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Method and apparatus for measuring relative hydration of a substrate

  • US 6,370,426 B1
  • Filed: 04/20/2000
  • Issued: 04/09/2002
  • Est. Priority Date: 04/20/1999
  • Status: Expired due to Term
First Claim
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1. A system for measuring the relative hydration of a substrate comprising:

  • A) a probe having first and second electrodes for contacting the substrate at a site for which a measurement is desired, B) an electrical impedance measurement circuit for periodically generating a value representing substrate impedance between the first and second electrodes, C) an environmental factor measurement circuit for periodically generating a value representing a substrate environmental factor associated with the impedance measurement, and D) a substrate hydration calculator for combining the impedance and environmental factor signals to generate an output representing the relative hydration of the substrate.

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