Patent ID: 6422063
Filing Date: 2002-07-23
Classification: G01N

Abstract:
A rapid flow-based method to experimentally measure permeability of a first gas in micro-perforated files comprising:providing a diffusion cell having first and second compartments separated by a test film having micro-perforations, each compartment having an inlet and an outlet for gas flushing; sweeping the test film with a measured flow of a first gas in said first compartment and with a measured flow of a second gas in said second compartment; maintaining equal localized pressures on both sides of the micro-perforations; determining a volume fraction of the first gas at the outlet of said second compartment; computing an experimental rapid-flow gas transmission rate of the first gas across the test film; and correlating the experimental rapid-flow gas transmission rate with a static gas transmission rate using a number of perforations to calculate a corrected gas transmission rate.