Absolute measurement of thermal noise in a resonant short-range force experiment
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IOP Publishing Ltd
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Abstract
Planar, double-torsional oscillators are especially suitable for short-range
macroscopic force search experiments, since they can be operated at the limit
of instrumental thermal noise. As a study of this limit, we report a measurement
of the noise kinetic energy of a polycrystalline tungsten oscillator in
thermal equilibrium at room temperature. The fluctuations of the oscillator in a
high-Q torsional mode with a resonance frequency near 1 kHz are detected
with capacitive transducers coupled to a sensitive differential amplifier. The
electronic processing is calibrated by means of a known electrostatic force and
input from a finite-element model. The measured average kinetic energy,
Eexp = (2.0 ± 0.3) × 10E-21 J, is in agreement with the expected value of 1/2kBT.
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Public domain version of publication, supporting data sets and analysis programs
Keywords
short-range tests of gravity, equipartition theorem, thermal noise measurements, torsional oscillators
Citation
H Yan et al 2014 Class. Quantum Grav. 31 205007
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Yan_et_al_Class_Quantum_Grav_31_205007_2014 is made available under the Open Data Commons Attribution License: http://opendatacommons.org/licenses/by/