基于流体理论分析不同区段的射流界面特征，利用高速数码相机拍摄射流水波导的气液交界面形态，选择恰当的图像处理算法提取并重构射流界面轮廓，根据重构的三维光学模型进行光线追迹仿真，最终获得射流波动段的损耗特性。结果表明，射流界面的波动振幅和频率将直接影响光线在其内部的全内反射传输。处于波动开始阶段的射流，由于波动幅度和频率相对较小，不能引起传输损耗。当射流界面波动达到一定程度时，其损耗特性开始逐渐显现，从而影响微细水射流作为介质波导的传输能力。

Shapes of a water- jet in different regimes are analyzed on the basis of fluid theory. High speed photography is used to record the turbulence of the water-air interface. The water-jet contours are detected and reconstructed by using digital image processing algorithms. The ray tracing method is employed to investigate the optical losses produced by the surface perturbation. The results show that the amplitude and frequency of turbulence have a great impact on light propagation under the effect of total internal reflection. At the stage of incipient turbulence, no optical losses is caused since the wave amplitude and frequency are the relatively small. But when the amplitude and frequency of turbulence exceed certain threshold values, the power losses tend to increase so that it weakens the ability to guide light of water-jet in this kind of situation.