While the optimal overall design of the balance is still unclear, there seems to be convergence on what is the best source of the magnetic field. The very first balance built by B. Kibble used a conventional electromagnet [25]. A balance made later at NIST featured a superconducting magnet ...
Kibble balanceprecision engineering designA tabletop-sized Kibble balance (KIBB-g1) designed to directly realize mass at the gram-level range with uncertainties on the order of parts in 10(6) has been developed at the National Institute of Standards and Technology (NIST). The masses of a ...
但是kibble秤有个乐高版本,也是国际计量局(nist)的人设计的,有论文。里面提到说,虽然乐高版本的kibble秤没有像大型版本那样利用约瑟夫森效应和量子霍尔效应来产生可以用h直接表示的电压和电流(电阻),但因为电学单位一直用的是所谓传统电学单位,然后根据这个传统电学单位和国际单位制的一些差值,一样可以测量普朗克常量。这...
To meet that need, NIST scientists have devised the Kibble Dynamic Force Reference (KDFR), a traceable dynamic force source based on the same principle used in a Kibble balance to generate an exactly known static force to counterbalance the weight of an unknown mass. By contrast, the patented...
The magnet system in a Kibble balance and the coil-current effect. (a) presents the major elements in the fourth generation Kibble balance experiment at NIST. The left subplot of (b) is the sectional view of a typical permanent magnet system with symmetry, where the color map denotes the ...
This article explains the Kibble balance, its role in the redefinition of the unit of mass, and attempts an outlook of the future.Stephan SchlammingerDarine HaddadNIST 100 Bureau Drive Gaithersburg MD 20899 USAComptes rendus. Physique