紫外辐射检测的嵌入式双光谱图像采集及数据处理系统设计

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英文题名：Design of Embedded Dual-Spectrum Image Acquisition and Data Processing System for UVC Radiation Detection 作者：王琳 论文级别：硕士 学科专业名称：光学工程 中文关键词：双光谱 ; 紫外 ; 数字图像处理 ; DSP ; RF5 ; CMOS 英文关键词：Dual-spectrum ; Ultraviolet ; Digital Image Processing ; DSP ; RF5 ; CMOS 学位年度：2010 导师：杨甬英 学科代码：0803 学位授予单位：浙江大学 论文提交日期：2010-01-01 答辩委员会主席：单越康

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。
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.

引文

1.F Bologna,N Mahatho and D A Hoch,Infra-red and Ultra-violet Imaging Techniques Applied to the Inspection of Outdoor Transmission Voltage Insulators,IEEE Africon 2002,593-598
    2.S.M.Gubanski,h.Dernfalk,J.Andersson and H.Hillborg,Diagnostic Methods for Outdoor Polymeric Insulators,IEEE Transactions on Dielectrics and Electrical Insulation,Vol.14,No.5,October 2007,1065-1080
    3.R Stolper and Jaco Hart,CSIR and N Mahatho,The Design and Evaluation of a Multi-Spectral Imaging Camera for the Inspection of Transmission Lines and Substation Equipment,Eskom
    4.顾聚兴,紫外摄像机在白天探测输电线的电晕放电,红外月刊,2002年,44页
    5.伍靖,微光双通道彩色夜视技术研究,南京理工大学硕士学位论文
    6.王毅,倪国强,李勇量,基于TMS320C6x的双波段图象高速融合系统,中国图象图形学报,第7卷(A版),第10期
    7.王建平,季学锋,穆道明,基于DSP的多路音、视频采集处理系统设计,国外电子元器件,2006年,第6期
    8.High Performance Image Intensifiers Datasheet
    9.许强,微弱中紫外辐射探测器技术,光电对抗与无源干扰,1999年,第3期
    10.Battery-Operated Ultraviolet Lamps Datasheet
    11.TMS320DM642 Video/Imaging Fixed-Point Digital Signal Processor Data Manual,Texas Instruments,http://www.ti.com,2004
    12.3-Megapixel Digital Image Sensor MT9T001 Datasheet
    13.Interfacing a CMOS Sensor to the TMS320DM642 Using Raw Capture Mode,Texas Instruments,http://www.ti.com,2004
    14.Reference Frameworks for eXpressDSP Software:RF5,An Extensive, High-Density System,Texas Instruments,http://www.ti.com,2003
    15.詹海萍,鲍赟,田维坚,基于Bayer格式的图像压缩方法,科学技术与工程,第6卷,第24期,2006年12月
    16.An RF5 Adaptation for IDMA2-Based Algorithms:A JPEG Example,Texas Instruments,http://www.ti.com,2003
    17.郭玉忠,谭志宏,方波,使用C6000 McBSP实现SPI接口的方法研究,航空计算技术,第38卷,第1期,2008年1月
    18.张洪涛,莫文承,李兵兵,基于SPI协议的SD卡读写机制与实现方法,电子元器件应用,第10卷,第3期,2008年3月
    19.邓剑,杨晓非,廖俊卿,FAT文件系统原理及实现,计算机与数字工程,第33卷,第9期,2005年
    20.Wang Lin,Yang Yong-ying,Wang Dao-dang,Liu Dong,Real-time Portable Dual Channel Image Fusion and Data Processing System,in 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies:Optical Test and Measurement Technology and Equipment,SPIE,728307-1-6.
    21.TMS320C6000 DSP/BIOS API Reference Guide,Texas Instruments,http://www.ti.com,2007
    22.TMS320C6000 Chip Support Library API Reference Guide,Texas Instruments,http://www.ti.com,2004
    23.TMS320 DSP Algorithm Standard API Reference Texas Instruments,http://www.ti.com,2004