液体表面张力系数的激光衍射测量法

Liquid Surface Tension Coefficient with Laser Diffraction System

利用液体表面声波(Surface Acoustic Waves,SAW)对激光的衍射效应,设计了一套设备简单、操作方便、测量成本低的低频液体表面波激光衍射系统,并对不同温度下水和NaCl溶液的表面张力系数进行了测量,得到了表面张力系数和温度之间的解析关系.实验结果表明表面张力系数和温度之间呈近似线性关系,并且相关系数大于0.99,说明该实验系统能够满足表面张力系数测量和研究的要求.

According to laser diffraction effect on the liquid surface waves, a laser diffraction measurement system of low-fre- quency liquid surface waves was built. The system equipment is simple structure, easy to operate, of low operation cost. The surface tension coefficients of water and NaC1 were measured at different temperatures with the system, and the analytic expression of surface tension coefficient and temperature was derived. Results show that the surface tension coefficient of water and NaC1 is linear correla- tion to temperature and the correlation coefficient is grater than 0.99. The test system is capable of studying the surface tension.