为了改进离子门的驱动方式, 简化离子门驱动电源设计和提高离子迁移谱分辨率, 通过增加一组电阻实现离子门两端的不对称供电, 再对低电压端的电压进行控制实现离子门功能。 分析了该方式下的两种情况对迁移管内的电场、 离子迁移谱的分辨率和信噪比的影响。 借助SIMION7.0对离子门两边的电场分布进行了模拟和比较, 并应用数值化拉普拉斯方程的方法计算了迁移管轴线的电场数据。 实验证明: 相比常规迁移谱的离子门浮地驱动电源, 这种驱动方法成本低, 离子门电源的设计简单, 能够明显提高离子迁移谱的分辨率。 该方法能够应用于离子迁移谱的测量仪器或实验设备。

In order to change the driving mode of ion shutter, simplify the design of ion shutter driving power and improve the resolution of ion mobility spectrometry, a series of resistors were added to achieve asymmetric power supply of ion shutter, and the low voltage part was controlled to realize the function of ion shutter. Two conditions in this mode, the effect of electric field in drift tube and the resolution and signal-to-noise ratio of ion mobility spectrum were analyzed. Aided by SIMION 7.0, the electric field distribution at both sides of ion shutter was simulated and compared. Electric field data of drift tube axis was calculated through the method of numerical solution of Laplace equation. Experiment has proved that: compared with floating ground driving power used in conventional ion mobility spectrometry, the driving mode was low cost, and the design of ion shutter driving power supply was simple, and the resolution of ion mobility spectrometry was enhanced significantly. The method can be used in measurement instrument or experimental device of ion mobility spectrometry.