摘要
根据数值方法获得的在湍流大气中传播的激光束的长曝光光斑空间分布特征，确定了ＣＣＤ成像技术中的背景信号的大小，进而解决了光斑尺度的测量问题。从数值分析和实验测量两方面分析了被湍流大气退化的光斑的形变特征的描述方法，引入了对应于工程应用的高于一定阈值的最大光斑半径和占空比。最后根据数值计算的结果提出了湍流大气中光场的局域增强现象。
Basing on the space distribution characteristics of the long term light image in the turbulent atmosphere the background signal of a CCD imaging system can be determined accurately, and then we can measure the image size accuratly with the CCD imaging system. The maximal radius and space filling ratio related to engineering applications are introduced for the description of the deformation characteristics of the light image degraded in the turbulent atmosphere by analyzing both simulation data and experimental data. Finally we mentioned the phenomenon of the enhancement of light intensity in certain regions in the simulated images and its potential importance.
出处
《光学学报》
EI
CAS
CSCD
北大核心
1998年第4期451-456,共6页
Acta Optica Sinica
关键词
光传播
大气湍流
光斑尺度
形变特征
激光
light propagation, atmosphere turbulence, light image size and characteristics.
