Sample introduction system used for ion-mobility spectrometry detector

Abstract

The invention relates to a sample introduction system used for an ion-mobility spectrometry detector. The sample introduction system includes a sample introduction shell; and the sample introduction shell is provided with a sample introduction capillary used for connecting the sample introduction system and an ion tube. Through the adoption of the sample introduction system, the pressure values ofan ion tube negative pressure zone, a sample gasification zone and external atmosphere are P2, P1 and P0, the relation of the ion tube negative pressure zone, the sample gasification zone and the external atmosphere is P2 < P1 < P0, and gas flow direction can be realized by the established pressure relation, so that the purpose of sample introduction can be achieved; the sample introduction capillary is the channel for introducing samples; and through the controlling of the size of the capillary and the difference value of the P2 and P1, the sample introduction speed and gas flow of the samples and the disturbance of the gas flow in the ion tube can be effectively controlled.

Description

technical field [0001] The present invention relates to the technical field of ion mobility spectrometry, in particular to the technical field of sampling systems, in particular to a sampling system for ion mobility spectrometry detectors. Background technique [0002] The ion mobility system is the core component of the ion mobility spectrometry detection instrument. The system mainly includes several functional blocks of sample injection, ionization, ion migration and ion collection. The sample injection system is at the forefront of the entire detection process. Gasification and sending into the ionization area, its core performance has two aspects: sample gasification speed and sample injection efficiency, here is for the sample collected is solid or liquid, the faster the gasification speed, the higher the instantaneous concentration of the sample, the more It is easy to be detected; on the other hand, the higher the sampling efficiency, the greater the probability of d...

AI Technical Summary

Problems solved by technology

[0003] The current sample introduction system basically adopts the heating method to realize the gasification of the sample, and there are various methods to send the gasified sample into the ionization area, such as the technology of using semi-permeable membrane permeation, and the method of using fan to generate ionization. Cyclone sampling, etc. The advantage of the semi-permeable membrane permeation sampling method is that it can isolate the external water and other impurities, and realize selective sampling. The disadvantage is that the sampling efficiency is low. The other cyclone sampling with a fan has advantages. It has high efficiency and large sample volume, but the disadvantage is that the sample gas flow and the gas flow in the transfer tube are greatly disturbed, which affects the movement of ions.

Images