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The nonlinear photon transfer curve of CCDs and its effects on photometry
Alternative Title11
Ma, Bin1; Shang, Zhaohui; Wang, Lifan; Hu, Yi; Liu, Qiang; Wei, Peng
2014
Source PublicationProceedings of SPIE - The International Society for Optical Engineering
ISSN0277-786X
Volume9154Issue:0Pages:0
AbstractThe photon transfer curve (PTC, variance vs. signal level) is a commonly used and effective tool in characterizing CCD performance. It is theoretically linear in the range where photon shot noise dominates, and its slope is utilized to derive the gain of the CCD. However, recent researches on different CCDs have revealed that the variance progressively drops at high signal levels, while the linearity shown by signal versus exposure time is still excellent and unaffected. On the other hand, bright stars are found to exhibit fatter point spread function (PSF). Both nonlinear PTC and the brighter-fatter effect are regarded as the result of spreading of charges between pixels, an interaction progress increasing with signal level. In this work we investigate the nonlinear PTC based on the images with a STA1600FT CCD camera, whose PTC starts to become nonlinear at about 1/3 full well. To explain the phenomenon, we present a model to characterize the charge-sharing PSF. This signal-dependent PSF can be derived from flat-field frames, and allow us to quantify the effects on photometry and measured shape of stars. This effect is essentially critical for projects requiring accurate photometry and shape parameters. © 2014 SPIE.(9 refs)
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10620
Collection南极天文中心
Recommended Citation
GB/T 7714
Ma, Bin1,Shang, Zhaohui,Wang, Lifan,et al. The nonlinear photon transfer curve of CCDs and its effects on photometry[J]. Proceedings of SPIE - The International Society for Optical Engineering,2014,9154(0):0.
APA Ma, Bin1,Shang, Zhaohui,Wang, Lifan,Hu, Yi,Liu, Qiang,&Wei, Peng.(2014).The nonlinear photon transfer curve of CCDs and its effects on photometry.Proceedings of SPIE - The International Society for Optical Engineering,9154(0),0.
MLA Ma, Bin1,et al."The nonlinear photon transfer curve of CCDs and its effects on photometry".Proceedings of SPIE - The International Society for Optical Engineering 9154.0(2014):0.
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