Ion mobility spectrometry detection system

Abstract

An ion mobility spectrometry detection system comprises an ion mobility detection device, a sample injection pipeline and a sample discharge pipeline, a circulating pipeline is arranged between the sample injection pipeline and the sample discharge pipeline, gas pressure in the circulating pipeline is higher than that in the sample injection pipeline, and part of detected gas discharged from a gas outlet of the detection device is mixed with to-be-detected sample gas led in by the sample injection device through the circulating pipeline. The ion mobility spectrometry detection system has the advantages that adverse effects of a negative-pressure suction device on the mobility direction the mobility distance of ions obtained by ionization in the prior art are avoided, so that detection accuracy and sensitivity of the an ion mobility detection device are improved; samples in the sample injection pipeline can be diluted by the circulating pipeline, and accordingly a detector cannot be contraindicated by the sample gas easily; moreover, pressure of the detector is increased obviously, and detection effect is improved.

Description

technical field [0001] The invention relates to a detection system, in particular to an ion mobility spectrum detection system. Background technique [0002] Ion Mobility Spectrometry (IMS for short), also known as Ion Mobility Spectrometry, is a new gas phase separation and detection technology that appeared in the early 1970s. It separates and qualifies ions based on the difference in ion drift time. With the help of a concept similar to chromatographic retention time, it was originally called plasma chromatography. The ion mobility spectrometer is usually divided into three main parts: the sample injection part connected to the external atmosphere; the migration tube for ion separation and ion detection; the detection device for acquiring, analyzing and displaying the spectrum. [0003] Ion mobility spectrometry is commonly used to sample and inject samples by air pump suction through a semi-permeable membrane. After the sample is brought into the ionization reaction ar...

AI Technical Summary

Problems solved by technology

[0008] For this reason, the technical problem to be solved by the present invention is that in the prior art, in order to make the sample gas reach the setting position, the ion mobility spectrometry detection device sets its working environment to work under the negative pressure state, but under the negative pressure state, the ionized The migration direction and migration distance of the ions will be deviated due to negative pressure, and the detection accuracy and sensitivity are poor, thereby providing an ion mobility spectrometry detection system with high detection accuracy and sensitivity

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