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arXiv 0908.3227gr-qc
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高Q摆热涨落的直接测量

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

摘要:

利用激光干涉引力波探测器首次实现了单摆在非共振区热涨落的直接测量。这些测量已经很好地确定了十多年的协议与理论预测,这是由波动耗散定理。热波动主要由线圈-磁体致动器电路中的电阻的贡献决定。当我们调整这些电阻时,噪声频谱也根据理论预测而改变。测得的热噪声水平对应于摆锤的高品质因数,其量级为10^5。

英文摘要:

We 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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