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Noise-equivalent flux density
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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 \nu by:
NEFD = \eta \frac, where a factor \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)
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