Prof. Hongzhuan Hu Profile

Prof. Hongzhuan Hu

Associate Professor at Univ of Science and Technology of China

SPIE Involvement:

Author

Publications (34)

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 | 19 October 2023 Paper

Research on fault diagnosis of LAMOST fiber positioning robot

Zengxiang Zhou, Yihu Tang, Yingfu Wang, Shipeng Duan, Jiadong Liang, Zeyu Cai, Zhigang Liu, Hu Hongzhuan, Jianping Wang

Proceedings Volume 12709, 127095Z (2023) https://doi.org/10.1117/12.2684537

KEYWORDS: Error analysis, Diagnostics, Spectroscopy, Failure analysis, Cameras, Structured optical fibers

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SPIE Journal Paper | 16 March 2021

Multitarget fiber high-precision position detection method based on a front light source

Zengxiang Zhou, Shipeng Duan, Jiale Zuo, Mengtao Li, Zhigang Liu, Hongzhuan Hu, Jianping Wang, Jiaru Chu

JATIS, Vol. 7, Issue 01, 014007, (March 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.1.014007

KEYWORDS: Light sources, Image processing, Back illuminated sensors, Image segmentation, Hough transforms, Target detection, Spectroscopy, Interferometers, Telescopes, Detection and tracking algorithms

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Proceedings Article | 13 December 2020 Poster + Paper

Analysis of LAMOST optical fiber positioning units closed-loop operation by dual-telecentric measurement system

Zengxiang Zhou, Zhigang Liu, Jianping Wang, Hongzhuan Hu, Jiaru Chu, Shipeng Duan, Jiale Zuo, Mengtao Li

Proceedings Volume 11445, 114456F (2020) https://doi.org/10.1117/12.2561446

KEYWORDS: Calibration, Imaging systems, Optical fibers, Distortion, Telescopes, Metrology

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Proceedings Article | 13 December 2020 Poster + Paper

A new metrology method for optical fiber position detection

Zengxiang Zhou, Zhigang Liu, Jianping Wang, Hongzhuan Hu, Jiaru Chu, Mengtao Li, Shipeng Duan, Jiale Zuo

Proceedings Volume 11445, 1144547 (2020) https://doi.org/10.1117/12.2561056

KEYWORDS: Optical fibers, Metrology, Ceramics, Head, Target detection, Control systems, CMOS cameras, Light sources, Light sources and illumination, Image processing

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Proceedings Article | 13 December 2020 Paper

Equalization and hole location modeling for large scale non-planar focal plane

Jianping Wang, Shengliang Gu, Feifan Zhang, Hongzhuan Hu, Zengxiang Zhou

Proceedings Volume 11451, 114516M (2020) https://doi.org/10.1117/12.2561303

KEYWORDS: Error analysis, Data modeling, Zoom lenses, Data centers, MATLAB, 3D modeling

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Proceedings Article | 13 December 2020 Poster + Paper

Research on reference fiber for closed-loop measurement of Spectral Survey Telescope

Shipeng Duan, Zhigang Liu, Jianping Wang, Hongzhuan Hu, Mengtao Li, Zengxiang Zhou, Jiale Zuo, Jiaru Chu

Proceedings Volume 11445, 114456B (2020) https://doi.org/10.1117/12.2560310

KEYWORDS: Cameras, Telescopes, Optical fibers, Spectroscopy, Calibration, Back illuminated sensors, Photography, Imaging systems, CCD cameras, Visualization

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Proceedings Article | 10 July 2018 Paper

Structural error simulation analysis of LAMOST fiber units

Yonggang Gu, Xinyu Feng, Yuran Shen, Hongzhuan Hu, Chao Zhai

Proceedings Volume 10702, 1070282 (2018) https://doi.org/10.1117/12.2313119

KEYWORDS: Optical fibers, Error analysis, Structured optical fibers, 3D modeling, Analytical research, Optical simulations, Motion models, Prototyping, Reflector telescopes, Telescopes

