A power supply and detection method for ion mobility spectrometer single tube

Abstract

The invention discloses a power supply enabling an ion mobility spectrometry single tube to detect positive and negative ions at the same time and a detection method. On the premise of not changing the structure design of a traditional ion migration tube, a polarity conversion circuit is additionally arranged between a divider resistor and a high-voltage power source of a power supply unit of the ion migration tube, so that polarities of voltages at the highest end and the lowest end of the divider resistor are driven by control signals to be reverted, one or more times of polarity reversion are carried out in one time of analysis, positive ion mode detection is carried out under positive polarity, negative ion mode detection is carried out under negative polarity, and the positive and negative ion detection through the single tube is achieved. By means of the power supply and the detection method, on the premise of not changing the structure design of the traditional ion migration tube, the detection results of the positive and negative ions can be obtained at the same time after one time of analysis is completed.

Description

technical field [0001] The invention relates to an ion detection technology, in particular to the ion transfer tube technology. Background technique [0002] Ion mobility spectrometry (IMS) appeared in the late 1960s, and after decades of development, it has become a relatively mature on-site trace detection technology based on the molecular level. The core component of the ion mobility spectrometer is the ion transfer tube. In the ion transfer tube, the sample molecules can generate corresponding product ions under the action of the ionization source. When these product ions are placed in a constant electric field in the atmospheric environment, they are accelerated by the electric field and decelerated by the collision of neutral atmospheric molecules, and they appear to obtain a constant average velocity macroscopically. Since different product ions have different charge-to-mass ratios, spatial geometric configurations, and collision cross-sections, the average velociti...

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Problems solved by technology

The traditional ion mobility spectrometer can only work in one mode for one analysis, which brings some inconvenience to the application of the instrument in the field

[0012] The Chinese patent No. 200910265443.2 discloses a bipolar ion transfer tube. In order to fully reflect the positive and negative product ion information generated by the ionization of the analyte by the ion source at the same time, the structure of the ion transfer tube is modified. Very large changes make the structure of the ion transfer tube very complicated, which will greatly affect the stability and reliability of the ion transfer tube. In addition, its operation is also complicated and the cost will be greatly increased.

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