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Method of detection of flow duct obstruction

  • US 6,684,702 B2
  • Filed: 03/28/2002
  • Issued: 02/03/2004
  • Est. Priority Date: 03/25/2002
  • Status: Expired due to Fees
First Claim
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1. A method for detecting an obstruction in a flow duct comprising:

  • directing gas through at least one port of said flow duct to cause flow of said gas through said at least one port;

    measuring a flow noise level of said flow of said gas through said at least one port;

    comparing said noise level with a predetermined noise level; and

    detecting when said flow noise level exceeds said predetermined noise level by at least a threshold amount, then indicating the presence of an obstruction in said at least one port.

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