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Proceedings Article | 10 July 2018 Paper

Photogrammetry-based metrology of fiber positioner in LAMOST

Lianpo Wang, Yonggang Gu, Ye Zhu, Chao Zhai, Hongzhuan Hu, Zhigang Liu

Proceedings Volume 10706, 107064D (2018) https://doi.org/10.1117/12.2311948

KEYWORDS: Calibration, Cameras, Optical fibers, Distortion, 3D modeling, Metrology, Mathematical modeling, Photogrammetry, Spherical lenses, Telescopes

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Proceedings Article | 10 July 2018 Paper

A micro-optical fiber positioner

Hongzhuan Hu, Jianping Wang, Zhigang Liu, Zengqiang Zhou, Chao Zhai, Jiaru Chu

Proceedings Volume 10706, 107065U (2018) https://doi.org/10.1117/12.2309890

KEYWORDS: Optical fibers, Servomechanisms, Spectroscopy, Roads, Telescopes, Galactic astronomy, Optical design, Astronomy, Chaos, Optical mounts

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This paper gives a scheme of optical fiber positioner structure of a miniature, by use of the DC servo motor with the diameter of 3mm driver, the distance can designed to 8.5mm, and can arrange more than 12000 fibers in the focal plane with the diameter of 1 meters, it is especially suitable for telescope with small dimension focal plane and has high density fiber positioning requirements. Based on the principle of double rotary fiber positioning principle, It consists of a hollow shaft revolving mechanism, and eccentric axis revolving mechanism relative to hollow shaft. The hollow shaft turns round at the range of -180 degrees to +180 degrees and the eccentric axis turns round at the range of -90 degrees to +90 degrees at the half of radius driving by each control motor. When positioning, the optical fiber end moves on the focal plate throughout, and can never deviate from focal plane. optical fiber is fixed in the mounting hole of fiber support which installed on the eccentric rotary shaft (fiber support’s hole axis is parallel to the axis of the hollow shaft), and fiber will lead to pass through the inner hole of the hollow shaft and focal plate then connected to the spectrometer. positioner center shaft adopts planetary gear driving principle, with small module motor’s gear and the fixed ring gear can driving motor and positioner planetary rotate, the eccentric shaft by DC servo motor with the diameter of 3mm drived coaxial optical fiber on the eccentric shaft, the center and the eccentric shafts adopts micro rolling bearing support; in order to prevent the positioner’s center and eccentric shaft to rotate out of bounds, both limiting devices have designed to ensure the safety of fiber positioning; both center and eccentric shaft are designed with a spring structure to eliminate the influence of gear clearance; because positioner size is very small, the positioner driving wire is embedded in the slot of the hollow shaft sleeve wall. This will not affect the fiber go through the center shaft’s holes and pass through the focal plane; positioner sample test results show that the closed-loop positioning can reached accuracy of 0.01mm unit, and can meet with the demand of optical fiber positioning.

Proceedings Article | 10 July 2018 Paper

Dynamic position accuracy analysis of fiber positioner

Yonggang Gu, Feng Cheng, Chao Zhai, Hongzhuan Hu

Proceedings Volume 10706, 1070667 (2018) https://doi.org/10.1117/12.2311859

KEYWORDS: Monte Carlo methods, Error analysis, 3D modeling, Analytical research, Tolerancing, Optical fibers

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Proceedings Article | 9 July 2018 Paper

Stability study of the multi-object photogrammetric platform for optical fiber units

Houxi He, Jiaru Chu, Zengxiang Zhou, Hongzhuan Hu, Jianping Wang, Zhigang Liu

Proceedings Volume 10702, 107027F (2018) https://doi.org/10.1117/12.2311789

KEYWORDS: Vibration isolation, Magnetism, Head, Cameras, Optical fibers, Control systems design, Prototyping, Metrology, Control systems, Imaging systems

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Proceedings Article | 9 July 2018 Paper

