强激光与粒子束, 2015, 27 (1): 011015, 网络出版: 2015-01-26  

采用投影光学估计弱起伏条件下的大气闪烁指数

Using projector optics to estimate the atmospheric scintillation in weak fluctuation
作者单位
1 电子科技大学 航空航天学院, 成都 611731
2 中国空间技术研究院西安分院 研发中心, 西安 710036
摘要
在远场散斑投影成像系统上整合大气闪烁指数测量功能, 有助于全面分析激光大气传输特性及其对光电系统性能的影响。但是在大口径接收时, 大气闪烁会因孔径平滑效应而变得微弱, 光源稳定性引起的强度起伏会更为明显。针对这一问题, 基于光源强度起伏和大气闪烁的乘性调制假设, 建立了考虑光源强度起伏的大气闪烁指数的测量模型。利用光源强度起伏不随孔径变化而大气闪烁随孔径变化这一差异性, 通过投影光学在同一时刻测量两个不同接收孔径上的光强闪烁, 结合弱起伏条件下的孔径平滑因子来求解测量模型, 从而分别估计大气闪烁指数和光源强度闪烁指数。实验结果表明, 在孔径0.05 m至0.4 m之间, 实测值和理论估计值的最大相对误差小于9.685%, 理论模型与实验符合度较高。采用该方法可以在投影光学上实现弱起伏条件下的大气闪烁指数估计。
Abstract
It is meaningful to integrate the atmospheric scintillation measurement on the far field speckle’s projection imaging system for comprehensively analyzing the characteristics of laser atmospheric propagation and its influence on the photoelectric system. However, the atmospheric scintillation will become very weak at large receiving aperture because of aperture averaging effect, and the intensity fluctuation induced by laser source stability will become obvious. Therefore, an atmospheric scintillation measurement model considering the laser source intensity fluctuation is established based on the multiply stochastic process assumption of laser source intensity fluctuation and atmospheric scintillation. Using the characteristic that the laser source intensity fluctuation does not vary with aperture and the atmospheric scintillation varies with aperture, the atmospheric scintillation and laser source intensity fluctuation can be estimated respectively through the measurement model by combining the aperture averaging factor in weak fluctuation and the intensity scintillation measurement result with different receiving aperture at the same time in the projector optics. The experiment results show that the relative error between theoretical prediction and experimental values is below 9.685% at the aperture from 0.05 m to 0.40 m. This method could estimate the atmospheric scintillation in weak turbulence fluctuation based on the projection optics system.

蒋大钢, 朱彬, 黄健, 幺周石, 李晓峰, 秦开宇. 采用投影光学估计弱起伏条件下的大气闪烁指数[J]. 强激光与粒子束, 2015, 27(1): 011015. Jiang Dagang, Zhu Bin, Huang Jian, Yao Zhoushi, Li Xiaofeng, Qin Kaiyu. Using projector optics to estimate the atmospheric scintillation in weak fluctuation[J]. High Power Laser and Particle Beams, 2015, 27(1): 011015.

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