准绝热法微型镓固定点相变特性研究

Research on Phase Change Characteristic of Miniature Gallium Fixed-point Using Quasi-adiabatic Measurement Method

介绍了可用于原位校准的微型镓相变固定点形成过程,准绝热测试系统的结构和工作原理,测量了微型镓相变固定点在准绝热测试系统中的相变特性。实验结果表明微型相变镓固定点的相变温度与加热功率之间存在强线性关系,其线性拟合因子R^2为0.9957,并且随着功率越降低,其相变熔化温度越接近镓固定点的标准值。在相同的准绝热复现条件下,其相变温度的复现性优于2 mK。

The formation process of miniature Ga fixed-point which can be used for in situ calibration, the structure and working principle of the quasi-adiabatic testing system are described. The phase change characteristic of miniature Ga fixed-point is measured using this quasi-adiabatic testing system. The results show that the melting point of Ga fixed-point has strong linear relationship with the heating power. The linear fitting factor R2 is 0. 995 7. The lower the heating poweris, the closer to the standard temperature of Ga fixed-point it becomes. Further more, the repeatability of the melting points of Ga is better than 2 mK under the same quasi-adiabatic testing system.