液体非接触式快速安全检测

论文总字数：26456字

摘 要

易燃易爆危险液体的检测技术一直都在安检领域拥有着举足轻重的作用，其核心在于在不打开被检测容器的前提下快速准确地识别出被检测的液体是否为易燃易爆危险液体。目前最常见的用于易燃易爆危险液体的检测方法是让人们试喝所携带的液体或者采用价格十分高昂的断层层析液体检测仪等。这些方法的局限性是十分明显的，要么检测速度太慢且效果不好，要么可以检测的容器种类有限。也正是由于这样的现状，才给了不法分子可乘之机，带来了十分危险的隐患。本课题通过调研热导法的理论基础并基于其可检测范围广、操作难度小、成本低等优点，选择热导法来制作一款可用于非接触检测金属及非金属容器的易燃易爆危险液体检测仪。

本文首先阐述了课题的研究背景以及研究现状，指出本课题的目的和意义，并对现有的易燃易爆危险液体的检测方法进行对比分析，总结出它们各自的优势及劣势。其次，利用热导法结合超声波测距模块和红外测温传感器以及单片机和其他元件搭设了相关装置用于测定液体的导热系数。通过多组实验，获取到了不同液体（水、不同浓度酒精、食用油、丙酮）在不同容器（铁杯、陶瓷杯、硬塑料杯、饮料瓶）中的导热系数并找到相对应的阈值，用于在不同模式下的判断。最后本项目基于所得到的实验数据研究制作了相应的电路和代码。

关键词：危险液体检测，热导法，导热系数，非接触检测

ABSTRACT

As is well-known, flammable and explosive dangerous liquid detection is always playing a significant role in security check area. The core of the technology is that in unopen the container premise, the machine can quickly and accurately recognize whether the liquid is flammable and explosive dangerous. The mostly sued ways to detect liquid nowadays like drinking the liquid, expensive fault tomographic liquid detector have disadvantages. Because of this, many criminals have opportunities to make accidents.

The article firstly expounds the background and current research situation of this project and points out the meaning and target of this project. After comparing the existed way of detecting the flammable and explosive dangerous liquid, we summarized their advantages and disadvantages. What’s more, this project chose thermal conductivity method after researching the theoretical knowledge. With its advantages, we make a non-contact instrument to detect flammable and explosive dangerous liquid. The project made lots of experiments to obtain Thermal conductivities of different liquids(water, alcohol with different concentration, edible oil, acetone) in different container (iron cup, ceramics cup, hard plastic cup, beverage bottle) and found thresholds in different conditions. Finally, this project made dependent circuits and codes based on the data of experiments and achieved the preliminary detection of flammable and explosive liquids.

KEY WORDS: dangerous liquid detection, thermal conductivity method, thermal conductivity, non-contact detection

目 录

摘要···········································································Ⅰ

ABSTRACT····································································Ⅱ

第一章 绪论····································································1

1.1 易燃易爆危险液体检测研究现状·········································1

1.2 选题意义与研究目的···················································1

1.3 易燃易爆危险液体检测技术与方法·······································2

1.3.1 试纸法···························································2

1.3.2 介电常数法·······················································2

1.3.3 微波法···························································3

1.3.4 红外光谱法·······················································4

1.3.5 拉曼光谱法·······················································4

1.3.6 X射线断层技术法·················································5

1.3.7 核磁法···························································5

1.3.8 热导法···························································5

1.4 本文章节安排·························································5

1.5 本章小结·····························································6

第二章 检测理论基础及装置设计··················································7

2.1 检测理论分析·························································7

2.1.1 导热系数的定义以及导热定律·······································7

2.1.2 导热系数的测试方法和分类·········································7

2.2 检测装置设计·························································8

2.2.1 检测装置设计概述·················································8

2.2.2 检测装置硬件设计·················································8

2.2.3 检测装置软件设计················································11

2.3 本章小结····························································13

第三章 实验数据及分析·························································14

3.1 红外温度传感器位置的确定············································14

3.1.1 实验数据及分析··················································14

3.2 加热台加热时间的控制················································15

3.2.1 实验数据及分析··················································15

3.3 不同液体导热系数的测定··············································16

3.3.1 实验数据及分析··················································16

3.4 本章小结····························································18

第四章 总结与展望·····························································19

致谢··········································································20

参考文献······································································21

第一章 绪论

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