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Method and apparatus for improving the performance of an aperture monitoring system

  • US 6,157,024 A
  • Filed: 06/03/1999
  • Issued: 12/05/2000
  • Est. Priority Date: 06/03/1999
  • Status: Expired due to Term
First Claim
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1. A method of improving the performance of a monitoring system associated with an aperture, said monitoring system comprising an emitter for emitting radiation adjacent said aperture and a receiver for receiving reflected radiation, said method comprising the steps of:

  • applying a material to a surface adjacent said aperture for altering the intensity of said emitted radiation as reflected from said surface, said material covering at least a portion of said surface;

    emitting said radiation adjacent said aperture by said emitter;

    receiving, by said receiver, at least a portion of said reflected radiation from said material; and

    comparing, by said monitoring system, said received radiation to a threshold value.

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