SYSTEMS AND METHODS FOR PERMEATION RATE TESTING OF BARRIER FILMS USING VAPOR ACCUMULATION

摘要

The present invention is directed to systems and methods which utilize a cavity ringdown spectroscopy (CRDS) technique for measuring vapor transmission rate through a barrier film by first allowing the vapor to accumulate over a period of time after a steady state condition has been achieved. In this manner, in one embodiment, water permeation through a plastic film, even at very low permeability rates, can be accumulated over time. The accumulated water vapor is then measured and a calculation made as to permeation per unit of time. One main advantage of the accumulated method is that minimum vapor detection is limited only by the ability to produce a good seal around the edges of the plastic film in the sample cell.