颗粒物环境下用于气体吸收光谱测量的气固两相高温样品池系统  

A Gas-Solid Two-Phase Optical Sample Cell System for Detecting Gas Absorption Spectra at High Temperature in Particulate Environment

作　　者：周晴 高振威 高光珍 张铭珂 刘庆辉 陈艺鹏 蔡廷栋 Zhou Qing;Gao Zhenwei;Gao Guangzhen;Zhang Mingke;Liu Qinghui;Chen Yipeng;Cai Tingdong(School of Physics and Electronic Engineering,Jiangsu Normal University,Xuzhou 221116,Jiangsu,China)

机构地区：[1]江苏师范大学物理与电子工程学院,江苏徐州221116

出　　处：《光学学报》2023年第3期228-234,共7页Acta Optica Sinica

基　　金：国家自然科学基金(62275110,42275136,61875079,61805110,61475068,11104237);江苏省重点研发计划(社会发展)专项(BE2021634);江苏省碳达峰碳中和科技创新专项(BE2022314);徐州市推动科技创新项目重点研发计划(KC19202);江苏师范大学大学生实践创新训练计划(202010320122Y,202110320012Z)。

摘　　要：设计了一种气固两相高温光学样品池,模拟同时存在颗粒物的气体探测环境,并通过搭建可调谐二极管激光吸收光谱测量系统,对颗粒物环境下的温度与乙炔体积分数测量技术进行研究。使用质量流量计配置体积分数为0.1%~1%的乙炔气体,并设计颗粒物播撒装置,将直径为125μm的石英砂颗粒与不同体积分数的乙炔气体混合通入样品池,在样品池外侧设置纤维加热腔进行温度控制,产生不同温度的样品环境。使用中心波长为1540 nm的DFB激光器,通过对6489.07 cm^(-1)与6490.02 cm^(-1)位置处的一对乙炔吸收谱线进行同时探测,实现了对温度与乙炔体积分数的同时测量。分析发现,500~1000 K温度范围内的温度测量一致性R2≈0.998,相对平均标准偏差为3.05%,乙炔体积分数测量一致性R2≈0.995,相对平均标准偏差为2.65%。此系统满足颗粒物环境下气体光谱探测研究的需求,可为气固两相环境下的光谱探测技术研究提供参考。Objective In the past 40 years,tunable diode laser absorption spectroscopy has developed into a remarkable optical diagnostic technique because it can provide a reliable,fast,timeresolved,sensitive,nonintrusive in situ measurement for various gas parameters,such as concentration,temperature,pressure,velocity,mass flux,and density.Hence,it has been widely used in many fields including environmental monitoring,combustion diagnosis,industrial process control,and biomedical sensing.In some special applications,there is not only gas but also some particles and liquid droplets in the measurement area,such as the soot in the flow field of combustion and fine particles(PM2.5 and PM10)in the atmospheric air.Then the variation in the intensity of the tunable diode laser is induced by both the absorption of the target gas molecule and the extinction/scattering caused by particles and liquid droplets.Thus,how to extract the absorption spectrum of the target absorption line of the measured gas molecule from the mixed signal is significant for the development of gas sensors based on tunable diode laser absorption spectroscopy.Here we design a gassolid twophase optical sample cell and apply it to simulate a gas detection environment in the presence of both particulate matter and gas.Temperature and acetylene content are measured in the gassolid twophase optical sample cell,which can demonstrate how to detect gas in a particulate environment.Methods The gassolid twophase optical sample cell used in the experiment is made of stainless steel and located in a ceramic fiber furnace whose temperature is controlled by a custommade temperature control system.The heated static cell has a height of 290 mm and a diameter of 120 mm.The JGS3 quartz rods with a length of 90 mm and a diameter of 52 mm are inserted into the cell,and each quartz rod has an inclination of 1.5o against the vertical direction to further reduce interference fringe noise.The temperature in the sample cell is measured by three Ktype thermocouples with accuracies of±

关 键 词：光谱学 吸收光谱 消光光谱 样品池 气固两相 气体探测 

分 类 号：O433.1[机械工程—光学工程]