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Search Publications by: Theodore D. Doiron (Assoc)

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Displaying 26 - 50 of 74

Dimensional Metrology of Bipolar Fuel Cell Plates Using Laser Spot Triangulation Probes

March 22, 2011
Author(s)
Balasubramanian Muralikrishnan, Wei Ren, Dennis S. Everett, Eric S. Stanfield, Theodore D. Doiron
As in any engineering component, manufacturing a bipolar fuel cell plate for a polymer electrolyte membrane (PEM) hydrogen fuel cell power stack to within its stated design tolerances is critical in achieving the intended function. In a bipolar fuel cell

Gauge Blocks - A Zombie Technology

May 1, 2008
Author(s)
Theodore D. Doiron
Gauge blocks have been the primary method for disseminating length traceability for over 100 years. Their longevity was based on two things: it was relatively inexpensive to deliver very high accuracy to users, and the technical limitation that the range

Early Results From the NIST M48 CMM in the New AML Facility

March 3, 2006
Author(s)
John R. Stoup, Bryon S. Faust, Theodore D. Doiron
The Advanced Measurement Laboratory at NIST in Gaithersburg has already provided real, measurable improvement in some dimensional metrology measurement processes at NIST, most notably in the performance of the NIST Moore M48 coordinate measuring machine1

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

Deformation of Gauge Blocks

January 1, 2002
Author(s)
Theodore D. Doiron, Eric S. Stanfield, Dennis S. Everett
When a force is exerted on any material, the material deforms. Most of the time the effect is small and is neglected. In the measurement of gauge blocks, where the uncertainty goal is stated in nanometers, the deformation is a very large effect, and can be

Video-Based Metrology

January 1, 2002
Author(s)
Theodore D. Doiron, Marilyn N. Abrams, Tsai Hong Hong, Michael O. Shneier
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

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

A Careful Consideration of the Calibration Concept

March 1, 2001
Author(s)
Steven D. Phillips, William T. Estler, Theodore D. Doiron, K Eberhardt, M Levenson
This paper is a detailed discussion of the technical aspects of the calibration process with emphasis on the definition of the measurand, the conditions under which the calibration results are valid, and the subsequent use of the calibration results in

A Careful Consideration of the Calibration Concept

January 1, 2001
Author(s)
Steven D. Phillips, William T. Estler, Theodore D. Doiron, K Eberhardt, M. Levenson
This paper is a detailed discussion of the technical aspects of the calibration process with emphasis on the definition of the measurand, the conditions under which the calibration results are valid, and the subsequent use of the calibration results in

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