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Author: balasubramanian muralikrishnan
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1. A Fiber Probe for CMM Measurements of Small Features
Published: 8/1/2005
Authors: Jack A Stone Jr, Balasubramanian Muralikrishnan, John Richard Stoup
Abstract: We report on performance of a new form of fiber probe, which can be used in conjunction with a coordinate measuring machine (CMM) for microfeature measurement.  The probe stylus is a glass fiber with a small ball (?75 ?m diameter) glued to the e ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=823194

2. A Model for Geometry-Dependent Errors in Length Artifacts
Series: Journal of Research (NIST JRES)
Report Number: 117.013
Published: 9/27/2012
Authors: Daniel S Sawyer, Brian Parry, Christopher J Blackburn, Balasubramanian Muralikrishnan, Steven David Phillips
Abstract: We present a detailed model of dimensional changes in long length artifacts, such as step gauges and ball bars, due to bending under gravity. The comprehensive model is based on evaluation of the gauge points relative to the neutral bending surf ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910861

3. A Proposed Interim Check for Field Testing a Laser Tracker‰s 3-D Length Measurement Capability Using a Calibrated Scale Bar as a Reference Artifact
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 8016
Published: 10/1/2014
Authors: Vincent D Lee, Christopher J Blackburn, Balasubramanian Muralikrishnan, Daniel S Sawyer, Mark Meuret, Aaron Hudlemeyer
Abstract: This paper describes a proposed interim check for field testing a laser tracker‰s 3-D length measurement capability using a calibrated scale bar as a reference artifact. The tests described here are constructed to be sensitive to uncompensated error ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916126

4. ASME B89.4.19 Performance Evaluation Tests and Geometric Misalignments in Laser Trackers
Published: 1/30/2009
Authors: Balasubramanian Muralikrishnan, Daniel S Sawyer, Christopher J Blackburn, Steven David Phillips, Bruce R. Borchardt, William Tyler Estler
Abstract: Small and unintended offsets, tilts, and eccentricity of the mechanical and optical components in laser trackers introduce systematic errors in the measured spherical coordinates (angles and range readings), and possibly in the calculated lengths of ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=824664

5. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913301

6. Area Measurement of Knife Edge and Cylindrical Apertures using Ultra Low Force Contact Fiber Probe on a CMM
Published: 1/1/2008
Authors: Balasubramanian Muralikrishnan, Jack A Stone Jr, John Richard Stoup
Abstract: Several radiometric and photometric measurements depend on high accuracy area measurement of precision apertures. Some apertures have sharp edges and are generally measured optically. At the Precision Engineering Division (PED) of the National Instit ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=824632

7. Assessing Ranging Errors as a Function of Azimuth in Laser Trackers and Tracers
Published: 4/18/2013
Authors: Balasubramanian Muralikrishnan, Vincent D Lee, Christopher J Blackburn, Daniel S Sawyer, Steven David Phillips, Wei Ren, Ben Hughes
Abstract: Tilt and radial error motion of a laser tracker head as it spins about the two axes results in small but measurable ranging and angle errors. The laser tracer, on the other hand, measures range with respect to the center of a high quality stationary ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913026

8. Choosing test positions for laser tracker evaluation and future Standards development
Published: 7/15/2010
Authors: Balasubramanian Muralikrishnan, Daniel S Sawyer, Christopher J Blackburn, Steven David Phillips, Craig M Shakarji, Ed Morse, Robert Bridges
Abstract: A working group within the ISO TC 213 committee is developing a draft document [11] for evaluating the performance of laser trackers. The ASME B89.4.19 Standard [1] and the draft VDI/VDE 2617 part 10 [2] describe some useful tests that are incorporat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905959

9. DIAMETER AND FORM MEASUREMENT OF A MICRO-HOLE IN A FUEL INJECTOR NOZZLE WITH THE NIST FIBER PROBE
Published: 11/2/2009
Authors: Balasubramanian Muralikrishnan, Jack A Stone Jr, John Richard Stoup
Abstract: We discuss the measurement of diameter and form of micro-holes with reverse tapers in a fuel injector nozzle using an ultra-low force contact fiber probe on a CMM. The fiber probe was designed and built at the National Institute of Standards and Tech ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902815

10. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907747



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