基于激光距离选通技术的水下湍流检测方法研究

Research on Underwater Turbulence Detection Based on Time-of-flight

目前水下激光传播在成像和激光通信等众多领域均有着广泛的应用。水下成像技术由于受到水下散射噪声和光学湍流的影响,使得水下采集的图像产生模糊和变形。因此,水下湍流的研究对激光传播领域有着重要的意义。距离选通技术是水下成像技术中较为成熟的技术,它可以有效消除激光在水下传播过程中所受到的后向散射效应。创新地提出不同距离下的水下湍流重构算法,介绍了利用激光距离选通技术检测水下湍流的特点和原理,并建立实验平台用以验证本文所提出的方法和理论模型。最后结合实验结果对所用方法和水下湍流的影响进行了验证和分析,使得波前重构面型的均方根误差达到了0.2657mm。

Recently,underwater laser propagation has been widely used in many fields such as imaging and laser communications. Underwater imaging technology,due to underwater scattering noise and optical turbulence,the underwater captured image is blurred and distorted. Therefore,the research of underwater turbulence has great significance to the field of laser propagation. Range-gated technology is a relatively mature underwater imaging technology,which can effectively eliminate the backscattering effect by the laser in the underwater propagation process. In this paper,the underwater turbulence reconstruction algorithm under different distances is proposed. The characteristics and principles of underwater turbulence detection using laser range-gated technology are introduced. The experimental platform is established to validate the proposed method and theoretical model. Finally,the underwater turbulence were verified and analyzed by combining the experimental results of the used method in this paper. The RMS error of wavefront reconstruction surface can reach 0.2657 mm.