集成量子电阻标准的氦气冷却低温电流比较仪
Helium-Gas-Cooled Cryogenic Current Comparator Integrated with a Quantum Resistance Standard
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中文总结 AI 辅助
本研究开发了集成量子霍尔电阻器件的氦气冷却低温电流比较仪系统，其电阻测量性能与液氦冷却系统相当，氦气消耗更低，不确定度达nΩ/Ω量级，可用于精密电阻比测量。
中文摘要 AI 辅助
我们报道了一种用于精密电阻测量的无制冷剂低温电流比较仪（CCC）系统。研制了氦气腔室并将其安装在配备脉冲管制冷机的无制冷剂稀释制冷机的4K级上，CCC探头置于该腔室内，通过作为热交换介质的氦气冷却。该氦气冷却CCC的计量性能通过精密电阻比测量进行评估，发现其性能与液氦冷却下的性能相当。还将量子霍尔电阻（QHR）器件集成到同一制冷机中，实现QHR/100Ω电阻比测量。在100秒的平均时间内，A型不确定度达到1nΩ/Ω水平，所得电阻比测量结果与传统液氦基测量结果在几nΩ/Ω水平上吻合良好。该系统在每个热循环消耗少于1升氦气的同时提供该水平的测量性能。
英文摘要
We report a cryogen-free cryogenic current comparator (CCC) system for precision resistance measurements. A helium-gas chamber was developed and installed on the 4 K stage of a cryogen-free dilution refrigerator equipped with a pulse-tube cryocooler. The CCC probe was housed in this chamber and was cooled through helium gas serving as a heat exchange medium. The metrological performance of this helium-gas-cooled CCC was evaluated through precision resistance-ratio measurements and found to be comparable to that obtained under liquid-helium cooling. A quantum Hall resistance (QHR) device was also integrated into the same refrigerator, enabling QHR/100~$Ω$ resistance-ratio measurements. The type-A uncertainty reached the 1~n$Ω$/$Ω$ level within an averaging time of 100~s, and the resulting resistance-ratio measurements agreed well with conventional liquid-helium-based measurements at the level of a few n$Ω$/$Ω$. The system provides this level of measurement performance while consuming less than 1~L of helium gas per thermal cycle.
发表机构
- National Institute of Advanced Industrial Science and Technology (AIST), National Metrology Institute of Japan (NMIJ)（日本国立产业技术综合研究所（AIST），日本国家计量院（NMIJ））
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