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

A technology of ion mobility spectrometry and power supply, applied in the field of ion transfer tubes, can solve problems such as complex operation, affecting the stability and reliability of ion transfer tubes, complex structure of ion transfer tubes, etc., and achieve the effect of broad possibilities

CN103956316BActive Publication Date: 2016-05-18THE THIRD RES INST OF MIN OF PUBLIC SECURITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2016-05-18

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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.
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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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Embodiment Construction

[0036] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0037] The present invention reverses the polarity of the voltage loaded on the high and low ends of the voltage dividing resistor at least once during the single detection and analysis of the traditional ion mobility spectrometer single tube (hereinafter referred to as the ion mobility tube), so that the ion mobility spectrometer single tube can be analyzed in one time. It can alternately work in the positive and negative ion mode, thereby completing the simultaneous detection of positive and negative ions in a single analysis, so that the detection results of positive and negative ions can be given at the same time after a single analysis.

[0038]On the basis of this principle, on the premise of not changing the structural design of the tradit...