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Shroud contact wear sensor in a turbo machine

  • US 5,440,395 A
  • Filed: 02/16/1994
  • Issued: 08/08/1995
  • Est. Priority Date: 02/17/1993
  • Status: Expired due to Fees
First Claim
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1. In a turbo machine having a shroud disposed on the inner surface of a casing as opposed to the tip of rotor blades, said shroud having a hole therein defined by a conical surface diverging from the inner towards the outer periphery of the shroud such that a hole is worn in a convergent end of the conical surface as an inner peripheral surface of the shroud wears, a shroud wear sensor comprising:

  • light-transmitting means for transmitting light from the outer periphery of said shroud toward said conical surface;

    light-receiving means for receiving the light from said light-transmitting means, that has been reflected from said conical surface;

    image processing means for determining the diameter of any opening in the convergent end of the conical surface on the basis of the quantity of the light received by said light-receiving means, andfor determining the amount that the shroud has worn at the inner peripheral surface of said shroud from the relation between the diameter of any initial opening in the distal end of the conical surface and the current diameter of the opening in the convergent end of said conical surface.

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