冰中纵波声速测量方法研究

Research on measurement method of compression wave sound velocity in ice.

冰中声速对冰层覆盖下海洋信道声传播特性及水中目标声特性研究具有重要意义。由于气泡、卤水、杂质等因素的影响,不同冰介质的物理性质存在较大差异,导致冰中声波的传播速度有所不同。本文对冰介质中纵波声速开展测量方法研究,采用直达法测量渤海湾冬季海冰、内陆湖中淡水冰及人造淡水冰纵波声速,测量结果表明海冰中纵波声速约为3360±162m/s,湖冰3772±57m/s,人造淡水冰3729±23m/s,结果可为冰介质声学特性、冰层下声传播特性及冰区目标声特性相关研究提供参考。

The sound speed in ice has great significance to the study of the acoustic propagation characteristics of the ocean channel under ice covered and underwater target acoustic characteristics. Due to the influence of bubbles, brines, impurities and other factors, the physical properties of different ice are quite different, resulting in different propagation velocity of sound waves in ice. In this paper, measurement method of compression wave velocity in ice has been studied. Direct method is used to measure the pressure wave in Bohai bay sea ice, inland lake water ice and artificial freshwater ice. The measured results show that pressure wave speed is about3360±162 m/s in sea ice,3772±57 m/s in lake ice and3729±23 m/s in artificial ice. This results can provide reference to research on ice medium acoustic characteristics, acoustic propagation characteristics and target acoustic characteristics under ice covered.