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METHODS OF DETECTING AN ABNORMAL OPERATION OF PROCESSING APPARATUS AND SYSTEMS THEREOF

  • US 20080002832A1
  • Filed: 09/06/2006
  • Published: 01/03/2008
  • Est. Priority Date: 06/29/2006
  • Status: Abandoned Application
First Claim
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1. A method for detecting abnormal operation of a manufacturing process, comprising the steps of:

  • (a) detecting at least one acoustic signal created from a processing apparatus;

    (b) transforming the acoustic signal into a frequency spectrum;

    (c) comparing the frequency spectrum with a pre-determined frequency spectrum, and(d) generating a signal indicating an abnormal operation of the processing apparatus, if an amplitude of at least one first frequency of the frequency spectrum is substantially different from an amplitude of the same frequency of the pre-determined frequency spectrum.

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