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Author: balasubramanian muralikrishnan
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1. A Method of Determining Sphere Center to Center Distance Using Laser Trackers For Evaluating Laser Scanners.
Published: 11/11/2014
Authors: Prem Kumar Rachakonda, Balasubramanian Muralikrishnan, Vincent D Lee, Daniel S Sawyer, Steven David Phillips, John Palmateer
Abstract: The Dimensional Metrology Group (DMG) at the National Institute of Standards and Technology (NIST) is involved in the development of documentary standards for volumetric performance evaluation of laser scanners. Typical evaluation of these scanne ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916458

2. 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

3. EVALUATION OF A LASER SCANNER FOR LARGE VOLUME COORDINATE METROLOGY ‹ A COMPARISON OF RESULTS BEFORE AND AFTER FACTORY CALIBRATION
Published: 10/1/2014
Authors: Massimiliano M. Ferrucci, Balasubramanian Muralikrishnan, Daniel S Sawyer, Steven David Phillips, Peter Petrov, Yuri Yakovlev, Andrey Astrelin, Spike Milligan, John Palmateer
Abstract: Large volume laser scanners are increasingly being used for a variety of dimensional metrology applications. Methods to evaluate the performance of these scanners are still under development and there are currently no documentary standards available. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915965

4. In-situ Temperature Calibration Capability for Dimensional Metrology
Published: 7/28/2014
Authors: Prem Kumar Rachakonda, Daniel S Sawyer, Balasubramanian Muralikrishnan, Christopher J Blackburn, Craig M Shakarji, Gregory F Strouse, Steven David Phillips
Abstract: The Dimensional Metrology Group (DMG) at the National Institute of Standards and Technology (NIST) has the capability to perform large range dimensional measurements in a facility, called the Tape Tunnel. The Tape Tunnel is equipped with a 60 m l ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915733

5. Ranging Performance Evaluation of a Laser Scanner
Published: 10/20/2013
Authors: Massimiliano M. Ferrucci, Balasubramanian Muralikrishnan, Christopher J Blackburn, Daniel S Sawyer, Steven David Phillips, Vincent D Lee, Peter Petrov, Yuri Yakovlev, Andrey Astrelin, Spike Milligan, John Palmateer
Abstract: Large volume laser scanners are used for a variety of purposes, including dimensional metrology of large artifacts, digitization and reverse engineering, as well as historical preservation and archiving. In evaluating the performance of laser sca ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914333

6. VOLUMETRIC PERFORMANCE EVALUATION OF A LASER SCANNER
Published: 10/20/2013
Authors: Balasubramanian Muralikrishnan, Massimiliano M. Ferrucci, Daniel S Sawyer, Grant Gerner, Vincent D Lee, Christopher J Blackburn, Steven David Phillips, Peter Petrov, Yuri Yakovlev, Andrey Astrelin, Spike Milligan, John Palmateer
Abstract: There are several sources of error in a laser scanner measurement. The optical and material properties of the target, the shape, form, surface texture, color, reflectivity, and orientation of the target in space, environmental effects, etc., all cont ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914153

7. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913578

8. The Effect of Tip Size in Calibration of Surface Roughness Specimens with Rectangular Profiles
Published: 9/2/2013
Authors: Jun-Feng Song, Thomas B Renegar, Johannes A Soons, Balasubramanian Muralikrishnan, John S Villarrubia, Xiaoyu A Zheng, Theodore Vincent Vorburger
Abstract: For the calibration of rectangular and trapezoidal profile roughness specimens, stylus tip will increase profile peak width and decrease valley width, which may cause the Ra changes (either increase or decrease, depends on the profile shape). Someti ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911850

9. 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

10. 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



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