Ultrasonic wave velocities were measured and calculated by using velocity meter of ultrasonic gating, according to the principle of ultrasonic grating. By comparing the velocities in NaCl in different temperatures and concentrations and data fitting, the relationship between velocity and concentration and the relationship between velocity and temperature were found out. The result shows that when the concentration is 3% ~5% , the velocity of sound wave increases monotonously with the increase of concentration. The velocity and the concentration have a linear relationship if temperature is the same. Besides, the ultrasonic wave velocity was studied at 3% NaCl solution and water. It was found out that the velocity and temperature have the same linear relationship, I. e, the velocity of sound wave increases monotonously with the increase of temperature.%根据超声光栅测量声速的原理,使用超声光栅声速仪测量并计算出超声波在不同浓度和温度条件下该溶液中的传播速度.通过对比不同浓度、不同温度的NaC1溶液中的声速并对其进行数据拟合,得出声速与溶液浓度、声速与溶液温度的关系.实验结果表明,在相同温度,浓度3％ ～15％,声速随溶液浓度的增加而增加,并显现出良好的线性关系；利用温度递增研究了3％ NaCl溶液和清水中超声传播的速度,声速与温度显现出良好的线性关系,声速随液体温度的增加而递增.
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