Auroral all-sky camera calibration
| Autor: | S. A. Chernouss, Urban Brandstrom, D. A. Lorentzen, S. E. Holmen, Drummond Biles, Charles Deehr, Bjørn Lybekk, Xiangcai Chen, Fred Sigernes, Lisa Baddeley, H. Bjørklund, Espen Trondsen, Joran Moen, M. Dyrland, T. S. Trondsen |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Physics
Atmospheric Science Brightness Pixel business.industry media_common.quotation_subject lcsh:QC801-809 Geology Oceanography lcsh:Geophysics. Cosmic physics symbols.namesake Optics Integrating sphere Spectral sensitivity Sky Observatory symbols Rayleigh scattering business Camera resectioning media_common Remote sensing |
| Zdroj: | Geoscientific Instrumentation, Methods and Data Systems, Vol 3, Iss 2, Pp 241-245 (2014) |
| ISSN: | 2193-0864 |
| Popis: | A two-step procedure to calibrate the spectral sensitivity to visible light of auroral all-sky cameras is outlined. Center pixel response is obtained by the use of a Lambertian surface and a standard 45W tungsten lamp. Screen brightness is regulated by the distance between the lamp and the screen. All-sky flat-field correction is carried out with a 1 m diameter integrating sphere. A transparent Lexan dome at the exit port of the sphere is used to simulate observing conditions at the Kjell Henriksen Observatory (KHO). A certified portable low brightness source from Keo Scientific Ltd. was used to test the procedure. Transfer lamp certificates in units of Rayleigh per Ångstrøm (R Å−1) are found to be within a relative error of 2%. An all-sky camera flat-field correction method is presented with only 6 required coefficients per channel. |
| Databáze: | OpenAIRE |
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