光子计数型CCD测量激光等离子体X射线

 介绍了光子计数型电荷耦合器件(CCD)的工作原理，标定了2.0~30 keV的探测效率。在超强超短激光等离子体相互作用中，实验用靶为复合靶，分别用Cu＋Mo和Al+Cu制作。第1层靶是Cu或Al物质作为电子示踪材料，第2层靶是Mo或Cu物质作为荧光材料，利用光子计数型CCD测量了Mo和Cu的X射线能谱, 同时得到CCD的能量分辨率大于37。该CCD可用于激光等离子体低通量高能X射线测量实验。     

高重复频率飞秒激光对面阵CCD的干扰和破坏

 采用800 nm，100 fs的超短脉冲激光器对硅面阵CCD进行辐照实验，观测到饱和、串扰以及永久性损伤等多种可能造成成像器件失效的现象，特别是在激光能量较高时，发现CCD在成像时出现了黑白屏的现象。在飞秒激光器以1，10和1 000 Hz工作的条件下，分别测量了硅面阵CCD的饱和阈值、串扰阈值和破坏阈值。对破坏后的CCD器件进行了显微分析。在1 kHz工作的条件下进行了视场外干扰实验，观察到串扰和全屏饱和的现象。     

电致发光成像技术在硅太阳能电池隐性缺陷检测中的应用

论述了一种利用硅太阳能电池在一定偏压下的电致发光(Electroluminescence,EL)成像来检测硅太阳能电池隐性缺陷的方法.硅太阳能电池的EL波长范围为850～1 200 nm.正向偏压下的EL光强反映了少数载流子的浓度及其扩散长度,而反向偏压下的EL区和发光强度对应于电池的缺陷区域和缺陷密度.用硅CCD相机...     

单线阵CCD相机定位精度评估模型及几何误差研究

为满足单线阵CCD相机立体测绘定位的需求,研究了相机几何误差对定位精度的影响,并建立了它们之间的数值模型,为相机的几何指标分析和量化提供理论支持.首先针对单线阵立体成像特点,分析了几何标定和像点量测误差对定位结果的影响;然后以前方空间交会公式为基础,推导出定位精度评估模型.该模型给出了定位精度随几何标定和像点量测误差的...     

基于高斯分布的星点图像亚像元定位算法研究

应用高斯点分布函数为数学模型,提出了一种新的获取高精度恒星质心位置的方法.由于入射到星像点邻域内像元中的光子能量呈近高斯分布,因此利用成像邻域内像元强度的比值,将高斯点分布函数展开成为关于质心位置的多项式,可将质心位置在x、y轴方向分别计算出来,并利用从星图中提取出的多星对角距误差的统计值来间接验证提出的算法.试验结果...     

单线阵CCD相机立靶测量原理

针对现有双CCD交汇立靶在室内使用时存在的光源复杂的问题,提出一种单线阵CCD相机立靶测量原理.采用一台线阵CCD相机,配合两个小功率半导体扇形一字线状激光器和投影板作为光源,将CCD相机的探测光幕面和激光光源的光幕面调整在同一个面内,当弹丸穿越探测光幕面时,档住了两个激光器投射在投影板上的部分光线,并在投影板上留下对...     

光电系统多光轴平行性校准方法的研究

 比较了目前常用的几种多光轴平行性测试方法。在大口径平行光管法的基础上,结合CCD技术提出了新的光轴平行性校准方法。该方法采用ZYGO干涉仪精确定焦,通过比较目标靶在CCD上共轭像的中心坐标和被测系统激光光斑中心坐标之间的差异,即可计算出红外或者可见光轴与激光轴的平行性误差。分析了该方法中大口径离轴抛物面镜焦面的确定与激光光斑中心定位等问题。讨论了该方法的测量不确定度,得到测量不确定度小于5″。     

Robust CCD photoelectric autocollimator for outdoor use

A robust charge-coupled device(CCD) photoelectric autocollimator for outdoor use is designed and demon-strated. The influence of outdoor conditions on the signal-to-noise ratio(SNR) and imaging quality of the measuring system is experimentally analyzed. The pulse width modulation technology is applied to the automatic feedback control of the actively regulated illuminating light source of the measuring system to maximize SNR while avoiding image saturation. A Fourier phase shift method for subpixel estimation is adopted to achieve high-accuracy measurement in the presence of noises. Experimental results indicate that the technologies proposed here largely improve the measuring stability,dynamic range,and accuracy of the CCD photoelectric autocollimator used outdoors.     

CCD摄像法测量激光远场光斑中图像校正和能量修正算法研究

介绍了CCD摄像法测量激光远场光斑的工作原理。依据CCD摄像机拍摄激光远场光斑的倾斜角度,在处理算法中利用透视投影原理,将采集光斑的畸变图像进行了校正;针对CCD摄像法摄取的漫反射激光光斑图像,构建了朗伯漫反射模型,利用朗伯修正算法将漫反射激光光斑的能量密度修正到直射激光光斑的能量密度,推导出了具体的修正计算公式。通过实际应用,验证了该算法在激光远场光斑测量中的有效性。     

Design of a very high frame rate camera based on an asynchronous CCD driving method

A very high frame rate camera is designed based on an innovative CCD driving method. The CCD driving method is mainly implemented on frame transfer CCDs. Asynchronous drive timing sequences are applied in the image and storage section of the CCDs. Several rows of the charge in the image section are binned onto the same row in the storage section, and there are the same number of images to be stored in the storage section before they are read out. Based on the new driving method, the frame transfer CCDs can work at a very high frame rate in acquiring burst images though the reading speed remains at a lower level. A very high frame rate camera is designed in this paper. The innovative CCD driving method is mainly of concern. An e2v's CCD60 is adopted in the camera system, whose full size resolution is 128 × 128, and the up most frame rate is 1000 Hz in the conventional CCD driving method. By using the presented method, the CCD60 based imager is capable of operating at up to 40000 frames per second (fps) at a recognizable resolution of 128 × 32. Comparing cameras using traditional binning and region of interest technologies, the frame rate is normally less than 5000 fps while the resolution is only 32 × 32 left.