论文总字数：24788字

摘 要

低温等离子体是一种新型分子活化技术，由于其独特的理化特性，在污染物治理、材料表面处理以及生物医学等领域均具有巨大的潜在应用价值。介质阻挡放电(dielectric barrier discharge DBD)是大气压下产生大面积低温等离子体的主要放电形式，其电极结构主要包含同轴式、板-板和针-板等形式，但这些DBD装置均属体积放电，无法实现对材料表面的灵活处理且不能满足在生物医学领域的需求。因此，本文设计了一种基于人体可接触的前提下采用悬浮电极的DBD装置，该装置可以对人体表面进行处理，具有消毒灭菌，促进伤口愈合以及保湿美容等功效。与其他类型产品相比，该产品不仅能够与人体接触而无任何不良反应，并且具有能量利用率高和普适性好的优点，在任意场合中都可以突破处理区域尺寸和外型的限制，灵活便捷地针对不同处理区域进行处理，最终可对人体表面进行处理。

本文是为了将低温等离子体应用到治疗人体皮肤、保护人体组织等的生物学中，并且人体能够无伤害的接触，从而设计了一种小型低温的等离子体皮肤处理装置，在该装置当中，绝缘层采用了聚四氟乙烯材料，实现了其在高频交流电压激励下的人体接触安全性与手持性，该装置在空气中放电产生低温等离子体，同时伴随有紫外光和辐照光子的生成，确保人体接触安全性的同时也利于对灭菌性能的提升。论文通过实验研究可得到设计装置的发光图像、电压电流波形、电压电荷Lissajous图形以及发射光谱特性并计算得出放电功率及传输电荷等，通过光谱谱线可以判断出所产生等离子体中含有的主要活性粒子。在本文第三章也研究了在不同调压器电压、气隙间距以及地电极结构情况下的电气特性和光谱特性，一定程度上优化了放电的工作条件。并且还建立了等效于该装置的电气模型，进行了最终的仿真以及理论分析。

本文实验结果表明，实验中所设计的装置灵活、安全、具有良好的绝缘性能并且人体可以安全的接触。放电方式为阻容性放电，所产生的粒子成分主要为高活性的含氧和含氮离子，主要粒子强度、放电功率和传输电荷等放电参数均随间隙距离减小和外加电压的增加而增加。将人体阻抗模型和传统DBD模型结合建立的悬浮电极结构DBD模型可以较为真实的反映放电电气特性，用其进行分析结果表明，当调压器电压在80V到135V之间且处理间距小于1.5mm时，流过人体的工作电流不超过6.44mA。

关键词：低温等离子体 悬浮电极介质阻挡放电 放电特性 人体接触安全性 电极结构

Design and characteristics of a small low temperature plasma skin treatment deVice

Abstrat

Low temperature plasma is a new molecular activation technology. Because of its unique physical and chemical properties, it has great potential application value in the fields of pollutant treatment, material surface treatment and biomedicine. Dielectric barrier discharge (DBD) is the main discharge form of producing large area of low temperature plasma under atmospheric pressure. Its electrode structure mainly includes coaxial, plate plate and needle plate. But these DBD devices are volume discharge, which can not achieve flexible treatment of material surface and can not meet the needs of biomedical field. Therefore, this paper designs a DBD device based on the premise that the human body can be contacted, which can be used to treat the human body surface, with the efficacy of disinfection and sterilization, promoting wound healing and moisturizing beauty. Compared with other types of products, this product can not only contact with human body without any adverse reactions, but also has the advantages of high energy utilization rate and good universality. In any occasion, it can break through the limitations of the size and shape of the treatment area, flexibly and conveniently treat different treatment areas, and finally treat the human body surface.

The purpose of this paper is to apply the low temperature plasma to the biology of treating human skin and protecting human tissue, and the human body can be contacted without any harm. Therefore, this kind of small low temperature plasma skin treatment device is designed. In this device, the insulating layer is made of polytetrafluoroethylene, which can be held by hand. The power supply of this device is high frequency and high voltage alternating current Source, in the air to produce a plasma, so that the human body can safely contact. In this paper, the luminescent image, voltage and current waveform, voltage and charge Lissajous figure and emission spectral characteristics of the designed device can be obtained by experimental research, and the discharge power and transmission charge can be calculated. The main active particles in the produced plasma can be determined by spectral lines. In the third chapter, the electrical and spectral characteristics of different voltage regulator, air gap and ground electrode structure are also studied, which optimizes the working conditions of the discharge to a certain extent. In addition, the electrical model equivalent to the device is established, and the final simulation and theoretical analysis are carried out.

The experimental results show that the device designed in the experiment is flexible, safe, has good insulation performance and the human body can contact safely. The discharge mode is capacitive discharge, and the particles are mainly composed of highly active oxygen and nitrogen ions. The discharge parameters such as the main particle strength, discharge power and transmission charge increase with the decrease of gap distance and the increase of applied voltage. The DBD model based on the combination of human body impedance model and traditional DBD model can truly reflect the electrical characteristics of the discharge. The analysis results show that when the voltage of the voltage regulator is between 80V and 135v and the processing distance is less than 1.5mm, the working current flowing through the human body does not exceed 6.44ma.

Key words: low temperature plasma；suspended electrode dielectric barrier ；discharge safety contactable；discharge characteristics；spectral characteristics

目录

Abstrat I

摘要 III

第一章 绪论 1

1.1低温等离子体研究背景及产生形式 1

1.1.1研究背景 1

1.1.2低温等离子体产生 1

1.2介质阻挡放电 3

1.3悬浮电极介质阻挡放电 5

1.3.1悬浮电极介质阻挡放电的原理 5

1.3.2悬浮电极介质阻挡放电常见电极结构 6

1.4等离子体在生物医学中的研究现状及存在的问题 6

1.5本文课题及主要研究内容 8

第二章 装置整体设计 14

2.1实验装置及实验平台搭建 14

2.2电源模块设计 17

2.3悬浮电极介质阻挡放电电极结构设计 18

2.4装置整体外壳设计与优化装箱 21

2.5本章小结 22

第三章 装置放电特性诊断与参数优化 25

3.1放电系统搭建与放电参数诊断 25

3.2不同电压幅值对装置放电特性的影响 26

3.2.1电气特性 26

3.2.2发光图像 31

3.2.3光谱特性 32

3.3不同气隙间距对装置放电特性的影响 35

3.3.1电气特性 35

3.3.2发光图像 39

3.3.3光图图像 41

3.4不同地电极结构对装置放电特性的影响 42

3.4.1电气特性 42

3.4.2发光图像 44

3.4.3光图图像 45

3.5本章小结 46

第四章 安全性分析 44

4.1装置运行稳定性与安全性分析 44

4.2人体接触安全性实验 46

4.3本章小结 46

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