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Metrology

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Displaying 1676 - 1700 of 2718

High Strain Rate Tissue Simulant Measurements Using digital Image Correlation

June 1, 2009
Author(s)
Steven P. Mates, Richard L. Rhorer, Richard Everett, Kirth Simmonds, Amit Bagchi
Measuring the response of soft materials to high strain rate deformation is extremely challenging because of the difficulty of achieving dynamic equilibrium during high strain rate mechanical testing such as Kolsky bar testing. Digital image correlation

Calibration of Speed Enforcement Down-the-Road Radars

May 1, 2009
Author(s)
John R. Jendzurski, Nicholas G. Paulter Jr.
We examine the measurement uncertainty associated with different methods of calibrating the ubiquitous down-the-road (DTR) radar used in speed enforcement. These calibration methods include the use of audio frequency sources, tuning forks, a fifth wheel

Directions in Security Metrics Research

April 30, 2009
Author(s)
Wayne Jansen
More than 100 years ago, Lord Kelvin insightfully observed that measurement is vital to deep knowledge and understanding in physical science. During the last few decades, researchers have made various attempts to develop measures and systems of measurement

Reference Ballistic Chronograph

April 30, 2009
Author(s)
Nicholas G. Paulter Jr., Donald R. Larson
A ballistic chronograph with a measurement uncertainty of less than +/- 0.1 m/s has been designed, constructed and tested. Because of this low uncertainty, this chronograph can be used as a reference to calibrate and/or characterize the performance of

Three-Magon Splitting and Confluence Processes for Magnetostatic Backward Volume-Spin-Wave Excitations in Yttrium Iron Garnet Films

April 27, 2009
Author(s)
Pavel Kabos, Cesar O. Ordonez-Romero, Boris A. Kalinikos, Pavol Krivosik, Wei Tong, Carl E. Patton
Brillouin light scattering (BLS) has been used to observe and confirm the existence of nonlinear three magnon splitting and confluence processes for propagating spin waves in the magnetostatic backward volume wave (MSBVW) configuration. Wave vector and

EtherNet/IP Interoperability Recommendations

April 22, 2009
Author(s)
James D. Gilsinn, Kevin Knake
The EtherNet/IP interoperability recommendations are a result of work generated by the ongoing series of EtherNet/IP Implementors Workshops. The recommendations were created to promote EtherNet/IP device interoperability through product functionality

Reference Metrology in a Research Fab: The NIST Clean Calibrations Thrust

April 12, 2009
Author(s)
Ronald G. Dixson, Ndubuisi G. Orji, Joseph Fu, Thomas B. Renegar, Xiaoyu A. Zheng, Theodore V. Vorburger, Albert M. Hilton, Marc J. Cangemi, Lei Chen, Michael A. Hernandez, Russell E. Hajdaj, Michael R. Bishop, Aaron Cordes
In 2004, the National Institute of Standards and Technology (NIST) commissioned the Advanced Measurement Laboratory (AML) – a state-of-the-art, five-wing laboratory complex for leading edge NIST research. The NIST NanoFab – a 1765 m2 (19,000 ft2) clean

An Independent Measurement System for Testing Automotive Crash Warning Systems

April 2, 2009
Author(s)
Sandor S. Szabo, Joseph A. Falco, Richard J. Norcross
This report describes the National Institute of Standards and Technology's role in the Integrated Vehicle-Based Safety Systems (IVBSS) program, a four-year safety initiative sponsored by the United States Department of Transportation (U.S. DOT) to develop

Sensitivity of SEM width measurements to model assumptions

March 31, 2009
Author(s)
John S. Villarrubia, Zejun Ding
The most accurate width measurements in a scanning electron microscope (SEM) require raw images to be corrected for instrumental artifacts. Corrections are based upon a physical model that describes the sample-instrument interaction. Models differ in their

Report on Acceleration Comparison SIM.AUV.V-K1 - Draft B

March 20, 2009
Author(s)
David J. Evans, Adriana Hornikova, Stefan D. Leigh, Andrew L. Rukhin, William E. Strawderman
The first regional key comparison in vibration conducted under the auspices of the Inter-American System of Metrology (SIM) was begun in 1996. The comparison was registered with the International Bureau of Weights and Measures (BIPM) through the

Polymerization Stress Development in Dental Composites: Effect of Cavity Design Factor

March 13, 2009
Author(s)
Joseph M. Antonucci, Anthony A. Giuseppetti, Justin N. O'Donnell, Gary E. Schumacher, Drago Skrtic
Objective: To assess the effect of the cavity design factor (C-factor) on polymerization stress development (PSD) in resin composites. Methods: An experimental resin (BT resin) was prepared, which contained 2,2-bis[p-(2 hydroxy-3 -methacryloxypropoxy

Energy Efficient Lighting - Solid State Luminaires (Handbook 150-1A)

February 27, 2009
Author(s)
C Cameron Miller, Lawrence I. Knab, Ambler Thompson, Jon M. Crickenberger
NIST Handbook 150-1A presents technical requirements and guidance for the accreditation of laboratories under the National Voluntary Laboratory Accreditation Program (NVLAP) Energy Efficient Lighting/Solid State Lighting program. It is intended for

SRM Spotlight

February 18, 2009
Author(s)
Regina R. Montgomery
The SRM Spotlight is a newsletter published by the Measurement Services Division for users of NIST standard reference materials. The Spotlight announces new reference materials and provides information about their use. In addition, this newsletter contains

ASME B89.4.19 Performance Evaluation Tests and Geometric Misalignments in Laser Trackers

January 30, 2009
Author(s)
Balasubramanian Muralikrishnan, Daniel S. Sawyer, Christopher J. Blackburn, Steven D. Phillips, Bruce R. Borchardt, William T. Estler
Small and unintended offsets, tilts, and eccentricity of the mechanical and optical components in laser trackers introduce systematic errors in the measured spherical coordinates (angles and range readings), and possibly in the calculated lengths of
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