Direct measurement of thermal fluctuation of high-Q pendulum.
Phys Rev Lett
; 104(4): 040602, 2010 Jan 29.
Article
em En
| MEDLINE
| ID: mdl-20366696
We have achieved a direct measurement of the thermal fluctuation of a pendulum in an off-resonant and wide frequency region using a laser interferometric gravitational-wave detector. These measurements have been well identified for over one decade by an agreement with a theoretical prediction, which is derived by a fluctuation-dissipation theorem. Thermal fluctuation was dominated by the contribution of resistances in coil-magnet actuator circuits. When we tuned these resistances, the noise spectrum also changed according to a theoretical prediction. The measured thermal noise level corresponds to a high quality factor on the order of 10(5) of the pendulum.
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MEDLINE
Tipo de estudo:
Prognostic_studies
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En
Revista:
Phys Rev Lett
Ano de publicação:
2010
Tipo de documento:
Article