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Author: Steven Phillips

Displaying records 1 to 10 of 54 records.
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1. Assessment of Conformity, Decision Rules and Risk Analysis
Published: 4/1/2014
Authors: Steven David Phillips, Michael Krystek
Abstract: Measurement uncertainty has important economic consequences for calibration and inspection activities. In calibration reports, the magnitude of the uncertainty is often taken as an indication of the quality of the laboratory. In industrial measurem ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913729

2. Standardized Performance Testing Metrics for Optical Coordinate Measurement Systems
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7883
Published: 5/9/2013
Author: Steven David Phillips
Abstract: Optical probing technology on coordinate measuring machines (CMMs) operates significantly differently from discrete point probing associated with tactile probing CMMs hence manufacturers of this technology seek to use different testing artifacts for ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912341

3. 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

4. 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

5. Performance Evaluations
Published: 7/1/2011
Author: Steven David Phillips
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912362

6. 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

7. 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

8. Economics of Measurement Uncertainty and Tolerances
Published: 7/1/2009
Authors: Steven David Phillips, J.M. Baldwin, William Tyler Estler
Abstract: Productivity is considered by considering Cobb-Douglas production function and focusing on total factor productivity (TFP). We argue that developed economies like the United States need to develop TFP by utilizing advances in computation power and in ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902981

9. 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

10. Dimensional measurement traceability of 3D imaging data
Published: 1/19/2009
Authors: Steven David Phillips, Craig M Shakarji, Michael Krystek, K Summerhays
Abstract: This paper discusses the concept of metrological traceability to the SI unit of length, the meter. We describe how metrological traceability is realized, give a recent example of the standardization of laser trackers, and discuss progress and challe ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900252



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