IMS型挥发性有机物检测装置的研制：离子分布的模拟与比较
Development of an IMS Type Device for Volatile Organic Compunds Detection: Simulation and Comparision of the Ion Distributions
摘要：
离子迁移谱（IMS）是一种众所周知的、灵敏和快速的检测危险有机化合物的技术。我们提出了一个系统，其中冠型放电产生的离子流是扫向收集器的横向电场的阵列。离子在进入电池时根据其迁移率被分离。因此，沉积在检测器组件处的电荷的分布构成每种有机化合物的{ \em指纹}。模拟我们的细胞和实验进行了少量的丙酮，乙醇和甲苯。分析了电流和电荷随飞行时间的变化对电池参数的依赖性。我们的模拟仅定性地再现了实验结果。然而，PCA的统计分析所得到的结果，通过模拟所提出的设计表明，指纹是有用的一个明确的识别这些化合物。
英文摘要：
Ion Mobility Spectrometry (IMS) is a well-known, sensitive and rapid technique to detect dangerous organic compounds. We propose a system in which a crown type discharge generates a ionic flow that is swept towards an array of collectors by a transverse electric field. The ions are separated as they enter the cell according to their mobility. Thus, the distribution of the charge deposited at the detector assembly constitutes a {\em fingerprint} for each organic compound. Simulations of our cell and experiments were performed for small amounts of acetone, ethanol and toluene. The dependence on the cell parameters of the current and charge versus time of flight was analyzed. Our simulation reproduces only qualitatively the experimental results. However, a PCA statistical analysis of the results obtained by simulation of the proposed design shows that the fingerprint is useful for a clear identification of such compounds.
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