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You searched on: Author: Craig Shakarji

Displaying records 1 to 10 of 36 records.
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1. EVALUATION OF THE RANGE PERFORMANCE OF LASER SCANNERS USING NON-PLANAR TARGETS
Published: 11/1/2015
Authors: Prem Kumar Rachakonda, Balasubramanian Muralikrishnan, Craig M Shakarji, Vincent D Lee, Daniel S Sawyer
Abstract: 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 determinin ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=919240

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. Considerations for Design and In-Situ Calibration of High Accuracy Length Artifacts for Field Testing of Laser Trackers
Published: 3/1/2015
Authors: Aaron Hudlemeyer, Daniel S Sawyer, Christopher J. Blackburn, Vincent D Lee, Mark Meuret, Craig M Shakarji
Abstract: Interim testing of laser trackers can be problematic due to the lack of high precision, long length artifacts that maintain their calibrated lengths during measurement. Gravitational loading, fixturing forces, and changes in the atmospheric conditio ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916346

5. 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

6. 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

7. 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

8. An improved L1 based algorithm for standardized planar datum establishment
Published: 10/1/2014
Authors: Craig M Shakarji, Vijay Srinivasan
Abstract: This paper has two major goals. First, we present an algorithm for establishing planar datums suitable for a default in tolerancing standards. The algorithm is based on a constrained minimization search based on the L_1 (L1) norm after forming a conv ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916075

9. Common-Path Method for Laser Tracker Ranging Calibration
Published: 3/31/2014
Authors: Christopher J. Blackburn, Daniel S Sawyer, Craig M Shakarji
Abstract: We present an alternative to the back-to-back method of testing laser tracker ranging systems. Our approach uses a common air path for both the measurement and reference laser beams. This technique allows for more accurate determination of the refere ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914077

10. Metrological challenges introduced by new tolerancing standards
Published: 2/13/2014
Authors: Edward P Morse, Yue Peng, Vijay Srinivasan, Craig M Shakarji
Abstract: The recent release of ISO has provided designers with a richer set of specification tools for the size of part features, so that various functional requirements can be captured with greater fidelity [2]. However, these tools also bring new challenges ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916214



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  • SP 250-XX: Calibration Services
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