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High temperature optical probe

  • US 5,366,290 A
  • Filed: 06/02/1993
  • Issued: 11/22/1994
  • Est. Priority Date: 10/17/1990
  • Status: Expired due to Fees
First Claim
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1. An optical probe for a gas temperature sensor for sensing the temperature of a high-temperature, high-velocity gas stream, comprising:

  • (A) a generally conical hollow tip for insertion into the gas stream formed of a ceramic selected from the group consisting of silicon carbide and silicon nitride to emit electromagnetic radiation at the high temperatures to be sensed, said tip defining a longitudinally-extending tip sidewall;

    (B) support means for mounting said tip for interaction with the high-temperature, high-velocity gas stream;

    (C) a joint physically interconnecting and spacing apart said support means and said tip, said joint being of a material and geometry to accommodate the thermal stresses caused by differences in thermal coefficients of expansion between said tip, said joint and said support means and the mechanical stresses caused by the interaction of said probe and the gas stream during high velocity movement of the gas stream past said tip, thereby to enable said probe to withstand said stresses said joint being welded to said support means and defining a longitudinally-extending joint sidewall having a portion thereof with a thickness of about 0.008-0.012 inch overlapping and supporting a longitudinally-extending portion of said tip sidewall; and

    (D) optical means, disposed in said tip and responsive to the temperature of the gas stream proximate said tip, for focusing and transmitting electromagnetic radiation emitted from said tip in response to the temperature of the gas stream proximate said tip in order to effect a measurement of the temperature of the gas stream.

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