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研究分析了CCD光电转换后信号电荷的传输过程以及激光高亮度的特点。认为高亮度的激光容易使感光二极管饱和,从而使光生电荷不通过读出脉冲控制而直接溢出至垂直CCD中,形成溢出信号电荷包;高亮度激光在垂直CCD内的漏光信号较强,从而直接在垂直CCD中形成漏光信号电荷包。溢出信号电荷包和漏光信号电荷包不依赖读出脉冲而出现于垂直CCD中,它们叠加在一起称之为次信号电荷包。次信号电荷包,经过垂直CCD的耦合转移动作,就形成了区别于激光主光斑的次光斑。研究中对次光斑的间距及循环移动的规律给出了定量的分析。次光斑的间距由CCD的转移频率和激光的重频频率所决定。而相邻帧中,主光斑与次光斑的间距有周期性的变化,从而造成了CCD输出视频中的次光斑循环移动。这种变化是由CCD垂直扫描周期被激光脉冲间隔时间整除后的余数所决定的。
The process of signal charge transfer after CCD photoelectric conversion and the characteristics of laser high brightness are studied and analyzed. It is considered that the high-intensity laser easily saturates the photosensitive diode, so that the photo-generated charge overflows directly into the vertical CCD without controlling the readout pulse to form an overflow signal charge packet. The high-intensity laser light has a strong leakage signal in the vertical CCD, A light leak signal charge packet is formed in the vertical CCD. The overflow signal charge packet and the leaky signal charge packet appear in the vertical CCDs independent of readout pulses, and they are superposed together as a sub-signal charge packet. Sub-signal charge packet, after the vertical CCD coupling transfer action, the formation of the main spot from the laser sub-spot. In the research, the quantitative analysis of the distance of sub-flare and the law of cyclic movement is given. The secondary spot spacing is determined by the transfer frequency of the CCD and the frequency of the laser repetition rate. In adjacent frames, the spacing between the main spot and the sub-spot varies periodically, causing the sub-spot circular movement in the CCD output video. This change is determined by the remainder of the CCD vertical scanning period after the laser pulse interval time divisions.