Ms. Manli Shi Profile

Manli Shi

at Beijing Institute of Space Mechanics & Electricity

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Publications (2)

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Proceedings Article | 4 December 2024 Paper

Dark current characterisation of HgCdTe infrared detectors

Xin Chen, Yong Chen, Xuguang Deng, Jiushuang Zhang, Manli Shi, Qian Zhang, Weiming Tong, Dacheng Tian

Proceedings Volume 13283, 132830N (2024) https://doi.org/10.1117/12.3033850

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Dark current is the main factor affecting the performance of the HgCdTe detector, and this paper analyses the dark current according to the production mechanism of dark current. Temperature, bias voltage, wavelength and Cd composition all affect the size and composition of dark current. The higher the temperature, the larger the dark current, the diffusion current and the production-complex current dominate above the critical temperature point, and the tunnelling current dominates below the critical temperature; within the allowable deviation range, the high bias voltage shows a larger dark current due to the dominance of the tunnelling current; the longer the wavelength, the smaller the Eg becomes, and the larger the dark. The larger the Cd composition becomes, the larger the Eg becomes, and the direct tunnelling current become the dominance of dark current. By analysing the influence factors of dark current, it has some guiding significance to improve the development process of the detector, and to set up a new system of dark current of the detector, and to set the appropriate working temperature and bias voltage when the detector is used, so that the detector can work in the best performance.

Proceedings Article | 27 March 2022 Paper

Development technology of large surface source infrared calibration blackbody on satellite

H.W. Dong, H. Li, M.L. Shi, F.D. Li, L. Wang, X. Chen, T. Yang, Y.X. Liu, M.L. Lian, Z.C. Shi

Proceedings Volume 12169, 121693T (2022) https://doi.org/10.1117/12.2623813

KEYWORDS: Black bodies, Body temperature, Calibration, Temperature metrology, Resistance, Control systems, Satellites, Platinum, Infrared radiation, Cameras

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This article elaborates on the working principle of the on-board blackbody calibration system, through the high-performance design and accurate index accuracy of the key indicators of high and low large-aperture surface blackbody (effective emission surface normal emissivity, temperature stability, temperature uniformity) Effective control, so as to obtain high and low temperature blackbody normal emissivity 0.98, temperature stability ≤ ± 0.15K/30min, temperature uniformity ±0.25K high-performance calibration indicators. By adding different thermal control measures to the high temperature black body and the low temperature black body, the temperature stability of the working temperature control interval required by each can be obtained. Among them, the temperature of the high-temperature black body is realized by applying a heat sheet with a reasonable cloth, while the temperature of the low-temperature black body is lower than the ambient temperature in the camera, and the temperature compensation is realized by installing a heat sink in the cold space, and then attaching the heating sheet to the heat pipe. For both high temperature blackbody and low temperature blackbody, precision platinum resistance thermometers are used to accurately monitor their temperature in real time. By reasonably arranging the position of the platinum resistance and the platinum resistance test line, the blackbody temperature measurement accuracy can be controlled within ±0.05°C. In the end, the high-stability large-aperture blackbody calibration system through the comprehensive work of various structural components, thermal control components and the main optical system to obtain the high-precision infrared temperature calibration requirements required by the load, which provides for subsequent model development. Successful engineering experience.

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