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Noise-equivalent flux density : ウィキペディア英語版 | Noise-equivalent flux density In optics the noise-equivalent flux density (NEFD) or noise-equivalent irradiance (NEI) of a system is the level of flux density required to be equivalent to the noise present in the system. It is a measure used by astronomers in determining the accuracy of observations. The NEFD can be related to a light detector's Noise-equivalent power for a collection area ''A'' and a photon bandwidth by: , where a factor (often 2, in the case of switching between measuring a source and measuring off-source) accounts for the photon statistics for the mode of operation. ==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Noise-equivalent flux density」の詳細全文を読む
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