Cylindrical non-symmetric field ion migration tube

Abstract

The invention relates to a cylindrical non-symmetric field ion migration tube. A cylindrical inner electrode, a cylinder middle electrode and a cylinder outer electrode are penetrated and sheathed into a body from inside to outside and keep coaxial. The cylinder middle electrode is connected with a high-voltage radio-frequency power supply by a conducting wire, and the cylindrical inner electrode is connected with the cylinder outer electrode by a conducting wire. The outer side of one end of the cylinder middle electrode is provided with an ionization source and a sample gas inlet, and the other end of the cylinder middle electrode is provided with a gas outlet. The end part of the gas outlet near the cylindrical inner electrode is provided with an annular inner detector, and the end part of the gas outlet near the cylinder outer electrode is provided with an annular outer detector. The invention can overcome the defect of the traditional coaxial cylindrical migration tube, namely the invention can detect a variety of ions with an electric field dependence migration rate. In addition, the migration tube has the characteristics of simple structure, high utilization ratio of ions, and the like, and can realize continuous uninterrupted detection.

Description

technical field [0001] The invention relates to an ion transfer tube, in particular to a novel cylindrical asymmetric field ion transfer tube. The outstanding feature of this transfer tube is that it can make up for the shortcomings of traditional asymmetric field transfer tubes, that is, it can simultaneously detect various ions with electric field-dependent mobility without changing the polarity of the electric field. In addition, the migration tube of the present invention has the characteristics of simple structure, high utilization rate of ions, etc., and can realize continuous and uninterrupted detection. Background technique [0002] Ion mobility spectrometry is a separation and analysis technique based on ion mobility. At present, it is widely used in airport security inspection, anti-terrorism explosive detection, drug and precursor chemical detection, biochemical warfare agent detection and other fields, and the scope of application is still expanding. Ion mobili...

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Problems solved by technology

This greatly affects the flexibility and detection range of this structure application, and brings technical difficulties: if the polarity of the electric field is switched, it means that the power supply design requirements are improved and the above two ions cannot be detected synchronously.

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