# 便携式空气负离子浓度检测仪结构设计 Design of Portable Air Negative Ion Concentration Detector

Abstract: The air anion concentration can be measured by an air anion concentration detector. The detector measures the concentration of negative ions by converting the amount of charge of negative ions in the air into current, and then converting the current into the concentration of negative ions in the air. The existing portable air negative ion concentration detector has a small measuring range and low accuracy. In view of this, this paper designs a new type of portable air anion concentration detector. The detection channel is designed in an “L” shape, and the anion receiving structure is designed in a thin rod shape. The “L” shape design is convenient to install a fixed exhaust fan, and the actual operation is convenient; the receiving structure is designed in a thin rod shape, the air flow can be larger, and the detection data is more accurate. The air anion concentration detector designed in this paper can be used in both high and low concentration anion environments, with a wide measurement range, up to 0~200 million ions/cm
3, high accuracy, and real-time detection.

1. 引言

2. 检测原理

$N=\frac{I}{eM}$ (1)

I：离子收集器的输出电流(A)；

M：离子收集器的体积流量(cm3/s)，即空气流速与收集器有效横截面积的乘积；

q：离子带电量(C)；

N：空气负离子浓度(ions/cm3)。

3. 实验过程

3.1. 检测仪结构

Figure 1. Shell of new negative ion concentration detector

3.2. 检测过程

Figure 2. Internal structure of negative ion concentration detector

Figure 3. The movement direction of negative ions in the collector

4. 负离子检测设备对比

Figure 4. Parallel plate detection channel structure

Figure 5. Structure of double cylinder shaft detection channel

5. 结果与讨论

[1] 马云慧. 空气负离子应用研究新进展[J]. 宝鸡文理学院学报(自然科学版), 2010, 30(1): 42-51, 64.

[2] 尹淑娴, 朱达洪, 陈玲, 等. 东莞市植物园空气负离子浓度变化特征[J]. 气象水文海洋仪器, 2012, 29(2): 33-36.

[3] 韩佳佳, 陶宗明, 张辉. 一种基于迁移率分析的空气负离子浓度检测方法[J]. 气象科技, 2019, 47(5): 747.

[4] 周慧萍. 空气负氧离子浓度检测方法及其系统设计[D]: [硕士学位论文]. 南京: 南京信息工程大学, 2016.

[5] Paril, V.N., Patil, B.P., Shimpi, N.D., et al. (2013) Programmable Ion Counter. IEEE Science & Information Conference, London, 7-9 October 2013, 685-688.

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