基于有限元法的离子迁移谱电场数值模拟研究

传统线性离子迁移谱中漂移管电场的均匀性是离子迁移谱性能的主要影响因素之一。本研究利用COMSOL Multiphysics仿真平台，基于有限元法对线性漂移管的内电场进行数学物理建模及数值模拟分析，给出建模方法和均匀电场的标准，研究了电极厚度、绝缘环厚度、漂移管内径以及漂移管外部电场等因素对漂移管内电场的影响，旨在通过模拟结果优化离子迁移谱仪器设计，提高离子迁移谱的性能，为设计者提供参考。

Numerical Simulation of Electric Field for Ion Mobility Spectrometer Based on Finite Element Method

The homogeneity of electric field in the traditional drift tube is very critical to the performance of ion mobility spectrometry. In this study, numerical simulation of electric field in traditional drift tube was conducted by means of COMSOL Multiphysics software with finite element method. Additionally, modeling method and homogeneity standard for electric field were also presented. The influences of some important factors such as thickness of electrode and insulating ring, inner diameter of drift tube as well as metal enclosure of drift tube, on the homogeneity of electric field were researched. On the basis of the research, some useful laws were concluded. This paper is aimed at optimizing instrument design through the numerical simulation results, which can help designers to improve the performance of ion mobility spectrometry. Compared with the traditional research methods through experimental structure design, the simulation results can help shorten the instrument development cycles and save development costs.