研制了悬滴法表面张力实验系统，温度测量范围为283．15～323．15 K ，温度测量误差不超过±0．5 K ．采用轮廓拟合法对表面张力进行计算，在VC＋＋环境下分别用坐标轮换法和Nelder‐Mead单纯形法进行了编程实现．利用正庚烷和乙醇对实验系统进行校验，结果表明：2种物质的表面张力实验值与文献值偏差在±0．2mN·m －1以内，坐标轮换法和Nelder‐Mead单纯形法的计算结果一致．%A surface tension experiment system using full‐profile fitting pendent drop method was built .The system could work at temperatures ranging from 283 .15 to 323 .15 K and its uncertainty of temperature measurement was better than ± 0 .5 K .The full‐profile fitting was implemented with co‐ordinate alternation method and Nelder‐Mead simplex method with VC+ + .The surface tensions of n‐heptane and ethanol were measured with this system .The deviations between experimental data and literature data were less than 0 .2 mN · m -1 ,which proved the reliability and stability of the system . Besides ,the analysis of experimental data suggested that both coordinate alternation method and Nelder‐Mead simplex method had good convergence and the latter was more computationally efficient .
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