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You searched on: Author: daniel sawyer

Displaying records 11 to 20 of 45 records.
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11. 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

12. 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

13. 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

14. 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

15. 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

16. 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

17. 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

18. Standard Reference Materials for Medical CT
Published: 6/27/2013
Authors: Zachary H Levine, Huaiyu H Chen-Mayer, Adam L Pintar, Daniel S Sawyer
Abstract: NIST Standard Reference Materials 2087 and 2088 for medical computed tomography (CT) have become available. The materials allow CT reconstructions to be tied to the International System of Units in length, density, and mass attenuation coefficient.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913506

19. 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

20. 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



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