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Thermal conductivity measuring device

  • US 5,756,878 A
  • Filed: 01/16/1996
  • Issued: 05/26/1998
  • Est. Priority Date: 01/24/1995
  • Status: Expired due to Fees
First Claim
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1. A device for measuring the thermal conductivity of a sample gas, comprising:

  • a diaphragm formed on a base;

    a thermal conductivity sensor formed on said diaphragm and coupled to said sample gas so that heat generated by said thermal conductivity sensor is transferred between said thermal conductivity sensor and said sample gas;

    temperature measuring means, disposed on said base near said thermal conductivity sensor, for measuring an ambient temperature around said base, said temperature measuring means being thermally insulated from said thermal conductivity sensor;

    means for supplying electrical energy to said thermal conductivity sensor;

    means for controlling the electrical energy supplied to said thermal conductivity sensor so that a temperature difference between the temperature of said thermal conductivity sensor and said ambient temperature measured by said temperature measuring means is a constant, predetermined value;

    thermal conductivity calculating means for calculating a thermal conductivity of the sample gas on the basis of the electrical energy supplied to said thermal conductivity sensor to achieve said temperature difference of said constant predetermined value.

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