力学系与湍流与复杂系统国家重点实验室学术报告（报告人：Prof. Zhili Zhang ）
发布时间: 2009-07-07 05:03:00
SEMINAR SERIES
北京大学工学院 
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力学与空天技术系
湍流与复杂系统国家重点实验室
题目：Coherent Microwave Scattering from Laser-induced Plasma关联微波散射
报告人 Prof. Zhili Zhang （张志利）
Mechanical, Aerospace & Biomedical Engineering, University of Tennessee
报告内容摘要：
Modern aerospace applications require accurate measurement and precise control of flow properties. A novel laser diagnostic technique: coherent microwave Rayleigh scattering from resonance enhanced multiphoton ionization (REMPI), Radar REMPI, was demonstrated experimentally and theoretically. The technique combines high sensitivity of microwave detection and extreme selectivity of nonlinear optical process. Physics of coherent microwave scattering and REMPI will be discussed first. Coherent microwave Rayleigh scattering guarantees direct relation between the scattering signal and total electron number inside the plasma. REMPI achieves highly selective generation of electrons for different species. The unique time-accurate in-situ and remote sensing nature of Radar REMPI is attractive to numerous applications. The nanosecond response of the excitation and detection makes Radar REMPI robust to quenching and useful for the reacting environment. Localized measurement and remote sensing capability are important to sensitive detection of critical apparatus. Here trace species detection, rotational temperature measurement and weakly ionized plasma amplification will be discussed.
报告人简介：
Prof. Zhili Zhang received his Ph. D. and Master degree of applied physics in Mechanical and Aerospace Engineering from Princeton University in 2008 and 2006 respectively. His Bachelor degree is in Precision Instrumentation from Tsinghua University in 2000. He joined the University of Tennessee in September 2008, and has established the Advanced Laser Diagnostics Laboratory. His research interests lie in optical diagnostics, laser applications in turbulent flows, nanophotonics and its biomedical applications. He is the co-inventor of novel Radar REMPI (coherent microwave diagnostics of Resonance Enhanced MultiPhoton Ionization) technique. His papers have been published in prestigious peer reviewed journals, such as Physical Review Letters, Journal of Applied Physics and AIAA Journal etc.
主持人：陈正 特聘研究员
时 间：7月16日（周四）下午2:00
地 点：力学楼434会议室
欢迎校内外师生光临！
联系人：陈正 13439589987