发展适用于海洋温区-5～35℃新的温度固定点已成为提高海洋温度测量水平的重要手段。针对镓基合金无法覆盖的海洋温区中更低的温度范围,以高纯度十三烷和十四烷为研究对象,探索其成为固定点的可行性;调节不同预热温度和熔化温度对其相变特性进行研究。结果表明:十三烷熔化温坪可持续35h以上,且温坪复现性优于1mK;十四烷熔化温坪可持续45h以上,温坪复现性优于1mK,两者皆具备成为温度固定点的可能性,该研究结果为海洋温区固定点的补充提供了实验数据支撑。
Abstract
The development of a new temperature fixed point suitable for the ocean temperature zone -5～35℃ has become an important means to improve the level of ocean temperature measurement. Aiming at the lower temperature range of ocean temperature zone which gallium base alloy cannot cover, the feasibility of using high purity tridecane and tetradecane as fixed points was explored. The phase transition characteristics were studied by adjusting different preheating and melting temperatures. The results show that the melting temperature plateau of tridecane can last for more than 35h, and the recurrence level of the temperature plateau is better than 1mK. The melting temperature plateau of tetradecane can last for more than 45h, and the recurrence of the temperature plateau is better than 1mK. Both of them have the possibility of becoming the fixed point of temperature. The research results provide supplementary experimental data support for the fixed point of ocean warm zone.
关键词
计量学;海洋温度;次级固定点;温坪复现性 /
有机物 /
十三烷 /
十四烷
Key words
metrology /
ocean temperature /
secondary fixed point /
recurrence of temperature plateau;organics /
tridecane /
tetradecane
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基金
国家重点研发计划(2022YFF0607500/2022YFF0607501)
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