Abstract:无损检测(NDT)系统产生的图像通常存在着由随机干扰等因素引起的噪声,为了进行下一步的图像分析,图像增强是一步很重要的前期处理工作.图像增强的方法分为空域法和频域法两类,本文将灰度变换和小波变换的图像处理技术引入无损检测(NDT)图像处理中,运用MATLAB图像处理工具,对图像从空域和频域两方面进行增强,并在MATLAB语言环境下编程实现这两种方法.实验结果表明,应用MATLAB进行图像增强处理具有理想的效果和很高的工程价值.

Abstract:The key of image matching is to establish the correspondence between two images. This can be achieved by using the constraint of epipolar line. The epipolar geometric relationship between two images can be described by the fundamental matrix. Because of the noise disturbulance and correspondence outliers, it is difficult to estimate the fundamental matrix. In this paper, a method based on the RANSAC algorithm for fundamental matrix estimation after coordinate normalization is put forward. Thus, the estimation error due to the mismatching points is eliminated. The result shows that the above method has a higher matching precision and can also be used to detect the objects in infrared images.

Abstract:Dewar is the key component of an infrared detector and its quality has the direct influence on the reliability of the whole thermal imaging system. In order to detect the vacuum characteristics of a Dewar better, a set of equipment for checking a Dewar for its holding time of LN2 is designed in this paper. In this set of equipment, the performance variation of a Dewar when a device is in vacuum can be determined by testing the parameters such as the open-circuit voltage of the device and the volatilization of LN2 . In this paper, the heat leakage of a Dewar is calculated in theory and a lot of experiments are carried out. By comparison of the experimental data with the theoretical calculation, it can be found that this set of equipment has a better measuremnet precision and its expected design aim is achieved.

Abstract:紫外焦平面成像系统主要用以观测日光下高压输电系统的电晕放电现象.焦平面成像系统主要由信号采集系统、控制系统、信号处理系统和信号存储系统构成,再加上后端的显示器件,就可以完成视频信号的采集、处理、运算、传输和显示等功能.本文在设计紫外焦平面成像系统的时候,参考了发展相对成熟的非制冷型红外焦平面成像系统的技术结构.为了将采集图像的焦平面探测阵列与后端的电路系统连接起来,关键技术是以凸点制作为基础的倒装焊技术.由于焦平面探测阵列的引出点阵的密集性,最好采用性能指标较好的光刻结合电镀的倒装焊工艺.为了保证焊接过程

Abstract:巡航导弹体积小和低空飞行的特点,使得其具有目标红外辐射强度小、地面背景干扰大以及低空大气对其红外辐射的透过率低的优点.为了准确计算红外导引头对巡航导弹的探测距离,文章对巡航导弹的红外辐射特性以及地面背景的红外辐射特性进行了分析,进一步建立了红外导引头对巡航导弹探测距离的计算模型.提出了利用图解法对作用距离方程进行解算的方法,提高了作用距离模型的计算准确度.利用所建模型计算了某中距离红外导引头对一种巡航导弹的探测距离.计算结果表明,导引头对该巡航导弹的探测距离远小于对常规空中目标的探测距离,尤其在8μm～1

Abstract:无人值守地面传感器(UGS)技术与无线网络技术相结合,大大提高了战场事态感知能力.它不仅使UGS的应用系统技术发生了革命性的变化,也为未来以网络为中心的全新作战方式提供了强有力的事态感知解决方案.随着微电子技术的不断进步,传感器技术的内容由原位传感器(或遥感器)扩展,增加了无线网络传输技术,把数据或信息直接传送到需要它的用户手中.传感器技术增加了新的技术内涵,在此基础上传感器万维网(sensors web)应运而生.本文还专门论述传感器万维网的全新的技术能力.

Abstract:Since the thermal imaging technology was firstly used in the detection of breast cancers, it has been widely used in medical diagnosis and more and more attention has also been paid to the technology. The medical infrared thermal imaging is an imaging equipment for recording the thermal field of a huaman body. By comparison with the X-CT, MRI, B-ultrasound Wave and so on, it has its unsubstitutable complementary function. It is a new branch of the modern medical imaging. In this paper, the application of the infrared thermal imaging technology in the field of medical treatment is mainly presented, the status and application principle of the infrared thermal imaging technology ave expounded and the advances in its clinical application are summarized.