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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 power ： ウィキペディア英語版 Noise-equivalent power Noise-equivalent power (NEP) is a measure of the sensitivity of a photodetector or detector system. It is defined as the signal power that gives a signal-to-noise ratio of one in a one hertz output bandwidth.〔P.L. Richards, "Bolometers for infrared and millimeter waves," ''Journal of Applied Physics'' 76, 1 (1994), 〕 An output bandwidth of one hertz is equivalent to half a second of integration time.〔The factor of one half is explained by the Nyquist–Shannon sampling theorem.〕 The units of NEP are watts per square root hertz. The NEP is equal to the noise spectral density (expressed in units of $\backslash mathrm/\backslash sqrt/\backslash sqrt/\backslash mathrm$ or $\backslash mathrm/\backslash mathrm$, respectively). A smaller NEP corresponds to a more sensitive detector. For example, a detector with an NEP of $10^\; \backslash mathrm/\backslash sqrt\{\backslash mathrm\{Hz\}\}$ can detect a signal power of one picowatt with a signal-to-noise ratio (SNR) of one after one half second of averaging. The SNR improves as the square root of the averaging time, and hence the SNR in this example can be improved to 10 by averaging for 50 seconds. If the NEP refers to the signal power absorbed in the detector, it is known as the electrical NEP. If instead it refers to the signal power incident on the detector system, it is called the optical NEP. The optical NEP is equal to the electrical NEP divided by the optical coupling efficiency of the detector system. ==References and footnotes== 〔 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 power」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.