方案摘要
方案下载应用领域 | 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。
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.
在一个双稳湍流涡旋火焰中,对间歇性动态的时间-频率定位
Particle-laden Taylor-Couette流:高阶转变和径向局部波浪涡旋的证据
7根杆束的流体-结构相互作用:用实验数据对比数值模拟
相关产品
汽车光学检测系统AIS
PT403型波长可调谐皮秒激光器
ANL系列高能量高重复频率DPSS纳秒激光器
APL4206 系列高能量皮秒激光放大器
UltraFlux FF/FT 5000 高能量可调谐飞秒激光器系统
UltraFlux FT300型波长可调谐飞秒激光器系统
Ekspla 超高功率激光器系统SYLOS 2A
LaVision PTUx 可编程时间控制单元
LaVision 用于粒子成像测速PIV的相机
LaVision StrainMaser 全场应变测试系统组件
LaVision 用于数字图像相关DIC的相机
LaVision StrainMaster 数字图像相关分析软件包
LaVision 标定板
LaVision StrainMaster 形变应变成像测量系统
LaVision StrainMaster DVC 体视全场应变测量系统
关注
拨打电话
留言咨询