Wu Ruitao, Dogariu Aristide
CREOL, The College of Optics and Photonics, University of Central Florida, 4304 Scorpius Street, Orlando, Florida 32816, United States.
ACS Omega. 2022 May 24;7(22):18922-18929. doi: 10.1021/acsomega.2c01915. eCollection 2022 Jun 7.
When the properties of soft materials evolve in time, the simultaneous measurement of different characteristics is critical. Here, we demonstrate an experimental system that permits monitoring both the spatial and temporal evolution of the optical and mechanical properties. An integrated fiber-optic-based system allows determining the mechanical vibrations of structural elements over 5 orders of magnitude and over a broad frequency range. At the same time, the optical properties can be obtained within seconds from high-resolution measurements of the path-length distribution of reflected light. With proper cyclical scanning, the temporal evolution of the mesoscopic light scattering properties can be obtained in a depth-resolved manner. The performance of this integrated measurement is validated in the particular case of drying paint films. For these typical nonstationary media, we show how our approach provides unique access to the spatiotemporal material properties and how this information permits identifying the specific stages of structural evolution.
当软材料的特性随时间演变时，同时测量不同特性至关重要。在此，我们展示了一个实验系统，该系统能够监测光学和机械特性的空间和时间演变。一个基于集成光纤的系统能够确定结构元件在超过5个数量级的范围以及很宽频率范围内的机械振动。与此同时，通过对反射光程长分布的高分辨率测量，可在数秒内获得光学特性。通过适当的循环扫描，可以深度分辨的方式获得介观光散射特性的时间演变。这种集成测量的性能在干燥漆膜的特定情况下得到了验证。对于这些典型的非平稳介质，我们展示了我们的方法如何提供对时空材料特性的独特访问，以及这些信息如何允许识别结构演变的特定阶段。
