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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Noise-equivalent irradiance ： 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 $\backslash nu$ by: $NEFD\; =\; \backslash eta\; \backslash frac$, where a factor $\backslash eta$ (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 スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.