COMPARISON OF NIST SI FORCE SCALE TO NPL SI MASS SCALE

摘要

Recent advances in device manufacture and object manipulation at the micro- and nanometre level have intensified the need for quantitative understanding of forces acting at this scale. Impacted industries include automotives, pharmaceuticals and communications. To meet this need, several major national metrology institutes (NMIs) have developed specialist balances to measure low forces traceable to the International System of Units (SI). These include efforts at the National Institute of Standards and Technology (NIST) [1], National Physical Laboratory (NPL) [2], Physikalisch-Technische Bundesanstalt (PTB) [3] and Korea Research Institute of Standards and Science (KRISS) [4]. Forces measured by the first three are ultimately traceable through electrical and length units, as opposed to the International Prototype Kilogram (IPK).