The improvement of LAMOST fiber view camera metrology system fiber position recognition algorithm

Zengxiang Zhou, Jianping Wang, Hongzhuan Hu, Zhigang Liu, Kang Zhao, Chao Zhai

Proceedings Volume 10702, 1070277 (2018) https://doi.org/10.1117/12.2309750

KEYWORDS: Optical fibers, Cameras, Imaging systems, CCD cameras, Stereo vision systems, Detection and tracking algorithms, Metrology

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Proceedings Article | 6 July 2018 Paper

The fiber view metrology system design for spectral survey telescope

Zengxiang Zhou, Jianping Wang, Hongzhuan Hu, Zhigang Liu, Kang Zhao, Chao Zhai

Proceedings Volume 10700, 107002A (2018) https://doi.org/10.1117/12.2307301

KEYWORDS: Telescopes, Cameras, Optical fibers, Imaging systems, CMOS cameras, Optical instrument design, Servomechanisms, Image processing, Visualization, Calibration

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Proceedings Article | 22 July 2016 Paper

Research and implementation of the integrated cooling system for focal plate

Jianping Wang, Hongzhuan Hu, Zengxiang Zhou, Jiaru Chu, Lixuan Cheng

Proceedings Volume 9912, 99124Y (2016) https://doi.org/10.1117/12.2231876

KEYWORDS: Cooling systems, Space telescopes, Telescopes, Composites, Convection, Temperature metrology, Power supplies, 3D modeling, Finite element methods, Control systems

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Proceedings Article | 22 July 2016 Paper

Back-illuminate fiber system research for multi-object fiber spectroscopic telescope

Zengxiang Zhou, Jianping Wang, Hongzhuan Hu, Jiaru Chu, Zhigang Liu, Chao Zhai

Proceedings Volume 9912, 991258 (2016) https://doi.org/10.1117/12.2231975

KEYWORDS: Back illuminated sensors, Telescopes, Spectroscopy, CCD cameras, Spectrographs, Light emitting diodes, Optical fibers, Light sources, Light sources and illumination, Integrating spheres

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In the telescope observation, the position of fiber will highly influence the spectra efficient input in the fiber to the spectrograph. When the fibers were back illuminated on the spectra end, they would export light on the positioner end, so the CCD cameras could capture the photo of fiber tip position covered the focal plane, calculates the precise position information by light centroid method and feeds back to control system. A set of fiber back illuminated system was developed which combined to the low revolution spectro instruments in LAMOST. It could provide uniform light output to the fibers, meet the requirements for the CCD camera measurement. The paper was introduced the back illuminated system design and different test for the light resource. After optimization, the effect illuminated system could compare with the integrating sphere, meet the conditions of fiber position measurement.Using parallel controlled fiber positioner as the spectroscopic receiver is an efficiency observation system for spectra survey, has been used in LAMOST recently, and will be proposed in CFHT and rebuilt telescope Mayall. In the telescope observation, the position of fiber will highly influence the spectra efficient input in the fiber to the spectrograph. When the fibers were back illuminated on the spectra end, they would export light on the positioner end, so the CCD cameras could capture the photo of fiber tip position covered the focal plane, calculates the precise position information by light centroid method and feeds back to control system. After many years on these research, the back illuminated fiber measurement was the best method to acquire the precision position of fibers. In LAMOST, a set of fiber back illuminated system was developed which combined to the low revolution spectro instruments in LAMOST. It could provide uniform light output to the fibers, meet the requirements for the CCD camera measurement and was controlled by high-level observation system which could shut down during the telescope observation. The paper was introduced the back illuminated system design and different test for the light resource. After optimization, the effect illuminated system could compare the integrating sphere, meet the conditions of fiber position measurement.

