Measuring method and device for atmospheric ion mobility

An ion mobility and atmospheric ion technology, which is applied in the field of atmospheric ion mobility testing methods and devices, can solve problems such as inability to obtain ion mobility, and achieve the effects of wide range of use, prevention of peripheral discharge, and accurate results

Active Publication Date: 2018-05-15
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 (IEEE Std 1227-1990 (R2010) method cannot obtain accurate ion mobility

Method used

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  • Measuring method and device for atmospheric ion mobility
  • Measuring method and device for atmospheric ion mobility
  • Measuring method and device for atmospheric ion mobility

Examples

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]

[0059]

[0060] Where: the voltage V of the lower plate is determined based on the one-dimensional Poisson equation d for:

[0061]

[0062] Since the lower plate is grounded, V d = 0; formula (5) is obtained by transforming formula (6).

[0063] Solution (4) and (5) can directly get k:

[0064]

[0065] In the formula...

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 test method and device for atmospheric ion mobility, including: determining the distance d between the upper and lower pole plates and the surrounding air pressure, temperature and relative humidity; determining the electric field Ed of the lower pole plate and the voltage VT of the upper pole plate Equations, and jointly solve the equations of Ed and VT to obtain the ion mobility k, adjust the voltage of Vco and VA, so that corona discharge occurs in the fine wire net of corona; adjust VT to make the corona charge pass through the upper plate to the lower pole plate; measure the electric field intensity Ed and ion current density J at the lower plate; substitute VT, Ed, and J into the equation of ion mobility k to obtain ion mobility. The present invention directly obtains the ion mobility by strictly solving the equation without using the assumption of E0=0, and the result is more accurate; only one set of test data is needed to obtain the ion mobility, and there is no need to search for IT changes but the ion current density in the test area J tends to saturate the curve while measuring a large number of points.

Description

technical field [0001] The invention relates to the technical field of high electric discharge, in particular to a method and a 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 insulating medium properties, medium conductivity analysis, microscopic electronic movement, identification of trace substances, monitoring of explosives, drugs, and air pollutants, analysis of chemical reaction processes, detection of chemical reaction products, etc., ion mobility have important applications. As a universal basic parameter, it describes the basic physical phenomenon. Studying ion mobility not only has physical significance, but also has important engineering significance. Ion mobility is widely used in various electric field cal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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