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分析了激光功率密度增加到原来的10倍的时候,激光干扰行间转移CCD的串扰图像部分的灰度值并不是成比例地增加,并对串扰图像进行了仿真。由于光电二极管的溢出是不断进行的,垂直CCD的每个像元都获得所有超过阈值的像元溢出的光生载流子之和。每个超过阈值的像元溢出的光生载流子等于垂直CCD向下移动一个像元所需的时间内溢出的光生载流子。通过求解感光部分中光生电子遵守的方程,得到电子浓度增量和入射光功率的关系,进而仿真出串扰图像。仿真了激光能量为串扰阈值10倍和100倍量级时的串扰图像,仿真结果和实验结果可比。
When the laser power density is increased by 10 times, the gray value of the crosstalk image part of CCD interline transfer CCD does not increase proportionally, and the crosstalk image is simulated. As the photodiode overflow continues to occur, each pixel of the vertical CCD gets the sum of photo-generated carriers that overflowed beyond the threshold. Each photo-carrier that overflows beyond a threshold cell is equal to the photo-generated carrier that overflows within the time required for the vertical CCD to move down one pixel. By solving the equation of photogenerated electrons in the photosensitive part, the relationship between the increment of the electron concentration and the incident light power is obtained, and then the crosstalk image is simulated. The simulation results show that the laser energy crosstalk threshold of 10 times and 100 times the crosstalk image, the simulation results and experimental results comparable.