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Mechanical filter with acoustic sensing

  • US 4,373,396 A
  • Filed: 09/22/1980
  • Issued: 02/15/1983
  • Est. Priority Date: 09/22/1980
  • Status: Expired due to Term
First Claim
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1. A mechanical bandpass filter driven by a velocity source, comprising:

  • a first flexure mode cantilever bar resonator having a resonant frequency f1 and nodally connected to said velocity source, and having transducer means for generating an electrical output from flexural vibration;

    a second flexure mode cantilever bar resonator having a resonant frequency f2 and nodally connected to said velocity source, and having transducer means for generating an electrical output from flexural vibration;

    means coupling the electrical outputs of said transducer means to define a passband frequency range corresponding to the range between and around f2 and f1 due to increased amplitude of vibration, and to define a stopband by signal cancellation with increasing attenuation farther away from said passband; and

    impedance means RL connected across said electrical outputs of said transducer means for controlling the passband ripple of said mechanical bandpass filter.

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