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Displaying 1 - 25 of 422

ASME B89.4.19 Performance Evaluation Tests and Geometric Misalignments in Laser Trackers

January 30, 2009
Author(s)
Balasubramanian Muralikrishnan, Daniel S. Sawyer, Christopher J. Blackburn, Steven D. Phillips, Bruce R. Borchardt, William T. Estler
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

Laser tracker interim testing per the ASME B89.4.19-2021 and ISO 10360-10:2021 standards

June 28, 2023
Author(s)
Marcos Motta de Souza, Bala Muralikrishnan, Vincent Lee, Daniel S. Sawyer
The recently revised ASME B89.4.19-2021 and ISO 10360-10:2021 standards for laser trackers include a new interim test that is comprehensive and more sensitive to systematic errors than the interim tests in the previous versions of the standards, i.e., the

A Performance-Based Analysis of a Hotel Building Using Two Egress Models

February 19, 2017
Author(s)
Erica D. Kuligowski, James A. Milke
This report compares results from similar egress models based on documented evacuation movement data. When EXIT89 and Simulex1 are used to 1) simulate the same design scenarios and 2) perform a bounding analysis of the hotel building, differences in egress

A General Quantitative Method to Validate Instrument Calibration Techniques

November 1, 1999
Author(s)
Steven D. Phillips
In this paper a method to validate proposed calibration procedures for coordinate measuring machines (CMMs) is presented. Conceptually, the validation procedure is based on a computer generated population of CMMs assumed to include any real CMM that a

Laser Tracker Testing at NIST Using the ASME B89.4.19 Standard

January 1, 2007
Author(s)
Balasubramanian Muralikrishnan, Christopher J. Blackburn, Daniel S. Sawyer, Bruce R. Borchardt, William T. Estler, Steven D. Phillips
While the versatility and economics of laser trackers are quite appealing, the ability to assess their accuracy and to compare various brands has been limited by a lack of a national or international standard that encompasses testing and traceability

Performance Evaluation of Laser Trackers

September 15, 2008
Author(s)
Balasubramanian Muralikrishnan, Daniel S. Sawyer, Christopher J. Blackburn, Steven D. Phillips, Bruce R. Borchardt, William T. Estler
The American Society for Mechanical Engineers (ASME) recently released the ASME B89.4.19 Standard [1] on performance evaluation of spherical coordinate instruments such as laser trackers. At the National Institute of Standards and Technology (NIST), we can

Report of the 89th National Conference on Weights and Measures

December 9, 2004
Author(s)
Kenneth S. Butcher, Steven E. Cook, Linda D. Crown, K M. Dresser, H V. Oppermann, R C. Suiter, Juana S. Williams
The 89th Annual Meeting of the National Conference on Weights and Measures (NCWM) was held July 11 through July 15, 2004, at the Pittsburgh Hilton and Towers in Pittsburgh, PA. The theme of the meeting was, Changes and Opportunities. Reports by the NCWM

Choosing test positions for laser tracker evaluation and future Standards development

July 15, 2010
Author(s)
Balasubramanian Muralikrishnan, Daniel S. Sawyer, Christopher J. Blackburn, Steven D. Phillips, Craig M. Shakarji, Ed Morse, Robert Bridges
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 incorporated

Phase Transitions and Magnetocaloric Effect in Mn 3 Cu 0.89N d0.96^

August 1, 2014
Author(s)
Jun Yan, Ying Sun, Hui Wu, Qingzhen Huang, Cong Wang, Zaixing Shi, Sihao Deng, Kewen Shi, Huiqing Lu, Lihua Chu
… entropy change observed in the antiperovskite Mn 3 Cu 0.89 N 0.96. Based in the heat flow peak measured by … there are still much latent entropy in Mn d3^Cu 0.89 N^d0.96. …

Large-Scale Metrology Instrument Performance Evaluations at NIST

January 1, 2006
Author(s)
William T. Estler, Daniel S. Sawyer, Bruce R. Borchardt, Steven D. Phillips
The ASME B89 Committee on Dimensional Metrology has approved a new American National Standard B89.4.19 - Performance Evaluation of Laser Based Spherical Coordinate Measurement Systems. This Standard, to be published in 2006, specifies test methods for

A Review of the IEEE 1785 Standards for Rectangular Waveguides above 110 GHz

June 6, 2017
Author(s)
Ronald A. Ginley, Nick M. Ridler
A new series of standards has recently been published by IEEE defining waveguide for use at millimeter-wave and terahertz frequencies. The series comprises three standards covering different aspects of this technology: (i) frequency bands and waveguide

Enhancement of EXIT89 and Analysis of World Trade Center Data

August 1, 1996
Author(s)
R F. Fahy
The features of an enhanced model for egress from fires in non-residential occupancies is presented along with a users manual describing the use of the model. The enhancements to the model include analysis of locations of safety, smoke blockages, disabled
Displaying 1 - 25 of 422
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