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Corona discharge assembly and ion migration spectrometer including same

A technology of corona discharge and components, which is applied in the field of ion mobility spectrometer, can solve the problems of increasing the instability of corona ion source and the short life of single-needle corona ion source, so as to improve the service life, reduce loss, and electrode The effect of precise and stable position

Active Publication Date: 2015-07-01
NUCTECH CO LTD
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  • Abstract
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Problems solved by technology

[0004] The inventor realizes that if the corona discharge of multiple needles can be realized in turn, that is, at a certain moment, only the electric field strength at the tip of one needle can reach the corona discharge threshold, and the field strength at the tip of the other needles is low or zero. Solve the problem of instability of multi-needle simultaneous application of high-voltage corona ion source and short life of single-needle corona ion source

Method used

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  • Corona discharge assembly and ion migration spectrometer including same
  • Corona discharge assembly and ion migration spectrometer including same
  • Corona discharge assembly and ion migration spectrometer including same

Examples

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[0033] In this example, a specific design of a multi-needle turntable corona needle alternate discharge ion source assembly using a focusing structure is described. Such as Figure 3A The multi-needle structure of the focusing pole turntable with 6 corona needles is shown. The turntable 301 and the insulating sleeve 307 are made of polytetrafluoroethylene; the rotating shaft 304 is made of stainless steel; the corona needle mount 302 is made of oxygen-free copper, and a corona needle 303 is welded on it with high-temperature solder; The length protruding from the mounting seat is 3mm, the radius of the needle tip fillet is 0.05mm, and it is made of a metal platinum rod with a diameter of 0.5mm; the metal shielding cylinder 305 is made of stainless steel, and the edges at both ends are rounded to reduce the electric field on its surface Strength, to avoid discharge, the top angle of the horn is 125 degrees, the protruding corona needle 303 is located at the conical axis positi...

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Abstract

The present invention discloses a corona discharge assembly, including: an ionization discharge chamber, wherein the ionization discharge chamber includes a metal corona cylinder, and the metal corona cylinder is provided with an inlet of a gas to be analyzed and an annular piece-shaped port which forms a non-uniform electric field with corona pins and is provided with a circular hole at the middle; a rotating shaft is installed on the cylinder wall of the metal corona cylinder in an insulating manner, the rotating shaft is vertical to the axial line of the metal corona cylinder, and a turntable provided with multiple corona pins at the outer edge is installed at the end part of the rotating shaft the axial line of the metal corona cylinder passes in parallel through the rotation plane of the turntable. The present invention further discloses an ion mobility spectrometer using the above-mentioned corona discharge assembly.

Description

technical field [0001] The invention relates to the technical field of safety detection, in particular to an easy-to-manufacture multi-needle long-life corona discharge assembly and an ion mobility spectrometer using the assembly as an ionization source for detecting drugs and explosives. Background technique [0002] The ion mobility spectrometer realizes the resolution of ions according to the different drift speeds of different ions under a uniform weak electric field. It has the advantages of fast resolution, high sensitivity, no vacuum environment, and easy miniaturization, so it has been widely used in the detection of drugs and explosives. A typical ion mobility spectrometer usually consists of an injection part, an ionization part, an ion gate, a migration region, a collection region, a readout circuit, data acquisition and processing, and a control part. The main function of the ionization part is to convert the sample molecules into ions that can be migrated and s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J49/16H01T19/04G01N27/68
CPCH01T19/00G01N27/622H01J49/168
Inventor 张清军李元景陈志强王燕春赵自然刘以农刘耀红邹湘马秋峰王钧效常建平
Owner NUCTECH CO LTD
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