Dielectric barrier discharge ionization detector

A technology of dielectric barrier and discharge ionization, which is applied in the field of gas chromatograph detectors, and can solve the problems of short distance between electrodes and high discharge voltage, etc.

Active Publication Date: 2018-03-16
SHIMADZU SEISAKUSHO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the dielectric barrier discharge used in BID is also related to parameters such as the material of the dielectric, the purity of the gas, the frequency of the discharge power supply, and the waveform of the power supply, it is difficult to predict the most suitable electrode configuration or discharge condition from the experimental rule, that is, Paschen's law. As can be seen, at least in argon-BID, the distance between the electrodes for plasma generation needs to be shorter than in helium-BID (or the discharge voltage should be increased)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] figure 1 It is a schematic configuration diagram of the argon-BID of the first embodiment (Example 1) of the present invention.

[0099] The argon-BID of this embodiment includes a dielectric cylindrical tube 111 through which a plasma generating gas flows. Hereinafter, for convenience of description, although the flow direction of the gas in the dielectric cylindrical tube 111 ( figure 1 In the direction indicated by the downward arrow in ), the upstream side is defined as up, and the downstream side is defined as the down direction, but the direction when argon-BID is used is not limited to this.

[0100] In addition, three annular electrodes made of a dielectric such as SUS or copper and spaced apart by a predetermined distance are provided around the outer wall surface of the dielectric cylindrical tube 111 along the flow direction of the gas.

[0101] Among the above-mentioned three electrodes, the central electrode 112 is connected to a high-voltage AC power s...

Embodiment 2

[0113] figure 2 , image 3 It is a partial enlarged view showing the structure of the discharge part of the argon-BID of the second example (Example 2) of the present invention. In addition, because the overall composition of the argon-BID in this embodiment is the same as figure 1 The shown configurations are the same, so descriptions are omitted.

[0114] The argon-BID of the present embodiment is provided with concavities and convexities on the inner wall surface of the dielectric cylindrical tube 211, so that the high-voltage electrode 212 and the charge collection part ( figure 1 120) and / or the high voltage electrode 212 and the front end part of the pipeline ( figure 1 The creeping discharge starting distance between 116) is shortened, and the other configurations are the same as in the first embodiment. In addition, the dielectric cylindrical tube 211 may be made of a dielectric material (quartz, sapphire, high-purity alumina) used in the conventional argon-BID...

Embodiment 3

[0128] while referring to Figure 5 A third example (Example 3) of the argon-BID of the present invention will be described. Figure 5 It is a schematic configuration diagram of the argon-BID of this embodiment.

[0129] The argon-BID of this embodiment is equipped with an external dielectric tube 411 , and a tube made of a dielectric material having an outer diameter of 7 mm and an inner diameter of 5 mm can be used as the external dielectric tube 411 . A ring-shaped electrode 412 made of metal (for example, SUS, copper, etc.) is provided around the outer peripheral surface of the outer dielectric tube 411 .

[0130] Attached to the upper portion of the outer dielectric tube 411 is a pipe front end member 416 having a cylindrical shape with an upper surface closed and a lower surface opened. A gas supply pipe 416 a is connected to the peripheral surface of the pipe front end member 416 . In addition, these piping front-end member 416 and gas supply pipe 416a are comprised ...

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Abstract

An Ar-BID capable of achieving a high level of SN ratio is provided. A dielectric barrier discharge ionization detector includes: a dielectric tube (111), a high-voltage electrode (112), an upstream-side ground electrode (113) and a downstream-side ground electrode (114). Plasma is generated through discharging in a discharging section (110), sample-gas components are ionized by the plasma, ion current is detected, and the dielectric tube (111) is made of a material whose resistivity is 1.0*10<13> [Omega]cm or lower. The upstream-side ground electrode (113) is longer than the beginning distance of creeping discharge between the high-voltage electrode (112) and a tube-line tip member (116) on the upper end of the dielectric tube (111); or the downstream-side ground electrode (114) is longerthan the beginning distance of creeping discharge between the high-voltage electrode (112) and the charge-collecting section, or the above two conditions are satisfied at the same time.

Description

technical field [0001] The present invention relates to a dielectric barrier discharge ionization detector, preferably primarily as a detector for gas chromatography (GC). Background technique [0002] In recent years, a dielectric barrier discharge ionization detector (Dielectric Barrier Discharge Ionization Detector, hereinafter abbreviated as "BID") utilizing ionization realized by a dielectric barrier discharge plasma has been practically used as a new detector for GC (refer to Patent Documents 1 and 2 and Non-Patent Document 1, etc.). [0003] The BID described in the above-mentioned document is roughly composed of a discharge part and a charge collection part provided therebelow. In the discharge part, by applying a low-frequency AC high voltage to the plasma generation electrode, the inert gas supplied to the pipeline of the dielectric tube is ionized to form atmospheric pressure non-equilibrium plasma. It is surrounded by a tube (dielectric tube) made of a dielectr...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G01N30/64G01N27/70
CPCG01N27/70G01N30/64G01N27/68G01N2030/025
Inventor品田惠
OwnerSHIMADZU SEISAKUSHO LTD