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You searched on: Author: Theodore Doiron

Displaying records 1 to 10 of 29 records.
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1. Two Applications of Small Feature Dimensional Measurements on a CMM with a Fiber Probe
Published: 9/4/2013
Authors: Eric S Stanfield, Balasubramanian Muralikrishnan, Theodore D Doiron, Xiaoyu A Zheng, Shahram Orandi, david Duquette
Abstract: We describe two interesting applications of dimensional measurements performed using a contact fiber probe on a commercial Coordinate Measuring Machine (CMM). Both examples involve artifacts that serve as material standards and contain features in th ...

2. Applications of Profile Filtering in the Dimensional Metrology of Fuel Cell Plates
Published: 5/14/2013
Authors: Balasubramanian Muralikrishnan, Wei Ren, Eric S Stanfield, Dennis S Everett, Xiaoyu A Zheng, Theodore D Doiron
Abstract: We describe the application of several surface profile filters as an enabling tool in the dimensional measurements of an engineering artifact, namely, a fuel cell plate. We recently reported work on the development of a non-contact system for dimensi ...

3. Performance Evaluation Experiments on a Laser Spot Triangulation Probe
Published: 11/25/2011
Authors: Balasubramanian Muralikrishnan, Wei Ren, Dennis S Everett, Eric S Stanfield, Theodore D Doiron
Abstract: Laser triangulation probes are increasingly used for dimensional measurements in a variety of applications. At the National Institute of Standards and Technology, we have recently explored the use of laser spot triangulation probes to determine dimen ...

Published: 11/15/2011
Authors: Balasubramanian Muralikrishnan, Wei Ren, Dennis S Everett, Eric S Stanfield, Theodore D Doiron
Abstract: Non-contact dimensional measurement of fuel cell plates is critical to the eventual rapid manufacture by supporting in-process measurement and control. This need has been identified by the Department of Energy‰s Hydrogen Program, and by numerous manu ...

5. Dimensional Metrology of Bipolar Fuel Cell Plates Using Laser Spot Triangulation Probes
Published: 3/22/2011
Authors: Balasubramanian Muralikrishnan, Wei Ren, Dennis S Everett, Eric S Stanfield, Theodore D Doiron
Abstract: 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 ...

6. Gauge Blocks - A Zombie Technology
Series: Journal of Research (NIST JRES)
Published: 5/1/2008
Author: Theodore D Doiron
Abstract: 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 r ...

7. 20 Degrees Celsius--A Short History of the Standard Reference Temperature for Industrial Dimensional Measurements
Series: Journal of Research (NIST JRES)
Published: 1/1/2007
Author: Theodore D Doiron
Abstract: While most dimensional metrologists know that the reference temperature for dimensional measurements is 20  C, very few know how or why that temperature was chosen.  Many people have thought it was, in some sense, arbitrary.  In actual ...

8. Early Results From the NIST M48 CMM in the New AML Facility
Published: 3/3/2006
Authors: John Richard Stoup, Bryon S. Faust, Theodore D Doiron
Abstract: 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 mach ...

9. New Capabilities At NIST In Dimensional Metrology
Published: 1/1/2005
Authors: Theodore D Doiron, Eric S Stanfield, Bryon S. Faust, John Richard Stoup, Mary Abbott
Abstract: 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 ...

10. Measurements of Large Silicon Spheres Using the NIST M48 Coordinate Measuring Machine
Published: 11/1/2003
Authors: John Richard Stoup, Theodore D Doiron
Abstract: The NIST M48 coordinate measuring machine (CMM) was used to measure the average diameter of two precision, silicon spheres of nominal diameter near 93.6 mm. A measurement technique was devised that took advantage of the specific strengths of the mach ...

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