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Topic Area: Metrology

Displaying records 61 to 70 of 851 records.
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61. Accurate Measurements of Process Gas Flow with Laminar Flow Meters
Topic: Metrology
Published: 10/15/2010
Authors: Thiago Cobu, Robert F Berg, John D Wright, Michael R Moldover
Abstract: We calibrated three models of commercially-manufactured, laminar flow meters (LFMs) with nitrogen at four pressures (100 kPa, 200 kPa, 300 kPa, and 400 kPa) over a 10:1 flow range using NIST‰s primary flow standards and a physical model. Without addi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906313

62. Description and Uncertainty Analysis of NIST‰s 20 Liter Hydrocarbon Liquid Flow Standard (20 L HLFS)
Topic: Metrology
Published: 10/15/2010
Authors: Aaron N Johnson, Christopher J. Crowley, Tsyh Tyan Yeh
Abstract: The National Institute of Standards and Technology (NIST) uses a bi-directional piston prover as its primary standard for measuring hydrocarbon liquid flows ranging from 1.86 × 10-5 m3/s (0.3 gpm) to 2.6 × 10-3 m3/s (40 gpm). An uncertainty analysis ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906350

63. Methodology for evaluating Static six-degree-of-freedom (6DoF) Perception Systems
Topic: Metrology
Published: 10/15/2010
Authors: Tommy Chang, Tsai Hong Hong, Joseph A Falco, Michael O Shneier, Milli Shah, Roger D Eastman
Abstract: In this paper, we apply two fundamental approaches toward evaluating a static, vision based, six-degree-of-freedom (6DoF) pose determination system that measures the position and orientation of a part. The first approach uses ground\-truth carefully ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906660

64. Properties for Accurate Gas Flow Measurements
Topic: Metrology
Published: 10/15/2010
Author: John D Wright
Abstract: Accurate gas properties are needed to take full advantage of the low uncertainties provided by NIST‰s Gas Flow Calibration Services. If a flowmeter user and NIST use different values for these properties (molecular mass, compressibility, density, vis ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905976

65. Embedded Capacitive Displacement Sensor for Nanopositioning Applications
Topic: Metrology
Published: 8/17/2010
Authors: Svetlana Avramov-Zamurovic1, Nicholas G Dagalakis, Rae Duk Lee, Yong Sik Kim, Jae Myung Yoo, Seung Ho Yang
Abstract: The scale of nano objects requires very precise position determination. The state-of-the-art manipulators involve accurate nanometer positioning. This paper presents the design of a capacitive displacement sensor for a nanopositioning application. Th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906019

66. Choosing test positions for laser tracker evaluation and future Standards development
Topic: Metrology
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

67. High-voltage Nanoimprint Lithography of Refractory Metal Film
Topic: Metrology
Published: 7/1/2010
Authors: John A. Dagata, Natalia Farkas, R Ramsier
Abstract: Local oxidation of metal, semiconductor, and polymer surfaces has provided a common basis from which to explore fundamental principles of nanolithography and prototype functional nanostructures for many years now. This article summarizes an investiga ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=824748

68. Cylindrical Acoustic Resonator for the Re-determination of the Boltzmann Constant
Topic: Metrology
Published: 6/1/2010
Authors: J.T. Zhang, H. Lin, X.J. Feng, Keith A Gillis, Michael R Moldover
Abstract: We describe progress towards re-determining the Boltzmann constant {I}k{/I}^dB^ using two fixed-path, gas-filled, cylindrical, acoustic cavity resonators. The longitudinal acoustic resonance modes of a cylindrical cavity have lower quality factors {I ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905511

69. Feasibility of an Accurate Dynamic Standard for Water Flow
Topic: Metrology
Published: 6/1/2010
Authors: Iosif I Shinder, Michael R Moldover
Abstract: We used NIST's primary water flow standard to study the feasibility of accurately determining mass flow rates {I}m{/I}^ddot^ of water "dynamically," that is from the time derivative of the weight {I}W{/I} of the collection tank: {I}m{/I ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=832344

70. Performance of Critical Flow Venturis under Transient Conditions
Topic: Metrology
Published: 4/13/2010
Author: John D Wright
Abstract: Critical flow venturis (CFVs) can be used to measure flow under transient pressure and flow conditions with uncertainties of 0.13 % or less (95 % confidence level). Blow-down tests transferred 630 g of nitrogen during a 100 s interval from an unregul ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904378



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