A new method of CCD dark current correction via extracting the dark information from scientific images
We have developed a new method to correct dark current at relatively high temperatures for Charge-Coupled Device (CCD) images when dark frames cannot be obtained on the telescope. For images taken with the Antarctic Survey Telescopes (AST3) in 2012, due to the low cooling efficiency, the median CCD...
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ftdatacite:10.48550/arxiv.1407.8279 2023-05-15T14:00:17+02:00 A new method of CCD dark current correction via extracting the dark information from scientific images Ma, Bin Shang, Zhaohui Hu, Yi Liu, Qiang Wang, Lifan Wei, Peng 2014 https://dx.doi.org/10.48550/arxiv.1407.8279 https://arxiv.org/abs/1407.8279 unknown arXiv https://dx.doi.org/10.1117/12.2055416 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Instrumentation and Methods for Astrophysics astro-ph.IM FOS Physical sciences article-journal Article ScholarlyArticle Text 2014 ftdatacite https://doi.org/10.48550/arxiv.1407.8279 https://doi.org/10.1117/12.2055416 2022-04-01T12:50:35Z We have developed a new method to correct dark current at relatively high temperatures for Charge-Coupled Device (CCD) images when dark frames cannot be obtained on the telescope. For images taken with the Antarctic Survey Telescopes (AST3) in 2012, due to the low cooling efficiency, the median CCD temperature was -46$^\circ$C, resulting in a high dark current level of about 3$e^-$/pix/sec, even comparable to the sky brightness (10$e^-$/pix/sec). If not corrected, the nonuniformity of the dark current could even overweight the photon noise of the sky background. However, dark frames could not be obtained during the observing season because the camera was operated in frame-transfer mode without a shutter, and the telescope was unattended in winter. Here we present an alternative, but simple and effective method to derive the dark current frame from the scientific images. Then we can scale this dark frame to the temperature at which the scientific images were taken, and apply the dark frame corrections to the scientific images. We have applied this method to the AST3 data, and demonstrated that it can reduce the noise to a level roughly as low as the photon noise of the sky brightness, solving the high noise problem and improving the photometric precision. This method will also be helpful for other projects that suffer from similar issues. : 8 pages, 5 figures, Proc. SPIE 9154 (2014) Text Antarc* Antarctic DataCite Metadata Store (German National Library of Science and Technology) Antarctic The Antarctic |
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DataCite Metadata Store (German National Library of Science and Technology) |
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topic |
Instrumentation and Methods for Astrophysics astro-ph.IM FOS Physical sciences |
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Instrumentation and Methods for Astrophysics astro-ph.IM FOS Physical sciences Ma, Bin Shang, Zhaohui Hu, Yi Liu, Qiang Wang, Lifan Wei, Peng A new method of CCD dark current correction via extracting the dark information from scientific images |
topic_facet |
Instrumentation and Methods for Astrophysics astro-ph.IM FOS Physical sciences |
description |
We have developed a new method to correct dark current at relatively high temperatures for Charge-Coupled Device (CCD) images when dark frames cannot be obtained on the telescope. For images taken with the Antarctic Survey Telescopes (AST3) in 2012, due to the low cooling efficiency, the median CCD temperature was -46$^\circ$C, resulting in a high dark current level of about 3$e^-$/pix/sec, even comparable to the sky brightness (10$e^-$/pix/sec). If not corrected, the nonuniformity of the dark current could even overweight the photon noise of the sky background. However, dark frames could not be obtained during the observing season because the camera was operated in frame-transfer mode without a shutter, and the telescope was unattended in winter. Here we present an alternative, but simple and effective method to derive the dark current frame from the scientific images. Then we can scale this dark frame to the temperature at which the scientific images were taken, and apply the dark frame corrections to the scientific images. We have applied this method to the AST3 data, and demonstrated that it can reduce the noise to a level roughly as low as the photon noise of the sky brightness, solving the high noise problem and improving the photometric precision. This method will also be helpful for other projects that suffer from similar issues. : 8 pages, 5 figures, Proc. SPIE 9154 (2014) |
format |
Text |
author |
Ma, Bin Shang, Zhaohui Hu, Yi Liu, Qiang Wang, Lifan Wei, Peng |
author_facet |
Ma, Bin Shang, Zhaohui Hu, Yi Liu, Qiang Wang, Lifan Wei, Peng |
author_sort |
Ma, Bin |
title |
A new method of CCD dark current correction via extracting the dark information from scientific images |
title_short |
A new method of CCD dark current correction via extracting the dark information from scientific images |
title_full |
A new method of CCD dark current correction via extracting the dark information from scientific images |
title_fullStr |
A new method of CCD dark current correction via extracting the dark information from scientific images |
title_full_unstemmed |
A new method of CCD dark current correction via extracting the dark information from scientific images |
title_sort |
new method of ccd dark current correction via extracting the dark information from scientific images |
publisher |
arXiv |
publishDate |
2014 |
url |
https://dx.doi.org/10.48550/arxiv.1407.8279 https://arxiv.org/abs/1407.8279 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://dx.doi.org/10.1117/12.2055416 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.1407.8279 https://doi.org/10.1117/12.2055416 |
_version_ |
1766269337710100480 |