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(shí)間：4月11日19:00-20:30

地點(diǎn)：北校區(qū)西大樓205教室（教學(xué)區(qū)）

講座人介紹：

任寬芳本科畢業(yè)于陜西師范大學(xué)物理系，后在西安電子科技大學(xué)獲無(wú)線電物理理學(xué)碩士學(xué)位。后赴法國(guó)魯昂大學(xué)CORIA/UMR 6614研究所擔(dān)任訪問(wèn)學(xué)者，期間獲得博士學(xué)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(jí)教授。主要研究方向：激光束與規(guī)則形狀粒子相互作用的理論研究；小顆粒光學(xué)測(cè)量技術(shù)開(kāi)發(fā)及其在流體力學(xué)與燃燒學(xué)中的應(yīng)用；光束作用于粒子的輻射壓力與扭矩的理論預(yù)測(cè)；矢量復(fù)射線模型（VCRM）的開(kāi)發(fā)——用于描述任意形狀目標(biāo)的電磁/光散射問(wèn)題。在科學(xué)期刊發(fā)表論文110余篇，曾主持多項(xiàng)法國(guó)國(guó)家級(jí)項(xiàng)目。

講座內(nèi)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(xué)院