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Electronic fiber optic seal monitors

  • US 7,872,220 B1
  • Filed: 03/07/2005
  • Issued: 01/18/2011
  • Est. Priority Date: 03/05/2004
  • Status: Expired due to Fees
First Claim
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1. A method of sealing a container comprising:

  • connecting the fiber optic cable to the container,connecting a light source to a first end of the cable,connecting a photodetector to a second end of the cable,reading dark output of the photodetector,pulsing the light source,reading light output of the photodetector,storing the dark output and the light output in memory,comparing, at intervals, current dark output of the photodetector with stored dark output,pulsing the light source,comparing light output of the photodetector with stored light output of the photodetector, andreporting results of the comparing.

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