Method and device for detection and identification of gases

A gas and molecular technology, applied in the field of gas identification, which can solve the problems of complex technology, long measurement time, and inability to immediately detect the chemical mixture to be tested.

Active Publication Date: 2013-03-13
AIRSENSE ANALYTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0034] The disadvantage is that this combination of DMS and classic Flugzeit-IMS is technically very complicated, especially for the latter embodiment, two classic Flugzeit-IMS and one DMS have to be configured and combined
In addition, the measurement time is too long to detect the chemical mixture to be tested immediately, because the DMS as the first separation system needs at least a compensation voltage, which takes seconds to minutes

Method used

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  • Method and device for detection and identification of gases
  • Method and device for detection and identification of gases
  • Method and device for detection and identification of gases

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Embodiment Construction

[0076] like figure 1 As shown, the new device for identifying gases in the embodiment includes a drift tube 1, one end of which is connected to an intake system 2, and the other end is connected to a detector 3, and its structure is a flat conductive disc.

[0077] In the drift tube 1 there is an electromotive switching network 4 , by means of which the interior space in the drift tube 1 is divided into a reaction zone 5 and a drift zone 6 . The reaction zone 5 is connected to the intake system 2 , and the drift zone 6 is connected to the detector 3 . In addition, an ion source 7 is arranged near the intake system 2 in the reaction zone 5, and a shielding grid 8 is arranged in the drift zone 6, and the shielding grid 8 is located in front of the detector 3, wherein the ion source 7 is covered with a radioactive Ni63 foil, shield grid 8 is used to provide capacitive decoupling. The switching grid 4 is called Bradbury-Nielsen grid, which is composed of two conductive metal com...

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Abstract

It is an object of the invention to develop a generic method for identification of gases and a corresponding device, which has a simple structure and allows immediate and simultaneous detection of the chemical compounds to be tested, and which uses for identification the material-specific mobility and simultaneously the change in this mobility as a function of the electric field strength. This is achieved in that due to the resulting electric field, each ionized molecule has a drift velocity which is partially increased or decreased, wherein the resulting electric field is a DC field, on which an asymmetric AC field is superimposed. These methods and associated devices for the detection and identification of gases are used to identify and detect chemical compounds, in particular explosive and / or unhealthy substances or compounds, which must be detected in very small concentrations.

Description

technical field [0001] The invention relates to a method for discriminating gases according to the preamble of claim 1 and a related device according to the preamble of claim 11 . [0002] The described method and associated apparatus for the detection and identification of gases are useful for the detection and identification of chemical compounds, especially explosive and / or toxic substances or mixtures of substances at very low concentrations. Background technique [0003] For the detection and identification of explosive and / or toxic compounds, detection methods in the ppt-ppb range are required. To detect and confirm these chemicals, spectrometers are usually used. Ion Mobility Spectrometer (IMS, Ion Mobility Spectrometer) is commonly used, also known as plasma chromatography, because unlike other spectrometers such as mass spectrometers, a vacuum pump is required for the detection of produced chemical substances or compounds. Therefore, IMSs are superior to other spe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/64H01J49/40
CPCG01N27/624G01N27/622H01J49/0031H01J49/0027
Inventor W·明赫迈尔B·翁格蒂姆A·瓦尔特
Owner AIRSENSE ANALYTICS
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