Thermal noise in mechanical experiments

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700 Scopus citations


The fluctuation-dissipation theorem is applied to the case of low-dissipation mechanical oscillators, whose losses are dominated by processes occurring inside the material of which the oscillators are made. In the common case of losses described by a complex spring constant with a constant imaginary part, the thermal noise displacement power spectrum is steeper by one power of than is predicted by a velocity-damping model. I construct models for the thermal noise spectra of systems with more than one mode of vibration, and evaluate a model of a specific design of pendulum suspension for the test masses in a gravitational-wave interferometer.

Original languageEnglish (US)
Pages (from-to)2437-2445
Number of pages9
JournalPhysical Review D
Issue number8
StatePublished - 1990

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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