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Displaying 3151 - 3175 of 4199

Ultrafast Laser Eyewear Protection: Measurements and Precautions

September 25, 2017
Author(s)
Christopher J. Stromberg, Joshua A. Hadler, Brian Alberding, Edwin J. Heilweil
Ultrafast laser systems are becoming more widespread throughout the research and industrial communities yet eye protection for these high power, bright pulsed sources still require scrupulous characterization and testing before use. Femtosecond lasers

A Re-Examination of a Specific Surface Area Research Material

February 19, 2017
Author(s)
Dennis B. Minor
Specific surface area(SSA) analysis is one of the most common, quick, and inexpensive techniques used in analytical laboratories to characterize a variety of solid materials using a variety of gases. The technique is not labor intensive, can yield results

Report on the May 2016 ASTM E57.02 instrument runoff at NIST, Part 1 Background information and key findings

October 19, 2016
Author(s)
Balasubramanian Muralikrishnan, Prem K. Rachakonda, Katharine M. Shilling, Vincent D. Lee, Christopher J. Blackburn, Daniel S. Sawyer, Geraldine S. Cheok, Luc Cournoyer
There is ongoing activity within ASTM E57.02 working group WK43218 [1] to develop a documentary standard for point-to-point distance performance evaluation of 3D imaging systems. The Dimensional Metrology Group (DMG) at the National Institute of Standards

An algorithm for compensation of short-period errors in optical encoders

September 24, 2015
Author(s)
Marcus H. Mendenhall, Donald A. Windover, Albert Henins, James P. Cline
We present a simple way to collect data from an optical position or angle encoder with a readout which interpolates values between the optical features, and to process this data set so as to determine the short-range errors which arise from an

Navigation Performance Evaluation for Automated Guided Vehicles

May 12, 2015
Author(s)
Roger V. Bostelman, Tsai Hong Hong, Geraldine S. Cheok
Automatic guided vehicles (AGVs), an industrial form of mobile robot, typically navigate using a central computer commanding AGV movement on predefined paths. Although, how well they follow these paths is less defined in research articles and their

The Effect of Turbulence on a Multi-Hole Pitot Calibration

June 10, 2013
Author(s)
Christopher J. Crowley, Iosif I. Shinder, Michael R. Moldover
Abstract- Accurate calibrations of multi-hole Pitot tubes require thousands of measurements spanning ranges of the fluid’s velocity, and the pitch and yaw angles. When calibrating a commercially-manufactured multi-hole Pitot tube in NIST’s low-turbulence

Standard Reference Materials for Food Analysis

March 21, 2013
Author(s)
Melissa M. Phillips, Katherine E. Sharpless, Stephen A. Wise
Well-characterized reference materials with assigned concentrations of nutrients are needed as matrix-matched controls for analytical measurements to assist food manufacturers in quality control and facilitate compliance with nutritional labeling laws. The

Ultra-Precision Linear Motion Metrology

June 23, 2010
Author(s)
Ronnie R. Fesperman Jr., M A. Donmez, Shawn P. Moylan
Many new emerging applications of nanotechnologies require the use of compact precision linear translation stages that have positioning resolution on the order of a nanometer and an exceptionally long range of motion on the order of tens of millimeters

Evaluation of Oral Fluid Testing Devices

April 1, 2009
Author(s)
Lorna T. Sniegoski, Jocelyn L. Prendergast, Michael J. Welch, Alim A. Fatah, M Gackstetter, R. Q. Thompson
Several point-of-collection (POC) devices for detection of drugs of abuse in oral fluid were studied. The ability of the devices to meet the manufacturers' claims and their practical application to detection of drugs of abuse at low concentrations in oral

Holmium Oxide Glass Wavelengths Standards

January 1, 2008
Author(s)
David W. Allen
Holmium oxide glass has been used as a wavelength standard for over four decades. These standards have shown very little variation from batch to batch and from one manufacturer to another. NIST has certified and recertified holmium oxide glass samples for

Securing Radio Frequency Identification (RFID) Systems

May 17, 2007
Author(s)
Karen A. Scarfone
Radio frequency identification (RFID) is a form of automatic identification and data capture technology that uses electric or magnetic fields at radio frequencies to transmit information. An RFID system can be used to identify many types of objects, such

Should You Be Concerned with Software Measurement Uncertainty?

August 1, 2003
Author(s)
Craig M. Shakarji, J D. Raffaldi
The contribution of software to the uncertainty of measurements is an important but often overlooked aspect of uncertainty evaluations. In coordinate metrology, software is often relied upon for complicated fitting of data, filtering, calibrations, and

An Open Framework for the Assembly of Micro- and Nano-Scale Artifacts

June 1, 2003
Author(s)
Shaw C. Feng, Yung-Tsun Lee, Kevin W. Lyons
The design and manufacture of miniature devices have been increasing in both research laboratories and industry. The sizes of the devices continue to decrease to the nanometer scale. At the same time, the complexity of those devices has increased. To
Displaying 3151 - 3175 of 4199
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