Mass metrology

News and Updates

Artifacts, Begone! NIST Improves Its Flagship Device for Measuring Mass

January 18, 2023

In a brightly lit subterranean lab at the National Institute of Standards and Technology (NIST) sits a room-sized electromechanical machine called the NIST-4

NIST Researchers Link Cutting-Edge Gravity Research to Safer Operation of Construction Cranes

February 17, 2022

In the beginning, all that Stephan Schlamminger wanted to do was to write down an equation that would help him obtain a more precise value for G, the

Sneezes, Rain Clouds and Ink Jets: NIST Improves the Ability of Optical Microscopes to Measure the Volume of Microdroplets

December 20, 2021

Sneezes, rain clouds, and ink jet printers: They all produce or contain liquid droplets so tiny it would take several billion of them to fill a liter bottle

Projects and Programs

Metrology and Standards for Nanoscale Stress

Ongoing

Our objective is to develop accurate measurement methods for the nanoscale stress distributions and surface defects that control device performance and

Quantifying the environmental contributions to mass change

Ongoing

Since the inception of the SI system of units, physical mass artifacts have been disseminated in order to realize the unit of the kilogram, essential to a broad

Precision Electro-Mechanical Experiments (PREME)

Ongoing

The Precision Electro-Mechanical Experiments (PREME) program develops precision electro-mechanical measurements for fundamental traceability of the SI units and

Nanometrology: Composition and Structure of Nanomaterials

Ongoing

Advances in methods, instrumentation and analysis protocols are developed to enhance measurement science capabilities in nanomaterial elemental and

Publications

A Macroscopic Mass From Quantum Behavior In An Integrated Approach

December 10, 2022

Author(s)

Frank Seifert, Alireza Panna, Lorenz Keck, Leon Chao, Shamith Payagala, Dean G. Jarrett, Dipanjan Saha, Randolph Elmquist, Stephan Schlamminger, Albert Rigosi, David B. Newell, Darine El Haddad

The revision of the International System of Units (SI) on May 20th, 2019, has enabled new improved experiments to consolidate and simplify electrical and

Neutron Phase Contrast Imaging of PbWO4 Crystals for G Experiment Test Masses Using a Talbot-Lau Neutron Interferometer

November 25, 2022

Author(s)

Daniel S. Hussey, Vincent Lee, w snow, Kofi Assumin-Gyimah, Dipangkar Dutta

The use of transparent test/source masses can bene t future measurements of Newton's gravi- tational constant G. Such transparent test mass materials can enable

Proceedings of EUSPEN 2022

October 26, 2022

Author(s)

Sven Schulze, Kumar Arumugam, Rene Theska, Gordon A. Shaw

The 2019 redefinition of the kilogram in the International System of Units (SI) connects the unit of mass with Planck's constant (h) through electrical

Calculation of magnetic forces and torques on the Kibble coil

October 22, 2022

Author(s)

Stephan Schlamminger, Lorenz Keck, Frank Seifert, Leon Chao, Darine El Haddad, Shisong Li

Analytically the force and torques on a coil in a field of magnetic flux density can be calculated one of two ways. The line integral can be conducted along the