High-frequency parasitic modes of superconducting gravimeters

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書誌事項

公開日
2008-08-06
権利情報
  • http://www.springer.com/tdm
DOI
  • 10.1007/s00190-008-0253-6
公開者
Springer Science and Business Media LLC

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説明

The superconducting gravimeter (SG) has a long-period instrumental noise called the parasitic mode at periods around 100 s, whose precise mechanism has not yet been identified. In this paper, another instrumental noise is detected at much higher frequencies by analyzing the high-rate gravity channel of two SGs in Japan. This is also a parasitic oscillation, characterized by frequencies on the order of 1 Hz and very high Q values. Detailed spectra indicate that the noise actually consists of two modes with small frequency separations. Based on a simple theory on the rotational motions of the superconducting sphere in the gravity sensor, the observed modes are tentatively identified as rotational oscillations of the sphere about two orthogonal axes in the horizontal plane. Interactions between the parasitic modes are investigated using the spectra acquired on an earthquake, to conclude that the low-frequency parasitic mode is likely to be a rotational motion of the sphere about the vertical axis.

収録刊行物

  • Journal of Geodesy

    Journal of Geodesy 83 (5), 455-467, 2008-08-06

    Springer Science and Business Media LLC

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