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Author: steven phillips

Displaying records 41 to 50 of 59 records.
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41. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820942

42. Calculation of Measurement Uncertainty Using Prior Information
Published: 11/1/1998
Authors: Steven David Phillips, William Tyler Estler
Abstract: We describe the use of Bayesian inference to include prior information about the value of the measurand in the calculation of measurement uncertainty. Typical examples show this can, in effect, reduce the expanded uncertainty by up to 85 %. The ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820904

43. The Estimation of Measurement Uncertainty of Small Circular Features Measured by Coordinate Measuring Machines
Published: 4/1/1998
Authors: Steven David Phillips, Bruce R. Borchardt, William Tyler Estler, J Buttress
Abstract: This paper examines the measurement uncertainty of small circular features as a function of the sampling strategy; i.e., the number and distribution of measurement points. Specifically, we examine measuring a circular feature using a three-point samp ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820903

44. Guidelines for Expressing the Uncertainty of Measurement Results Containing Uncorrected Bias
Published: 9/1/1997
Authors: Steven David Phillips, K Eberhardt, B Parry
Abstract: This paper proposes a method to extend the current ISO Guide to the Expression of Uncertainty in Measurement to include the case of known, but uncorrected, measurement bias. It is strongly recommended that measurement results be corrected for bias, h ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820858

45. Practical Aspects of Touch Trigger Probe Error Compensation
Published: 7/1/1997
Authors: William Tyler Estler, Steven David Phillips, Bruce R. Borchardt, Ted Hopp, M Levenson, K Eberhardt, Marjorie A McClain
Abstract: We present extensions of our prior work in modeling and correcting for pretravel variation errors in kinematic seat touch-trigger coordinate measuring machine (CMM) probes with straight styli. A simple correction term is shown to account for a range ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820843

46. Discussion of Statistical Issues in Geometric Feature Inspection Using Coordinate Measuring Machines
Published: 2/1/1997
Authors: Steven David Phillips, K Eberhardt
Abstract: A coordinate measuring machine (CMM) is a computer controlled device that uses a probe to obtain measurements on a manufactured part''s surface, usually one point at a time. Probe movements may be programmed or determined manually by operatio ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820802

47. Results of the NIST National Ball Plate Round Robin
Published: 1/1/1997
Authors: Gregory W Caskey, Steven David Phillips, Bruce R. Borchardt
Abstract: This report examines the results of the ball plate round robin administered by NIST. The round robin was part of an effort to assess the current state of industry practices for measurements made using coordinate measuring machines. Measurements of a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820994

48. The Calculation of CMM Measurement Uncertainty via The Method of Simulation by Constraints
Published: 1/1/1997
Authors: Steven David Phillips, Bruce R. Borchardt, Daniel S Sawyer, William Tyler Estler, David E Ward, K Eberhardt, M. Levenson, Marjorie A McClain, B Melvin, Ted Hopp, Y Shen
Abstract: The calculation of task specific measurement uncertainty when using coordinate measuring machines is an important and challenging task. Current methods to address this issue use simulation techniques (e.g., the virtual CMM) where the propagation of k ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820857

49. Error Compensation for CMM Touch Trigger Probes
Published: 10/1/1996
Authors: William Tyler Estler, Steven David Phillips, Bruce R. Borchardt, Ted Hopp, G Witzgall, M Levenson, K Eberhardt, Marjorie A McClain, Y Shen, X Zhang
Abstract: We present the analysis of a simple mechanical model of a common type of kinematic seat touch trigger probe widely used on modern coordinate measuring machines (CMMs). The model provides a quantitative description of the pretravel variation or probe- ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=822130

50. Corrections for Wavelength Variations in Precision Interferometric Displacement Measurements
Published: 9/1/1996
Authors: Jack A Stone Jr, Steven David Phillips, G Mandolfo
Abstract: Precision interferometric displacement measurements require deadpath corrections to account for variations in wavelength during the course of the measurement. This paper discusses common errors in applying deadpath corrections and describes the corre ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820824



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