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在海水声速测量过程中,测量系统存在群延时,影响测量精度.建立声速直接测量系统信号传输模型,分析系统群延时及换能器群延时.建立声速直接测量系统并在恒温水槽中完成测量实验,所测量的声速值与某高精度声速仪测量声速值相差小于0.3 m/s,与经验公式计算声速值相差小于0.1 m/s.实验结果表明,系统群延时分析方法可用于声速测量.
In seawater sound velocity measurement process, the measurement system has group delay, which affects the accuracy of the measurement.The signal transmission model of the direct measurement system of sound velocity is established to analyze the delay of the system group and the delay of the transducer group.A direct sound velocity measurement system is established, The experimental results show that the method of system group delay analysis can be used to measure the velocity of sound of a high-precision anemometer, which is less than 0.3 m / s, which is less than 0.1 m / s from the empirical formula. Sound velocity measurement.