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The Design of an Instrument to Realize Small Torque at NIST

Published

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

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 April 22, 2021)
Created August 21, 2020, Updated November 26, 2020