講座名稱：Extinction Spectroscopy for Particle Sizing: Fundamental Principles, Key Technologies, and Applications

講座人：任寬芳 教授

講座時間：4月11日19:00-20:30

地點：北校區西大樓205教室（教學區）

講座人介紹：

任寬芳本科畢業于陜西師范大學物理系，后在西安電子科技大學獲無線電物理理學碩士學位。后赴法國魯昂大學CORIA/UMR 6614研究所擔任訪問學者，期間獲得博士學位并留任研究員。1998年獲聘終身職位副教授，2008年晉升為教授，2015年晉升為一級教授。主要研究方向：激光束與規則形狀粒子相互作用的理論研究；小顆粒光學測量技術開發及其在流體力學與燃燒學中的應用；光束作用于粒子的輻射壓力與扭矩的理論預測；矢量復射線模型（VCRM）的開發——用于描述任意形狀目標的電磁/光散射問題。在科學期刊發表論文110余篇，曾主持多項法國國家級項目。

講座內容：

Extinction spectroscopy for particle sizing is based on the analysis of wavelength-dependent light attenuation to determine particle size distributions. It is, in principle, a simple technique. Prior to the advent of CCD-based spectroscopes, this technique had already established utility across multiple fields. Thanks to the development of the CCD-based spectroscope and computer science, it has experienced significant progress, and become widely used in many fields, such as measurement of web steam in power plants, automotive exhaust analysis, atmospheric dust monitoring, etc. However, the technique’s reliability depends on two critical factors: (1) optimized optical configuration (e.g., wavelength selection, size and position of the detector …) and (2) robust inversion algorithms to solve the inherently ill-posed PSD retrieval problem. This talk will share the experience in the development of (i) an advanced inversion algorithm employing adaptive regularization and multi-wavelength calibration to handle complex, polydisperse systems; (ii) a user-friendly software package featuring real-time processing and automated quality control; and (iii) field-tested measurement systems validated for industrial environments, such as turbine steam quality control and diesel particulate emissions testing.

主辦單位：物理學院