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

Autor:	Yan, H., Housworth, E. A., Meyer, H. O., Visser, G., Weisman, E., Long, J. C.
Rok vydání:	2014
Předmět:	Condensed Matter - Statistical Mechanics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology Physics - Instrumentation and Detectors
Zdroj:	Class. Quantum Grav. 31 205007 (2014)
Druh dokumentu:	Working Paper
DOI:	10.1088/0264-9381/31/20/205007
Popis:	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. Comment: 28 pages, 10 figures, new title, additional references and discussion of force sensitivity, minor corrections
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1402.0145 Zobrazit plný text záznamu View this record from Arxiv