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Migration tube structure used for ion mobility spectrometer

A technology of ion mobility and transfer tube, which is applied in the parts of particle separator tubes, instruments, scientific instruments, etc., can solve the problems of ion loss and electric field being easily disturbed, so as to reduce input capacitance, reduce circuit noise, and improve The effect of ion transmission rate

Active Publication Date: 2009-07-01
NUCTECH CO LTD
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  • Abstract
  • Description
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Problems solved by technology

The electric field inside the transfer tube is easily disturbed, and the peripheral ions are scattered and lost due to the uneven electric field at the edge

Method used

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  • Migration tube structure used for ion mobility spectrometer
  • Migration tube structure used for ion mobility spectrometer
  • Migration tube structure used for ion mobility spectrometer

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Embodiment Construction

[0022] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components, although shown in different drawings. For clarity and conciseness, detailed descriptions of known functions and constructions incorporated herein will be omitted since they would otherwise obscure the subject matter of the present invention.

[0023] see figure 2 The electrode used in the transfer tube of the embodiment of the present invention is a mesh metal sheet with radian or taper, including the mesh radian or taper part 7 of the electrode sheet, and the metal wire in the dead zone is very thin. The center 8 of the electrode sheet is a round hole or a hole of other shapes, and the periphery 6 of the electrode is a metal structure 9 with a metal ring or other shapes such as a square tube on one or both sides. Electrodes close to the F...

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Abstract

The invention discloses a transfer tube structure for ion mobility spectrometers, comprising electrical pole pieces which are arranged at interval and an insulated portion, wherein, the electrical pole pieces are netted sheet metals with radians and tapers. In addition, the radian or taper portion of the electrical pole piece is provided with a mesh with higher transparency. Because of the above structure of the invention, an electric field which has evener focusing center on the periphery is to be formed on the transfer district portion, because of the toroidal structure of the electrode periphery, the influence of the extraneous electric field to the transfer electric field can be screened. Because the electrode is netted and has a circular hole in the middle, which focus and gather the ions which are not moved at the axial center as much as possible, and the ions which move toward the direction of axial center can be completely and transparently pass by.

Description

technical field [0001] The invention relates to a migration tube structure used in a detection device using ion migration technology to detect drugs and explosives, and belongs to the technical field of safety detection. 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. Ion mobility spectrometer usually consists of sample injection part, ionization part, ion gate or ion storage part, migration area, collection area, readout circuit, data acquisition and processing, control part and so on. [0003] In the prior art, in order to achieve higher ion transmittance, people focus on ion focusing technology. US Pat. No. 4,855,595 uses a time-varying electric field for focusing. US Patent No. 5,189,301 uses a cup-shaped electrode for focusing to increase the ion transmission rate. But many ions will scatter to the electrode and disappear. U.S. P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J49/02G01N27/64
CPCG01N27/622
Inventor 胡海峰李元景张清军陈志强
Owner NUCTECH CO LTD
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