报告人：Michel Versluis教授, University of Twente, The Netherlands 荷兰特文特大学
　　题目：High-speed optical imaging in fluids: ultrafast and ultrashort imaging techniques 流体高速光学成像：超快和超短成像技术
　　时间：2019-4-30下午2:00
　　地点：瞬态室(一号楼)会议室

　　报告摘要：High-speed imaging is in popular demand for a broad range of experiments in fluids. It allows for a detailed visualization of the event under study by acquiring a series of image frames captured at high temporal and spatial resolution. The challenge here is the combined microscopic length scales and ultrashort time scales associated with the mechanisms controlling fluid flow, and bubble and droplet dynamics. Ultra high-speed imaging at frame rates exceeding 10 million frames per second is briefly reviewed, including turbine-driven rotating mirror cameras and the emerging ultrafast sensor technologies. Here we also focus on ultrashort nanoseconds flash illumination techniques that shed new light on ultrafast processes in inkjet printing and in the fluid dynamical aspects of extreme ultraviolet (EUV) generation for state-of-the-art nanolithography.

　　High-speed imaging of inkjet printing using the illumination by the laser-induced fluorescence (iLIF) technique. The iLIF technique allows for incoherent speckle-free illumination for a duration of only a few nanoseconds (Selected by Nature Magazine as Image of the Year 2014).

　　报告人简介：Michel Versluis graduated with a degree in physics in 1988 from the University of Nijmegen, The Netherlands, with a special interest in molecular physics and astrophysics, working in the field of far-infrared laser spectroscopy of interstellar molecular species. Later, he specialized in the application of intense tunable ultraviolet lasers for flame diagnostics, resulting in a successful defense of his PhD thesis in 1992. After a two-year research position working on molecular dynamics at Griffith University, Brisbane, Australia, he continued to work on developing laser diagnostic techniques for internal combustion engines (Lund, Sweden) and industrial jet flames and solid rocket propellants (Delft, The Netherlands). Dr. Versluis is now full professor Physical and Medical Acoustics at the University of Twente, in the Physics of Fluids group. He is an expert in ultra high-speed imaging with a particular interest in the use of microbubbles and microdroplets for medical applications, both in imaging and in therapy, and in the physics and control of bubbles and droplets in microfluidic applications in medicine and the nanotechnology industry.