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Measurement of the Q value of an acoustic resonator.

Authors
  • Biwa, Tetsushi
  • Ueda, Yuki
  • Nomura, Hiroshi
  • Mizutani, Uichiro
  • Yazaki, Taichi
Type
Published Article
Journal
Physical Review E
Publisher
American Physical Society (APS)
Publication Date
Aug 01, 2005
Volume
72
Issue
2 Pt 2
Pages
26601–26601
Identifiers
PMID: 16196729
Source
Medline
License
Unknown

Abstract

A cylindrical acoustic resonator was externally driven at the first resonance frequency by a compression driver. The acoustic energy stored in the resonator and the power dissipated per unit time were evaluated through the simultaneous measurements of acoustic pressure and velocity, in order to determine the Q value of the resonator. The resulting Q value, being employed as a measure of the damping in a resonator, was obtained as 36. However, the Q value determined from a frequency response curve known as a conventional technique turned out to be 25, which is 30% less than that obtained in the present method. By further applying these two methods in the case of a resonator having an acoustic load inside, we present an accurate measurement of the Q value of the resonator by making full use of its definition.

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