Dr. Yongjun Qi Profile

Dr. Yongjun Qi

at NIAOT

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Publications (16)

Proceedings Article | 28 February 2021 Paper

Implementation of filtering method of active optical displacement sensor based on ZYNQ

Weiqi Li, Wusen Li, Wenjian Chen, Yongjun Qi

Proceedings Volume 11781, 1178108 (2021) https://doi.org/10.1117/12.2591302

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China’s LAMOST telescope is the most powerful spectroscopic measurement telescope for studying large field of view and large sample astronomy. It combines the world’s leading splicing mirror technology with thin mirror technology for the first time, breaking through the inability of previous astronomical instruments to combine large clear apertures and wide The bottleneck of the field of view. In order to more accurately detect the movement between the sub-mirrors of large-aperture telescopes, it is necessary to install a precise sensor at the edge of the sub-mirror to detect the movement between the sub-mirrors, and then adjust the mirror displacement in time through the force actuator under the mirror to obtain more Good image quality. Due to the particularity of the mirror surface, there are strict requirements on the displacement measurement accuracy of the sensor. Its research focuses on the acquisition and filtering of sensor displacement signals. In order to extract useful digital signals from strong noises and improve the signal-to-noise ratio (SNR) of the digital signals output by the detection system, this paper proposes a dual-channel digital filtering algorithm combining improved four-entry wavelet and adaptive filtering. By improving the four-entry wavelet algorithm, the algorithm improves the reconstruction capability and linearity while taking into account the multi-resolution characteristics of the traditional wavelet transform algorithm, and ensures the continuity of the wavelet coefficients at the threshold; and the second channel collects the high The frequency characteristic noise signal is processed again through adaptive filtering, and finally a sensor displacement signal with a higher signal-to-noise ratio (SNR) is obtained. After the front-end algorithm development is completed, the displacement signal acquisition and processing system is realized through the ZYNQ-7000 development platform, including AD conversion, digital filtering, signal transmission and LCD screen display, etc., and the Gui interface program is written using Matlab to convert the displacement signal Real-time display and save records on the PC side. The entire experiment of the displacement sensor was carried out at the Nanjing Institute of Astronomical Optics Technology, Chinese Academy of Sciences. The results show that the digital signal-to-noise ratio (SNR) processed by the algorithm is 20.7% higher than that of the traditional wavelet algorithm. The root mean square error (RMSE) of the fitted displacement curve is reduced by 19.8% on average, and the running time was reduced by 50%. It shows that the algorithm is accurate and fast, and its entire signal processing system has important application significance for the research of displacement sensors between splicing mirrors of large astronomical telescopes.

Proceedings Article | 8 February 2019 Paper

The signal processing system of a differential capacitive micro-displacement sensor for the controlling of segmented mirror

Wusen Li, Yongjun Qi, Wenjian Chen

Proceedings Volume 10843, 1084319 (2019) https://doi.org/10.1117/12.2506487

KEYWORDS: Sensors, Field programmable gate arrays, Capacitors, Signal processing, Amplifiers, Segmented mirrors

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Proceedings Article | 18 January 2019 Paper

Research on the software of the micro-displacement sensor in the active optical system based on FPGA

Xiaokang Xu, Wusen Li, Wenjian Chen, Yongjun Qi

Proceedings Volume 10839, 108391B (2019) https://doi.org/10.1117/12.2506479

KEYWORDS: Field programmable gate arrays, Sensors, Active optics, Analog electronics, Clocks, Mirrors, Active sensors, Data transmission, Interfaces, Data conversion

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Proceedings Article | 18 January 2019 Paper

The application of the digital filtering algorithms in the signal processing system of the micro-displacement sensor

Wusen Li, Wenjian Chen, Yongjun Qi

Proceedings Volume 10839, 108390C (2019) https://doi.org/10.1117/12.2504870

KEYWORDS: Digital filtering, MATLAB, Sensors, Interference (communication), Filtering (signal processing), Signal processing, Computer simulations, Capacitors

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Proceedings Article | 18 January 2019 Paper

A digital filtering algorithm based on four-channel wavelet and its application in active optical system

Guangbo Qiu, Wusen Li, Yongjun Qi , Wenjian Chen

Proceedings Volume 10839, 108390U (2019) https://doi.org/10.1117/12.2505100

KEYWORDS: Wavelets, Filtering (signal processing), Electronic filtering, Digital filtering, Linear filtering, Interference (communication), Signal processing, Sensors, Digital signal processing, Wavelet transforms

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Proceedings Article | 22 July 2014 Paper

Kunlun Dark Universe Survey Telescope

Yongtian Zhu, Lifan Wang, Xiangyan Yuan, Bozhong Gu, Xinnan Li, Shihai Yang, Xuefei Gong, Fujia Du, Yongjun Qi, Lingzhe Xu

