Three-dimensional dynamic light scattering
Three-dimensional dynamic light scattering
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DOI：
10.1080/09500349908231273
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发表时间：
1999-02-15
影响因子：
1.3
通讯作者：
Sinn, C
中科院分区：
文献类型：
--
作者：
Overbeck, E;Sinn, C
我们描述了采用一种新颖的光散射方案来消除强浑浊样品中多重散射的相关性。理论上已经提出的三维方案与商业上可用的两色设备相比显示出一定的优势。我们详细描述了我们的设置；特点是使用现代半导体激光二极管和现代单模光纤接收器。我们通过实验证明，通过我们的设置可以获得的最佳信噪比（或截距）beta(opt) = 0.20，可以根据测量的对准不确定性来定量计算。特别是，我们详细推导了影响信噪比的所有因素。我们研究了标称半径为 57.5 nm、固含量为 5% 的高浑浊聚苯乙烯乳胶样品，以清楚地证明互相关函数的测量结果，而不会因多重散射而失真。 790 nm 处的浊度为 3 mm(-1)，这是迄今为止通过动态光散射研究的最浑浊的样品。
We describe the employment of a novel light-scattering scheme for the decorrelation of multiple scattering in strongly turbid samples. The three-dimensional scheme, which has been proposed already theoretically, shows certain advantages compared with the two-colour apparatus, which is commercially available. We describe our set-up in detail; features are the use of modern semiconductor laser diodes and contemporary single-mode fibre receivers. We show experimentally that the optimal signal-to-noise ratio (or intercept) beta(opt) = 0.20, which is obtainable with our set-up, can be quantitatively calculated from the measured uncertainties in the alignment. In particular, we give a detailed derivation of all factors influencing the signal-to-noise ratio. We investigate a highly turbid polystyrene latex sample with a nominal radius of 57.5 nm and 5% solid content, to demonstrate clearly measurements of the cross correlation function without distortions due to multiple scattering. With its turbidity of 3 mm(-1) at 790 nm this represents the most turbid sample which has been investigated by dynamic light scattering to date.