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Estimation of thermal noise by a direct measurement of the mechanical conductance

✍ Scribed by Naoko Ohishi; Shigemi Otsuka; Keita Kawabe; Kimio Tsubono

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
153 KB
Volume
266
Category
Article
ISSN
0375-9601

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✦ Synopsis

We present a new method for estimating the thermal noise at off-resonant frequencies in a mechanical system. In this method, the mechanical conductance is directly measured at anti-resonant frequencies, and then the fluctuation-dissipation theorem is applied to the measured conductance in order to evaluate the thermal noise. To confirm the validity of this method, we demonstrated a direct measurement of the mechanical conductance of a 2-mode oscillator at an anti-resonant frequency. The measured conductance was in good agreement with the value calculated by the normal-mode expansion.

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