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Novelty detection

  • US 20090187381A1
  • Filed: 07/11/2008
  • Published: 07/23/2009
  • Est. Priority Date: 01/18/2008
  • Status: Active Grant
First Claim
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1. A method for detecting an abnormality in an apparatus or system including:

  • providing a data sample set comprising n values of a measured physical parameter associated with the apparatus or system generated by repeating a measurement of the physical parameter n times;

    selecting an extremal measured parameter value from amongst the data sample set;

    determining a probability of observing the selected parameter value by applying the selected parameter value to an extreme value probability distribution function having a location parameter and a scale parameter wherein the value of the location parameter and the value of the scale parameter are each constructed using an integer value m (e.g. notionally representing the size of a sub-sample data set comprising m of said measured parameter values) in which m is less than n (i.e. m<

    n);

    conditionally indicating that the selected parameter value is abnormal according to the value of said probability.

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