力敏传感器测量液体表面张力系数过程中拐点问题的讨论

目的：讨论液体表面张力系数测量过程中的拐点问题，减小测量误差。方法：用不同长度、半径的金属框和不同内外径的金属圆筒作为实验用具，测量拐点问题。结果：力敏传感器测量液体表面张力系数过程中出现拐点．且拐点随半径长度不同而变化。结论：液膜的薄厚和液面的弯曲形变引起拐点变化．如果长度、半径选择合适可以避免出现拐点。

Discussion of Inflexion Question in Course of Measuring Surface Tension Coefficient by Force Sensor

Objective To discuss the inflexion question in the course of measuring surface tension coefficient. Methods Metal frames with different lengths, radials and metal cylinders with different inside ＆ outside radials were used to measure the inflexion. Results The inflexion appeared in the course of measuring surface tension coefficient by using force sensor and the inflexion changed with the different radials and lengths of the metal frames. Conclusion The thickness and bending of the fluid membrane results in the change of inflexion, and the inflexion can be avoided with the length and radial chosen properly.