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Author: daniel sawyer
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Displaying records 1 to 10 of 26 records.
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1. 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

2. 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

3. 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

4. Choosing test positions for laser tracker evaluation and future Standards development
Published: 7/15/2010
Authors: Balasubramanian Muralikrishnan, Daniel S Sawyer, Christopher J Blackburn, Steven David Phillips, Craig M Shakarji, Ed Morse, Robert Bridges
Abstract: A working group within the ISO TC 213 committee is developing a draft document [11] for evaluating the performance of laser trackers. The ASME B89.4.19 Standard [1] and the draft VDI/VDE 2617 part 10 [2] describe some useful tests that are incorporat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905959

5. ASME B89.4.19 Performance Evaluation Tests and Geometric Misalignments in Laser Trackers
Published: 1/30/2009
Authors: Balasubramanian Muralikrishnan, Daniel S Sawyer, Christopher J Blackburn, Steven David Phillips, Bruce R. Borchardt, William Tyler Estler
Abstract: Small and unintended offsets, tilts, and eccentricity of the mechanical and optical components in laser trackers introduce systematic errors in the measured spherical coordinates (angles and range readings), and possibly in the calculated lengths of ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=824664

6. A Low Cost Fiducial Reference for Computed Tomography
Published: 11/11/2008
Authors: Zachary H Levine, Steven E Grantham, Daniel S Sawyer, Anthony P Reeves, David F Yankelevitz
Abstract: Rationale and Objectives. To detect the growth in lesions, it is necessary to ensure that the apparent changes in size are above the noise floor of the system. By introducing a fiducial reference, it may be possible to detect smaller changes in le ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842437

7. Calibration of a Computer Assisted Orthopedic Hip Surgery Phantom
Published: 11/4/2008
Authors: Daniel S Sawyer, Nicholas G Dagalakis, Craig M Shakarji, Yong Sik Kim
Abstract: Orthopedic surgeons have identified a need for calibration artifacts (phantoms) to establish the traceability (to the SI unit of length) of measurements performed with Computer Assisted Orthopedic Surgery (CAOS) systems. These phantoms must be light ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=824707

8. Performance Evaluation of Laser Trackers
Published: 9/15/2008
Authors: Balasubramanian Muralikrishnan, Daniel S Sawyer, Christopher J Blackburn, Steven David Phillips, Bruce R. Borchardt, William Tyler Estler
Abstract: The American Society for Mechanical Engineers (ASME) recently released the ASME B89.4.19 Standard [1] on performance evaluation of spherical coordinate instruments such as laser trackers. At the National Institute of Standards and Technology (NIST), ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=824702

9. Development of Tools for Measuring the Performance of Computer Assisted Orthopaedic Hip Surgery Systems
Published: 12/28/2007
Authors: Nicholas G Dagalakis, Yong Sik Kim, Daniel S Sawyer, Craig M Shakarji
Abstract: In the late seventies a sensor was invented, which could track the movement of athlete body parts.  In the early eighties an improved version of this sensor was introduced, by a group of NIST researchers, for the calibration and the performance ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=823612

10. NIST Medical Phantom Device to Assist With the Calibration and Performance Testing of CAOS Systems
Published: 11/9/2007
Authors: Nicholas G Dagalakis, James B Stiehl, Yong Sik Kim, Daniel S Sawyer, Craig M Shakarji
Abstract: According to expert othopaedic surgeons there is need for medical phantom devices with dimensional metrology traceable to national standards metrology organizations in order to confirm basic Computer Assisted Orthopaedic Surgery (CAOS) systems perfor ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=823625



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