摘要人员众多的公共场所和一些重要的工作和生产单位，通常是恐怖事件及安全问题频发的地点，因此公共安全问题越来越受到各国的重视。提高安全检测系统的有效性和精确性是解决公共安全问题的有效途径之一，毫米波被动安检系统作为新一代的安检设备，弥补了早期用于公共安全检测的金属安检门、X射线检测仪和红外探测仪存在的不足。

毫米波可以全天候全天时地工作，且穿透力强、精度高，对人体和其他物品没有损害。本文对基于毫米波被动成像技术的安检系统进行了研究。本文综述了毫米波被动成像的发展背景、意义及其应用，概述了毫米波成像的基本原理，分析了人体隐匿物品的毫米波辐射特性和被动毫米波成像系统的工作原理，并采用3mm波段交流全功率辐射计组成的被动毫米波成像系统，通过试验对毫米波辐射图像特征进行了分析。65553

毕业论文关键词  被动毫米波  辐射特性  交流全功率  特征提取

Title  The analysis of the characteristics of millimeter-wave

        radiation image in security inspection 

Abstract

Because there are numerous people in public places and some important work or production sites ,terrorist incidents and safety issues frequently take place there .So increasing attention was paid in public security issues by every country .To improve the effectiveness and accuracy of security detection system is one of the effective ways to solve the issue of public security .As a new generation of security equipment ,passive millimeter-wave（MMW）security system has made up for the shortcomings of the early ones ,such as metal security doors, X-ray detector and infrared detector .

MMW has strong penetration, high precision and the ability to work all-time, all-weather. Besides, the passive MMW system does not radiate electromagnetic waves, and there will be no damage to human or other objects .In this paper, security system based on passive MMW imaging technology is studied .Firstly ,overview the development background, significance and application of passive MMW imaging technology .Secondly ,introduce the basic principles of the MMW imaging .Thirdly ,analyze the radiation characteristics of the concealed objects under human body and how the passive MMW imaging system works .Lastly , analyze the radiation characteristics of MMW image through experiments applying a passive MMW imaging systems with a total power radiometer in 3mm band .

Keywords  Passive-Millimeter-Wave，radiation characteristics，AC full power，feature extraction

目 次

1  绪论 1

1．1  课题背景 1

1．2  研究现状 1

2  毫米波辐射原理 6

2．1  黑体辐射理论 6

2．2  几种温度及其关系 10

3  毫米波图像的辐射特性 13

3．1  辐射方程 13

3．2  人体藏匿物品的辐射特性分析 13

4  被动毫米波成像系统及图像滤波 15

4．1  被动毫米波成像工作原理 15

4．2  毫米波成像系统基本组成 16

4．3  交流辐射计成像系统 19

4．4  图像滤波基础 20

5  毫米波辐射图像边缘特征提取