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Double-sided pulse ionization investigation apparatus

A bidirectional pulse and detector technology, applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of anode sputtering consumption, cathode pollution, etc., and achieve the effects of avoiding performance degradation, reducing pollution, and strong corrosion resistance

Inactive Publication Date: 2008-04-09
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the problems of anode sputtering consumption and cathode pollution of existing detectors, the present invention proposes a novel bidirectional pulse ionization detector

Method used

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  • Double-sided pulse ionization investigation apparatus

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Effect test

Embodiment 1

[0019] As shown in Figure 1: high-purity helium (99.9995%) enters the discharge chamber (21) through the discharge gas inlet (1), and the single-chip microcomputer (A) controls the high-voltage power supply (B) to provide stable bidirectional power to the discharge electrodes (3a, 3b) Pulse high voltage, working frequency 20kHz, duty ratio 1:5, pulse width 25μs, period 200μs and pulse amplitude 1000V, the distance between the discharge electrodes is 1mm, helium is discharged in the discharge chamber to generate plasma, and the sample gas inlet ( 2) The incoming sample gas collides, and the sample gas and high-energy particles are ionized after colliding in the ionization chamber (22), and the single-chip microcomputer (A) controls the DC power supply (C) to plate the gold-plated collecting electrode (4a) on the copper surface, the polarized electrode ( 4b) Provide a 200V voltage to form an electric field between the electrodes, and the ions generated in the ionization chamber a...

Embodiment 2

[0021] As shown in Figure 1: high-purity helium (99.9995%) enters the discharge chamber (21) through the discharge gas inlet (1), and the single-chip microcomputer (A) controls the high-voltage power supply (B) to provide stable bidirectional power to the discharge electrodes (3a, 3b) Pulse high voltage, working frequency 20kHz, duty ratio 1:5, pulse width 10μs, period 100μs and pulse amplitude 600V, the distance between the discharge electrodes is 1mm, helium discharges in the discharge chamber to generate plasma, and the sample gas inlet ( 2) The incoming sample gas collides, and the sample gas and high-energy particles are ionized after colliding in the ionization chamber (22), and the single-chip microcomputer (A) controls the DC power supply (C) to plate the gold-plated collecting electrode (4a) on the copper surface, the polarized electrode ( 4b) Provide a 200V voltage to form an electric field between the electrodes, and the ions generated in the ionization chamber are c...

Embodiment 3

[0023] As shown in Figure 1: high-purity helium (99.9995%) enters the discharge chamber (21) through the discharge gas inlet (1), and the single-chip microcomputer (A) controls the high-voltage power supply (B) to provide stable bidirectional power to the discharge electrodes (3a, 3b) Pulse high voltage, working frequency 30kHz, duty ratio 1:4, pulse width 50μs, period 300μs and pulse amplitude 1200V, the distance between the discharge electrodes is 1mm, helium gas discharges in the discharge chamber to generate plasma, and the sample gas inlet ( 2) The incoming sample gas collides, and the sample gas and high-energy particles are ionized after colliding in the ionization chamber (22), and the single-chip microcomputer (A) controls the DC power supply (C) to gold-plate the collecting electrode (4a) on the copper surface, the polarizing electrode ( 4b) Provide 200V voltage to form an electric field between the electrodes, and the ions generated in the ionization chamber are coll...

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Abstract

The invention relates to a bidirectional pulse ionization detector. The bidirectional pulse ionization detector is a device used for defining the composition of a gas mixture. The device and the chromatograph are used together to analyze the composition of the sample gas. The detector comprises an integrated examination pond, a monolithic processor, a pair of discharge electrodes, a polarized electrode and a collecting electrode. A stable bidirectional pulse high-voltage power provides the pulse voltage for the discharge electrode. The monolithic processor controls the pulse width, cycle and pulse height of the monolithic processor. The polarized electrode and the collecting electrode produce an electric field under the control of a DC voltage, and collect the electron or ion in the electric field. A collected electric current outputs a voltage signal after the collected electric current is enlarged by an electrometer. The ionization detector is characterized by general utilization, high sensitivity, no radioactive source, non-destructiveness, no open flame, etc. The ionization detector has the widespread use.

Description

technical field [0001] The invention relates to a bidirectional pulse ionization detector, a device for determining the composition of a gas mixture, and the device can be used in combination with a chromatograph to analyze the composition of a sample gas. technical background [0002] Although the thermal conductivity detector (TCD) responds to all substances, its sensitivity is low; the flame ionization detector (FID) responds to almost all organic substances, but it cannot be used to analyze inorganic substances and permanent gases ; Helium ionization detector is the only universal detector that can detect to ng / g level. It responds to all inorganic and organic gases except neon. It is a non-destructive concentration detector, especially suitable for the analysis of permanent gases. Traditional helium ionization detectors all use radioactive sources (for example, see US4705947 and US4879472) or DC pulsed discharge sources (for example, see US5153519 and US5317271). Due t...

Claims

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Application Information

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IPC IPC(8): G01N30/64
Inventor 韩毓旺王天伟许坤许伟民
Owner NANJING UNIV OF TECH
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