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Search Publications by: Patrick J. Abbott (Assoc)

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Displaying 1 - 25 of 48

Recommended practice for calibrating vacuum gauges of the ionization type

April 27, 2018
Author(s)
James A. Fedchak, Patrick J. Abbott, Jay H. Hendricks, Paul C. Arnold, Neil T. Peacock
This document represents a recommended practice for the calibration of ionization gauges using the comparison method. In this method, ionization gauges are compared to a working standard that has an SI traceable calibration. The ionization gauge is either

Milligram mass metrology using an electrostatic force balance

September 28, 2016
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 opportunity to realize mass at any scale using electrical metrology. We propose the use of an

Results from the Magnetic Suspension Mass Comparator for Vacuum-to-Air Mass Dissemination in Support of the Redefinition of the Kilogram

August 1, 2016
Author(s)
Corey A. Stambaugh, Eric C. Benck, Edward C. Mulhern, Patrick J. Abbott, Zeina J. Kubarych
Experiments to realize the new definition of the kilogram will be carried out in vacuum. NIST has developed a magnetic suspension mass comparator to disseminate the new definition to air. This paper details the current status of the system. This includes

PROGRESS ON MAGNETIC SUSPENSION FOR THE NIST VACUUM-TO-AIR MASS DISSEMINATION SYSTEM

September 3, 2015
Author(s)
Corey A. Stambaugh, Edward C. Mulhern, Eric C. Benck, Zeina J. Kubarych, Patrick J. Abbott
The redefined kilogram will be realized in vacuum and a method will be required to disseminate the standard to air. NIST has been developing a magnetic suspension system for this purpose. This paper discusses the progress to characterize and improve the

A constant from a mass, a mass from a constant

November 9, 2014
Author(s)
Jon R. Pratt, Stephan Schlamminger, David B. Newell, Leon S. Chao, Zeina J. Kubarych, Patrick J. Abbott, Yusi A. Cao, Frank C. Seifert, Darine El Haddad
NIST recently used a watt balance instrument known as NIST-3 to measure the Planck constant in terms of IPK with a relative uncertainty of approximately 45 parts in 10e9. Along the way to this new NIST value of h, the instrument was also employed to

Vacuum technology considerations for mass metrology

July 1, 2011
Author(s)
Patrick J. Abbott, Zeina J. Kubarych
Vacuum weighing of mass artifacts eliminates the necessity of air buoyancy correction and its contribution to the measurement uncertainty. Vacuum weighing is also an important process in the experiments currently underway for the redefinition of the SI

Safely mounting glass viewports to elastomer sealed vacuum flanges

June 17, 2010
Author(s)
Patrick J. Abbott, Brian R. Scace
Elastomer sealed vacuum flanges rely on specially sized elastomer O-rings and corresponding grooves to make an air-tight seal. Depending on the materials being sealed to one another, the O-ring/groove sealing mechanism may be designed for a specific