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Metrology

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Displaying 776 - 800 of 2718

Hydrogen Field Test Standard: Laboratory and Field Performance

November 10, 2015
Author(s)
Jodie G. Pope, John D. Wright
The National Institute of Standards and Technology (NIST) developed a prototype field test standard (FTS) that incorporates three test methods that could be used by state weights and measures inspectors to periodically test retail hydrogen dispensers, much

Applications of the Spline Filter for Areal Filtration

November 4, 2015
Author(s)
D Ott, Hao H. Zhang, Daniel B. Ott, Wei Chu, Jun-Feng Song
This paper proposes a general use areal isotropic spline filter. This new areal spline filter can achieve isotropy by approximating the transmission characteristic of the Gaussian filter. It can also eliminate the effect of void areas using a weighting

Electrostatic Microprobe for Determining Charge Domains on Surfaces

November 2, 2015
Author(s)
Robert A. Fletcher
The electrostatic microprobe is a laboratory constructed instrument with the design purpose to measure charge content on wipe and various control surfaces. The device is constructed on an optical microscope platform, with a computer automated XY stage

Evaluation of the Range Performance of Laser Scanners Using Non-planar Targets.

November 1, 2015
Author(s)
Prem K. Rachakonda, Balasubramanian Muralikrishnan, Craig M. Shakarji, Vincent D. Lee, Daniel S. Sawyer
The Dimensional Metrology Group (DMG) at the National Institute of Standards and Technology (NIST) is supporting the development of documentary standards for performance evaluation of Laser scanners. This evaluation could be performed by determining the

Design and calibration of an artifact for evaluating laser scanning articulating arm CMMs used for measuring complex non-concurrent surfaces

October 30, 2015
Author(s)
Vincent D. Lee, Steven D. Phillips, Craig M. Shakarji, Jeffrey Hosto, Jeffrey Huber, Gillich Barbara
Dimensional metrology is a foundational science finding applications throughout modern technology, including the testing of human-worn body armor designed to mitigate damage from kinetic projectiles fired from small arms. We describe the design and

Millimeter-Wave Near-Field Measurements Using Coordinated Robotics

October 29, 2015
Author(s)
Joshua A. Gordon, David R. Novotny, Michael H. Francis, Ronald C. Wittmann, Alexandra Curtin, Miranda L. Butler, Jeffrey R. Guerrieri
The National Institute of Standards and Tech- nology (NIST) recently developed a new robotic scan- ning system for performing near-field measurements at millimeter-wave frequencies above 100 GHz, the CROMMA (Configurable Robotic Millimeter-Wave Antenna)

Double-integrating-sphere system at the National Institute of Standards and Technology in support of measurement standards for the determination of optical properties of tissue-mimicking phantoms

October 27, 2015
Author(s)
Paul Lemaillet, Jeeseong C. Hwang, David W. Allen
There is a need for a common reference point that will allow for the comparison of the optical properties of tissue mimicking phantoms. This paper provides a brief review of the methods that have been used to measure tissue mimicking phantoms. The review

A Sensor-Based Method for Diagnostics of Machine Tool Linear Axes

October 23, 2015
Author(s)
Gregory W. Vogl, Brian A. Weiss, Alkan Donmez
A linear axis is a vital subsystem of machine tools, which are vital systems within many manufacturing operations. When installed and operating within a manufacturing facility, a machine tool needs to stay in good condition for parts production. All

Digital Phantoms Generated by Spectral and Spatial Light Modulators

October 21, 2015
Author(s)
Bonghwan Chon, Fuyuki Tokumasu, Ji Y. Lee, David W. Allen, Joseph P. Rice, Jeeseong Hwang
A hyperspectral image projector (HIP) based on liquid crystal on silicon (LCoS) spatial light modulators (SLMs) is explained and demonstrated to generate 3D spectral data cubes. The HIP- constructed data cubes are 3D images of the spatial distribution of

A LEGO Watt Balance, An apparatus to demonstrate the definition of mass based on the new SI

October 20, 2015
Author(s)
Leon S. Chao, Stephan Schlamminger, David B. Newell, Jon R. Pratt, Georgio A. Sineriz, Frank C. Seifert, Darine El Haddad, Yusi A. Cao, Xiang Zhang
A redefinition of our system of units, the SI, is currently being discussed and its implementation is expected in 2018. With the redefinition, the current base units will no longer be required and all units henceforth will be based upon fixed values of

The JAR Extractor: a Soxhlet Modified Into a Large-Diameter Wafer Washer

October 20, 2015
Author(s)
Richard J. Sheridan, Aaron V. Kirchhoff
A closed-atmosphere, solvent-recirculating, large diameter wafer washer was fabricated for neutron reflectivity research at the National Institute of Standards and Technology. Manufacturing feasibility for the public sector was increased by simplicity in

The NIST IAD Data Science Research Program

October 19, 2015
Author(s)
Bonnie J. Dorr, Peter C. Fontana, Craig S. Greenberg, Mark A. Przybocki, Marion Le Bras, Cathryn A. Ploehn, Oleg Aulov, Martial Michel, Edmond J. Golden III, Wo L. Chang
We examine foundational issues in data science including current challenges, basic research questions, and expected advances, as the basis for a new Data Science Research Program and evaluation series, introduced by the Information Access Division of the

A Single-Pixel Touchless Laser Tracker Probe

October 15, 2015
Author(s)
Josh Gordon, David R. Novotny, Alexandra Curtin
We have developed a laser tracker probe, the Pixel Probe, that does not require physically contacting the object one is measuring and which has 3D spatial resolution of about 25 μm (in x,y,z) in the current configuration. This touchless laser tracker probe

Antenna Measurement Implementations and Dynamic Positional Validation Using a Six Axis Robot

October 11, 2015
Author(s)
David R. Novotny, Josh Gordon, Michael H. Francis, Ronald C. Wittmann, Alexandra Curtin, Jeffrey R. Guerrieri
We have performed spherical and extrapolation scans of two antennas at 118 GHz using a commercial 6-axis robot. Unlike spherical scanning, linear extrapolations do not precisely conform to the native circular movement of the individual robot axes. To

NIST Micronutrients Measurement Quality Assurance Program (Summer 2014 Comparability Studies): Results for Round Robin LXXVI Fat-Soluble Vitamins and Carotenoids in Human Serum and Round Robin 41 Ascorbic Acid in Human Serum

September 29, 2015
Author(s)
Jeanice M. Brown Thomas, David L. Duewer
The National Institute of Standards and Technology coordinates the Micronutrients Measurement Quality Assurance Program (MMQAP) for laboratories that measure fat- and water-soluble vitamins and carotenoids in human serum and plasma. This report describes
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