光离子化检测器的电离室结构设计与实验分析  

Structural Design and Experimental Analysis of Ionization Chamber for Photoionization Detector

作　　者：郑培超[1] 李海 刘星宇 朱思蒙 李志伟 王金梅[1] 毛雪峰 ZHENG Pei-chao;LI Hai;LIU Xing-yu;ZHU Si-meng;LI Zhi-wei;WANG Jin-mei;MAO Xue-feng(College of Optoelectronic Engineering,Chongqing University of Posts and Telecommunications,Chongqing Key Laboratory of Optoelectronic Information Sensing and Transmission Technology,Chongqing 400065,China)

机构地区：[1]重庆邮电大学光电工程学院光电信息感测与传输技术重庆重点实验室

出　　处：《仪表技术与传感器》2019年第12期35-39,48,共6页Instrument Technique and Sensor

基　　金：重庆市基础科学与前沿技术研究专项项目重点项目(cstc2015jcyjBX0016);重庆市基础科学与前沿技术研究专项项目一般项目(cstc2016jcyjA0389);重庆市留学人员回国创业创新支持计划(cx2017126);国家自然科学基金项目(61705028)

摘　　要：文中设计了光离子化检测器,利用Simion8.1软件进行了不同极板电压、极板间距以及载气入气口直径下的静电场仿真,在尽可能小的气室体积内设计出了结构更加优异的电离室,同时通过仿真分析降低了大量试验时间与成本。通过仿真与分析,得到了极板电压与带电粒子收集效率的关系,确定了175 V的极板电压以及收集板与极板间距为6 mm,入气口直径为6 mm。在系统实验阶段,对通入气体的流速做了优化,测试中气体流速为200 mL/min;对0~273 ppm的异丁烯气体进行检测,系统响应与气体浓度间成良好的线性关系,拟合优度为0.986 61,在不同时间段检测系统具有良好的稳定性和可重复性。A Photoionization Detector(PID)was designed.Simion8.1 was used to simulate the electrostatic field under different plate voltage,plate spacing and inlet diameter of carrier gas.The ionization chamber with better structure was designed as small as possible,and a lot of test time and cost were reduced through simulation analysis.The relationship between the plate voltage and the collection efficiency of charged particles was obtained through simulation and analysis,and the plate voltage of 175 V was determined.The spacing between the collecting plate and the plate was 6 mm and the inlet diameter was 6 mm.In the system experiment stage,the flow rate of the intake gas was optimized,and the flow rate was determined to be 200 mL/min.The isobutylene gas of 0~273 ppm was detected.The system response shows a good linear relationship with the gas concentration.The goodness of fit is 0.986 61.The detection system has good stability and repeatability in different time periods.

关 键 词：挥发性有机物 光离子化检测器 静电场仿真 电离室 

分 类 号：TQ050[化学工程]