We presented a relationship between the temperature control and measurement stability limit and the temperature resolution,particularly for using rhodium-iron resistance thermometers and AC resistance bridges.Based on...We presented a relationship between the temperature control and measurement stability limit and the temperature resolution,particularly for using rhodium-iron resistance thermometers and AC resistance bridges.Based on this,temperature control was investigated and demonstrated in primary gas thermometry under various working conditions.With optimized parameters,micro-Kelvin level temperature control stability was realized in the temperature region from 5 K to 24.5 K.The temperature control stabilities are better than 8μK over 180 h with an integration time of 33.6 s in the concerned temperature range,closing to the limit that the sensors and the instruments can control and measure.These stabilities were significantly improved about(44±8)%at 24.5 K and(70±7)%at 5 K comparing with our previous work(Chen et al.,Cryogenics,2019,97:1–6).展开更多
基金supported by the National Key Research and Development Program of China(Grant No.2016YFE0204200)the National Natural Science Foundation of China(Grant No.51627809 and 52006231)+5 种基金the International Partnership Program of the Chinese Academy of Sciences(Grant No.1A1111KYSB20160017)the Scientific Instrument Developing Project of the Chinese Academy of Sciences(Grant No.ZDKYYQ20210001)the European Metrology Research Program(EMRP)Joint Research Project 18SIB02“Real K”the CAS Key Laboratory of Cryogenics,Technical Institute of Physics and Chemistry(Grant No.CRYOQN202110)supported by the project“15SIB02 InK 2”which has received funding from the EMPIR programme co-financed by the Participating States and from the European Union’s Horizon 2020 research and innovation programmethe funding provided by a Horizon 2020 Marie Sk?odowska Curie Individual Fellowship 2018(No.834024)。
文摘We presented a relationship between the temperature control and measurement stability limit and the temperature resolution,particularly for using rhodium-iron resistance thermometers and AC resistance bridges.Based on this,temperature control was investigated and demonstrated in primary gas thermometry under various working conditions.With optimized parameters,micro-Kelvin level temperature control stability was realized in the temperature region from 5 K to 24.5 K.The temperature control stabilities are better than 8μK over 180 h with an integration time of 33.6 s in the concerned temperature range,closing to the limit that the sensors and the instruments can control and measure.These stabilities were significantly improved about(44±8)%at 24.5 K and(70±7)%at 5 K comparing with our previous work(Chen et al.,Cryogenics,2019,97:1–6).
