NPL Kibble balance bifilar coil design and evaluation. XXII IMEKO World Congress, Belfast, 3 - 6 September 2018

摘要

A novel design of Kibble (watt) balance has been designed and is being constructed at the National Physical Laboratory. Lheory predicts that this type of balance will be simpler to construct and operate due to the removal of many of the alignment sensitivities present in existing balances. The balance uses a compact twisted pair coil in both the weighing and moving modes. This paper describes the design and manufacture of the coil and presents results of outgassing measurements made on the coil using a vacuum mass comparator.