Ion mobility spectrometer and method for controlling ion gate by using alternating current superposition method

Abstract

The invention relates to an ion mobility spectrometer and method for controlling an ion gate by using an alternating current superposition method. The alternating current superposition method is adopted, and a set of series resistance circuit is added and is connected to one end of the ion gate. When no pulse signal is input, the size of resistance value of a potentiometer in the series resistance circuit is adjusted, and the potential difference between two sets of metal wires of the ion gate is changed, so that the potential difference between the metal wires is large enough, the ion gate is completely closed to prevent ions from entering a migration zone from a reaction zone; when a pulse signal is input, the potential and polarity of the pulse signal enable the voltage between the two sets of metal wires of the ion gate to be equal, the ion gate is opened, the ions can penetrate through the ion gate to reach the migration zone to be detected by an ion signal detector. The control way can effectively achieve the function of the ion mobility spectrometer. The device cost of the ion mobility spectrometer is reduced, the resolution ratio or the signal to noise ratio of the ion mobility spectrometer can be increased, and the functions of the ion mobility spectrometer are enriched.

Description

technical field [0001] The invention belongs to the field of analytical instruments and detection, and in particular relates to an ion mobility spectrometer and a method for controlling ion gates by means of alternating current superposition. Background technique [0002] The ion gate is one of the core components of the ion mobility spectrometer. By controlling the switch of the ion gate, the ions in the reaction area of ​​the transfer tube can enter the transfer area periodically and be detected by the detector after being separated. [0003] In a commonly used ion mobility spectrometer, the control mode of the ion gate is as follows: figure 1 As shown in Fig. 1, the pulse signal is amplified by the driving power supply and is directly superimposed on the migration electric field at the plane where the ion gate is located. The amplified pulse voltage is a floating voltage, that is, this voltage cannot be referenced by the acceleration electric field of the migration tube....

AI Technical Summary

Problems solved by technology

[0004] Problems solved by the technology of the present invention: overcome the high cost and complex circuit of the floating ion gate pulse power supply in the existing ion mobility spectrometer, and provide an ion mobility spectrometer and method using the AC superposition method to control the ion gate. The superposition method controls the ion gate, and the high-voltage pulse power supply of the ion gate does not need floating isolation, which reduces the device cost of the ion mobility spectrometer

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