摘要
根据推扫式线阵TDI-CCD成像系统的信号存储、传输与转换原理,分析了其在激光作用下产生不同饱和串扰现象的机理,建立了激光辐照TDI-CCD红外相机饱和串扰效应模型;考虑了视场外激光干扰过程中出现的侧斑现象,同时借助光学追迹模型,实现了连续激光干扰星载红外相机的成像仿真过程;通过图像质量评估因子定量分析了不同入射条件下激光辐射对相机输出图像质量的影响。结果表明:入射角不同,激光成像结果不同.选用1.064μm视场外激光在一定入射条件下,当改变激光入射角从2.86°到2.89°时,激光将出现侧斑;当激光功率密度提高1~4倍,光斑干扰面积百分比将不同程度的扩大.
Based on push broom linear TDI-CCD imaging system,the principle of charge storage and signal transfer process was studied.According to the mechanism of saturation and crosstalk phenomenon induced by different continuous laser conditions,the crosstalk effects model was established.The modeling and simulation process for secondary spot was included.With an optical ray tracing model,the irradiant distribution of the imaging result was simulated when continuous laser jamming the satelliteborne infrared camera.Some general quality factors on imaging results were selected to qualitatively evaluate output images with given laser irradiant angles.The research indicates that the laser jamming result is different as the laser incident angle changes.At the given condition of 1.064μm off-axis laser,when the laser incident angle differs from 2.86° to 2.89°,the secondary spot appears;When the laser power density is increased by 1～4 times,the percent of the crosstalk areas after laser jamming raises to some extent.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2017年第12期15-24,共10页
Acta Photonica Sinica
基金
国家自然科学基金(Nos.61377007
61575152)
中央高校基本业务费(Nos.NSIY151410
NSIZ011401)~~
关键词
激光辐照
激光干扰
阈值建模与分析
CCD红外相机
饱和串扰仿真
侧斑
图像质量评估
Laser irradiation
Laser disturbance
Threshold computation
Infrared CCD image sensor
Crosstalk simulation
Laser speckle
Image quality evaluation
