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Method and device for testing atmospheric ion mobility

An ion mobility and atmospheric ion technology, applied in the field of atmospheric ion mobility testing methods and devices, can solve problems such as the inability to obtain ion mobility, and achieve the effects of wide application range, avoidance of electromagnetic interference, and accurate results

Active Publication Date: 2016-07-27
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore (3) is not established, and the IEEE guideline (IEEEStd1227-1990 (R2010) method cannot obtain accurate ion mobility

Method used

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  • Method and device for testing atmospheric ion mobility
  • Method and device for testing atmospheric ion mobility
  • Method and device for testing atmospheric ion mobility

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1: as Figure 1~2 Shown, in order to realize the test of atmospheric ion mobility, the present invention is based on figure 1 The circuit diagram shown is designed as figure 2 A test device for atmospheric ion mobility shown is a cylindrical structure, and the test device includes: four insulating columns 1 and five layers of circular plates that are suspended on the four insulating columns 1 and are parallel to each other; The distance between the plates of the circular plate is adjustable; the five-layer circular plate is metal cover 2, corona coil 3, control plate 4, upper plate 5 and lower plate 6 from top to bottom; among them: metal cover The plate 2, the corona wire disc 3 and the control disc 4 constitute the ion flow source area, and the upper pole plate 5 and the lower pole plate 6 constitute the test area.

[0052] The metal cover plate 2 is used as a shielding plate, and the metal cover plate 2 and the control panel 4 jointly control the discha...

Embodiment 2

[0056] Embodiment 2: the purpose of the present invention is to propose a kind of method of accurately measuring atmospheric ion mobility, and its basic idea is as follows:

[0057] The invention is based on Figure 1-2 The ion mobility measurement setup shown in the experiment is carried out by a rotary voltmeter and an ion flow plate can measure figure 1 The electric field intensity E at the position z=d of the middle bottom plate (that is, the lower plate) d and ion current density J. Then, a set of electric field E on the upper plate can be established based on formula (1) and formula (2) 0 and the equations for ion mobility k:

[0058] E d = ( E 0 2 + 2 J d k ϵ ...

Embodiment 3

[0086] The present invention is as figure 2 In the shown ion mobility measuring device with a diameter of 1 m, a comparative test was carried out using the method of the present invention and the method of the IEEE standard, and the test results are shown in Table 1. According to Table 1, it can be seen that the ion mobility obtained by the method of the present invention is more stable than the original method.

[0087] Table 1. Negative ion mobility (d=0.099m, T=25.2℃, relative humidity ≈50%, air pressure 0.1003MPa)

[0088]

[0089]

[0090] The invention discloses a test method and device for atmospheric ion mobility, and its characteristics are: 1. Based on the test data, the ion mobility can be directly obtained by solving the equation strictly without using E 0 = 0 assumption, the result is more accurate. 2. The ion mobility can be obtained with only one set of test data, and there is no need to measure a large number of points in order to find a curve in which...

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Abstract

The invention discloses a method and device for testing atmospheric ion mobility.The method includes the steps that the distance d between an upper pole plate and a lower pole plate and ambient air pressure, temperature and relative humidity are determined; an equation set of the electrode field Ed of the lower pole plate and the voltage VT of the upper pole plate is determined, the equation set of Ed and VT is jointly solved to obtain ion mobility k, and the voltage of Vco and VA is adjusted so that a corona inception thin wire network can conduct corona discharge; VT is adjusted so that corona charges can reach the lower pole plate through the upper pole plate; the electric field intensity Ed and the ion current density J at the lower pole plate are measured; VT, Ed and J are substituted to an equation of the ion mobility k, and the ion mobility is obtained.According to the method and device for testing the atmospheric ion mobility, the ion mobility is obtained directly through strict equation solving, it is unnecessary to suppose that E0=0, and thus the result is more accurate; the ion mobility can be obtained just through a group of testing data, and it is unnecessary to measure a large number of points to find a curve with IT changing but the ion current density J of a testing region tending to be saturated.

Description

technical field [0001] The invention relates to the technical field of high electric discharge, in particular to a method and device for testing atmospheric ion mobility. Background technique [0002] Ion mobility is one of the essential characteristics of particles, which reflects the microscopic motion characteristics of particles, and can be used to distinguish particle types. In many fields of physics and chemistry, such as dielectric properties, dielectric conductivity analysis, microscopic electron motion, trace substance identification, explosives, drugs, atmospheric pollutant monitoring, chemical reaction process analysis, chemical reaction product detection, etc., ion mobility have important applications. As a universal basic parameter, it describes fundamental physical phenomena. The study of ionic mobility is not only of physical significance, but also of great engineering significance. Ion mobility is widely used in various electric field calculations. Any ele...

Claims

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Application Information

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IPC IPC(8): G01N27/62G01N27/622
CPCG01N27/622
Inventor 张波季一鸣王文倬何金良曾嵘陈水明胡军余占清庄池杰
Owner TSINGHUA UNIV
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