氧化物null检测 | 3D光定位能在白色油漆中实现吗？-北京欧兰科技发展有限公司

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应用领域	石油/化工
检测样本	氧化物
检测项目
参考标准	暂无

利用德国LaVision公司门宽达到皮秒量级的超快门宽增强型CCD相机PicoStar研究二氧化钛微粒聚集体的局域化行为。

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When waves scatter multiple times in 3D random media, a disorder driven phase transition from
diffusion to localization may occur (Anderson 1958 Phys. Rev. 109 1492–505; Abrahams et al 1979
Phys. Rev. Lett. 42 673–6). In‘The question of classical localization: a theory of white paint?’ Anderson
suggested the possibility to observe light localization in TiO2 samples (Anderson 1985 Phil. Mag. B 52
505–9).We recently claimed the observation of localization effects measuring photon time of flight
(ToF) distributions (Störzer et al 2006 Phys. Rev. Lett. 96 063904) and evaluating transmission profiles
(TPs) (Sperling et al 2013 Nat. Photonics 7 48–52) in such TiO2 samples. Here we present a careful
study of the long time tail of ToF distributions and the long time behavior of the TP width for very thin
samples and different turbidities that questions the localization interpretation. Wefurther show new
data that allow an alternative consistent explanation of these previous data by a fluorescence process.
An adapted diffusion model including an appropriate exponential fluorescence decay accounts for the
shape of the ToF distributions and the TP width. These observations question whether the strong
localization regime can be reached with visible light scattering in polydisperse TiO2 samples, since the
disorder parameter can hardly be increased any further in such a ‘white paint’ material.

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