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Displaying records 31 to 40 of 61 records.
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31. Laser Trackers: Testing and Standards
Published: 1/1/2007
Author: Steven David Phillips
Abstract: Laser trackers are now the tool of choice for large scale coordinate metrology.  They are transportable allowing reconfigurable production facilities at a lower capital cost than large CMMs.  Trackers now include absolute distance measuring ...

32. 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 ...

33. Measurement Uncertainty and Traceability Issues in National and International Measurements
Published: 5/1/2003
Author: Steven David Phillips
Abstract: This paper discusses some recent laboratory intercomparisons with emphasis on the success of the uncertainty statement to include the reference value. Some factors that affect this capability are discussed. Recently developed national and internation ...

34. Measurement Uncertainty and Traceability Issues: A Standards Activity Update
Published: 1/1/2004
Author: Steven David Phillips

35. Measurement Uncertainty and Uncorrected Bias
Published: 1/1/1999
Authors: Steven David Phillips, K Eberhardt, William Tyler Estler
Abstract: This paper discusses the distinction between measurement uncertainty, measurement errors and their role in the calibration process. The issue of including uncorrected bias is addressed and a method to extend the current ISO Guide to the Expression of ...

36. Measurement Uncertainty, CMMs, and Standards: Today and the Future
Published: 1/1/2005
Author: Steven David Phillips
Abstract: Over the past decade modern measurement uncertainty evaluation has evolved from an obscure art practiced at National Measurement Institutes (NMIs) to an increasingly intertwined aspect of industrial metrology.  This paper examines the progressio ...

37. 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 ...

38. NIST SRM 9983 High Rigidity Ball-Bar Stand User Manual
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 5659
Published: 6/1/1995
Authors: Daniel S Sawyer, Steven David Phillips, Gregory W Caskey, Bruce R. Borchardt, David E Ward, P Snoots
Abstract: This document is the user manual for the NIST SRM 9983 High Rigidity Ball Bar Stand. The manual contains a list of the components that are included as part of the unit. Complete instructions for setting up and assembling the stand to support a ball b ...

39. 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), ...

40. Performance Evaluations
Published: 1/1/1995
Author: Steven David Phillips
Abstract: The subject of coordinate measuring machine (CMM) evaluation is a broad an multifaceted one. The theme of this chapter is the evaluation of CMM measurement uncertainty which is central to the concept of traceability. This chapter elucidates the sourc ...

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