Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Jon R. Pratt (Fed)

Dr. Pratt is a mechanical engineer and Chief of the Quantum Measurement Division of the Physical Measurement Laboratory (PML) at the National Institute of Standards and Technology (NIST).

Publications

The Design of an Instrument to Realize Small Torque at NIST

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

Contributions of precision engineering to the revision of the SI

Author(s)
Stephan Schlamminger, Harald Bosse, Horst Kunzmann, Jon R. Pratt, Ian Robinson, Michael de Podesta, Paul Shore, Paul Morantz
All measurements performed in science and industry are based on the International System of Units, the SI. It has been proposed to revise the SI following an

Milligram mass metrology using an electrostatic force balance

Author(s)
Gordon A. Shaw, Julian Stirling, John A. Kramar, Alexander D. Moses, Patrick J. Abbott, Richard L. Steiner, Andrew D. Koffman, Jon R. Pratt, Zeina J. Kubarych
Although mass is typically defined within the International System of Units (SI) at the Kilogram level, the pending redefinition of the SI provides an

Patents

Optomechnical Gravimeter

NIST Inventors
Jacob Taylor, Jon R. Pratt and
Patent Description Currently many space projects require, at their core, sensors capable of measuring spurious forces acting on the spacecraft with extremely high sensitivity at ng/√Hz levels and below, particularly for high accuracy navigation and drag-free flight. NIST has developed a novel and
Created August 27, 2019, Updated June 15, 2021