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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 Diffusing-wave spectroscopy ： ウィキペディア英語版 Diffusing-wave spectroscopy Diffusing-wave spectroscopy (DWS) is an optical technique derived from dynamic light scattering (DLS) that studies the dynamics of scattered light in the limit of strong multiple scattering.〔 〕〔 〕 It has been widely used in the past to study colloidal suspensions, emulsions, foams, gels, biological media and other forms of soft matter. If carefully calibrated, DWS allows the quantitative measurement of microscopic motion in a soft material, from which the rheological properties of the complex medium can be extracted ''via'' the so-called microrheology approach. ==One-speckle diffusing-wave spectroscopy== Laser light is sent to the sample and the outcoming transmitted or backscattered light is detected by an optoelectric sensor. The light intensity detected is the result of the interference of all the optical waves coming from the different light paths. Image:figureDWS.png|Typical setup of diffusing-wave spectroscopy The signal is analysed by calculating the intensity autocorrelation function called g2. $g\_2(\backslash tau)=\backslash frac$ For the case of non-interacting particles suspended in a (complex) fluid a direct relation between g2-1 and the mean squared displacement of the particles <Δr2> can be established. Let's note P(s) the probability density function (PDF) of the photon path length s. The relation can be written as follows:〔 〕 $g\_2(\backslash tau)-1=()^2$ with $k\_0=\backslash frac$ and $l$ * is the transport mean free path of scattered light. For simple cell geometries, it is thus possible to calculate the mean squared displacement of the particles <Δr2> from the measured g2-1 values analytically. For example, for the backscattering geometry, an infinitely thick cell, large laser spot illumination and detection of photons coming from the center of the spot, the relation ship between g2-1 and <Δr2> is: $g\_2(\backslash tau)-1=\backslash exp\backslash left(-2\; \backslash gamma\; \backslash sqrt\backslash right)$, γ value is around 2. For less thick cells and in transmission, the relationship depends also on l * (the transport length).〔 〕 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「Diffusing-wave spectroscopy」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.