针对现有的测定液体表面张力系数的方法存在设备昂贵、测定结果容易受各种因素干扰而测试精度不足等问题, 提出了一种使用不等内径U型管, 采用局部力平衡方法结合拉普拉斯方程, 以及MATLAB图像处理和LabVIEW虚拟仪器系统, 测定液体表面张力系数的方法。与现有的测定液体表面张力系数的拉脱法相比, 该方法具有测试精度高、样品需要量少、测试成本低等特点。

Aiming at the problem of present liquid surface tension coefficient measuring method having the disadvantages of expensive measuring equipment and low measuring precision, a new method for measuring liquid surface tension coefficient was proposed. This method could complete the measure with a unequal inner diameter U-tube by using the local force balance method combined with the Laplace’s equation, MATLAB image processing and LabVIEW virtual instrument system. Compared with the present liquid surface tension coefficient measuring method-pulling and separating method, the proposed method has the advantages of high measuring precision, requiring less sample and low cost, etc.