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Temperature measuring pyrometer probe which compensates for radiation heat transfer and pneumatic losses

  • US 5,116,137 A
  • Filed: 03/29/1990
  • Issued: 05/26/1992
  • Est. Priority Date: 03/29/1990
  • Status: Expired due to Fees
First Claim
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1. A temperature measuring pyrometer probe comprising:

  • an inner hollow body defining an inner chamber, said inner hollow body having an open end, said inner chamber in communication with ambient gas surrounding the pyrometer probe at said open end, said inner hollow body mounted within an outer hollow body forming cooling channel means for cooling said inner hollow body;

    a converging-diverging nozzle secured to an inner chamber wall of said inner hollow body, said converging-diverging nozzle positioned to direct said ambient gas into said inner chamber toward a thermocouple junction of a thermocouple, said converging-diverging nozzle having a wall suction channel for drawing a boundary layer of an ambient gas flow away from said thermocouple junction;

    suction inlet means for admitting said ambient gas surrounding the pyrometer probe into said converging-diverging nozzle and drawing said ambient gas flow through said inner chamber and said wall suction channel;

    positioner means for mounting said thermocouple junction in a centered position within a throat of said converging-diverging nozzle downstream, with respect to said ambient gas flow, from said wall suction channel;

    gas cooling means for pulsing reverse cooling gas flow through said converging-diverging nozzle, computing means for controlling said reverse cooling gas flow;

    said computing means continuously alternating said cooling gas flow and said ambient gas flow through said inner chamber;

    said thermocouple junction electrically coupled to said computing means; and

    said computing means calculating radiation heat transfer losses and pneumatic cooling and determining an instantaneous gas temperature.

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