强湍流效应下激光大气传输短曝光光斑统计分析
Statistical properties of short-exposure images with strong turbulent effects
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摘要: 利用数值模拟的方法，对强湍流效应下激光大气传输焦平面短曝光光斑的统计特性进行了初步分析，并与实验结果进行了对比。结果表明：在强湍流效应下，焦平面短曝光光斑破碎成一系列的小光斑，这些破碎光斑的等效半径与爱里斑半径近似相等；接收器中心置于光轴轴心处，当接收孔径等于爱里斑直径时，接收的均值光强最大。Abstract: Numerical simulation was used to quantitatively analyze the statistical properties of short-exposure images with strong turbulent effects. Moreover, we compared the numerical results with the experimental results. The analytic results show that the short-exposure images break into some small spots with strong turbulent effects.For example, the coherence length of atmosphere is equal to 4.7 cm. In addition, the equivalent scale of these broken spots is comparable with the Airy spot. Moreover, when the receive aperture is equal to the dimension of Airy spot, the received average intensity on the axis is the largest.
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Key words:
- laser propagation /
- turbulent atmosphere /
- broken spot /
- airy spot
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