Proceedings Volume 9145, 91450E (2014) https://doi.org/10.1117/12.2055768

KEYWORDS: Telescopes, Mirrors, Computer programming, Control systems, Domes, Surface finishing, Assembly equipment, Optics manufacturing, CCD cameras, Image quality

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Proceedings Article | 18 July 2014 Paper

A CCD experimental platform for large telescope in Antarctica based on FPGA

Yuhua Zhu, Yongjun Qi

Proceedings Volume 9152, 91521Y (2014) https://doi.org/10.1117/12.2055799

KEYWORDS: Charge-coupled devices, Field programmable gate arrays, Analog electronics, Large telescopes, Telecommunications, Control systems, Image processing, CCD cameras, Human-machine interfaces, Astronomy

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Proceedings Article | 18 July 2008 Paper

Pre-research on arithmetic for facing control of segmented-mirror in LAMOST

Hanjie Miao, Yongjun Qi

Proceedings Volume 7019, 70192A (2008) https://doi.org/10.1117/12.786507

KEYWORDS: Sensors, Mirrors, Actuators, Spherical lenses, Condition numbers, Astronomy, Telescopes, Active optics, Modulation, Astronomical imaging

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Proceedings Article | 18 July 2008 Paper

A type of displacement actuator applied on LAMOST

Yajun Zhang, Yongjun Qi

Proceedings Volume 7019, 701928 (2008) https://doi.org/10.1117/12.786585

KEYWORDS: Actuators, Mirrors, Active optics, Astronomical telescopes, Zoom lenses, Interferometers, Telescopes, Analytical research, Temperature metrology, Mirror pointing

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Proceedings Article | 21 November 2007 Paper

Control system of position actuators for segmented mirror active optics in LAMOST

Xixia Du, Zhenchao Zhang, Yongjun Qi, Aihua Li

Proceedings Volume 6721, 672106 (2007) https://doi.org/10.1117/12.782688

KEYWORDS: Actuators, Control systems, Active optics, Segmented mirrors, Telescopes, Astronomical imaging, Spectroscopy, Reflector telescopes, Spherical lenses, Mirrors

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Proceedings Article | 1 November 2007 Paper

Application study on giant-magnetostrictive actuator for driving segmented mirrors of very large astronomical telescope

Bintang Yang, Dehua Yang, Guang Meng, Kunxin Chen, Yongjun Qi, Haiting Zhou, Peiyong Hou

Proceedings Volume 6423, 64230Z (2007) https://doi.org/10.1117/12.779371

KEYWORDS: Actuators, Mirrors, Astronomical telescopes, Adaptive optics, Magnetism, Active optics, Prototyping, Segmented mirrors, Telescopes, Sensors

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Proceedings Article | 6 July 2006 Paper

Displacement sensors applied on active optics in an astronomical telescope

Yongjun Qi, Zhenchao Zhang

Proceedings Volume 6275, 62751X (2006) https://doi.org/10.1117/12.670921

KEYWORDS: Sensors, Active optics, Active sensors, Interferometers, Astronomical telescopes, Temperature metrology, Telescopes, Mirrors, Error analysis, Space telescopes

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Proceedings Article | 28 June 2006 Paper

Low-order AO system in LAMOST

Xiangyan Yuan, Xiangqun Cui, Genrong Liu, Yong Zhang, Yongjun Qi

Proceedings Volume 6272, 62723O (2006) https://doi.org/10.1117/12.669749

KEYWORDS: Adaptive optics, Monochromatic aberrations, Mirrors, Deformable mirrors, Telescopes, Wavefronts, Active optics, Actuators, Spherical lenses, Photovoltaics

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Proceedings Article | 31 August 2005 Paper

Measurement of the actuation transmitting mechanism of the segment prototype of the LAMOST telescope

Dehua Yang, Yongjun Qi

Proceedings Volume 5877, 58770V (2005) https://doi.org/10.1117/12.612478

KEYWORDS: Sensors, Actuators, Prototyping, Environmental sensing, Active optics, Data corrections, Telescopes, Optical resolution, Environmental monitoring, Mirrors

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Proceedings Article | 9 May 2000 Paper

High-precision phase shift of optic fiber sensor applied to laser dynamic-fixed distance measurement

Yongjun Qi, Zeying Chi

Proceedings Volume 4077, (2000) https://doi.org/10.1117/12.385529

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Proceedings Article | 13 August 1998 Paper

Factors affecting the ranging accuracy of laser optical fiber dynamic fixed-distance detection system

Yongjun Qi, Zeying Chi, Wenjian Chen

Proceedings Volume 3555, (1998) https://doi.org/10.1117/12.318179

KEYWORDS: Signal detection, Ranging, Fiber lasers, Sensors, Optical fibers, Dynamical systems, Reflectivity, Target detection, Explosives, Detection theory

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Showing 5 of 16 publications

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