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Monitoring system and method

  • US 6,819,254 B2
  • Filed: 04/03/2001
  • Issued: 11/16/2004
  • Est. Priority Date: 03/05/1999
  • Status: Expired due to Term
First Claim
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1. A monitoring system comprising a first, piezoelectric device which is subject to a force to be monitored, and a second device for determining the first device'"'"'s output and for correlating the first device'"'"'s output with the force, the second device including a sweep signal generator for causing a sweeping signal to be applied to the first device and an impedance determining circuit for causing the impedance of the first device to the applied swept signal to be determined.

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