Spatial uniformity and temporal stability of pixel-to-pixel variation in mini-SiTian CMOS detector

High-precision flat-fields correction is essential for precision astronomical photometry, with pixel-to-pixel variation correction playing a key role. This study quantitatively evaluates the temporal stability and spatial uniformity of pixel-to-pixel variations in the Sony IMX455 ZWO ASI6200MM Pro CMOS detector, using flat-fields images observed by mini-SiTian. We developed a pixel-to-pixel variation correction strategy with universal applicability. Our results show that pixel-to-pixel variations are typically ∼0.365%, with temporal stability better than 0.1% over one year. A stable, time-invariant spatial non-uniformity at the level of ∼0.006% is also identified. We further investigate the effects of binning, the correlation between the responses of adjacent pixels, and provide a rough comparison with two e2v CCD detectors. This work offers a comprehensive characterization of pixel-level stability in CMOS detectors and delivers strategic insights for future survey projects focused on precision photometric performance.

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Publication Details

Journal
Scientific Reports
Published
2025-11-20
DOI
https://doi.org/10.1038/s41598-025-24999-1
Primary Topic
CCD and CMOS Imaging Sensors
Type
article
Field-Weighted Citation Impact
0.00

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article

Spatial uniformity and temporal stability of pixel-to-pixel variation in mini-SiTian CMOS detector

Guozhen Hu, Haibo Yuan, Min He, Yang Huang et al.
Scientific Reports
CCD and CMOS Imaging Sensors
article

Spatial uniformity and temporal stability of pixel-to-pixel variation in mini-SiTian CMOS detector

Guozhen Hu, Haibo Yuan, Min He, Yang Huang, Shuai Xu, Jie Zheng, Shuai Feng, Lin Yang, Wenyuan Cui, Kai Xiao, Hongrui Gu, Xiaolu Li, Yu Zhang, Hong Wu, Bowen Huang, Yuanchang Wang, Linying Mi
article en

Abstract

High-precision flat-fields correction is essential for precision astronomical photometry, with pixel-to-pixel variation correction playing a key role. This study quantitatively evaluates the temporal stability and spatial uniformity of pixel-to-pixel variations in the Sony IMX455 ZWO ASI6200MM Pro CMOS detector, using flat-fields images observed by mini-SiTian. We developed a pixel-to-pixel variation correction strategy with universal applicability. Our results show that pixel-to-pixel variations are typically ∼0.365%, with temporal stability better than 0.1% over one year. A stable, time-invariant spatial non-uniformity at the level of ∼0.006% is also identified. We further investigate the effects of binning, the correlation between the responses of adjacent pixels, and provide a rough comparison with two e2v CCD detectors. This work offers a comprehensive characterization of pixel-level stability in CMOS detectors and delivers strategic insights for future survey projects focused on precision photometric performance.

Scientific ReportsVol. 15(1)
Chinese Academy of Sciences (CN), Beijing Electronic Science and Technology Institute (CN), Beijing Normal University (CN), Institute of Space Sciences (ES), National Space Science Center (CN), Astronomy and Space (AU), National Astronomical Observatories (CN), Dezhou University (CN), Hebei Normal University (CN), Hebei GEO University (CN)
National Science Foundation, National Natural Science Foundation of China, China Postdoctoral Science Foundation, Hebei Normal University
Openalex Percentile: Top 65%
CCD and CMOS Imaging Sensors
DOIOpen Access PDFOpenAlex
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