Novelty detection

Details Novelty detection Novelty detection

2011-04-12

2011-04-12

Raymond, Edward (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system

Statistical measurement

Reexamination Certificate

active

07925470

ABSTRACT:
A method and apparatus for detecting an abnormality in e.g. in operating characteristics or function of a machine, apparatus or system, the method 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. An extremal measured parameter value is selected from amongst the data sample set, determining a probability of observing the selected parameter value (e.g. of observing a value not exceeding 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. 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). A conditional indication is given that the selected parameter value is abnormal according to the value of the probability.

REFERENCES:
patent: 7415390 (2008-08-01), Radulovic et al.
patent: 2006/0074598 (2006-04-01), Emigholz et al.
patent: 2007/0203653 (2007-08-01), Ben-Dor et al.

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