Leon Chao

Publications

Redetermination of the Gravitational Constant using the BIPM Torsion Balance

July 8, 2024

Author(s)

Stephan Schlamminger, Leon Chao, David B. Newell, Vincent Lee, Clive Speake

For the past several years, we have been using the torsion balance developed at the Bureau International des Poids et Mesures (BIPM) to measure the

Applications and Limitations of the Kibble-Robinson Theory

April 19, 2024

Author(s)

Lorenz Keck, Kumar Arumugam, Leon Chao, Zane Comden, John Dragenov, Frank Seifert, David B. Newell, Darine El Haddad, Stephan Schlamminger

Application of Electrical Standards to Torque Realization: A Device to Measure up to 1Nm

February 14, 2024

Author(s)

Zane Comden, Stephan Schlamminger, Frank Seifert, David B. Newell, Leon Chao

This paper describes the next generation prototype of the Electronic NIST Torque Realizer (ENTR) project. The first prototype version (ENTR-v1) has been able to

The design and performance of an electronic torque standard directly traceable to the revised SI

May 25, 2023

Author(s)

Zane Comden, John-Edward Draganov, Stephan Schlamminger, Frank Seifert, Charles Waduwarage Perera, David B. Newell, Leon Chao

The United States National Institute of Standards and Technology (NIST) has been developing a new device for primary standard realization of torque utilizing

Using the Kibble Principle for One-Step Traceability for Mass, Force, and Torque

May 8, 2023

Author(s)

Stephan Schlamminger, Leon Chao, Zane Comden, John-Edward Draganov, Thapelo Given Mametja

Many technologies contributed to the 2019 revision of the international system of units. Notable is a mechanical apparatus, the Kibble balance. It allows the

View more Publications

Patents (2018-Present)

Absolute Mass Balance

NIST Inventors

Leon Chao and Jon R. Pratt

An absolute mass balance determines an absolute mass of an object and includes: a dual diameter wheel including: a balance fulcrum; and a balance beam disposed on the balance fulcrum and including: a main mass arm and a counter mass arm; a main mass receiver that receives the object; a main magnet

View All Patents

Leon Chao (Fed)

Publications

Patents (2018-Present)