【作者】 王琳；

【导师】 杨甬英；

【作者基本信息】 浙江大学 ， 光学工程， 2010， 硕士

【摘要】 当前电力公用事业部门应用了一系列手段来检测传输线以及配电设备。可见与紫外双光谱相机成为了这些部门最新的可视化诊断工具,以识别电力设备中的潜在破损。本课题在对位于日盲波段的深紫外辐射进行研究与分析的基础上,选择合适的整体电子系统软、硬件框架,设计了一套嵌入式双光谱图像采集与数据处理系统,实现紫外信号与可见光背景双光谱图像的采集、处理、叠加、显示、存储等功能。本文在DSP+FPGA构建的便携式硬件平台上,实现了实时化采集可见与紫外双通道图像数据,并进行了进一步的图像格式转换、双通道图像叠加与图像分析。其中紫外光通道为检测到极微弱的电晕,采用了进口的紫外探测器,即带碲化铯光电阴极的像增强管作为接收检测装置,分辨率可达单光子计数水平。可见光通道以三百万像素的高速CMOS图像传感器确保了图像的清晰度。系统整体软件建立在支持多通道、多算法的RF5参考框架之上,既使框架的搭建、算法的添加变得简单,又确保了系统的实时运行速度。经过处理后的图像可以输出到液晶屏与寻像器进行显示,也可对选定的合适图像进行压缩与存储,以便进一步分析。最后介绍了系统调试过程中的一些实用经验与方法,且在实际高压变电站现场电晕检测中,与国外同类进口仪器进行比对实验,得到了较好的结果。更多还原

【Abstract】 Presently electricity utilities make use of a number of inspection tools to survey their transmission lines and electrical distribution equipment. Visible and ultraviolet cameras are the latest visual diagnostic tools available to utilities to identify potential failures on electrical equipment. After researching the UVC radiation in solar blind spectrum, a proper electronic hardware and software frame is chosen to realize an embedded dual-spectrum image acquisition and data processing system with such functions as ultra-violet and visible image acquisition, processing, fusion, displaying, storage, and etc..Based on the DSP and FPGA hardware platform, a system is designed to collect images from both visible and ultraviolet channels. Moreover, it performs many fuctions such as image format transformation, image fusion and analysis. For detecting the weak signal of corona, an ultra-violet detector is imported in the form of an image intensifier tube with a Cesium-Telluride photocathode, which is competent for single photon counting. For acquiring visible images, a 3-million-pixel high-speed CMOS is implemented to assure definition of images and running speed of the system.The real-time software system is built on Reference Framework 5 (RF5), since it supports multi-channel and multi-algorithm system, which is convenient for users to build up software frames and add new algorithms. The processed images can be either displayed on two LCDs, or compressed and saved for further analysis. Finally, several methods of program debugging and system adjustment are introduced. Compared to the imported device of the same area, the experimental results in the field show that the designed system has outstanding performance in the detection of corona radiation of high-voltage electricity equipments.更多还原