微分动态显微镜：用显微镜探测波矢量相关的动力学
Differential Dynamic Microscopy: Probing wave vector dependent dynamics with a microscope
摘要：
我们演示了使用一个普通的白光显微镜的胶体分散体的Q依赖动力学的研究。用快速相机在亮场采集数字视频图像的时间序列，并将图像差异作为它们之间的时间延迟的函数进行傅立叶分析。这允许独立于它们是否可以单独解决的粒子动力学的表征。在很宽的波矢范围内测量了特征时间，发现其结果与粘性介质中布朗运动的理论预期值吻合得很好。
英文摘要：
We demonstrate the use of an ordinary white-light microscope for the study of the q-dependent dynamics of colloidal dispersions. Time series of digital video images are acquired in bright field with a fast camera and image differences are Fourier-analyzed as a function of the time delay between them. This allows for the characterization of the particle dynamics independent on whether they can be resolved individually or not. The characteristic times are measured in a wide range of wavevectors and the results are found to be in good agreement with the theoretically expected values for Brownian motion in a viscous medium.
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