成像光谱的信息采集与数据处理

论述了成像光谱技术中的光学成像技术、光谱信息采集及探测器像点与光谱图像像点的定位技术,提出了一种精确确定ＣＣＤ面阵上像敏元与光谱图像像素对应关系的新方法。系统电路能够对视频信号进行处理,输出带有标志线的复合视频信号,同时精确测定标志脉冲的位置,以数据形式提供给计算机,通过计算机对图像及采集的数据的分析处理,从而确定图像像素和ＣＣＤ面阵上像敏元的对应关系。系统软件能方便的实现对电路的控制、数据采集、光谱图像的分析、显示绘制图像的ＲＧＢ值和灰度曲线,能稳定运行于Ｗｉｎｄｏｗｓ环境下,使用灵活方便     

Selective epitaxial growth of Ge nanodots with ultra-thin porous alumina membrane

We demonstrate that ultra-thin porous alumina membrane （PAM） is suitable for controlling of both size and site of Ge nanodots on Si substrates. Ge nanodots are grown on Si substrates with PAM as a template at different temperatures with molecular beam epitaxy （MBE） method. Ordered Ge nanodot arrays with uniform size and high density are obtained at 400 and 500 ℃. Spatial frequency spectrums transformed from scanning electron microscopy images through fast Fourier transform are utilized to analyze surface morphologies of Ge nanodots. The long-range well-ordered Ge nanodot arrays form a duplication of PAM at 400 ~C while the hexagonal packed Ge nanodot arrays are comolementarv with PAM at 500℃.