Prof. Hongzhuan Hu Profile

Prof. Hongzhuan Hu

Associate Professor at West Campus of Univ of Sci. and Tech. of China

SPIE Involvement:

Author

Publications (35)

Proceedings Article | 16 May 2024 Paper

Design of FPGA-based LAMOST fiber position edge detection module

Qiyun Shen, Congcong Du, Yingfu Wang, Hongzhuan Hu, Jianping Wang, Jiaru Chu, Zhigang Liu, Zengxiang Zhou

Proceedings Volume 13166, 131660W (2024) https://doi.org/10.1117/12.3029247

KEYWORDS: Detection and tracking algorithms, Image processing, Image segmentation, Image processing algorithms and systems, Field programmable gate arrays, Cameras, Edge detection, Clocks, Design, Telescopes

Read Abstract +

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

Read Abstract +

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

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

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

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

Read Abstract +

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

Read Abstract +

Proceedings Article | 13 December 2020 Poster + Paper

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

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

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

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

Read Abstract +

Proceedings Article | 13 December 2020 Poster + Paper

A new metrology method for optical fiber position detection

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

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

Read Abstract +

Proceedings Article | 13 December 2020 Paper

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

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

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

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

Read Abstract +

Proceedings Article | 13 December 2020 Poster + Paper

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

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

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

Read Abstract +

Proceedings Article | 10 July 2018 Paper

Structural error simulation analysis of LAMOST fiber units

Xinyu Feng, Yonggang Gu, 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

Read Abstract +

Proceedings Article | 10 July 2018 Paper

Photogrammetry-based metrology of fiber positioner in LAMOST

Lianpo Wang, Ye Zhu, Yonggang Gu, 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

Read Abstract +

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

Read Abstract +

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

Feng Cheng, Yonggang Gu, Hongzhuan Hu, Chao Zhai

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

Read Abstract +

Proceedings Article | 9 July 2018 Paper

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

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

Read Abstract +

Proceedings Article | 9 July 2018 Paper

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

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

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

Read Abstract +

Proceedings Article | 6 July 2018 Paper

The fiber view metrology system design for spectral survey telescope

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

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

Read Abstract +

Proceedings Article | 22 July 2016 Paper

Research and implementation of the integrated cooling system for focal plate

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

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

Read Abstract +

Proceedings Article | 22 July 2016 Paper

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

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

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

Read Abstract +

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

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

Read Abstract +

Proceedings Article | 19 August 2014 Paper

Research of fiber position measurement by multi CCD cameras

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

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

Read Abstract +

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

Read Abstract +

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

Read Abstract +

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

Read Abstract +

Proceedings Article | 16 September 2011 Paper

Research on calibration method of LAMOST fiber robot

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

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

Read Abstract +

Proceedings Article | 1 October 2009 Paper

Study on the distortion prediction of focal plate

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

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

Read Abstract +

Proceedings Article | 29 June 2006 Paper

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

Chao Zhai, Zhikun Zhou, 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

Read Abstract +

Proceedings Article | 29 June 2006 Paper

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

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

Read Abstract +

Proceedings Article | 29 June 2006 Paper

Implementary scheme of parallel controllable optical fiber positioning system for LAMOST

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

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

Read Abstract +

Proceedings Article | 28 June 2006 Paper

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

Zengxiang Zhou, Chao Zhai, Xiaozheng Xing, Hongzhuan Hu

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

Read Abstract +

Proceedings Article | 23 June 2006 Paper

Study on position error of fiber positioning measurement system for LAMOST

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

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

Read Abstract +

Proceedings Article | 30 September 2004 Paper

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

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

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

Read Abstract +

Proceedings Article | 30 September 2004 Paper

The measurement system for fiber positioning unit of LAMOST

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

Read Abstract +

Proceedings Article | 15 September 2004 Paper

Architecture of the software for LAMOST fiber positioning subsystem

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

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

Read Abstract +

Proceedings Article | 4 February 2003 Paper

Design of control system for fiber positioning system of LAMOST

Chao Zhai, Xiaozheng Xing, Hongzhuan Hu, Weimin Li

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

Read Abstract +