Cu-ETP等温压缩系数原位实验测量研究  

Study on In-situ Experimental Measurement of the Isothermal Compressibility of Cu-ETP

作　　者：杨添通 宋耀楠 孔祥杰 张海洋 高波[1,2] PITRE Laurent YANG Tiantong;SONG Yaonan;KONG Xiangjie;ZHANG Haiyang;GAO Bo;PITRE Laurent(TIPC-LNE Joint Laboratory on Cryogenic Metrology Science and Technology,Technical Institute of Physics and Chemistry(TIPC),Chinese Academy of Science(CAS),Beijing 100190,China;Key Laboratory of Cryogenics,Technical Institute of Physics and Chemistry(TIPC),Chinese Academy of Sciences(CAS),Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;Laboratoire national de métrologie et d'essais-Conservatoire national des arts et métiers(LNE-Cnam),La Plaine-Saint Denis F93210,France)

机构地区：[1]中国科学院理化技术研究所,中法低温计量科学与技术国际联合实验室,北京100190 [2]中国科学院理化技术研究所,中国科学院低温工程学重点实验室,北京100190 [3]中国科学院大学,北京100049 [4]法国国家计量院-法国国立科学技术与管理学院,法国拉普莱纳-圣德尼F93210

出　　处：《真空与低温》2023年第4期373-378,共6页Vacuum and Cryogenics

基　　金：国家重点研发计划(2022YFE0210200);国家自然科学基金(52006231、52125602);中国科学院资助项目(ZDKYYQ20210001、1A1111KYSB20210015);北京市科技计划项目(Z221100002722005);中国科学院低温工程学重点实验室青年科技创新项目(CRYOQN202110);中国科学院青年创新促进会资助项目(2022028)。

摘　　要：电解精炼韧铜(Cu-ETP)通常用于制作基准级温度计中的核心部件微波谐振腔,其等温压缩系数对高准确度的热力学温度测量至关重要。但由于缺乏Cu-ETP在低温下的相关物性数据,常用高导无氧铜(OFHC)的等温压缩系数来近似Cu-ETP的等温压缩系数。为了获得Cu-ETP等温压缩系数的原位实验测量结果,在定压气体折射率基准级温度计实验系统的基础上,采用多模式微波谐振法测得了氖三相点(24.5561 K)处Cu-ETP的等温压缩系数,并计算了其不确定度。最终结果与通过间接计算得到的同温度下OFHC等温压缩系数之间具有较好的一致性且不确定度水平相当。参考氖三相点处Cu-ETP等温压缩系数的测量结果,获得了5~24 K温区内Cu-ETP等温压缩系数外推值。极低温区Cu-ETP等温压缩系数原位测量结果和外推计算结果可为热力学温度测量、气体基本热物性测量等提供参考数据。Electrolytic Though Pitch Copper(Cu-ETP)is often used to fabricate microwave resonator,which is the core component of primary thermometers.Its isothermal compressibility is very important for high accuracy thermodynamic temperature measurement.Due to the lack of physical property data of Cu-ETP at cryogenic temperature,the isothermal compressibility of Oxygen-Free High-Conductivity copper(OFHC)is often used to approximate the isothermal compressibility of Cu-ETP.In order to obtain the in-situ experimental measurement results of the isothermal compressibility of Cu-ETP,the isothermal compressibility of Cu-ETP at the triple point of neon(24.5561 K)is measured using the multi-mode microwave resonance method based on the measurement system of single-pressure refractive-index gas thermometry,and the uncertainty is calculated.The final result is in good agreement with the OFHC isothermal compressibility obtained by indirect calculation method,and the uncertainty level is similar.A set of extrapolated values of Cu-ETP isothermal compressibility in the temperature range of 5 K to 24 K is obtained by referring to the isothermal compressibility of Cu-ETP measured in-situ at the triple point of neon.The results can provide reference data for thermodynamic temperature measurement and basic thermal properties measurement of gas in cryogenic temperature region.

关 键 词：基准级温度计 Cu-ETP 等温压缩系数 准球形谐振腔 

分 类 号：O514.2[理学—低温物理]