水体散射对气泡后向光散射特性的影响

Effect of Water Scattering on Light Backscattering Properties of Bubbles

采用Lambert-Beer定律对水中气泡幕前向、后向散射激光功率进行了理论推导,得出了接收信号信噪比的计算公式。采用光学遮挡的方法对近距离水体后向光散射信号进行屏蔽,采用激光功率计对后向光散射信号进行测量。结果表明,近距离水体后向光散射对气泡的后向光散射影响显著,对近距离水体的后向光散射信号进行抑制,可以显著提高接收信号的信噪比。

The power of light forward and backward scattered by bubbles in water was predicted by the Lambert-Beer law, and the formula of SNR was educed. The light backward scattered by water at close quarters was shielded by optical shelter and the power of backward scattered light was measured by a laser power meter, Tne results show that the effect of water scattering on light backscattering properties of bubbles is obvious, and SNR of received signals will be improved if the light backscattered from water at close quarters is restrained.