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You searched on: Author: steven phillips

Displaying records 1 to 10 of 68 records.
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1. Laser Trackers for Large Scale Dimensional Metrology: A Review
Published: 3/25/2016
Authors: Balasubramanian Muralikrishnan, Steven David Phillips, Daniel S Sawyer
Abstract: Thirty years since their invention, laser trackers are now recognized as the measurement tool of choice in the manufacture and assembly of large components. While their general design, i.e., a ranging unit on a two-axis gimbal, has not changed signif ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918617

2. Design and calibration of an artifact for evaluating laser scanning articulating arm CMMs used for measuring complex non-concurrent surfaces
Published: 10/30/2015
Authors: Vincent D Lee, Steven David Phillips, Craig M Shakarji, Jeffrey Hosto, Jeffrey Huber, Gillich Barbara
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=919256

3. Understanding the ramifications of important proposed changes to decision rules in three standards within ISO and ASME
Published: 7/31/2015
Authors: Craig M Shakarji, Steven David Phillips
Abstract: Decision rules define how measurement uncertainty is used (in conjunction with measured values and specification zones) to make acceptance or rejection decisions of products. Decision rule changes that are being proposed in key standards,some of whic ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=919020

4. Challenges to the use of the GUM
Published: 7/15/2015
Author: Steven David Phillips
Abstract: Presentation at the BIPM on (1) Issues with the uncertainty evaluation associated with the calibration of indicating instruments; and (2) the growing problem with ,outlier rejectionŠ in measurements with measurands defined by ,extreme valuesŠ
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918902

5. Volumetric Performance Evaluation of a Laser Scanner Based on Geometric Error Model
Published: 1/5/2015
Authors: Balasubramanian Muralikrishnan, Massimiliano M. Ferrucci, Daniel S Sawyer, Grant Gerner, Vincent D Lee, Christopher J Blackburn, Steven David Phillips, Yuri Yakovlev, Andrey Astrelin, Spike Milligan, John Palmateer
Abstract: We discuss a geometric error model for those large volume laser scanners that have the laser source and a spinning prism mirror mounted on a platform that can rotate about the vertical axis. We describe the terms that constitute the model, address th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916328

6. In-situ Temperature Calibration Capability for Dimensional Metrology
Published: 12/15/2014
Authors: Prem Kumar Rachakonda, Daniel S Sawyer, Balasubramanian Muralikrishnan, Christopher J Blackburn, Craig M Shakarji, Gregory F Strouse, Steven David Phillips
Abstract: The Dimensional Metrology Group (DMG) at the National Institute of Standards and Technology (NIST) has developed a new in-situ temperature calibration system. This paper discusses the system components, an in-situ calibration procedure, the uncer ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=919577

7. In-situ Temperature Calibration Capability for Dimensional Metrology
Published: 12/1/2014
Authors: Prem Kumar Rachakonda, Daniel S Sawyer, Balasubramanian Muralikrishnan, Christopher J Blackburn, Craig M Shakarji, Gregory F Strouse, Steven David Phillips
Abstract: The Dimensional Metrology Group (DMG) at the National Institute of Standards and Technology (NIST) has the capability to perform large range dimensional measurements in a facility, called the Tape Tunnel. The Tape Tunnel is equipped with a 60 m l ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915733

8. A Method of Determining Sphere Center to Center Distance Using Laser Trackers For Evaluating Laser Scanners.
Published: 11/11/2014
Authors: Prem Kumar Rachakonda, Balasubramanian Muralikrishnan, Vincent D Lee, Daniel S Sawyer, Steven David Phillips, John Palmateer
Abstract: The Dimensional Metrology Group (DMG) at the National Institute of Standards and Technology (NIST) is involved in the development of documentary standards for volumetric performance evaluation of laser scanners. Typical evaluation of these scanne ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916458

9. Laser scanner two-face errors on spherical targets
Published: 11/11/2014
Authors: Balasubramanian Muralikrishnan, Katharine M Shilling, Daniel S Sawyer, Prem Kumar Rachakonda, Vincent D Lee, Steven David Phillips, Geraldine S Cheok, Kamel S Saidi
Abstract: Geometric misalignments within the construction of a laser scanner such as offsets, tilts, and eccentricities, result in systematic errors in the measured point coordinates (range and angles). Many of these sources of error are sensitive to two-face ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916435

10. Evaluating CT for Metrology: The Influence of Material Thickness on Measurements
Published: 10/7/2014
Authors: Joseph Schlecht, Eric Ferley, Shaun COUGHLIN , Steven David Phillips, Vincent D Lee, Craig M Shakarji
Abstract: X-ray imaging provides a non-destructive means to measure internal features of a workpiece, and CT offers unique capabilities for internal measurements in 3-D. However, due to the computational nature of CT and its indirect measurement process, asses ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916961



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