水下鬼成像抗扰动能力的实验研究

Experimental Study on Anti-Disturbance Ability of Underwater GhostImaging

水下探测作业过程中,水体因外界环境而产生扰动,从而使水下的折射率发生变化,增强水体对光的散射作用,导致水下光学目标成像模糊,成像质量降低。鉴于此,采用鬼成像方式克服水下扰动,利用参考光场和测量光场的二阶相干性分别测量某一时刻参考光束在采集平面上的光场分布与测量光束的在采集平面上的总光强,根据总光强重建鬼成像。实验过程中,利用超声波对水体进行扰动,对比鬼成像方式与经典成像方式的成像结果并比较两种成像结果的峰值信噪比,研究鬼成像系统在水下抗扰动能力。实验结果表明,在水下扰动的环境中,鬼成像方式的图像质量高于经典成像方式。

During underwater detection operations,the water body is disturbed by the external environment,which changes the underwater refractive index,enhances the scattering effect of the water body on light,and causes the underwater optical target to be blurred and the image quality is reduced.In view of this,the ghost imaging method is used to overcome underwater disturbances,and the second-order coherence of the reference light field and the measurement light field are used to measure separately.At a certain moment,the light field distribution of the reference beam on the collection plane and the measurement beam on the collection plane.According to the total light intensity,the ghost image is reconstructed.During the experiment,ultrasonic waves are used to disturb the water body,the imaging results of ghost imaging methods and classic imaging methods are compared,and the peak signal-to-noise ratio of the two imaging results are compared to study the anti-disturbance ability of the ghost imaging system under water.The experimental results show that the image quality of ghost imaging method is higher than that of classic imaging method in the environment of underwater disturbance.