A high-field asymmetric waveform ion mobility spectrometer with a flat plate structure

Abstract

The invention relates to a flat-structured high field asymmetric waveform ion mobility spectrometer combination instrument. The instrument comprises a high field asymmetric waveform ion mobility tube.An ion source, a first separation zone, a second separation zone, a bias electrode and a weak current detection electrode are arranged inside the high field asymmetric waveform ion mobility tube. Thefirst separation zone is formed by a first ion separation electrode and a second ion separation electrode. The first ion separation electrode is connected with a pre-separation voltage source, and the second ion separation electrode is connected with a direct current voltage source. The second separation zone is formed by a third ion separation electrode and a fourth ion separation electrode. Thethird ion separation electrode is connected with a separation voltage source, and the fourth ion separation electrode is connected with a direct current scanning voltage source. The bias electrode isconnected with a bias voltage source, and the weak current detection electrode is connected with a weak current detector. According to the invention, needed separation voltage values are greatly reduced without sacrifice of detection sensitivity of a high field asymmetric waveform ion mobility spectrometer, and the detection precision is improved.

Description

technical field [0001] The invention relates to the field of ion mobility spectrometers, in particular to a high-field asymmetric waveform ion mobility spectrometer with a flat plate structure. Background technique [0002] The principle of high-field asymmetric waveform ion mobility spectrometry is based on the non-linear change of ion mobility of ions under the combined action of high and low electric fields to achieve high separation and identification of substances. This technology has a series of advantages such as simple structure, high ion utilization rate and continuous detection, and has been widely used in the fields of explosives, drugs and volatile organic compounds. This technology was first proposed by the former Soviet Union. Its structure is to use two parallel flat electrodes or a coaxial cylindrical structure (migration area) and an ion collection electrode. The sample enters the ionization area with the carrier gas and is ionized. The ionized sample ions ...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a high-field asymmetric waveform ion mobility spectrometer with a flat plate structure, which solves the problem of low sensitivity caused by large separation voltage value, large power module volume and complete separation voltage- Compensating for problems such as the difficulty in obtaining voltage spectra, providing a reliable technical solution for the application of high-field asymmetric waveform ion mobility spectrometry in the field under low electric field conditions

Images