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Apparatus for monitoring housed turbine blading to obtain blading-to-housing distance

  • US 4,644,270 A
  • Filed: 03/06/1985
  • Issued: 02/17/1987
  • Est. Priority Date: 08/31/1982
  • Status: Expired due to Term
First Claim
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1. Apparatus for measuring the distance between a blade in a rotating row of blades and a reference position comprising:

  • (A) sensor means located at said reference position and operable to provide an output signal indicative of blade proximity;

    (B) said output signal including positive and negative peak portions as a result of the passage of said blade past said sensor;

    (C) means responsive to said output signal for obtaining an indication of the positive to negative peak-to-peak value of said output signal;

    (D) means responsive to said indication for obtaining a signal indicative of said peak-to-peak value; and

    (E) means responsive to said signal indicative of said peak-to-peak value for providing an indication of said distance.

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