| 摘要 |
A process for detecting a leak in a package is disclosed. The process comprises comparing a package by covering at least a portion of an oxygen ('O2')-sensitive product 12 with a multi-layer film 14 comprising i) A leak-indicator layer in which an O2-sensitive indicator is present throughout the leak-indicator layer and ii) An O2 barrier layer 16 outward of the leak indicator layer. A low O2 environment is provided within the package. The leak indicator layer is then illuminated with light containing a wavelength absorbed by the O2-sensitive indicator, so that the O2 sensitive indicator produces an emission of radiation in an amount inversely proportional to a level of O2 present with the O2-sensitive indicator. Then the multi-layer film is scanned while the O2-sensitive indicator is emitting radiation, the scanning being carried out by sensing and comparing the amount of radiation emitted from at least two different regions of the multi-layer film.
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