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Absolute measurement of thermal noise in a resonant short-range force experiment

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 is in agreement with the expected value of 1/2 kT.

preprint2014arXivOpen access
H. YanE. A. HousworthH. O. MeyerG. VisserE. WeismanJ. C. Long
cond-mat.stat-mechphysics.ins-dethep-phgr-qc
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H. YanE. A. HousworthH. O. MeyerG. VisserE. WeismanJ. C. Long

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