Research on quantum efficiency calibration of SVOM VT CCDs

Yue Pan; Lijun Dan; Zhonghan Sun; Chao Huang; Wei Li; Fengtao Wang; Hui Zhao; Jian Zhang

doi:10.1117/12.3007801

18 December 2023 Research on quantum efficiency calibration of SVOM VT CCDs

Yue Pan, Lijun Dan, Zhonghan Sun, Chao Huang, Wei Li, Fengtao Wang, Hui Zhao, Jian Zhang

Proceedings Volume 12965, AOPC 2023: Novel Technologies and Instruments for Astronomical Imaging and Spectroscopy; 129650B (2023) https://doi.org/10.1117/12.3007801
Event: Applied Optics and Photonics China 2023 (AOPC2023), 2023, Beijing, China

Abstract

The successful achievement of the scientific objectives of the Visible Telescope (VT) in the Space Multi-band Variable Object Monitor (SVOM) mission relies heavily on high-precision quantum efficiency calibration. The calibration process for the VT CCD presents a challenge due to the requirement for extremely low radiation levels given the long integration time of the CCD. To address the difficulty in accurately measuring such low radiance, a two-step calibration method is employed. This method involves the use of two photodiodes, one positioned at the CCD location and the other in an integrating sphere. In the first step, the proportional relationship between the measured illuminance values of the two photodiodes is calibrated under high illumination conditions. This step establishes a reliable reference for subsequent calibrations. In the second step, the CCD is calibrated using the integrating sphere photodiode under low illumination conditions. The measured illuminance is then converted to the CCD position. Experimental results have demonstrated the effectiveness of this two-step calibration method, achieving a quantum efficiency calibration uncertainty of 1.7%. This approach provides a reliable and accurate means of calibrating the quantum efficiency of the CCD in the VT instrument.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yue Pan, Lijun Dan, Zhonghan Sun, Chao Huang, Wei Li, Fengtao Wang, Hui Zhao, and Jian Zhang "Research on quantum efficiency calibration of SVOM VT CCDs", Proc. SPIE 12965, AOPC 2023: Novel Technologies and Instruments for Astronomical Imaging and Spectroscopy, 129650B (18 December 2023); https://doi.org/10.1117/12.3007801

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