Apparatus And Method For Non-Intrusive Assessment Of Gas In Packages

摘要

A method and apparatus are disclosed for assessment of a sealed package. Light is emitted from a narrow-band laser source towards said package from outside of said package. An absorption signal of said light scattered in said package is measured, wherein said absorption is caused by said at least one gas when said light is scattered and travels in said sealed package. Measuring is made outside of said package, whereby said assessment is non-intrusive with regard to said package. It is determined if a deviation exists from a predetermined, expected gas composition and/or concentration of said at least one gas within said sealed package based on said measured absorption signal. Thus sealing of said package for said gas is detected.

主权项

1. An apparatus for assessment of a gas composition in a sealed packaging, comprising:
at least one narrow-band laser source for emission of laser light and is shifted between an absorptive wavelength of at least one gas in said gas composition to a non-absorptive wavelength, said laser source being arrangeable so as to direct said laser light towards said sealed package; at least one detector for detecting a periodic gas pressure wave signal generated from said periodically shifting between said absorptive wavelength to said non-absorptive wavelength, said detector is arrangeable outside said sealed packaging; a control unit for calculating a concentration of said at least one gas in said gas composition based on said detected periodic gas pressure wave signal.