Prof. Baoquan Li Profile

Prof. Baoquan Li

at National Space Science Ctr CAS

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Publications (7)

Proceedings Article | 12 March 2021 Paper

A comparison of models for correcting astronomical atmospheric refraction

Daochun Yu, Haitao Li, Baoquan Li

Proceedings Volume 11763, 1176309 (2021) https://doi.org/10.1117/12.2585676

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Proceedings Article | 18 December 2019 Paper

A new composition in-situ analyzing instrument of planetary rocks and soils

Huan Mou, Baoquan Li, Yang Cao, Haitao Li

Proceedings Volume 11341, 113410H (2019) https://doi.org/10.1117/12.2541721

KEYWORDS: X-rays, X-ray sources, Chemical elements, X-ray detectors, X-ray fluorescence spectroscopy

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It might preserve vital clues about the imprints of life and the past livability of the planet, which are important information for studying the origin and the history of the planet, of planetary rocks or soils, so the measurement of planetary rock or soil composition is a basis of planetary exploration. Most of current composition analysis of rocks or soils, based on alpha particle backscattering technique and spectrum measurement of laser excitation, has disadvantages of low measurement accuracy, large resource demand and long measurement time. So it is urgent to seek different methods to measure the rocks or soils of planetary. A few of merits are included in x-ray active excitation mode: firstly, it has good resolution ability for elements above medium quality; secondly, the detection sensitivity of elements can reduce to 10ppm. As long as anode targets are changed, the detection sensitivity of any element can be matched. JPL is developing a prototype of a new rock composition analysis instrument based on x-ray source in order to satisfy the needs of NASA Mars 2020 exploration. It is irreplaceable as the next generation of planetary rocks or soils composition analysis instrument of x-ray active excitation mode. Therefore, the core content of this paper is to develop a composition analysis instrument, which integrates miniature x-ray source with the silicon drift detector (SDD).As the key technology of x-ray active excitation mode, miniature x-ray source must meet the needs of low power consumption, self-sealing, high intensity and micro-focus spot. For this purpose, a design proposal of the miniature x-ray source is proposed and its theoretical model is established. The size of cathode structure greatly impacts on the size of the whole miniature x-ray tube on account of the simplicity structure of x-ray tubes. So compared with the traditional x-ray source, a new cathode structure is used for the sake of reducing the whole size of the miniature x-ray tube. Not only that, but the size of cathode structure has influence on the structure of filaments, the magnitude of current and the size of focal spot of x-rays. At the same time, mini focal spot is needed to enhance the resolution ratio and intensity of rocks or soils composition analysis instruments. Hence, it is indispensable to optimize the cathode structure in order to realize the miniature size and mini focal spot. A simulation model has been set up based on theoretical calculation and simulated using charged particle optics software COMSOL or SIMION. The shape and the size of x-ray tube’s cathode have been optimized so as to attain the mini focal spot. Additionally, the influence of high voltage loaded on the cathode or the filament to focal spot size has been taken fully into account. Moreover, the SDD detector is also integrated with the miniature x-ray source and the whole volume of the composition analysis instrument decreases which is beneficial to the deep space exploration.

Proceedings Article | 8 March 2017 Paper

A sCMOS camera and its tests for focal plane metrology and PSF centroiding experiment

Haitao Li, Baoquan Li, Yang Cao, Ligang Li, Jianfeng Yang, Wei Ge, Baogang Lv, Jinyou Tao

Proceedings Volume 10255, 102551P (2017) https://doi.org/10.1117/12.2268565

KEYWORDS: Metrology, Cameras, Point spread functions, Sensors, Camera shutters, Exoplanets, Imaging systems, Exoplanetary science, Space operations, Velocity measurements

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Proceedings Article | 28 February 2017 Paper

Inter-satellites x-ray communication system

Huan Mou, Bao-quan Li

Proceedings Volume 10256, 102561W (2017) https://doi.org/10.1117/12.2257214

KEYWORDS: X-rays, Modulation, Telecommunications, X-ray sources, Antennas, RF communications, X-ray detectors, Avalanche photodetectors, Photons, Laser communications

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Proceedings Article | 19 October 2016 Paper

A focal plane metrology system and PSF centroiding experiment

Haitao Li, Baoquan Li, Yang Cao, Ligang Li

Proceedings Volume 10155, 101550S (2016) https://doi.org/10.1117/12.2244938

KEYWORDS: Metrology, Point spread functions, Exoplanets

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Proceedings Article | 5 August 2015 Paper

Preliminary results of centroiding experiment for the STEP mission

Haitao Li, Baoquan Li, Yang Cao, Ding Chen, Ligang Li

Proceedings Volume 9622, 96221A (2015) https://doi.org/10.1117/12.2193363

KEYWORDS: Stars, Calibration, Planets, Sensors, Metrology, Space telescopes, Detection and tracking algorithms, Detector arrays, Quantum efficiency, Heterodyning

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Proceedings Article | 31 December 2013 Paper

The Lyman-alpha Imager onboard Solar Polar Orbit Telescope

Baoquan Li, Haitao Li, Sizhong Zhou, Bo Jiang

Proceedings Volume 9042, 90420Y (2013) https://doi.org/10.1117/12.2035494

KEYWORDS: Magnetism, Space telescopes, Solar processes, Telescopes, Charge-coupled devices, Imaging systems, Mirrors, Coronagraphy, Curium, Spatial resolution

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Showing 5 of 7 publications

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