Dielectric barrier glow discharge ion source structure

Abstract

The invention discloses a dielectric barrier glow discharge ion source structure. According to the invention, metal wires are packaged in glass tubes and are not easy to oxidize; a double-coaxial structure is adopted, and the two glass tubes are parallel and are in close contact, so that the parallelism of metal wire electrodes and the consistency of spacing are ensured; and the medium between thetwo metal wires is only a thin glass tube wall, so that miniaturization is easy, the metal wires are not easy to oxidize, and the service life is long. The ion source is simple in structure, convenient to manufacture, small in size, not prone to oxidation, small in limit voltage value of a needed driving circuit and low in energy consumption.

Description

technical field [0001] The invention relates to the technical field of ion sources for detection instruments, in particular to a dielectric barrier glow discharge ion source structure, which can be widely used in portable substance detectors based on the principle of ion mobility spectroscopy. Background technique [0002] Common ion sources include: radioactive ionization, photo-induced and ultraviolet ionization, corona discharge, glow discharge, dielectric barrier discharge, etc. Radioactive ionization, such as Ni63, has high ionization energy level, long working time, and stable product ions, but it has the problem of radiation pollution, and it is troublesome to dispose of in the later stage; photoionization has high requirements for light-emitting devices, and the light-emitting devices used are large in size and long in service life It is short and the ionization energy is not high; corona discharge generally uses metal electrodes, but it is exposed in the ionized are...

AI Technical Summary

Problems solved by technology

Radioactive ionization, such as Ni63, has high ionization energy level, long working time, and stable product ions, but it has the problem of radiation pollution, and it is troublesome to dispose of in the later stage; photoionization has high requirements for light-emitting devices, and the light-emitting devices used are large in size and long in service life It is short and the ionization energy is not high; corona discharge generally uses metal electrodes, but it is exposed in the ionized area with strong oxidation, and its surface is easily oxidized, which affects its continuous discharge; traditional glow discharge is difficult to maintain under atmospheric pressure and dielectric barrier discharge has been widely used in ozone generation, pollutant treatment, material surface modification and cleaning, Lighting, thin film deposition and other large-scale industrial fields, demonstrating the maturity and market value of this technology

[0003] However, the existing dielectric barrier discharge ion source adopts a parallel or coaxial structure, and the structure size is large. The metal electrodes are generally exposed to the air and are easily corroded by the strong oxidizing gas ionized by the air.

At the same time, due to its large size and wide intervals between discharge electrodes, the ultimate discharge voltage required by the drive circuit is relatively high, resulting in a reduction in the life of key components of the drive circuit or requiring components with higher specifications, resulting in higher costs

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