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Search Publications by: John R. Stoup (Fed)

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Displaying 26 - 40 of 40

Micro-Feature Metrology

May 1, 2005
Author(s)
Bala Muralikrishnan, Jack A. Stone Jr., John R. Stoup
This presentation focuses on three aspects of micro-feature metrology novel applications that drive research and commercialization, capabilities and limitations of existing sensors and techniques, and finally a summary of recent research including ongoing

New Capabilities At NIST In Dimensional Metrology

January 1, 2005
Author(s)
Theodore D. Doiron, Eric S. Stanfield, Bryon S. Faust, John R. Stoup, Mary Abbott
A number of new or revised services in dimensional metrology are presented. Included are: a lower cost, high accuracy calibration for sphere diameter; reduced uncertainty in roundness calibration; a new instrument for measurement of the thermal expansion

Video-Based Metrology

January 1, 2002
Author(s)
Theodore D. Doiron, John R. Stoup, Marilyn N. Abrams, Tsai Hong Hong
Video cameras are increasingly used to make dimensional measurements. Many of these systems use interpolation of the pixel data, with some systems claiming to find edges with precision of l/100 of a pixel. We have studied the response of single pixels of a

Accuracy and Versatility of the NIST M48 Coordinate Measuring Machine

October 1, 2001
Author(s)
John R. Stoup, Theodore D. Doiron
The NIST Is continuing to develop the ability to perform accurate, traceable measurements on a wide range of artifacts using a very precise, error-mapped coordinate measuring machine (CMM). The NIST M48 CMM has promised accuracy and versatility for many

Video Based Metrologly

December 1, 2000
Author(s)
Theodore D. Doiron, Tsai H. Hong, John R. Stoup, Marilyn N. Abrams
Video cameras are increasingly used to make dimensional measurements. Many of these systems use interpolation of the pixel data, with some systems claiming to find edges with precision of 1/100 of a pixel. We have studied the response of single pixels of a

Video Based Metrology

June 1, 2000
Author(s)
Theodore D. Doiron, John R. Stoup, Tsai Hong Hong, Marilyn N. Abrams
With the rapid growth of video-based measurement and inspection systems, we would like to determine the extent to which industry needs calibration artifacts and standardized methods for video metrology. We hope to open a dialog among users for discussing

NORAMET Comparison of Gauge Block Measurement by Optical Interferometry

October 1, 1999
Author(s)
Jennifer Decker, A Lapointe, John R. Stoup, M V. Alonso, J R. Pekelsky
A varied assortment of 47 new and used steel, ceramic, chromium carbide and tungsten carbide gauge blocks from 9 manufacturers, ranging in length from 05. mm to 101.6 mm were calibrated by four laboratories from the NORAMET countries using the method of

Case Against Optical Gauge Block Metrology

September 1, 1998
Author(s)
Theodore D. Doiron, Dennis S. Everett, Bryon S. Faust, Eric S. Stanfield, John R. Stoup
The current definition of length of a gage block is a very clever attempt to evade the systematic errors associated with the wringing layer thickness and optical phase corrections. In practice, there are very large systematic operator and surface effects

Minimizing Error Sources in Gage Block Mechanical Comparison Measurements

September 1, 1998
Author(s)
Bryon S. Faust, John R. Stoup, Debra K. Stanfield
Error sources in gage block mechanical comparisons can range from classical textbook examples (thermal gradients, correct temperature value, and correct master value) to a completely counter-intuitive example of diamond probe tip wear at low applied force

Uncertainty and Dimensional Calibrations

November 1, 1997
Author(s)
Theodore D. Doiron, John R. Stoup
The calculation of uncertainty for a measurement is an effort to set reasonable bounds for the measurement result according to standardized rules. Since every measurement produces only an estimate of the answer, the primary requisite of an uncertainty

A High Accuracy Micrometer for Diameter Measurements of Cylindrical Standards

January 1, 1994
Author(s)
John R. Stoup, Theodore D. Doiron
NIST has developed a new instrument to measure cylindrical standards including thread wires and plain plug gages. The instrument uses a laser interferometer system which is coupled with an air bearing linear motion slide and precise contact geometry to