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Numerical simulation of laser propagation in ocean turbulence with the nonuniform fast Fourier transform algorithm
Optical Engineering ( IF 1.3 ) Pub Date : 2020-10-26 , DOI: 10.1117/1.oe.59.10.106109
Ruiyan Jin 1 , Shuai Wang 1 , Ping Yang 1
Affiliation  

Abstract. Our work studies the spatial distribution of ocean optical turbulence through numerical simulation. We used the ocean optical turbulence phase screen created by the ocean power spectrum to study the effect of varying the refractive index of water via a laser beam propagating through ocean optical turbulence. Because the intensity of ocean optical turbulence is much higher than that of atmospheric turbulence, when simulating the ocean phase screen, traditional methods based on the fast Fourier transform (FFT) algorithm introduce enormous errors in the low-frequency band. Some interpolation algorithms commonly used in atmospheric turbulence simulation can reduce these errors. However, their calculation complexity is always high, so the computational speed is slow. We combine a nonuniform sampling method based on variations in the ocean turbulent power spectrum and the nonuniform FFT algorithm to generate phase screens of ocean optical turbulence. The proposed algorithm can solve the deficiency of the long runtime of the traditional algorithm with even better accuracy. In addition to the traditional phase structure function, we measured the far-field distribution of the laser transmitting through water turbulence caused by temperature contrasts, and the experimental results have outstanding agreement with the simulated far-field image from our ocean phase screen. To the best of our knowledge, this is the first work to verify the accuracy of the phase screen by conducting far-field image experiments.

中文翻译:

非均匀快速傅里叶变换算法在海洋湍流中的激光传播数值模拟

摘要。我们的工作通过数值模拟研究海洋光学湍流的空间分布。我们使用由海洋功率谱创建的海洋光学湍流相位屏来研究通过激光束通过海洋光学湍流传播来改变水的折射率的影响。由于海洋光学湍流的强度远高于大气湍流,因此在模拟海洋相位屏时,基于快速傅里叶变换(FFT)算法的传统方法在低频段引入了巨大的误差。大气湍流模拟中常用的一些插值算法可以减少这些误差。但是它们的计算复杂度总是很高,所以计算速度很慢。我们结合了基于海洋湍流功率谱变化的非均匀采样方法和非均匀 FFT 算法来生成海洋光学湍流的相位屏幕。该算法能够以更好的精度解决传统算法运行时间长的不足。除了传统的相结构函数外,我们还测量了由温度对比引起的水湍流中激光透射的远场分布,实验结果与我们的海洋相屏模拟远场图像具有很好的一致性。据我们所知,这是通过远场图像实验验证相位屏精度的第一项工作。该算法能够以更好的精度解决传统算法运行时间长的不足。除了传统的相结构函数外,我们还测量了由温度对比引起的激光透射水湍流的远场分布,实验结果与我们的海洋相屏模拟远场图像具有很好的一致性。据我们所知,这是通过远场图像实验验证相位屏精度的第一项工作。该算法能够以更好的精度解决传统算法运行时间长的不足。除了传统的相结构函数外,我们还测量了由温度对比引起的激光透射水湍流的远场分布,实验结果与我们的海洋相屏模拟远场图像具有很好的一致性。据我们所知,这是通过远场图像实验验证相位屏精度的第一项工作。我们测量了由温度对比引起的水湍流中激光透射的远场分布,实验结果与我们的海洋相位屏模拟的远场图像非常吻合。据我们所知,这是通过远场图像实验验证相位屏精度的第一项工作。我们测量了由温度对比引起的水湍流中激光透射的远场分布,实验结果与我们的海洋相位屏模拟的远场图像非常吻合。据我们所知,这是通过远场图像实验验证相位屏精度的第一项工作。
更新日期:2020-10-26
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