Mr. Zhilong Xu Profile

Zhilong Xu

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Proceedings Article | 15 December 2022 Paper

Research on automatic measurement of photoelectric performance for scientific-grade CCD detector

Pingping Yao, Zhilong Xu, Shanshan Cui, XunLong Xu, MeiNa Lu, Yi Wang, Shuang Li, Donggen Luo, Jin Hong

Proceedings Volume 12478, 124780N (2022) https://doi.org/10.1117/12.2649647

KEYWORDS: Charge-coupled devices, Sensors, CCD image sensors, Control systems, Monochromators, Process control, Light sources, Signal detection

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To appraise the photoelectric performance of area CCD for the cloud and aerosol polarization camera (CAPC), a kind of general photoelectric parameter automatic measurement apparatus is proposed. The equipment is produced possessing optical electromechanical integrated structure, which is comprised of the illumination assembly, the CCD imaging assembly and the control assembly. The software of large area CCD parameter automatic test system is designed and achieved. It can realize automatic measuring for the key parameters of a great variety of linear or area CCD, including defective pixels, dark current, relative spectral responsivity, saturation grey value, linearity error, etc. The photoelectric parameters and the spectral response of CCD produced by E2V Company are measured and processed. The research results reveal that the dark current is double when the working temperature of CCD is increased by 6℃. The relative spectral response measurement covers the spectral range from visible to near infrared bands and the spectrum resolution is 1 nm. The automatic measurement program can effectively improve the work efficiency approximately one fold and the overall test time is reduced by about one third. The evaluation of the detector performance provides a guarantee for the performance test and calibration requirements of the whole instrument.

Proceedings Article | 2 December 2020 Paper

Research on the single event effect of CCD analog front-end for satellite-borne directional polarization camera

Pingping Yao, Zhengyu Zou, Zhilong Xu, Donggen Luo, Jin Hong

Proceedings Volume 11717, 117171J (2020) https://doi.org/10.1117/12.2586826

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The directional polarimetric camera (DPC) is a satellite sensor with the aim to observe the polarization and directionality of the earth’s reflectance, developed by Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences. The analog front-end signal processor is the key to realize the conversion from the analog input signal of the front-end CCD image to the digital processing signal of the back-end. Its performance directly determines the image quality of the instrument. In this paper, the single particle locking effect of the CCD analog front-end signal processor of the Directional Polarization camera after being irradiated by high-energy particles is studied, the test scheme and the test system composition of the single particle locking effect are introduced, and the dynamic working current of the device and the change rule of the dynamic output digital code signal and other parameters are analyzed. The experimental results show that when the LET threshold of high-energy particles is greater than 13.4 MeV•cm²•mg-1, the dynamic working current of the analog front-end signal processor increases significantly, the dynamic output digital code cannot change with the change of the input signal, and single particle locking occurs in the chip. These research results provide significant reference data for in-depth study of single particle locking protection of analog front-end signal processor in space application environment.

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