The Design of an Instrument to Realize Small Torque at NIST

Published

August 22, 2020

Author(s)

Leon S. Chao, Rafael Marangoni, Frank C. Seifert, Darine El Haddad, Jon R. Pratt, David B. Newell, Stephan Schlamminger

Abstract

After the recent redefinition of the International System of Units (SI), torque no longer needs to be traceable to a calibrated mass in a gravitational field suspended from a known lever arm and disseminated through a chain of torque transducers.An SI-traceable torque can be directly realized using the Kibble principle where a torque is generated by a calibrated electromagnetic transducer. Here, a set of theoretical designs fora new instrument aimed at direct realization of torque to 0.1%accuracy is analyzed and examined for feasibility. With careful attention to magnet design, a robust and easy to implement torque calibrator can be built.

Conference Dates

August 22-27, 2020

Conference Location

Denver, CO

Conference Title

NCSLI (National Conference of Standards Laboratories International) Workshop & Symposium

Pub Type

Conferences

Keywords

Torque metrology, Kibble balance, precisionengineering design

Citation

Chao, L. , Marangoni, R. , Seifert, F. , El, D. , Pratt, J. , Newell, D. and Schlamminger, S. (2020), The Design of an Instrument to Realize Small Torque at NIST, NCSLI (National Conference of Standards Laboratories International) Workshop & Symposium, Denver, CO (Accessed October 11, 2025)