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Rugged quick-response thermocouple for use in evaluating gas generants and gas generators

  • US 5,427,452 A
  • Filed: 01/10/1994
  • Issued: 06/27/1995
  • Est. Priority Date: 01/10/1994
  • Status: Expired due to Fees
First Claim
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1. A thermocouple for use in measuring the temperature of a gas flow, comprising:

  • a first wire formed of a first metal;

    a second wire formed of a second metal different from said first metal, said second wire electrically joined to said first wire at an exposed twist-welded junction, each of said wires having a diameter near said junction no greater than about ten thousandths of an inch, each of said wires coated with an electrical insulator, said junction being free of said electrical insulator; and

    an electrically insulating sheath substantially surrounding said wires adjacent said junction for maintaining said wires in separation from one another except at said junction, each of said insulators of said wires being positioned against an end of said sheath thereby creating a gap between said junction and said end of said sheath having a width substantially equal to the width of said insulator;

    wherein said junction is configured and positioned relative to said sheath to withstand placement within the gas flow for at least fifty milliseconds while the gas flow has a temperature of at least 300 degrees Kelvin and exerts a pressure against said junction of up to about five pounds per square inch.

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