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Time lag approach for measuring thermal conductivity and specific heat

  • US 6,019,505 A
  • Filed: 12/31/1997
  • Issued: 02/01/2000
  • Est. Priority Date: 12/31/1997
  • Status: Expired due to Term
First Claim
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1. Apparatus for determining a selected property of a fluid of interest, comprising:

  • heater means in thermal communication with the fluid of interest, said heater means having a resistance that changes with temperature;

    heater energizing means connected to said heater means for energizing said heater means, said heater energizing means providing a transient elevated temperature condition in said heater means;

    sensor means in thermal communication with the fluid of interest and spaced from said heater means, said sensor means having a resistance that changes with temperature;

    first time lag means for determining a first time lag between the transient elevated temperature condition of said heater means and a transient elevated temperature response of said sensor means; and

    determining means for determining the selected property of the fluid of interest using the first time lag.

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