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You searched on: Author: Jon Pratt

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1. A determination of the local acceleration of gravity for the NIST-4 watt balance
Published: 1/21/2015
Authors: David B Newell, Eric Leaman, Darine El Haddad, Frank Christian Seifert, Leon S Chao, Yusi A. Cao, Jon Robert Pratt, Stephan Schlamminger
Abstract: A new watt balance is being constructed at the National Institute of Standards and Technology in preparation for the redefinition of the International System of Units and the realization of mass through an exact value of the Planck constant. The to ...

2. A self-calibrating optomechanical force sensor with femtonewton resolution
Published: 12/10/2014
Authors: John T. Melcher, Julian Stirling, Felipe Guzman, Jon Robert Pratt, Gordon Allan Shaw
Abstract: We report the development of an ultrasensitive optomechanical sensor designed to improve the accuracy and precision of force measurements with atomic force microscopy. The sensors achieve quality factors of 4.3x10^6 (a 100-fold improvement over qua ...

3. A nonlinearity in permanent-magnet systems used in watt balances
Published: 6/25/2014
Authors: Shisong Li, Stephan Schlamminger, Jon Robert Pratt
Abstract: In watt balances that employ permanent magnet systems to generate the magnetic flux the effects of the weighing current on the magnet systems can generate a systematic bias that can lead to an error in the result if not accounted for. In this article ...

4. High Sensitivity Optomechanical Reference Accelerometer Over 10 kHz
Published: 6/5/2014
Authors: Felipe Guzman, Lee M. Kumanchik, Jon Robert Pratt, Jacob M Taylor
Abstract: We present an optically detected mechanical accelerometer that achieves a sensitivity of 100 ng/√Hz over a bandwidth of 10 kHz and is traceable. We have incorporated a Fabry-Perot fiber-optic micro-cavity that is currently capable of measurin ...

5. Determination of the Planck constant using a watt balance with a superconducting magnet system at the National Institute of Standards and Technology
Published: 3/31/2014
Authors: Stephan Schlamminger, Darine El Haddad, Frank Christian Seifert, Leon S Chao, David B Newell, Richard L Steiner, Jon Robert Pratt
Abstract: In the past two years measurements were performed with a watt balance at the National Institute of Standards and Technology (NIST) to determine the Planck constant. A detailed analysis of these measurements and their uncertainties led to a value ...

6. How to weigh everything from atoms to apples using the revised SI
Published: 3/3/2014
Author: Jon Robert Pratt
Abstract: The fact that the unit of mass might soon be derived from the Planck constant, rather than from an artifact standard, can seem daunting and downright baffling when viewed from the vantage point of our day to day perception of mass. After all, at meas ...

7. Functional Constraints and the Design of a New Watt Balance
Published: 9/30/2013
Authors: Leon S Chao, Stephan Schlamminger, Jon Robert Pratt
Abstract: The functional constraints driving the design of the new permanent-magnet driven watt balance (NIST-4) outline the variables and compromises worthy of addressing. Construction according to these design parameters will demonstrate the high precision c ...

8. Experimental Determination of Mode Correction Factors for Thermal Method Spring Constant Calibration of AFM Cantilevers using Laser Doppler Vibrometry
Published: 5/30/2013
Authors: Richard Swift Gates, William A Osborn, Jon Robert Pratt
Abstract: Mode corrections factors (MCF‰s) are a significant adjustment to the spring constant values measured using the Thermal cantilever calibration method. Usually, the ideal factor of 0.971 for a tipless rectangular cantilever is used which adjusts the v ...

9. Accurate and Precise Calibration of AFM Cantilever Spring Constants using Laser Doppler Vibrometry
Published: 8/24/2012
Authors: Richard Swift Gates, Jon Robert Pratt
Abstract: Accurate cantilever spring constants are important in atomic force microscopy in both control of sensitive imaging and to provide correct nanomechanical property measurements. Conventional atomic force microscope (AFM) spring constant calibration t ...

10. Report on the first international comparison of small force facilities: A pilot study at the micronewton level
Published: 11/28/2011
Authors: Jon Robert Pratt, Min-Seok Kim, Uwe Brand, Christopher Jones
Abstract: Measurements of forces less than a micronewton are critical when examining the mechanical behaviors of materials and devices at characteristic length scales below a micrometer. As a result, standards for nanomechanical tests and test equipment are be ...

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