蛙人回波建模与实验研究

Modeling and experimental study of echo from a diver

选用蛙人回波的简化模型,结合实验获得各主要因素对蛙人目标强度贡献的量值。分别选用简化的胸腔、躯干、大腿骨等人体器官和开式呼吸气泡群、干式潜水服、呼吸气瓶等的声散射模型。通过码头实验测量了蛙人的目标强度,频率为75kHz。在所有影响蛙人目标强度的因素中,开式呼吸气泡群对目标总强度贡献最大,其目标强度大于-16.9dB;其次是干式潜水服,约-17dB;再次是开式呼吸气瓶,约为-24dB;蛙人身体目标强度约-27.2dB;另外实验测量了肺部组织的目标强度,约-25.9dB,频率125kHz。理论模型和实验均表明,开式呼吸气泡群和潜水装备对蛙人回波的贡献远大于蛙人身体。

Models of sound scattering from a diver are chosen, to get the target strength （TS） of key scattering factors of a diver. Simple scattering models of human organs, including thorax, trunk, femur, and open-circuit bubble cloud, dry diving suit, scuba bottle are selected. The TS of the diver is measured in a wharf at 75kHz. Of all factors which effect the TS of a diver, open-circuit cloud are the most important, up to -16.9dB, dry diving suit the second at about -17dB, while open-circuit scuba bottle the third at -24dB, and the diver＇s body is the fourth at -27.2dB. Besides, the TS of lung tissues is measured to be about -25.9dB at 125kHz.The models and the experiments indicate that the open-circuit clouds and the diving setups are more important than diver＇s body in effecting the TS of a diver.