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Apparatus for sensing moving particles or small moving objects

  • US 4,149,415 A
  • Filed: 08/09/1976
  • Issued: 04/17/1979
  • Est. Priority Date: 08/09/1976
  • Status: Expired due to Term
First Claim
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1. Apparatus for sensing moving particles or small moving objects, comprising an elongated plate one side of which is a target for said objects, a relatively massive base, parallel, regularly spaced resilient strips interposed between the base and the other side of the plate and extending longitudinally thereof, the spacing of the strips being such that they coincide with nodes of a selected harmonic of transverse bending vibrations of the plate, and transducer means mounted on said other side of the plate between resilient strips.

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