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Method and apparatus for measuring temperature using thermocouple

  • US 5,038,303 A
  • Filed: 12/28/1989
  • Issued: 08/06/1991
  • Est. Priority Date: 06/24/1988
  • Status: Expired due to Fees
First Claim
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1. A converter for converting thermo emf of a composite thermocouple into temperature of a material being tested, the composite thermocouple comprising:

  • a first thermocouple having cold junctions and having no compensating lead wires, and a second thermocouple having a known thermoelectromotive characteristic, the second thermocouple being an auxiliary thermocouple and compensates for the temperature of one of the cold junctions of the first thermocouple; and

    a means for independently setting a first interpolation equation and a second interpolation equation, the first interpolation equation being used to convert a thermo emf of the second thermocouple into a thermo emf of the first thermocouple, the second interpolation equation being used to convert a total thermo emf into temperature, the total thermo emf being a sum of the thermo emf of the first thermocouple and the converted thermo emf of the second thermocouple.

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