Patent ID: 8479563
Filing Date: 2013-07-09
Classification: G01N

Abstract:
1. A method for measuring the permeance of a material, the method comprising: (a) determining the correlation between flow rate and a pressure drop from a feed point to a collection point in a permeance test apparatus; (b) exposing a test area of a test sample having a strain profile to a second fluid at a second fluid pressure and a second fluid source concentration for a period of time sufficient to establish a steady state rate of permeation of the second fluid through the test sample; (c) flowing a first fluid at a first pressure at the feed point over the surface area opposed to the test area of the test sample at a pressure differential across the test area of the material test sample; (d) combining the second fluid that has permeated through the test sample with the first fluid that flowed over the surface area opposed to the test area of the test sample to form an output mixture; (e) measuring the pressure drop from the first pressure to the second pressure and using the correlation between pressure drop and flow rate to determine the flow rate over the surface area opposed to the test area of the test sample of the second fluid in the output mixture; (f) measuring the output concentration of the second fluid in the output mixture and calculating the permeance of the material test sample using the flow rate, the source concentration of the second fluid, the output concentration of the second fluid in the output mixture, and the second fluid source pressure.