Proceedings Article | 22 July 2016 Paper

A compact optical fiber positioner

Hongzhuan Hu, Zhigang Liu, Zengxiang Zhou, Chao Zhai, Jiaru Chu, Jianping Wang

Proceedings Volume 9912, 991259 (2016) https://doi.org/10.1117/12.2231864

KEYWORDS: Optical fibers, Safety, Structured optical fibers, Telescopes, Galactic astronomy, Control systems, Optical design, Astronomy, Stars, Spectroscopy

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Proceedings Article | 19 August 2014 Paper

Research of fiber position measurement by multi CCD cameras

Zengxiang Zhou, Zhigang Liu, Jianping Wang, Hongzhuan Hu, Chao Zhai, Jiaru Chu

Proceedings Volume 9151, 91514X (2014) https://doi.org/10.1117/12.2055657

KEYWORDS: CCD cameras, Cameras, Telescopes, Prototyping, MATLAB, Imaging systems, Robotics, Control systems, Image processing, Optical fibers

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Proceedings Article | 28 July 2014 Paper

Accuracy research for survey telescope fiber position measurement

Zengxiang Zhou, Zhigang Liu, Hongzhuan Hu, Jianping Wang, Chao Zhai, Jiaru Chu

Proceedings Volume 9147, 91476M (2014) https://doi.org/10.1117/12.2055301

KEYWORDS: Telescopes, Cameras, 3D metrology, Photogrammetry, Galactic astronomy, Photography, 3D modeling, Robotics, Stars, Target detection

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Proceedings Article | 18 July 2014 Paper

Mechanical design and analysis of focal plate for gravity deformation

Jianping Wang, Jiaru Chu, Hongzhuan Hu, Kexuan Li, Zengxiang Zhou

Proceedings Volume 9151, 915134 (2014) https://doi.org/10.1117/12.2055619

KEYWORDS: Space telescopes, MATLAB, Telescopes, Mechanical engineering, Astronomical telescopes, Aluminum, Astronomy, Optical fibers, Aerospace engineering, Mathematical modeling

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Proceedings Article | 18 July 2014 Paper

A high-density integrated optical focal plane positioning system

Hongzhuan Hu, Jianping Wang, Zhigang Liu, Zengxiang Zhou, Chao Zhai, Jiaru Chu

Proceedings Volume 9151, 91514R (2014) https://doi.org/10.1117/12.2054703

KEYWORDS: Optical fibers, Structured optical fibers, Telescopes, Optical instrument design, Integrated optics, Roads, Prisms, Ceramics, Numerical simulations, Astronomical telescopes

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Proceedings Article | 16 September 2011 Paper

Research on calibration method of LAMOST fiber robot

Chao Zhai, Jiaru Chu, Hongzhuan Hu, Jianping Wang, Zhigang Liu

Proceedings Volume 8149, 81490H (2011) https://doi.org/10.1117/12.892989

KEYWORDS: Calibration, Telescopes, Reflector telescopes, CCD cameras, Cameras, Astronomical imaging, Spherical lenses, 3D acquisition, CCD image sensors, Chaos

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Proceedings Article | 1 October 2009 Paper

Study on the distortion prediction of focal plate

Jianping Wang, Zengxiang Zhou, Xiaofeng Li, Jiaru Chu, Hongzhuan Hu

Proceedings Volume 7427, 74270K (2009) https://doi.org/10.1117/12.826590

KEYWORDS: Finite element methods, Distortion, 3D modeling, Spherical lenses, Chemical elements, Aluminum, Optical spheres, Optical fibers, Metals, Mirrors

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Proceedings Article | 29 June 2006 Paper

Preliminary design of the collision avoidance device on the fiber positioning units of LAMOST

Zhikun Zhou, Chao Zhai, Yi Jin, Hongzhuan Hu

Proceedings Volume 6269, 626938 (2006) https://doi.org/10.1117/12.669325

KEYWORDS: Signal detection, Collision avoidance, Structured optical fibers, Control systems, Roads, Ceramics, Sensors, Computer programming, Stars, Chaos

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Proceedings Article | 29 June 2006 Paper

