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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Preliminary Planck Constant Measurements in the UME Kibble Balance
摘要： This paper describes the measurement procedure of the UME oscillating-magnet Kibble balance and gives details of the preliminary Planck constant measurements on the trial version. The value of the Planck constant determined with this apparatus is (cid:2190)/(cid:2190)(cid:2786)(cid:2777) = (cid:2778). (cid:2777)(cid:2777)(cid:2777)(cid:2777)(cid:2777)(cid:2781) with a relative standard uncertainty of 6 ppm.
关键词： watt balance,Planck constant,Measurement,Kibble balance,SI units
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - The Simulations of the Effect of the External Field in the Joule Balance
摘要： Due to the movement of the main magnet, the effect of the external field is a critical problem in the joule balance. The FEM simulations of the external field both in the electromagnet system and permanent magnet system are performed in this paper. The results show that although the error caused by the external field is much smaller in the permanent magnet system than that in the electromagnet system, it still needs to be further reduced. More efficient solutions should be considered to eliminate the effect of the external field when the permanent magnet system is used.
关键词： external field,FEM simulation,Kibble balance,joule balance,the Planck constant
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Evaluating the Performances of an Operational Absolute Quantum Gravimeter
摘要： The Absolute Quantum Gravimeter (AQG) is an industry-grade gravimeter measuring g with laser-cooled atoms, that has been developed by Muquans in close collaboration with RESIF (the French Seismologic and Geodetic Network, [2]) and the LNE-SYRTE laboratory. This paper reports on the evaluation of the first unit of the AQG and in particular on a statistical uncertainty on the measurement of g better than 1.10-8 m/s2 that has been reached in various types of environment and for month-long continuous measurements. The relevance of the AQG for a use in metrological laboratories is also discussed.
关键词： Gravimetry,quantum interferometry,absolute gravimeter,Kibble balance,cold atoms,Watt balance
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Developing the Next Generation of NPL Kibble Balances
摘要： NPL is building a next generation Kibble balance to encourage more widespread primary realisations of the kilogram following the expected revision of the SI in 2019. The new balance does not require careful alignment of the coil and magnet and is aimed at a relative standard uncertainty of 2 × 10?8. This paper describes progress on the development of the two technology demonstrator instruments which will guide the design of the next generation of Kibble balances at NPL.
关键词： SI redefinition,watt balance,Planck constant,kilogram,Kibble balance,SI units
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - The Design and Development of a Tabletop Kibble Balance at NIST
摘要： A global paradigm shift to redefine the International System of Units (SI) from a system based on seven fundamental units to seven fundamental constants is well under way. More specifically, the unit of mass, the kilogram, will be realized via a fixed value of the Planck constant h and a Kibble balance (KB) serves as a method of achieving this. Over the past few decades, national metrology institutes around the world have invested in developing KBs, the majority aimed at realizing the unit of mass at the 1-kg level with uncertainties on the order of a few parts in 108. However, upon fixing the Planck constant, mass can be directly realized at any level, deeming the kilogram only a historically unique benchmark. At the National Institute of Standards and Technology (NIST), a tabletop-sized Kibble balance (KIBB-g1) designed to operate at the gram-level range with uncertainties on the order of a few parts in 106 is currently under development.
关键词： Kibble balance,Mass metrology,precision engineering design
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - NIST Kibble Balance Performance
摘要： The fourth generation Kibble balance at the National Institute of Standards and Technology (NIST) has been operational and used to measure the value of the Planck constant from Fall 2015 to Spring 2017. Since then, researchers have been working on upgrades and checking the robustness of the experiment in preparation for the redefinition of the SI.
关键词： Kibble balance,Planck constant,redefinition of the SI,mass metrology
更新于2025-09-10 09:29:36