Výsledky vyhledávání - "Pratt, Jon R"

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Nanoscale torsional dissipation dilution for quantum experiments and precision measurement

Autor: Pratt, Jon R., Agrawal, Aman R., Condos, Charles A., Pluchar, Christian M., Schlamminger, Stephan, Wilson, Dalziel J.

We show that torsion resonators can experience massive dissipation dilution due to nanoscale strain, and draw a connection to a century-old theory from the torsion balance community which suggests that a simple torsion ribbon is naturally soft-clampe

Externí odkaz: http://arxiv.org/abs/2112.08350

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Optomechanical reference accelerometer

Autor: Gerberding, Oliver, Cervantes, Felipe Guzman, Melcher, John, Pratt, Jon R., Taylor, Jacob M.

Publikováno v: Metrologia, Volume 52, Number 5 (2015)

We present an optomechanical accelerometer with high dynamic range, high bandwidth and read-out noise levels below 8 ${\mu}$g/$\sqrt{\mathrm{Hz}}$. The straightforward assembly and low cost of our device make it a prime candidate for on-site referenc

Externí odkaz: http://arxiv.org/abs/1504.01055

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A self-calibrating optomechanical force sensor with femtonewton resolution

Autor: Melcher, John, Stirling, Julian, Cervantes, Felipe Guzman, Pratt, Jon R., Shaw, Gordon A.

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 reach quality factors of 4.3x10^6 and force resolution on the femtonew

Externí odkaz: http://arxiv.org/abs/1410.5725

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Determination of the Planck constant using a watt balance with a superconducting magnet system at the National Institute of Standards and Technology

Autor: Schlamminger, Stephan, Haddad, Darine, Seifert, Frank, Chao, Leon S, Newell, David B, Liu, Ruimin, Steiner, Richard L, Pratt, Jon R

Publikováno v: Metrologia 51, S15 (2014)

For the past two years, measurements have been 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 has led to t

Externí odkaz: http://arxiv.org/abs/1401.8160

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