, 84512Z (2012) https://doi.org/10.1117/12.925117

KEYWORDS: Galactic astronomy, Stars, Calibration, Astronomy, Telescopes, Observatories, Spectrographs, Astronomical telescopes, Active optics, Spectral calibration

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Proceedings Article | 13 September 2012 Paper

The plate candidates and tiling method for LAMOST pilot survey

Hailong Yuan, Haotong Zhang, Yajuan Lei, Yiqiao Dong

Proceedings Volume 8448, 84482A (2012) https://doi.org/10.1117/12.925359

KEYWORDS: Stars, Charge-coupled devices, Telescopes, Wavefronts, Optical fibers, Astronomy, Observatories, Wavefront sensors, Astronomical imaging, Spectroscopes

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Proceedings Article | 16 July 2008 Paper

An adaptive algorithm based on RBF for extracting the flux of fiber spectrum

Hanqin Qin, Zhongfu Ye, A-li Luo, Haotong Zhang

Proceedings Volume 7019, 701934 (2008) https://doi.org/10.1117/12.788159

KEYWORDS: Neural networks, Charge-coupled devices, CCD image sensors, Telescopes, Astronomical imaging, Evolutionary algorithms, Signal to noise ratio, Astronomy, Spectroscopy, Computer simulations

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Proceedings Article | 14 July 2008 Paper

Design and realization of survey strategy system

Hai-Long Yuan, Jian Ren, Jian Wang, Ge Jin, Hao-Tong Zhang

Proceedings Volume 7016, 70161E (2008) https://doi.org/10.1117/12.788266

KEYWORDS: Telescopes, Optical fibers, Stars, Astronomical imaging, Detection and tracking algorithms, Astronomical telescopes, Astronomy, Databases, Device simulation, Algorithm development

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Proceedings Article | 11 July 2008 Paper

Flat field for LAMOST

Haotong Zhang, Zhongrui Bai

Proceedings Volume 7014, 701443 (2008) https://doi.org/10.1117/12.787394

KEYWORDS: Telescopes, Lamps, Reflectivity, Reflector telescopes, Calibration, Vignetting, Spectrographs, Light sources, Spectroscopy, Projection systems

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Proceedings Article | 28 September 2004 Paper

Atmospheric refraction effect and its correction in LAMOST

Haotong Zhang, Yongheng Zhao, Huoming Shi

Proceedings Volume 5489, (2004) https://doi.org/10.1117/12.550852

KEYWORDS: Refraction, Telescopes, Monte Carlo methods, Image filtering, Atmospheric corrections, Observatories, Galactic astronomy, Spectroscopy, Computer simulations, Tolerancing

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Showing 5 of 7 publications

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