传感技术学报2018，Vol.31Issue(3)：323-328,6.DOI:10.3969/j.issn.1004-1699.2018.03.001
光离子化检测器的电离室结构优化与实验研究
The Experimental Study and Structural Optimization of Ion Chamber in Photo-Ionization Detector
摘要
Abstract
The simulation of gas flow field and electrostatic field in the Photo Ionization Detector by COMSOL was conducted in the present study based on principle investigation,and by the results of which to achieve the target of structural optimization so as to have the dead volume significantly reduced,and finally the relationship between offset voltage and collection efficiency was obtained. Which led to a remarkable increase of collection efficiency by the charged ions in the Photo Ionization Detector. And an ionization chamber with both low interference and fast re-sponse was then developed. Then experiment performed with toluene as a VOCs gas under the condition of optimal gas flow rate of 50 mL,ionization energy of 10.86 eV of the UV lamp,and the results showed that,in the case of off-set voltage of 150 V,the ion collection efficiency reached 85%,moreover,a preferable linearity of 99.84% of the Photo Ionization Detector was obtained,and the a ppb level of LOD can be achieved. The determination results well fitted the relationship between offset voltage and the response value obtained in the simulation.关键词
光电检测/低浓度气体检测/光离子化/紫外灯光源/VOC气体Key words
Photoelectric detection/Photo Ionization/gaseous detection/UV lamp/VOCs分类
化学化工引用本文复制引用
周琪,张思祥,张旭,周围,李俊成,赵业佳..光离子化检测器的电离室结构优化与实验研究[J].传感技术学报,2018,31(3):323-328,6.基金项目
国家重大科学仪器设备开发项目基金(2012YQ060165) （2012YQ060165）