Preliminary study on the measurement system for LAMOST small focal plane fiber positioning system

Xiaozheng Xing, Yi Jin, Yong Teng, Chao Zhai, Hongzhuan Hu

Proceedings Volume 6269, 62693B (2006) https://doi.org/10.1117/12.670126

KEYWORDS: CCD cameras, Charge-coupled devices, Calibration, Imaging systems, Cameras, Head, Chemical elements, Photogrammetry, Roads, Neck

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Proceedings Article | 29 June 2006 Paper

Implementary scheme of parallel controllable optical fiber positioning system for LAMOST

Xiaozheng Xing, Haibo Chen, Jiaru Chu, Chao Zhai, Hongzhuan Hu, Weimin Li

Proceedings Volume 6269, 62693A (2006) https://doi.org/10.1117/12.670786

KEYWORDS: Optical fibers, Telescopes, Control systems, Structured optical fibers, Roads, Collimation, Charge-coupled devices, Optical instrument design, Calibration, Mechanics

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Proceedings Article | 28 June 2006 Paper

The measurement of profile tolerance for the small focal plane plate of LAMOST

Hongzhuan Hu, Chao Zhai, Xiaozheng Xing, Zengxiang Zhou

Proceedings Volume 6269, 62694U (2006) https://doi.org/10.1117/12.670110

KEYWORDS: Optical spheres, Tolerancing, Telescopes, Spherical lenses, Reflector telescopes, Optical fibers, Imaging systems, Roads, Spectroscopy, Astronomy

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Proceedings Article | 23 June 2006 Paper

Study on position error of fiber positioning measurement system for LAMOST

Hongzhuan Hu, Yi Jin, Yong Teng, Chao Zhai, Xiaozheng Xing

Proceedings Volume 6271, 627113 (2006) https://doi.org/10.1117/12.670167

KEYWORDS: Charge-coupled devices, Error analysis, Polishing, Surface finishing, Optical fibers, Roads, Analytical research, Chaos, Precision measurement, Computing systems

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Proceedings Article | 30 September 2004 Paper

Study on the optical fiber positioning medium-term system for LAMOST

Xiaozheng Xing, Hongzhuan Hu, Xiaobo Peng, Chao Zhai, Weimin Li

Proceedings Volume 5492, (2004) https://doi.org/10.1117/12.549785

KEYWORDS: Control systems, Optical fibers, Image processing, Computing systems, Measurement devices, Software, Frame grabbers, Charge-coupled devices, Reliability, MATLAB

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Proceedings Article | 30 September 2004 Paper

The measurement system for fiber positioning unit of LAMOST

Xiaozheng Xing, Chao Zhai, Jin Yi, Hongzhuan Hu, Weimin Li, Qiaoyun Yu

Proceedings Volume 5492, (2004) https://doi.org/10.1117/12.550880

KEYWORDS: Calibration, Image processing, CCD image sensors, CCD cameras, Digital image processing, Image acquisition, Imaging systems, Optical fibers, Telescopes, Image sensors

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Proceedings Article | 15 September 2004 Paper

Architecture of the software for LAMOST fiber positioning subsystem

Weimin Li, Xiaobo Peng, Hongzhuan Hu, Chao Zhai, Xiaozheng Xing

Proceedings Volume 5496, (2004) https://doi.org/10.1117/12.548936

KEYWORDS: Control systems, Computer programming, Image processing, Software, Charge-coupled devices, Internet, Frame grabbers, Data communications, Computer architecture, CCD image sensors

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Proceedings Article | 4 February 2003 Paper

Design of control system for fiber positioning system of LAMOST

Xiaozheng Xing, Weimin Li, Chao Zhai, Hongzhuan Hu

Proceedings Volume 4837, (2003) https://doi.org/10.1117/12.457956

KEYWORDS: Control systems, Control systems design, Structured optical fibers, Computing systems, Stars, Data conversion, Capacitors, Sensors, Position sensors, Optical fibers

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