Ms. Jianan Dang Profile

Jianan Dang

at XIOPM CAS

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Proceedings Article | 5 November 2020 Paper

Space-based missile warning technology based on fine spectrum of potassium atoms in exhaust plumes

Sufeng Wang, Kujun Wu, Yutao Feng, Chenguang Chang, Jianan Dang, Bingliang Hu

Proceedings Volume 11566, 1156607 (2020) https://doi.org/10.1117/12.2574904

KEYWORDS: Potassium, Missiles, Signal to noise ratio, Sensors, Absorption, Optical filters, Target detection

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The main propose of this paper is to discuss the possibility of a space-based early warning technology for missiles in boost phase based on the near-infrared fine spectrum of potassium atoms in the exhaust plume. Emission transfer link from the exhaust plume to the detector is established in combination with the observation model of satellite and target on the ground. Line-by-line integral method is used to calculate the characteristic spectrum of potassium atoms. The result shows the potassium line have high spectral emissivity and narrow bandwidth. The analyses on the atmospheric transmission and background radiation indicate that the atmospheric transmission of the 769.896 nm potassium line is higher than that of the 766.490 nm potassium line which lies on top of an O₂ line, and the irradiance of the 769.896 nm line is stronger than that of background and the 766.490 nm line. Considering atmospheric transmission and background radiation, it is suitable to choose the 769.896 nm line to detect the exhaust plume of the missile. According to the characteristic of potassium atoms emission line with narrow bandwidth, a 1.2 nm wide filter centered on 770nm is used to extract target signal. The maximum detection range and other indexes are evaluated. The simulation results show that ultra-narrow band filter can achieve a large degree of background suppression, and the system performance indexes meet the detection requirements. Therefore, it is feasible that missile detection can be realized by using near-infrared fine spectrum of potassium atoms.

Proceedings Article | 5 November 2020 Paper

Research on flexible structure of a space flight prototype Doppler asymmetric spatial heterodyne interferometer

Jianan Dang, Jian Sun, Yutao Feng, Chenguang Chang, Yang Wu

Proceedings Volume 11564, 115640D (2020) https://doi.org/10.1117/12.2580203

KEYWORDS: Interferometers, Doppler effect, Structural design, Safety, Prototyping, Optics manufacturing, Heterodyning, Atmospheric sensing, Adhesives

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As a new type of wind field detection technology, Doppler Asymmetric Spatial Heterodyne（DASH）can invert information such as atmospheric wind speed by monitoring the Doppler frequency shift of the absorption line or emission line of the atmospheric composition. It is widely used in the detection of middle and upper atmospheric wind fields. In this paper, a flexible support structure suitable for DASH interferometer is designed, so that the bonding process between different materials has a high safety margin in environmental testing. After modal analysis and random vibration analysis of the whole structure, the results show that the design meets the requirements. First, the fundamental frequency of the interferometer (765.79Hz>100Hz) meets the requirements of general satellites for the load; secondly, the random vibration analysis results show that the bonding stress between the surfaces is less than the allowable stress of the material (2MPa<14MPa), and it has a certain safety margin (>2); finally, the optical parts and structural parts did not collide with the structural parts during the vibration process, and the flexible structure did not undergo plastic deformation, and the whole structure of the interferometer was safe and reliable

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