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Accurate measurements of water vapor transmission through high-performance barrier layers
P J Brewer1, B A Goody, Y Kumar
1National Physical Laboratory, Analytical Science Division, Hampton Road, Teddington, Middlesex, TW11 0LW, United Kingdom. paul.brewer@npl.co.uk
Abstract:
We report a new approach to measuring very low rates of water vapor transmission through high-performance barrier layers, based on detection of the water vapor by cavity ring-down infrared spectroscopy. It provides accurate and traceable measurements with a detection limit for water vapor transmission significantly below 1 × 10(-4) g/m(2)/day. The system is underpinned by dynamic reference standards of water vapor generated between 5 and 2000 nmol∕mol with an estimated relative expanded uncertainty of ±2%. It has been compared with other methods and demonstrates good comparability.
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