Thermal Noise
Permanent link for this collectionhttps://hdl.handle.net/2022/19162
Browse
Recent Submissions
Now showing 1 - 2 of 2
Item Absolute measurement of thermal noise in a resonant short-range force experiment(IOP Publishing Ltd, 2014-10-03) Long, JoshPlanar, 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.Item 2013_08_08 Noise vs Bandwidth(2014-11-19) Yan, Haiyang