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29 March 2024
 
  » arxiv » 0908.3227

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Direct Measurement of Thermal Fluctuation of High-Q Pendulum
Kazuhiro Agatsuma ; Takashi Uchiyama ; Kazuhiro Yamamoto ; Masatake Ohashi ; Seiji Kawamura ; Shinji Miyoki ; Osamu Miyakawa ; Souichi Telada ; Kazuaki Kuroda ;
Date 23 Aug 2009
AbstractWe achieved for the first time a direct measurement of the thermal fluctuation of a pendulum in an off-resonant 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 was derived by a fluctuation-dissipation theorem. Thermal fluctuation is 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.
Source arXiv, 0908.3227
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