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You searched on: Author: Jon Pratt

Displaying records 1 to 10 of 92 records.
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1. Optomechanical reference accelerometer
Published: 9/8/2015
Authors: Oliver Gerberding, Felipe Guzman, John T. Melcher, Jon Robert Pratt, Jacob M Taylor
Abstract: We present an opto-mechanical accelerometer device with high dynamic range, high bandwidth and readout noise levels exceeding 10 μg/√Hz . The straightforward assembly and small cost of our device make it a prime candidate to perform on-s ...

2. Optomechanical Motion Sensors
Published: 7/8/2015
Authors: Felipe Guzman, Oliver Gerberding, John T. Melcher, Julian Stirling, Jon Robert Pratt, Gordon Allan Shaw, Jacob M Taylor
Abstract: Compact optical cavities can be combined with motion sensors to yield unprecedented resolution and SI-traceability in areas such as acceleration sensing and atomic force microscopy AFM, among others. We have incorporated Fabry-Perot fiber-optic m ...

3. The Redefinition of the SI: Impact on Calibration Services at NIST
Published: 6/1/2015
Authors: Neil M Zimmerman, Jon Robert Pratt, Michael R Moldover, David B Newell, Gregory F Strouse
Abstract: As most readers are probably at least vaguely aware, it is likely that the SI system of units will be redefied in 2018. This redefinition would fundamentally change the logical structure of the SI, with one result being a substantial change in how ma ...

4. 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 ...

5. Measurement of the Gold-Gold Bond Rupture Force at 4 K in a Single-Atom Chain Using Photon-Momentum-Based Force Calibration
Published: 12/22/2014
Authors: Douglas T Smith, Jon Robert Pratt
Abstract: We present instrumentation and methodology for simultaneously measuring force and displacement at the atomic scale at 4 K. The technique, which uses a macroscopic cantilever as a force sensor and high-resolution, high-stability fiber-optic interfero ...

6. 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 ...

7. Alignment and testing of the NIST Calculable Capacitor
Published: 8/24/2014
Authors: Yicheng Wang, Felipe Guzman, Corey A Stambaugh, Radek Smid, Hugo Zuniga Calvo, Andrew David Koffman, Jon Robert Pratt, John Russell Lawall
Abstract: This paper reports progress on the NIST effort to develop a new calculable capacitor, focusing on improvement of the guard electrode motion control as well as issues associated with the overall electrode alignment. Design of a multi-wavelength Fabry- ...

8. 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 ...

9. 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 ...

10. 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 ...

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