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Tuned ground motion detector utilizing principles of mechanical resonance

  • US 3,990,039 A
  • Filed: 04/07/1975
  • Issued: 11/02/1976
  • Est. Priority Date: 04/07/1975
  • Status: Expired due to Term
First Claim
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1. A tuned resonant ground motion sensor comprising:

  • a. housing means;

    b. oscillatory mass means mounted in said housing for harmonic movement from a neutral position to a signaling position in response to applied vibrational forces falling within a predetermined frequency range; and

    c. viscous damping means contained in said housing for impeding the natural harmonic motion of said mass means to broaden the range of frequencies to which said mass means responds, said viscous damping means comprising a viscous fluid in which said mass means is partially immersed, and wherein at least a portion of said mass means confronts a conforming surface of said housing across a narrow gap, said gap being completely occupied by said fluid.

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