中国激光, 2015, 42 (10): 1012002, 网络出版: 2022-09-24   

激光主动成像中散斑噪声对波前畸变校正性能的影响

Effect of Speckle Noise on Wavefront Distortion Correction in Laser Active Imaging
作者单位
1 华北理工大学电气工程学院, 河北 唐山 063009
2 华北理工大学图书馆, 河北 唐山 063009
摘要
针对激光主动成像中的波前畸变和散斑噪声,分析了散斑噪声对基于图像指标优化的波前校正性能影响。通过仿真不同散斑噪声水平下图像清晰度指标值随波前均方根值的变化趋势,研究了散斑噪声对波前校正性能的影响。在此基础上,通过开展大气湍流波前畸变闭环校正数值仿真,对分析结果进行了验证。研究结果表明:随着散斑噪声的增大,图像清晰度指标随波前均方根(RMS)值的单调性和线性度明显变差,尤其是在RMS小于1 rad范围内,导致收敛速度和最终的校正精度变差;当散斑噪声较大时,随着波前畸变的增大,散斑噪声对校正性能的影响也越大。
Abstract
Considering the wavefront aberration and speckle noise in laser active imaging, the influence of speckle noise on wavefront correction based on image metric optimization is discussed. The effect of speckle noise on wavefront correction is researched by simulating the trends of image sharpness value with the root-mean-square (RMS) value of wavefront under different speckle noise level. Based on that, conclusions are verified by the numerical simulation of atmospheric turbulence wavefront close-loop correction. The results show that, with the increase of speckle noise, the monotonicity and linearity between image sharpness metric and the wavefront RMS value are significantly worse, especially while the RMS value is less than 1 rad, so that the convergence speed and the final accuracy are deteriorated. Moreover, when the speckle noise is large, with the increase of wavefront distortion, the effect of speckle noise on the correction performance is much more remarkable.

陈波, 杨靖, 杨旭, 李小阳. 激光主动成像中散斑噪声对波前畸变校正性能的影响[J]. 中国激光, 2015, 42(10): 1012002. Chen Bo, Yang Jing, Yang Xu, Li Xiaoyang. Effect of Speckle Noise on Wavefront Distortion Correction in Laser Active Imaging[J]. Chinese Journal of Lasers, 2015, 42(10): 1012002.

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