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Author: Daniel Sawyer

Displaying records 1 to 10 of 33 records.
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1. 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

2. 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

3. 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

4. In-situ Temperature Calibration Capability for Dimensional Metrology
Published: 7/28/2014
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

5. 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

6. 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

7. VOLUMETRIC PERFORMANCE EVALUATION OF A LASER SCANNER
Published: 10/20/2013
Authors: Balasubramanian Muralikrishnan, Massimiliano M. Ferrucci, Daniel S Sawyer, Grant Gerner, Vincent D Lee, Christopher J Blackburn, Steven David Phillips, Peter Petrov, Yuri Yakovlev, Andrey Astrelin, Spike Milligan, John Palmateer
Abstract: There are several sources of error in a laser scanner measurement. The optical and material properties of the target, the shape, form, surface texture, color, reflectivity, and orientation of the target in space, environmental effects, etc., all cont ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914153

8. Assessing Ranging Errors as a Function of Azimuth in Laser Trackers and Tracers
Published: 4/18/2013
Authors: Balasubramanian Muralikrishnan, Vincent D Lee, Christopher J Blackburn, Daniel S Sawyer, Steven David Phillips, Wei Ren, Ben Hughes
Abstract: Tilt and radial error motion of a laser tracker head as it spins about the two axes results in small but measurable ranging and angle errors. The laser tracer, on the other hand, measures range with respect to the center of a high quality stationary ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913026

9. A Model for Geometry-Dependent Errors in Length Artifacts
Series: Journal of Research (NIST JRES)
Report Number: 117.013
Published: 9/27/2012
Authors: Daniel S Sawyer, Brian Parry, Christopher J Blackburn, Balasubramanian Muralikrishnan, Steven David Phillips
Abstract: We present a detailed model of dimensional changes in long length artifacts, such as step gauges and ball bars, due to bending under gravity. The comprehensive model is based on evaluation of the gauge points relative to the neutral bending surf ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910861

10. Measuring Scale Errors in a Laser Tracker s Horizontal Angle Encoder through Simple Length Measurement and Two-face System Tests
Published: 11/1/2010
Authors: Balasubramanian Muralikrishnan, Christopher J Blackburn, Daniel S Sawyer, Steven David Phillips, Robert Bridges, Quan Ma
Abstract: We describe a method to estimate the scale errors in the horizontal angle encoder of a laser tracker in this paper. The method does not require expensive instrumentation such as a rotary stage or even a calibrated artifact. An uncalibrated but stable ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904221



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