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You searched on: Author: Daniel Sawyer

Displaying records 1 to 10 of 39 records.
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1. 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

2. 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

3. 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

4. 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

5. 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

6. POINT REMOVAL FOR FITTING SPHERES TO 3-D LASER SCANNER DATA
Published: 11/11/2014
Authors: Katharine M Shilling, Balasubramanian Muralikrishnan, Daniel S Sawyer
Abstract: The proliferation of laser scanners in a number of industries such as the metrology of large artifacts, digitization and reverse engineering, historical preservation and archiving has led to the need for documentary Standards to establish and com ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916460

7. A Proposed Interim Check for Field Testing a Laser Tracker‰s 3-D Length Measurement Capability Using a Calibrated Scale Bar as a Reference Artifact
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 8016
Published: 10/1/2014
Authors: Vincent D Lee, Christopher J Blackburn, Balasubramanian Muralikrishnan, Daniel S Sawyer, Mark Meuret, Aaron Hudlemeyer
Abstract: This paper describes a proposed interim check for field testing a laser tracker‰s 3-D length measurement capability using a calibrated scale bar as a reference artifact. The tests described here are constructed to be sensitive to uncompensated error ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916126

8. EVALUATION OF A LASER SCANNER FOR LARGE VOLUME COORDINATE METROLOGY ‹ A COMPARISON OF RESULTS BEFORE AND AFTER FACTORY CALIBRATION
Published: 10/1/2014
Authors: Massimiliano M. Ferrucci, Balasubramanian Muralikrishnan, Daniel S Sawyer, Steven David Phillips, Peter Petrov, Yuri Yakovlev, Andrey Astrelin, Spike Milligan, John Palmateer
Abstract: Large volume laser scanners are increasingly being used for a variety of dimensional metrology applications. Methods to evaluate the performance of these scanners are still under development and there are currently no documentary standards available. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915965

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. Ranging Performance Evaluation of a Laser Scanner
Published: 10/20/2013
Authors: Massimiliano M. Ferrucci, Balasubramanian Muralikrishnan, Christopher J Blackburn, Daniel S Sawyer, Steven David Phillips, Vincent D Lee, Peter Petrov, Yuri Yakovlev, Andrey Astrelin, Spike Milligan, John Palmateer
Abstract: Large volume laser scanners are used for a variety of purposes, including dimensional metrology of large artifacts, digitization and reverse engineering, as well as historical preservation and archiving. In evaluating the performance of laser sca ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914333



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